GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/util/posix.cc
Date: 2026-05-24 02:35:55
Exec Total Coverage
Lines: 908 1160 78.3%
Branches: 673 1265 53.2%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 *
4 * Some common functions.
5 */
6
7 #include <cctype>
8 #include <stdlib.h>
9 #include <cstdlib>
10 #include <dirent.h>
11 #include <sys/file.h>
12 #include <string.h>
13 #include <stdio.h>
14 #include <sched.h>
15 #include <sys/select.h>
16 #include <sys/uio.h>
17
18 #include "posix.h"
19
20 #include <arpa/inet.h>
21 #include <errno.h>
22 #include <fcntl.h>
23 #include <grp.h>
24 #include <inttypes.h>
25 #include <netinet/in.h>
26 #include <pthread.h>
27 #include <pwd.h>
28 #include <signal.h>
29 #include <stdint.h>
30 #include <sys/resource.h>
31 #include <sys/socket.h>
32 #include <sys/stat.h>
33 #ifdef __APPLE__
34 #include <sys/mount.h> // for statfs()
35 #else
36 #include <sys/statfs.h>
37 #endif
38 #include <sys/time.h>
39 #include <sys/types.h>
40 #include <sys/un.h>
41 #include <sys/utsname.h>
42 #include <sys/wait.h>
43 #include <unistd.h>
44 // If valgrind headers are present on the build system, then we can detect
45 // valgrind at runtime.
46 #ifdef HAS_VALGRIND_HEADERS
47 #include <valgrind/valgrind.h>
48 #endif
49
50 #include <algorithm>
51 #include <cassert>
52 #include <cstdio>
53 #include <cstring>
54 #include <map>
55 #include <set>
56 #include <string>
57 #include <vector>
58
59 #include "util/algorithm.h"
60 #include "util/capabilities.h"
61 #include "util/exception.h"
62 #include "util/fs_traversal.h"
63 #include "util/logging.h"
64 #include "util/pipe.h"
65 #include "util/string.h"
66 #include "util/smalloc.h"
67 #include "util/smalloc.h"
68 #include "util/smalloc.h"
69 #include "util/mutex.h"
70 #include "util/mutex.h"
71 #include "util/mutex.h"
72
73 // using namespace std; // NOLINT
74
75 #ifndef ST_RDONLY
76 // On Linux, this is in sys/statvfs.h
77 // On macOS, this flag is called MNT_RDONLY /usr/include/sys/mount.h
78 #define ST_RDONLY 1
79 #endif
80
81 // Older Linux glibc versions do not provide the f_flags member in struct statfs
82 #define CVMFS_HAS_STATFS_F_FLAGS
83 #ifndef __APPLE__
84 #ifdef __GLIBC_MINOR__
85 #if __GLIBC_MINOR__ < 12
86 #undef CVMFS_HAS_STATFS_F_FLAGS
87 #endif
88 #endif
89 #endif
90
91 // Work around missing clearenv()
92 #ifdef __APPLE__
93 extern "C" {
94 extern char **environ;
95 }
96 #endif
97
98 #ifdef CVMFS_NAMESPACE_GUARD
99 namespace CVMFS_NAMESPACE_GUARD {
100 #endif
101
102 static pthread_mutex_t getumask_mutex = PTHREAD_MUTEX_INITIALIZER;
103
104
105 /**
106 * Removes a trailing "/" from a path.
107 */
108 7322 std::string MakeCanonicalPath(const std::string &path) {
109
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 7322 if (path.length() == 0)
110 33 return path;
111
112
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 7289 if (path[path.length() - 1] == '/') {
113 67 return path.substr(0, path.length() - 1);
114 } else {
115 7222 return path;
116 }
117 }
118
119 /**
120 * Return both the file and directory name for a given path.
121 *
122 * NOTE: If only a filename is given, the directory is returned as "."
123 */
124 390 void SplitPath(const std::string &path,
125 std::string *dirname,
126 std::string *filename) {
127 390 const size_t dir_sep = path.rfind('/');
128
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 390 if (dir_sep != std::string::npos) {
129 298 *dirname = path.substr(0, dir_sep);
130 298 *filename = path.substr(dir_sep + 1);
131 } else {
132 92 *dirname = ".";
133 92 *filename = path;
134 }
135 390 }
136
137
138 /**
139 * Gets the directory part of a path.
140 */
141 12704 std::string GetParentPath(const std::string &path) {
142 12704 const std::string::size_type idx = path.find_last_of('/');
143
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 12704 if (idx != std::string::npos) {
144 12496 return path.substr(0, idx);
145 } else {
146
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 208 return "";
147 }
148 }
149
150
151 /**
152 * Gets the file name part of a path.
153 */
154 214033 std::string GetFileName(const std::string &path) {
155 214033 const std::string::size_type idx = path.find_last_of('/');
156
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 214033 if (idx != std::string::npos) {
157 213275 return path.substr(idx + 1);
158 } else {
159 758 return path;
160 }
161 }
162
163
164 325 bool IsAbsolutePath(const std::string &path) {
165
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 325 return (!path.empty() && path[0] == '/');
166 }
167
168
169 181 std::string GetAbsolutePath(const std::string &path) {
170
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 181 if (IsAbsolutePath(path))
171 34 return path;
172
173
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 294 return GetCurrentWorkingDirectory() + "/" + path;
174 }
175
176
177 1617 bool IsHttpUrl(const std::string &path) {
178
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 1617 if (path.length() < 7) {
179 88 return false;
180 }
181
182
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 1529 std::string prefix = path.substr(0, 8);
183 1529 std::transform(prefix.begin(), prefix.end(), prefix.begin(), ::tolower);
184
185
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 1529 return prefix.substr(0, 7) == "http://" || prefix == "https://";
186 1529 }
187
188
189 3265 FileSystemInfo GetFileSystemInfo(const std::string &path) {
190 3265 FileSystemInfo result;
191
192 struct statfs info;
193 3265 const int retval = statfs(path.c_str(), &info);
194
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 3265 if (retval != 0)
195 138 return result;
196
197
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 3127 switch (info.f_type) {
198 ✗ case kFsTypeAutofs:
199 ✗ result.type = kFsTypeAutofs;
200 ✗ break;
201 ✗ case kFsTypeNFS:
202 ✗ result.type = kFsTypeNFS;
203 ✗ break;
204 38 case kFsTypeProc:
205 38 result.type = kFsTypeProc;
206 38 break;
207 ✗ case kFsTypeBeeGFS:
208 ✗ result.type = kFsTypeBeeGFS;
209 ✗ break;
210 20 case kFsTypeTmpfs:
211 20 result.type = kFsTypeTmpfs;
212 20 break;
213 3069 default:
214 3069 result.type = kFsTypeUnknown;
215 }
216
217 #ifdef CVMFS_HAS_STATFS_F_FLAGS
218
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 3127 if (info.f_flags & ST_RDONLY)
219 ✗ result.is_rdonly = true;
220 #else
221 // On old Linux systems, fall back to access()
222 retval = access(path.c_str(), W_OK);
223 result.is_rdonly = (retval != 0);
224 #endif
225
226
227 3127 return result;
228 }
229
230
231 1500 std::string ReadSymlink(const std::string &path) {
232 // TODO(jblomer): avoid PATH_MAX
233 char buf[PATH_MAX + 1];
234 1500 const ssize_t nchars = readlink(path.c_str(), buf, PATH_MAX);
235
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 1500 if (nchars >= 0) {
236 1410 buf[nchars] = '\0';
237
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 1410 return std::string(buf);
238 }
239
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 90 return "";
240 }
241
242
243 /**
244 * Follow all symlinks if possible. Equivalent to
245 * `readlink --canonicalize-missing`
246 */
247 725 std::string ResolvePath(const std::string &path) {
248
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 725 if (path.empty() || (path == "/"))
249
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 254 return "/";
250
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 471 const std::string name = GetFileName(path);
251
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 471 std::string result = name;
252
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 471 if (name != path) {
253 // There is a parent path of 'path'
254
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 409 const std::string parent = ResolvePath(GetParentPath(path));
255
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 409 result = parent + (parent == "/" ? "" : "/") + name;
256 409 }
257 471 char *real_result = realpath(result.c_str(), NULL);
258
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 471 if (real_result) {
259
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 248 result = real_result;
260 248 free(real_result);
261 }
262
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 471 if (SymlinkExists(result)) {
263 char buf[PATH_MAX + 1];
264 31 const ssize_t nchars = readlink(result.c_str(), buf, PATH_MAX);
265
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 31 if (nchars >= 0) {
266 31 buf[nchars] = '\0';
267
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 31 result = buf;
268 }
269 }
270 471 return result;
271 471 }
272
273
274 99 bool IsMountPoint(const std::string &path) {
275
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 99 std::vector<std::string> mount_list = platform_mountlist();
276
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 99 const std::string resolved_path = ResolvePath(path);
277
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 8151 for (unsigned i = 0; i < mount_list.size(); ++i) {
278
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 8118 if (mount_list[i] == resolved_path)
279 66 return true;
280 }
281 33 return false;
282 99 }
283
284
285 /**
286 * By default PANIC(NULL) on failure
287 */
288 1875 void CreateFile(const std::string &path,
289 const int mode,
290 const bool ignore_failure) {
291 1875 const int fd = open(path.c_str(), O_CREAT, mode);
292
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 1875 if (fd >= 0) {
293 1842 close(fd);
294 1842 return;
295 }
296
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 33 if (ignore_failure)
297 ✗ return;
298 33 PANIC(NULL);
299 }
300
301
302 /**
303 * Symlinks /tmp/cvmfs.XYZ/l --> ParentPath(path) to make it shorter
304 */
305 215 static std::string MakeShortSocketLink(const std::string &path) {
306 struct sockaddr_un sock_addr;
307 215 const unsigned max_length = sizeof(sock_addr.sun_path);
308
309 215 std::string result;
310
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 430 const std::string tmp_path = CreateTempDir("/tmp/cvmfs");
311
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 215 if (tmp_path.empty())
312 ✗ return "";
313
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 215 const std::string link = tmp_path + "/l";
314
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 215 result = link + "/" + GetFileName(path);
315
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 215 if (result.length() >= max_length) {
316 86 rmdir(tmp_path.c_str());
317
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 86 return "";
318 }
319
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 129 const int retval = symlink(GetParentPath(path).c_str(), link.c_str());
320
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 129 if (retval != 0) {
321 ✗ rmdir(tmp_path.c_str());
322 ✗ return "";
323 }
324 129 return result;
325 215 }
326
327 129 static void RemoveShortSocketLink(const std::string &short_path) {
328
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 129 const std::string link = GetParentPath(short_path);
329 129 unlink(link.c_str());
330
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 129 rmdir(GetParentPath(link).c_str());
331 129 }
332
333
334 /**
335 * Creates and binds to a named socket.
336 */
337 2004 int MakeSocket(const std::string &path, const int mode) {
338
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 2004 std::string short_path(path);
339 struct sockaddr_un sock_addr;
340
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 2004 if (path.length() >= sizeof(sock_addr.sun_path)) {
341 // Socket paths are limited to 108 bytes (on some systems to 92 bytes),
342 // try working around
343
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 129 short_path = MakeShortSocketLink(path);
344
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 129 if (short_path.empty())
345 43 return -1;
346 }
347 1961 sock_addr.sun_family = AF_UNIX;
348 1961 strncpy(sock_addr.sun_path, short_path.c_str(), sizeof(sock_addr.sun_path));
349
350 1961 const int socket_fd = socket(AF_UNIX, SOCK_STREAM, 0);
351
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 1961 assert(socket_fd != -1);
352
353 #ifndef __APPLE__
354 // fchmod on a socket is not allowed under Mac OS X
355 // using default 0770 here
356
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 1961 if (fchmod(socket_fd, mode) != 0)
357 ✗ goto make_socket_failure;
358 #endif
359
360 1961 if (bind(socket_fd, reinterpret_cast<struct sockaddr *>(&sock_addr),
361 sizeof(sock_addr.sun_family) + sizeof(sock_addr.sun_path))
362
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 1961 < 0) {
363
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 43 if ((errno == EADDRINUSE) && (unlink(path.c_str()) == 0)) {
364 // Second try, perhaps the file was left over
365 43 if (bind(socket_fd, reinterpret_cast<struct sockaddr *>(&sock_addr),
366 sizeof(sock_addr.sun_family) + sizeof(sock_addr.sun_path))
367
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 43 < 0) {
368 ✗ LogCvmfs(kLogCvmfs, kLogDebug, "binding socket failed (%d)", errno);
369 ✗ goto make_socket_failure;
370 }
371 } else {
372 ✗ LogCvmfs(kLogCvmfs, kLogDebug, "binding socket failed (%d)", errno);
373 ✗ goto make_socket_failure;
374 }
375 }
376
377
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 1961 if (short_path != path)
378
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 86 RemoveShortSocketLink(short_path);
379
380 1961 return socket_fd;
381
382 ✗ make_socket_failure:
383 ✗ close(socket_fd);
384 ✗ if (short_path != path)
385 ✗ RemoveShortSocketLink(short_path);
386 ✗ return -1;
387 2004 }
388
389
390 /**
391 * Creates and binds a TCP/IPv4 socket. An empty address binds to the "any"
392 * address.
393 */
394 575 int MakeTcpEndpoint(const std::string &ipv4_address, int portno) {
395 575 const int socket_fd = socket(AF_INET, SOCK_STREAM, 0);
396
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 575 assert(socket_fd != -1);
397 575 const int on = 1;
398 575 int retval = setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
399
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 575 assert(retval == 0);
400
401 struct sockaddr_in endpoint_addr;
402 575 memset(&endpoint_addr, 0, sizeof(endpoint_addr));
403 575 endpoint_addr.sin_family = AF_INET;
404
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 575 if (ipv4_address.empty()) {
405 446 endpoint_addr.sin_addr.s_addr = INADDR_ANY;
406 } else {
407 129 retval = inet_aton(ipv4_address.c_str(), &(endpoint_addr.sin_addr));
408
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 129 if (retval == 0) {
409
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 43 LogCvmfs(kLogCvmfs, kLogDebug, "invalid IPv4 address");
410
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 43 close(socket_fd);
411 43 return -1;
412 }
413 }
414 532 endpoint_addr.sin_port = htons(portno);
415
416 532 retval = bind(socket_fd, reinterpret_cast<struct sockaddr *>(&endpoint_addr),
417 sizeof(endpoint_addr));
418
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 532 if (retval < 0) {
419
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 43 LogCvmfs(kLogCvmfs, kLogDebug, "binding TCP endpoint failed (%d)", errno);
420
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 43 close(socket_fd);
421 43 return -1;
422 }
423 489 return socket_fd;
424 }
425
426
427 /**
428 * Connects to a named socket.
429 *
430 * \return socket file descriptor on success, -1 else
431 */
432 726 int ConnectSocket(const std::string &path) {
433
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 726 std::string short_path(path);
434 struct sockaddr_un sock_addr;
435
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 726 if (path.length() >= sizeof(sock_addr.sun_path)) {
436 // Socket paths are limited to 108 bytes (on some systems to 92 bytes),
437 // try working around
438
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 86 short_path = MakeShortSocketLink(path);
439
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 86 if (short_path.empty())
440 43 return -1;
441 }
442 683 sock_addr.sun_family = AF_UNIX;
443 683 strncpy(sock_addr.sun_path, short_path.c_str(), sizeof(sock_addr.sun_path));
444
445 683 const int socket_fd = socket(AF_UNIX, SOCK_STREAM, 0);
446
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 683 assert(socket_fd != -1);
447
448
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 683 const int retval = connect(
449 socket_fd, reinterpret_cast<struct sockaddr *>(&sock_addr),
450 sizeof(sock_addr.sun_family) + sizeof(sock_addr.sun_path));
451
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 683 if (short_path != path)
452
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 43 RemoveShortSocketLink(short_path);
453
454
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 683 if (retval < 0) {
455
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 43 close(socket_fd);
456 43 return -1;
457 }
458
459 640 return socket_fd;
460 726 }
461
462
463 /**
464 * Connects to a (remote) TCP server
465 */
466 155 int ConnectTcpEndpoint(const std::string &ipv4_address, int portno) {
467 155 const int socket_fd = socket(AF_INET, SOCK_STREAM, 0);
468
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 155 assert(socket_fd != -1);
469
470 struct sockaddr_in endpoint_addr;
471 155 memset(&endpoint_addr, 0, sizeof(endpoint_addr));
472 155 endpoint_addr.sin_family = AF_INET;
473 155 int retval = inet_aton(ipv4_address.c_str(), &(endpoint_addr.sin_addr));
474
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 155 if (retval == 0) {
475
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 43 LogCvmfs(kLogCvmfs, kLogDebug, "invalid IPv4 address");
476
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 43 close(socket_fd);
477 43 return -1;
478 }
479 112 endpoint_addr.sin_port = htons(portno);
480
481
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 112 retval = connect(socket_fd,
482 reinterpret_cast<struct sockaddr *>(&endpoint_addr),
483 sizeof(endpoint_addr));
484
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 112 if (retval != 0) {
485 43 LogCvmfs(kLogCvmfs, kLogDebug, "failed to connect to TCP endpoint (%d)",
486
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 43 errno);
487
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 43 close(socket_fd);
488 43 return -1;
489 }
490 69 return socket_fd;
491 }
492
493
494 /**
495 * Creating a pipe should always succeed.
496 */
497 16121 void MakePipe(int pipe_fd[2]) {
498 16121 const int retval = pipe(pipe_fd);
499
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 16121 assert(retval == 0);
500 16121 }
501
502
503 /**
504 * Writes to a pipe should always succeed.
505 */
506 4971620 void WritePipe(int fd, const void *buf, size_t nbyte) {
507 ssize_t num_bytes;
508 do {
509 4971620 num_bytes = write(fd, buf, nbyte);
510
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 4971620 } while ((num_bytes < 0) && (errno == EINTR));
511
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 4971620 assert((num_bytes >= 0) && (static_cast<size_t>(num_bytes) == nbyte));
512 4971620 }
513
514
515 /**
516 * Reads from a pipe should always succeed.
517 */
518 143364119 void ReadPipe(int fd, void *buf, size_t nbyte) {
519 ssize_t num_bytes;
520 do {
521 143364119 num_bytes = read(fd, buf, nbyte);
522
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 143364119 } while ((num_bytes < 0) && (errno == EINTR));
523
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 143364119 assert((num_bytes >= 0) && (static_cast<size_t>(num_bytes) == nbyte));
524 143364119 }
525
526
527 /**
528 * Reads from a pipe where writer's end is not yet necessarily connected
529 */
530 1402025 bool ReadHalfPipe(int fd, void *buf, size_t nbyte, unsigned timeout_ms) {
531 ssize_t num_bytes;
532 1402025 unsigned i = 0;
533 1402025 unsigned backoff_ms = 1;
534 1402025 uint64_t duration_ms = 0;
535 1402025 uint64_t timestamp = 0;
536
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 1402025 if (timeout_ms != 0)
537 48 timestamp = platform_monotonic_time_ns();
538
539 1402025 const unsigned max_backoff_ms = 256;
540 do {
541 // When the writer is not connected, this takes ~200-300ns per call as per
542 // micro benchmarks
543 1402025 num_bytes = read(fd, buf, nbyte);
544
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 1402025 if ((num_bytes < 0) && (errno == EINTR))
545 ✗ continue;
546 1402025 i++;
547 // Start backing off when the busy loop reaches the ballpark of 1ms
548
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 1402025 if ((i > 3000) && (num_bytes == 0)) {
549 // The BackoffThrottle would pull in too many dependencies
550 ✗ SafeSleepMs(backoff_ms);
551 ✗ if (backoff_ms < max_backoff_ms)
552 ✗ backoff_ms *= 2;
553 }
554
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 1402025 if ((timeout_ms != 0) && (num_bytes == 0)) {
555 ✗ duration_ms = (platform_monotonic_time_ns() - timestamp)
556 / (1000UL * 1000UL);
557 ✗ if (duration_ms > timeout_ms)
558 ✗ return false;
559 }
560
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 1402025 } while (num_bytes == 0);
561
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 1402025 assert((num_bytes >= 0) && (static_cast<size_t>(num_bytes) == nbyte));
562 1402025 return true;
563 }
564
565
566 /**
567 * Closes both ends of a pipe
568 */
569 12738 void ClosePipe(int pipe_fd[2]) {
570 12738 close(pipe_fd[0]);
571 12738 close(pipe_fd[1]);
572 12738 }
573
574
575 /**
576 * Compares two directory trees on the meta-data level. Returns true iff the
577 * trees have identical content.
578 */
579 99169 bool DiffTree(const std::string &path_a, const std::string &path_b) {
580 int retval;
581 99169 std::vector<std::string> ls_a;
582 99169 std::vector<std::string> ls_b;
583 99169 std::vector<std::string> subdirs;
584
585
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 99169 DIR *dirp_a = opendir(path_a.c_str());
586
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 99169 if (dirp_a == NULL)
587 ✗ return false;
588
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 99169 DIR *dirp_b = opendir(path_b.c_str());
589
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 99169 if (dirp_b == NULL) {
590 ✗ closedir(dirp_a);
591 ✗ return false;
592 }
593
594 platform_dirent64 *dirent;
595
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 404085 while ((dirent = platform_readdir(dirp_a))) {
596
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 304916 const std::string name(dirent->d_name);
597
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 304916 if ((name == ".") || (name == ".."))
598 198338 continue;
599
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 106578 const std::string path = path_a + "/" + name;
600
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 106578 ls_a.push_back(path);
601
602 platform_stat64 info;
603 106578 retval = platform_lstat(path.c_str(), &info);
604
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 106578 if (retval != 0) {
605 ✗ closedir(dirp_a);
606 ✗ closedir(dirp_b);
607 ✗ return false;
608 }
609
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 106578 if (S_ISDIR(info.st_mode))
610
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 99882 subdirs.push_back(name);
611
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 304916 }
612
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 403806 while ((dirent = platform_readdir(dirp_b))) {
613
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 304637 const std::string name(dirent->d_name);
614
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 304637 if ((name == ".") || (name == ".."))
615 198338 continue;
616
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 106299 const std::string path = path_b + "/" + name;
617
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 106299 ls_b.push_back(path);
618
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 304637 }
619
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 99169 closedir(dirp_a);
620
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 99169 closedir(dirp_b);
621
622
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 99169 sort(ls_a.begin(), ls_a.end());
623
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 99169 sort(ls_b.begin(), ls_b.end());
624
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 99169 if (ls_a.size() != ls_b.size())
625 31 return false;
626
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 204786 for (unsigned i = 0; i < ls_a.size(); ++i) {
627
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 105648 if (GetFileName(ls_a[i]) != GetFileName(ls_b[i]))
628 ✗ return false;
629 platform_stat64 info_a;
630 platform_stat64 info_b;
631 105648 retval = platform_lstat(ls_a[i].c_str(), &info_a);
632
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 105648 if (retval != 0)
633 ✗ return false;
634 105648 retval = platform_lstat(ls_b[i].c_str(), &info_b);
635
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 105648 if (retval != 0)
636 ✗ return false;
637
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 105648 if ((info_a.st_mode != info_b.st_mode) || (info_a.st_uid != info_b.st_uid)
638
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 105648 || (info_a.st_gid != info_b.st_gid)
639
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 105648 || ((info_a.st_size != info_b.st_size) && !S_ISDIR(info_a.st_mode))) {
640 ✗ return false;
641 }
642 }
643
644
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 198214 for (unsigned i = 0; i < subdirs.size(); ++i) {
645
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 99076 const bool retval_subtree = DiffTree(path_a + "/" + subdirs[i],
646
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 198152 path_b + "/" + subdirs[i]);
647
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 99076 if (!retval_subtree)
648 ✗ return false;
649 }
650
651 99138 return true;
652 99169 }
653
654
655 /**
656 * Changes a non-blocking file descriptor to a blocking one.
657 */
658 100 void Nonblock2Block(int filedes) {
659 100 const int flags = fcntl(filedes, F_GETFL);
660
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 100 assert(flags != -1);
661 100 const int retval = fcntl(filedes, F_SETFL, flags & ~O_NONBLOCK);
662
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 100 assert(retval != -1);
663 100 }
664
665
666 /**
667 * Changes a blocking file descriptor to a non-blocking one.
668 */
669 99 void Block2Nonblock(int filedes) {
670 99 const int flags = fcntl(filedes, F_GETFL);
671
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 99 assert(flags != -1);
672 99 const int retval = fcntl(filedes, F_SETFL, flags | O_NONBLOCK);
673
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 99 assert(retval != -1);
674 99 }
675
676
677 /**
678 * Drops the characters of string to a socket. It doesn't matter
679 * if the other side has hung up.
680 */
681 172 void SendMsg2Socket(const int fd, const std::string &msg) {
682 172 (void)send(fd, &msg[0], msg.length(), MSG_NOSIGNAL);
683 172 }
684
685 /**
686 * Sends the file descriptor passing_fd to the socket socket_fd. Can be used
687 * to transfer an open file descriptor from one process to another. Use
688 * ConnectSocket() to get the socket_fd.
689 */
690 43 bool SendFd2Socket(int socket_fd, int passing_fd) {
691 union {
692 // Make sure that ctrl_msg is properly aligned.
693 struct cmsghdr align;
694 // Buffer large enough to store the file descriptor (ancillary data)
695 unsigned char buf[CMSG_SPACE(sizeof(int))];
696 } ctrl_msg;
697
698 43 memset(ctrl_msg.buf, 0, sizeof(ctrl_msg.buf));
699
700 struct msghdr msgh;
701 43 msgh.msg_name = NULL;
702 43 msgh.msg_namelen = 0;
703
704 43 unsigned char dummy = 0;
705 struct iovec iov;
706 43 iov.iov_base = &dummy;
707 43 iov.iov_len = 1;
708 43 msgh.msg_iov = &iov;
709 43 msgh.msg_iovlen = 1;
710
711 43 msgh.msg_control = ctrl_msg.buf;
712 43 msgh.msg_controllen = sizeof(ctrl_msg.buf);
713
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 43 struct cmsghdr *cmsgp = CMSG_FIRSTHDR(&msgh);
714 43 cmsgp->cmsg_len = CMSG_LEN(sizeof(int));
715 43 cmsgp->cmsg_level = SOL_SOCKET;
716 43 cmsgp->cmsg_type = SCM_RIGHTS;
717 43 memcpy(CMSG_DATA(cmsgp), &passing_fd, sizeof(int));
718
719
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 43 const ssize_t retval = sendmsg(socket_fd, &msgh, 0);
720 43 return (retval != -1);
721 }
722
723
724 /**
725 * Returns the file descriptor that has been sent with SendFd2Socket. The
726 * msg_fd file descriptor needs to come from a call to accept() on the socket
727 * where the passing file descriptor has been sent to.
728 * Returns -errno on error.
729 */
730 ✗ int RecvFdFromSocket(int msg_fd) {
731 union {
732 // Make sure that ctrl_msg is properly aligned.
733 struct cmsghdr align;
734 // Buffer large enough to store the file descriptor (ancillary data)
735 unsigned char buf[CMSG_SPACE(sizeof(int))];
736 } ctrl_msg;
737
738 ✗ memset(ctrl_msg.buf, 0, sizeof(ctrl_msg.buf));
739
740 struct msghdr msgh;
741 ✗ msgh.msg_name = NULL;
742 ✗ msgh.msg_namelen = 0;
743
744 unsigned char dummy;
745 struct iovec iov;
746 ✗ iov.iov_base = &dummy;
747 ✗ iov.iov_len = 1;
748 ✗ msgh.msg_iov = &iov;
749 ✗ msgh.msg_iovlen = 1;
750
751 ✗ msgh.msg_control = ctrl_msg.buf;
752 ✗ msgh.msg_controllen = sizeof(ctrl_msg.buf);
753
754 ✗ const ssize_t retval = recvmsg(msg_fd, &msgh, 0);
755 ✗ if (retval == -1)
756 ✗ return -errno;
757
758 ✗ struct cmsghdr *cmsgp = CMSG_FIRSTHDR(&msgh);
759 ✗ assert(cmsgp != NULL);
760 ✗ if (cmsgp->cmsg_len != CMSG_LEN(sizeof(int)))
761 ✗ return -ERANGE;
762 ✗ assert(cmsgp->cmsg_level == SOL_SOCKET);
763 ✗ assert(cmsgp->cmsg_type == SCM_RIGHTS);
764
765 int passing_fd;
766 ✗ memcpy(&passing_fd, CMSG_DATA(cmsgp), sizeof(int));
767 ✗ assert(passing_fd >= 0);
768 ✗ return passing_fd;
769 }
770
771
772 31 std::string GetHostname() {
773 char name[HOST_NAME_MAX + 1];
774 31 const int retval = gethostname(name, HOST_NAME_MAX);
775
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 31 assert(retval == 0);
776
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 31 return name;
777 }
778
779
780 /**
781 * set(e){g/u}id wrapper.
782 * If temporarily is true, reserve the ability to switch back.
783 *
784 * avoid_mutexes: if true, means that we are a forked child and must not use
785 * mutexes.
786 */
787 33 bool SwitchCredentials(const uid_t uid, const gid_t gid, const bool temporarily,
788 const bool avoid_mutexes) {
789
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 33 if (!avoid_mutexes) {
790 33 LogCvmfs(kLogCvmfs, kLogDebug,
791 "current credentials uid %d gid %d "
792 "euid %d egid %d, switching to %d %d (temp: %d)",
793 getuid(), getgid(), geteuid(), getegid(), uid, gid, temporarily);
794 }
795 33 int retval = 0;
796
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 33 if (temporarily) {
797 ✗ if (gid != getegid())
798 ✗ retval = setegid(gid);
799 ✗ if ((retval == 0) && (uid != geteuid()))
800 ✗ retval = seteuid(uid);
801 } else {
802 // If effective uid is not root, we probably need setuid+setgid
803 // capabilities first
804
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 33 if (geteuid() != 0) {
805 33 retval = ObtainSetuidgidCapabilities(avoid_mutexes);
806
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 33 if (!retval && !avoid_mutexes) {
807 33 LogCvmfs(kLogCvmfs, kLogDebug,
808 "unable to obtain setuid & setgid capabilities first");
809 }
810 // The setuid below will drop the capability again unless
811 // switching to root or keepcaps has been enabled.
812 }
813
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 33 retval = setgid(gid) || setuid(uid);
814 }
815
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 33 if (!avoid_mutexes) {
816 33 LogCvmfs(kLogCvmfs, kLogDebug, "switch credentials result %d (%d)", retval,
817 33 errno);
818 }
819 33 return retval == 0;
820 }
821
822
823 /**
824 * Checks if the regular file path exists.
825 */
826 39361 bool FileExists(const std::string &path) {
827 platform_stat64 info;
828
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 39361 return ((platform_lstat(path.c_str(), &info) == 0) && S_ISREG(info.st_mode));
829 }
830
831
832 /**
833 * Returns -1 on failure.
834 */
835 3755928 int64_t GetFileSize(const std::string &path) {
836 platform_stat64 info;
837 3755928 const int retval = platform_stat(path.c_str(), &info);
838
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 3763288 if (retval != 0)
839 3738250 return -1;
840 25038 return info.st_size;
841 }
842
843
844 /**
845 * Checks if the directory (not symlink) path exists.
846 */
847 11461 bool DirectoryExists(const std::string &path) {
848 platform_stat64 info;
849
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 11461 return ((platform_lstat(path.c_str(), &info) == 0) && S_ISDIR(info.st_mode));
850 }
851
852
853 /**
854 * Checks if the symlink file path exists.
855 */
856 1619 bool SymlinkExists(const std::string &path) {
857 platform_stat64 info;
858
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 1619 return ((platform_lstat(path.c_str(), &info) == 0) && S_ISLNK(info.st_mode));
859 }
860
861
862 /**
863 * Equivalent of `ln -sf $src $dest`
864 */
865 203 bool SymlinkForced(const std::string &src, const std::string &dest) {
866 203 int retval = unlink(dest.c_str());
867
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 203 if ((retval != 0) && (errno != ENOENT))
868 ✗ return false;
869 203 retval = symlink(src.c_str(), dest.c_str());
870 203 return retval == 0;
871 }
872
873
874 /**
875 * The mkdir -p command. Additionally checks if the directory is writable
876 * if it exists.
877 */
878 1040560 bool MkdirDeep(const std::string &path,
879 const mode_t mode,
880 bool verify_writable) {
881
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 1040560 if (path == "")
882 61 return false;
883
884 1040499 int retval = mkdir(path.c_str(), mode);
885
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 1040499 if (retval == 0)
886 1036795 return true;
887
888 7408 if ((errno == ENOENT)
889
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 3704 && (MkdirDeep(GetParentPath(path), mode, verify_writable))) {
890 2475 return MkdirDeep(path, mode, verify_writable);
891 }
892
893
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 1229 if (errno == EEXIST) {
894 platform_stat64 info;
895
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 1209 if ((platform_stat(path.c_str(), &info) == 0) && S_ISDIR(info.st_mode)) {
896
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 1174 if (verify_writable) {
897 93 retval = utimes(path.c_str(), NULL);
898
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 93 if (retval == 0)
899 1174 return true;
900 } else {
901 1081 return true;
902 }
903 }
904 }
905
906 55 return false;
907 }
908
909
910 /**
911 * Creates the "hash cache" directory structure in path.
912 */
913 4307 bool MakeCacheDirectories(const std::string &path, const mode_t mode) {
914
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 4307 const std::string canonical_path = MakeCanonicalPath(path);
915
916
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 4307 std::string this_path = canonical_path + "/quarantaine";
917
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 4307 if (!MkdirDeep(this_path, mode, false))
918 20 return false;
919
920
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 4287 this_path = canonical_path + "/ff";
921
922 platform_stat64 stat_info;
923
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 4287 if (platform_stat(this_path.c_str(), &stat_info) != 0) {
924
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 3743 this_path = canonical_path + "/txn";
925
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 3743 if (!MkdirDeep(this_path, mode, false))
926 ✗ return false;
927
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 961951 for (int i = 0; i <= 0xff; i++) {
928 char hex[4];
929 958208 snprintf(hex, sizeof(hex), "%02x", i);
930
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 958208 this_path = canonical_path + "/" + std::string(hex);
931
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 958208 if (!MkdirDeep(this_path, mode, false))
932 ✗ return false;
933 }
934 }
935 4287 return true;
936 4307 }
937
938
939 /**
940 * Tries to locks file path, return an error if file is already locked.
941 * Creates path if required.
942 *
943 * \return file descriptor, -1 on error, -2 if it would block
944 */
945 2625 int TryLockFile(const std::string &path) {
946 2625 const int fd_lockfile = open(path.c_str(), O_RDONLY | O_CREAT, 0600);
947
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 2625 if (fd_lockfile < 0)
948 38 return -1;
949
950
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 2587 if (flock(fd_lockfile, LOCK_EX | LOCK_NB) != 0) {
951 77 close(fd_lockfile);
952
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 77 if (errno != EWOULDBLOCK)
953 ✗ return -1;
954 77 return -2;
955 }
956
957 2510 return fd_lockfile;
958 }
959
960
961 /**
962 * Tries to write the process id in a /var/run/progname.pid like file. Returns
963 * the same as TryLockFile.
964 *
965 * \return file descriptor, -1 on error, -2 if it would block
966 */
967 192 int WritePidFile(const std::string &path) {
968
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 192 const int fd = open(path.c_str(), O_CREAT | O_RDWR, 0600);
969
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 192 if (fd < 0)
970 48 return -1;
971
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 144 if (flock(fd, LOCK_EX | LOCK_NB) != 0) {
972
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 48 close(fd);
973
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 48 if (errno != EWOULDBLOCK)
974 ✗ return -1;
975 48 return -2;
976 }
977
978 // Don't leak the file descriptor to exec'd children
979
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 96 int flags = fcntl(fd, F_GETFD);
980
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 96 assert(flags != -1);
981 96 flags |= FD_CLOEXEC;
982
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 96 flags = fcntl(fd, F_SETFD, flags);
983
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 96 assert(flags != -1);
984
985 char buf[64];
986
987 96 snprintf(buf, sizeof(buf), "%" PRId64 "\n", static_cast<uint64_t>(getpid()));
988 96 const bool retval = (ftruncate(fd, 0) == 0)
989
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 96 && SafeWrite(fd, buf, strlen(buf));
990
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 96 if (!retval) {
991 ✗ UnlockFile(fd);
992 ✗ return -1;
993 }
994 96 return fd;
995 }
996
997
998 /**
999 * Locks file path, blocks if file is already locked. Creates path if required.
1000 *
1001 * \return file descriptor, -1 on error
1002 */
1003 2004 int LockFile(const std::string &path) {
1004 2004 const int fd_lockfile = open(path.c_str(), O_RDONLY | O_CREAT, 0600);
1005
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 2004 if (fd_lockfile < 0)
1006 104 return -1;
1007
1008
1009
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 1900 if (flock(fd_lockfile, LOCK_EX | LOCK_NB) != 0) {
1010
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 38 if (errno != EWOULDBLOCK) {
1011 ✗ close(fd_lockfile);
1012 ✗ return -1;
1013 }
1014 38 LogCvmfs(kLogCvmfs, kLogSyslog, "another process holds %s, waiting.",
1015 path.c_str());
1016
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 38 if (flock(fd_lockfile, LOCK_EX) != 0) {
1017 ✗ close(fd_lockfile);
1018 ✗ return -1;
1019 }
1020 38 LogCvmfs(kLogCvmfs, kLogSyslog, "lock %s acquired", path.c_str());
1021 }
1022
1023 1900 return fd_lockfile;
1024 }
1025
1026
1027 4350 void UnlockFile(const int filedes) {
1028 4350 const int retval = flock(filedes, LOCK_UN);
1029
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 4350 assert(retval == 0);
1030 4350 close(filedes);
1031 4350 }
1032
1033
1034 /**
1035 * Wrapper around mkstemp.
1036 */
1037 22753 FILE *CreateTempFile(const std::string &path_prefix, const int mode,
1038 const char *open_flags, std::string *final_path) {
1039 22753 *final_path = path_prefix + ".XXXXXX";
1040 22753 char *tmp_file = strdupa(final_path->c_str());
1041 22753 const int tmp_fd = mkstemp(tmp_file);
1042
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 22753 if (tmp_fd < 0) {
1043 85 return NULL;
1044 }
1045
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 22668 if (fchmod(tmp_fd, mode) != 0) {
1046 ✗ close(tmp_fd);
1047 ✗ return NULL;
1048 }
1049
1050 22668 *final_path = tmp_file;
1051 22668 FILE *tmp_fp = fdopen(tmp_fd, open_flags);
1052
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 22668 if (!tmp_fp) {
1053 ✗ close(tmp_fd);
1054 ✗ unlink(tmp_file);
1055 ✗ return NULL;
1056 }
1057
1058 22668 return tmp_fp;
1059 }
1060
1061
1062 /**
1063 * Create the file but don't open. Use only in non-public tmp directories.
1064 */
1065 9865 std::string CreateTempPath(const std::string &path_prefix, const int mode) {
1066 9865 std::string result;
1067
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 9865 FILE *f = CreateTempFile(path_prefix, mode, "w", &result);
1068
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 9865 if (!f)
1069
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 42 return "";
1070
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 9823 fclose(f);
1071 9823 return result;
1072 9865 }
1073
1074
1075 /**
1076 * Create a directory with a unique name.
1077 */
1078 7214 std::string CreateTempDir(const std::string &path_prefix) {
1079
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 7214 const std::string dir = path_prefix + ".XXXXXX";
1080 7214 char *tmp_dir = strdupa(dir.c_str());
1081 7214 tmp_dir = mkdtemp(tmp_dir);
1082
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 7214 if (tmp_dir == NULL)
1083
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 35 return "";
1084
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 7179 return std::string(tmp_dir);
1085 7214 }
1086
1087
1088 /**
1089 * Get the current working directory of the running process
1090 */
1091 6763 std::string GetCurrentWorkingDirectory() {
1092 char cwd[PATH_MAX];
1093
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 6763 return (getcwd(cwd, sizeof(cwd)) != NULL) ? std::string(cwd) : std::string();
1094 }
1095
1096
1097 /**
1098 * Helper class that provides callback functions for the file system traversal.
1099 */
1100 class RemoveTreeHelper {
1101 public:
1102 bool success;
1103 10414 RemoveTreeHelper() { success = true; }
1104 34717 void RemoveFile(const std::string &parent_path, const std::string &name) {
1105
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 34717 const int retval = unlink((parent_path + "/" + name).c_str());
1106
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 34717 if (retval != 0)
1107 ✗ success = false;
1108 34717 }
1109 22447 void RemoveDir(const std::string &parent_path, const std::string &name) {
1110
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 22447 const int retval = rmdir((parent_path + "/" + name).c_str());
1111
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 22447 if (retval != 0)
1112 ✗ success = false;
1113 22447 }
1114 876347 bool TryRemoveDir(const std::string &parent_path, const std::string &name) {
1115
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 876347 const int retval = rmdir((parent_path + "/" + name).c_str());
1116 876347 return (retval != 0);
1117 }
1118 };
1119
1120
1121 /**
1122 * Does rm -rf on path.
1123 */
1124 11172 bool RemoveTree(const std::string &path) {
1125 platform_stat64 info;
1126 11172 const int retval = platform_lstat(path.c_str(), &info);
1127
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 11172 if (retval != 0)
1128 758 return errno == ENOENT;
1129
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 10414 if (!S_ISDIR(info.st_mode))
1130 ✗ return false;
1131
1132
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 10414 RemoveTreeHelper *remove_tree_helper = new RemoveTreeHelper();
1133
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 20828 FileSystemTraversal<RemoveTreeHelper> traversal(remove_tree_helper, "", true);
1134 10414 traversal.fn_new_file = &RemoveTreeHelper::RemoveFile;
1135 10414 traversal.fn_new_character_dev = &RemoveTreeHelper::RemoveFile;
1136 10414 traversal.fn_new_symlink = &RemoveTreeHelper::RemoveFile;
1137 10414 traversal.fn_new_socket = &RemoveTreeHelper::RemoveFile;
1138 10414 traversal.fn_new_fifo = &RemoveTreeHelper::RemoveFile;
1139 10414 traversal.fn_leave_dir = &RemoveTreeHelper::RemoveDir;
1140 10414 traversal.fn_new_dir_prefix = &RemoveTreeHelper::TryRemoveDir;
1141
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 10414 traversal.Recurse(path);
1142 10414 const bool result = remove_tree_helper->success;
1143
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 10414 delete remove_tree_helper;
1144
1145 10414 return result;
1146 10414 }
1147
1148
1149 /**
1150 * Returns ls $dir/GLOB$suffix
1151 */
1152 397 std::vector<std::string> FindFilesBySuffix(const std::string &dir,
1153 const std::string &suffix) {
1154 397 std::vector<std::string> result;
1155
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 397 DIR *dirp = opendir(dir.c_str());
1156
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 397 if (!dirp)
1157 243 return result;
1158
1159 platform_dirent64 *dirent;
1160
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 1022 while ((dirent = platform_readdir(dirp))) {
1161
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 868 const std::string name(dirent->d_name);
1162 868 if ((name.length() >= suffix.length())
1163
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 1736 && (name.substr(name.length() - suffix.length()) == suffix)) {
1164
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 343 result.push_back(dir + "/" + name);
1165 }
1166 868 }
1167
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 154 closedir(dirp);
1168
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 154 std::sort(result.begin(), result.end());
1169 154 return result;
1170 }
1171
1172
1173 /**
1174 * Returns ls $dir/$prefixGLOB
1175 */
1176 190 std::vector<std::string> FindFilesByPrefix(const std::string &dir,
1177 const std::string &prefix) {
1178 190 std::vector<std::string> result;
1179
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 190 DIR *dirp = opendir(dir.c_str());
1180
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 190 if (!dirp)
1181 38 return result;
1182
1183 platform_dirent64 *dirent;
1184
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 1064 while ((dirent = platform_readdir(dirp))) {
1185
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 912 const std::string name(dirent->d_name);
1186 912 if ((name.length() >= prefix.length())
1187
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 1824 && (name.substr(0, prefix.length()) == prefix)) {
1188
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 418 result.push_back(dir + "/" + name);
1189 }
1190 912 }
1191
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 152 closedir(dirp);
1192
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 152 std::sort(result.begin(), result.end());
1193 152 return result;
1194 }
1195
1196
1197 /**
1198 * Finds all direct subdirectories under parent_dir (except ., ..). Used,
1199 * for instance, to parse /etc/cvmfs/repositories.d/<reponoame>
1200 */
1201 168 std::vector<std::string> FindDirectories(const std::string &parent_dir) {
1202 168 std::vector<std::string> result;
1203
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 168 DIR *dirp = opendir(parent_dir.c_str());
1204
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 168 if (!dirp)
1205 ✗ return result;
1206
1207 platform_dirent64 *dirent;
1208
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 882 while ((dirent = platform_readdir(dirp))) {
1209
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 714 const std::string name(dirent->d_name);
1210
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 714 if ((name == ".") || (name == ".."))
1211 336 continue;
1212
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 378 const std::string path = parent_dir + "/" + name;
1213
1214 platform_stat64 info;
1215 378 const int retval = platform_stat(path.c_str(), &info);
1216
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 378 if (retval != 0)
1217 ✗ continue;
1218
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 378 if (S_ISDIR(info.st_mode))
1219
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 294 result.push_back(path);
1220
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 714 }
1221
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 168 closedir(dirp);
1222
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 168 sort(result.begin(), result.end());
1223 168 return result;
1224 }
1225
1226
1227 /**
1228 * Finds all files and direct subdirectories under directory (except ., ..).
1229 */
1230 396 bool ListDirectory(const std::string &directory,
1231 std::vector<std::string> *names,
1232 std::vector<mode_t> *modes) {
1233 396 DIR *dirp = opendir(directory.c_str());
1234
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 396 if (!dirp)
1235 44 return false;
1236
1237 platform_dirent64 *dirent;
1238
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 5060 while ((dirent = platform_readdir(dirp))) {
1239
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 4708 const std::string name(dirent->d_name);
1240
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 4708 if ((name == ".") || (name == ".."))
1241 704 continue;
1242
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 4004 const std::string path = directory + "/" + name;
1243
1244 platform_stat64 info;
1245 4004 const int retval = platform_lstat(path.c_str(), &info);
1246
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 4004 if (retval != 0) {
1247 ✗ closedir(dirp);
1248 ✗ return false;
1249 }
1250
1251
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 4004 names->push_back(name);
1252
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 4004 modes->push_back(info.st_mode);
1253
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 4708 }
1254 352 closedir(dirp);
1255
1256 352 SortTeam(names, modes);
1257 352 return true;
1258 }
1259
1260
1261 /**
1262 * Looks whether exe is an executable file. If exe is not an absolute path,
1263 * searches the PATH environment.
1264 */
1265 123 std::string FindExecutable(const std::string &exe) {
1266
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 123 if (exe.empty())
1267 ✗ return "";
1268
1269 123 std::vector<std::string> search_paths;
1270
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 123 if (exe[0] == '/') {
1271
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 41 search_paths.push_back(GetParentPath(exe));
1272 } else {
1273 82 char *path_env = getenv("PATH");
1274
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 82 if (path_env) {
1275
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 82 search_paths = SplitString(path_env, ':');
1276 }
1277 }
1278
1279
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 492 for (unsigned i = 0; i < search_paths.size(); ++i) {
1280
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 451 if (search_paths[i].empty())
1281 369 continue;
1282
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 451 if (search_paths[i][0] != '/')
1283 ✗ continue;
1284
1285
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 902 std::string path = search_paths[i] + "/" + GetFileName(exe);
1286 platform_stat64 info;
1287 451 int retval = platform_stat(path.c_str(), &info);
1288
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 451 if (retval != 0)
1289 369 continue;
1290
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 82 if (!S_ISREG(info.st_mode))
1291 ✗ continue;
1292 82 retval = access(path.c_str(), X_OK);
1293
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 82 if (retval != 0)
1294 ✗ continue;
1295
1296 82 return path;
1297
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 451 }
1298
1299
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 41 return "";
1300 123 }
1301
1302
1303 31 std::string GetUserName() {
1304 struct passwd pwd;
1305 31 struct passwd *result = NULL;
1306 31 int bufsize = 16 * 1024;
1307 31 char *buf = static_cast<char *>(smalloc(bufsize));
1308
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 31 while (getpwuid_r(geteuid(), &pwd, buf, bufsize, &result) == ERANGE) {
1309 ✗ bufsize *= 2;
1310 ✗ buf = static_cast<char *>(srealloc(buf, bufsize));
1311 }
1312
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 31 if (result == NULL) {
1313 ✗ free(buf);
1314 ✗ return "";
1315 }
1316
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 31 std::string user_name = pwd.pw_name;
1317 31 free(buf);
1318 31 return user_name;
1319 31 }
1320
1321 ✗ std::string GetShell() {
1322 struct passwd pwd;
1323 ✗ struct passwd *result = NULL;
1324 ✗ int bufsize = 16 * 1024;
1325 ✗ char *buf = static_cast<char *>(smalloc(bufsize));
1326 ✗ while (getpwuid_r(geteuid(), &pwd, buf, bufsize, &result) == ERANGE) {
1327 ✗ bufsize *= 2;
1328 ✗ buf = static_cast<char *>(srealloc(buf, bufsize));
1329 }
1330 ✗ if (result == NULL) {
1331 ✗ free(buf);
1332 ✗ return "";
1333 }
1334 ✗ std::string shell = pwd.pw_shell;
1335 ✗ free(buf);
1336 ✗ return shell;
1337 }
1338
1339 /**
1340 * UID -> Name from passwd database
1341 */
1342 44 bool GetUserNameOf(uid_t uid, std::string *username) {
1343 struct passwd pwd;
1344 44 struct passwd *result = NULL;
1345 44 int bufsize = 16 * 1024;
1346 44 char *buf = static_cast<char *>(smalloc(bufsize));
1347
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 44 while (getpwuid_r(uid, &pwd, buf, bufsize, &result) == ERANGE) {
1348 ✗ bufsize *= 2;
1349 ✗ buf = static_cast<char *>(srealloc(buf, bufsize));
1350 }
1351
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 44 if (result == NULL) {
1352 ✗ free(buf);
1353 ✗ return false;
1354 }
1355
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 44 if (username)
1356
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 44 *username = result->pw_name;
1357 44 free(buf);
1358 44 return true;
1359 }
1360
1361
1362 /**
1363 * Name -> UID from passwd database
1364 */
1365 176 bool GetUidOf(const std::string &username, uid_t *uid, gid_t *main_gid) {
1366 struct passwd pwd;
1367 176 struct passwd *result = NULL;
1368 176 int bufsize = 16 * 1024;
1369 176 char *buf = static_cast<char *>(smalloc(bufsize));
1370
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 176 while (getpwnam_r(username.c_str(), &pwd, buf, bufsize, &result) == ERANGE) {
1371 ✗ bufsize *= 2;
1372 ✗ buf = static_cast<char *>(srealloc(buf, bufsize));
1373 }
1374
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 176 if (result == NULL) {
1375 43 free(buf);
1376 43 return false;
1377 }
1378 133 *uid = result->pw_uid;
1379 133 *main_gid = result->pw_gid;
1380 133 free(buf);
1381 133 return true;
1382 }
1383
1384
1385 /**
1386 * Name -> GID from groups database
1387 */
1388 76 bool GetGidOf(const std::string &groupname, gid_t *gid) {
1389 struct group grp;
1390 76 struct group *result = NULL;
1391 76 int bufsize = 16 * 1024;
1392 76 char *buf = static_cast<char *>(smalloc(bufsize));
1393
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 76 while (getgrnam_r(groupname.c_str(), &grp, buf, bufsize, &result) == ERANGE) {
1394 ✗ bufsize *= 2;
1395 ✗ buf = static_cast<char *>(srealloc(buf, bufsize));
1396 }
1397
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 76 if (result == NULL) {
1398 38 free(buf);
1399 38 return false;
1400 }
1401 38 *gid = result->gr_gid;
1402 38 free(buf);
1403 38 return true;
1404 }
1405
1406 /**
1407 * read the current umask of this process
1408 * Note: umask query is guarded by a global mutex. Hence, always use
1409 * this function and beware of scalability bottlenecks
1410 */
1411 1580 mode_t GetUmask() {
1412 1580 const MutexLockGuard m(&getumask_mutex);
1413 1580 const mode_t my_umask = umask(0);
1414 1580 umask(my_umask);
1415 3160 return my_umask;
1416 1580 }
1417
1418
1419 /**
1420 * Adds gid to the list of supplementary groups
1421 */
1422 ✗ bool AddGroup2Persona(const gid_t gid) {
1423 ✗ const int ngroups = getgroups(0, NULL);
1424 ✗ if (ngroups < 0)
1425 ✗ return false;
1426 ✗ gid_t *groups = static_cast<gid_t *>(smalloc((ngroups + 1) * sizeof(gid_t)));
1427 ✗ int retval = getgroups(ngroups, groups);
1428 ✗ if (retval < 0) {
1429 ✗ free(groups);
1430 ✗ return false;
1431 }
1432 ✗ for (int i = 0; i < ngroups; ++i) {
1433 ✗ if (groups[i] == gid) {
1434 ✗ free(groups);
1435 ✗ return true;
1436 }
1437 }
1438 ✗ groups[ngroups] = gid;
1439 ✗ retval = setgroups(ngroups + 1, groups);
1440 ✗ free(groups);
1441 ✗ return retval == 0;
1442 }
1443
1444
1445 70 std::string GetHomeDirectory() {
1446 70 const uid_t uid = getuid();
1447 struct passwd pwd;
1448 70 struct passwd *result = NULL;
1449 70 int bufsize = 16 * 1024;
1450 70 char *buf = static_cast<char *>(smalloc(bufsize));
1451
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 70 while (getpwuid_r(uid, &pwd, buf, bufsize, &result) == ERANGE) {
1452 ✗ bufsize *= 2;
1453 ✗ buf = static_cast<char *>(srealloc(buf, bufsize));
1454 }
1455
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 70 if (result == NULL) {
1456 ✗ free(buf);
1457 ✗ return "";
1458 }
1459
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 70 std::string home_dir = result->pw_dir;
1460 70 free(buf);
1461 70 return home_dir;
1462 70 }
1463
1464 /**
1465 * Returns the output of `uname -m`
1466 */
1467 47 std::string GetArch() {
1468 struct utsname info;
1469 47 const int retval = uname(&info);
1470
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 47 assert(retval == 0);
1471
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 47 return info.machine;
1472 }
1473
1474
1475 /**
1476 * Sets soft and hard limit for maximum number of open file descriptors.
1477 * Returns 0 on success, -1 on failure, -2 if running under valgrind.
1478 */
1479 257 int SetLimitNoFile(unsigned limit_nofile) {
1480 struct rlimit rpl;
1481 257 memset(&rpl, 0, sizeof(rpl));
1482 257 getrlimit(RLIMIT_NOFILE, &rpl);
1483
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 257 if (rpl.rlim_max < limit_nofile)
1484 165 rpl.rlim_max = limit_nofile;
1485 257 rpl.rlim_cur = limit_nofile;
1486 257 const int retval = setrlimit(RLIMIT_NOFILE, &rpl);
1487
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 257 if (retval == 0)
1488 92 return 0;
1489
1490 #ifdef HAS_VALGRIND_HEADERS
1491
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 165 return RUNNING_ON_VALGRIND ? -2 : -1;
1492 #else
1493 return -1;
1494 #endif
1495 }
1496
1497
1498 /**
1499 * Get the file descriptor limits
1500 */
1501 619 void GetLimitNoFile(unsigned *soft_limit, unsigned *hard_limit) {
1502 619 *soft_limit = 0;
1503 619 *hard_limit = 0;
1504
1505 struct rlimit rpl;
1506 619 memset(&rpl, 0, sizeof(rpl));
1507 619 getrlimit(RLIMIT_NOFILE, &rpl);
1508 619 *soft_limit = rpl.rlim_cur;
1509
1510 #ifdef __APPLE__
1511 int value = sysconf(_SC_OPEN_MAX);
1512 assert(value > 0);
1513 *hard_limit = value;
1514 #else
1515 619 *hard_limit = rpl.rlim_max;
1516 #endif
1517 619 }
1518
1519
1520 /**
1521 * Sets soft and hard limit for maximum core size
1522 */
1523 ✗ bool SetLimitCore(unsigned limit_core) {
1524 struct rlimit rpl;
1525 ✗ memset(&rpl, 0, sizeof(rpl));
1526 ✗ rpl.rlim_max = limit_core;
1527 ✗ rpl.rlim_cur = limit_core;
1528 ✗ return (setrlimit(RLIMIT_CORE, &rpl) == 0);
1529 }
1530
1531
1532 44 std::vector<LsofEntry> Lsof(const std::string &path) {
1533 44 std::vector<LsofEntry> result;
1534
1535 44 std::vector<std::string> proc_names;
1536 44 std::vector<mode_t> proc_modes;
1537
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 44 ListDirectory("/proc", &proc_names, &proc_modes);
1538
1539
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 2860 for (unsigned i = 0; i < proc_names.size(); ++i) {
1540
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 2816 if (!S_ISDIR(proc_modes[i]))
1541 2596 continue;
1542
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 660 if (proc_names[i].find_first_not_of("1234567890") != std::string::npos)
1543 440 continue;
1544
1545 220 std::vector<std::string> fd_names;
1546 220 std::vector<mode_t> fd_modes;
1547
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 220 const std::string proc_dir = "/proc/" + proc_names[i];
1548
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 220 const std::string fd_dir = proc_dir + "/fd";
1549
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 220 const bool rvb = ListDirectory(fd_dir, &fd_names, &fd_modes);
1550 220 uid_t proc_uid = 0;
1551
1552 // The working directory of the process requires special handling
1553
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 220 if (rvb) {
1554 platform_stat64 info;
1555 220 platform_stat(proc_dir.c_str(), &info);
1556 220 proc_uid = info.st_uid;
1557
1558
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 220 const std::string cwd = ReadSymlink(proc_dir + "/cwd");
1559
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 220 if (HasPrefix(cwd + "/", path + "/", false /* ignore_case */)) {
1560 44 LsofEntry entry;
1561
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 44 entry.pid = static_cast<pid_t>(String2Uint64(proc_names[i]));
1562 44 entry.owner = proc_uid;
1563 44 entry.read_only = true; // A bit sloppy but good enough for the moment
1564
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 44 entry.executable = ReadSymlink(proc_dir + "/exe");
1565
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 44 entry.path = cwd;
1566
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 44 result.push_back(entry);
1567 44 }
1568 220 }
1569
1570
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 1232 for (unsigned j = 0; j < fd_names.size(); ++j) {
1571
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 1012 if (!S_ISLNK(fd_modes[j]))
1572 968 continue;
1573
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 1012 if (fd_names[j].find_first_not_of("1234567890") != std::string::npos)
1574 ✗ continue;
1575
1576
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 2024 const std::string target = ReadSymlink(fd_dir + "/" + fd_names[j]);
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 1012 if (!HasPrefix(target + "/", path + "/", false /* ignore_case */))
1578 968 continue;
1579
1580 44 LsofEntry entry;
1581
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 44 entry.pid = static_cast<pid_t>(String2Uint64(proc_names[i]));
1582 44 entry.owner = proc_uid;
1583 44 entry.read_only = !((fd_modes[j] & S_IWUSR) == S_IWUSR);
1584
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 44 entry.executable = ReadSymlink(proc_dir + "/exe");
1585
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 44 entry.path = target;
1586
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 44 result.push_back(entry);
1587
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 1012 }
1588 220 }
1589
1590 88 return result;
1591 44 }
1592
1593
1594 144 bool ProcessExists(pid_t pid) {
1595
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 144 assert(pid > 0);
1596 144 const int retval = kill(pid, 0);
1597
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 144 if (retval == 0)
1598 96 return true;
1599 48 return (errno != ESRCH);
1600 }
1601
1602
1603 /**
1604 * Blocks a signal for the calling thread.
1605 */
1606 74 void BlockSignal(int signum) {
1607 sigset_t sigset;
1608 74 int retval = sigemptyset(&sigset);
1609
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 74 assert(retval == 0);
1610 74 retval = sigaddset(&sigset, signum);
1611
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 74 assert(retval == 0);
1612 74 retval = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
1613
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 74 assert(retval == 0);
1614 74 }
1615
1616
1617 /**
1618 * Waits for a signal. The signal should be blocked before for all threads.
1619 * Threads inherit their parent's signal mask.
1620 */
1621 34 void WaitForSignal(int signum) {
1622 int retval;
1623 do {
1624 34 retval = platform_sigwait(signum);
1625
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 34 } while ((retval != signum) && (errno == EINTR));
1626
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 34 assert(retval == signum);
1627 34 }
1628
1629
1630 /**
1631 * Returns -1 if the child crashed or the exit code otherwise.
1632 * @param pid Process identifier.
1633 * @param sig_ok List of signals that are still considered a successful
1634 * termination.
1635 */
1636 273 int WaitForChild(pid_t pid, const std::vector<int> &sig_ok) {
1637
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 273 assert(pid > 0);
1638 int statloc;
1639 while (true) {
1640
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 273 const pid_t retval = waitpid(pid, &statloc, 0);
1641
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 273 if (retval == -1) {
1642
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 41 if (errno == EINTR)
1643 ✗ continue;
1644 41 PANIC(kLogSyslogErr | kLogDebug, "waitpid failed with errno %d", errno);
1645 }
1646
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 232 assert(retval == pid);
1647 232 break;
1648 }
1649
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 232 if (WIFEXITED(statloc))
1650 191 return WEXITSTATUS(statloc);
1651 82 if (WIFSIGNALED(statloc)
1652
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 123 && (std::find(sig_ok.begin(), sig_ok.end(), WTERMSIG(statloc))
1653
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 123 != sig_ok.end()))
1654 ✗ return 0;
1655 41 return -1;
1656 }
1657
1658 /**
1659 * Exec a command as a daemon.
1660 */
1661
1662 ✗ bool ExecAsDaemon(const std::vector<std::string> &command_line,
1663 pid_t *child_pid) {
1664 ✗ assert(command_line.size() >= 1);
1665
1666 ✗ Pipe<kPipeDetachedChild> pipe_fork;
1667 ✗ const pid_t pid = fork();
1668 ✗ assert(pid >= 0);
1669 ✗ if (pid == 0) {
1670 pid_t pid_grand_child;
1671
1672 ✗ const char *argv[command_line.size() + 1];
1673 ✗ for (unsigned i = 0; i < command_line.size(); ++i)
1674 ✗ argv[i] = command_line[i].c_str();
1675 ✗ argv[command_line.size()] = NULL;
1676 ✗ int retval = setsid();
1677 ✗ assert(retval != -1);
1678
1679 ✗ pid_grand_child = fork();
1680 ✗ assert(pid_grand_child >= 0);
1681
1682 ✗ if (pid_grand_child != 0) {
1683 ✗ pipe_fork.Write<pid_t>(pid_grand_child);
1684 ✗ _exit(0);
1685 } else {
1686 ✗ const int null_read = open("/dev/null", O_RDONLY);
1687 ✗ const int null_write = open("/dev/null", O_WRONLY);
1688 ✗ assert((null_read >= 0) && (null_write >= 0));
1689 ✗ retval = dup2(null_read, 0);
1690 ✗ assert(retval == 0);
1691 ✗ retval = dup2(null_write, 1);
1692 ✗ assert(retval == 1);
1693 ✗ retval = dup2(null_write, 2);
1694 ✗ assert(retval == 2);
1695 ✗ close(null_read);
1696 ✗ close(null_write);
1697
1698 ✗ execvp(command_line[0].c_str(), const_cast<char **>(argv));
1699
1700 ✗ pipe_fork.CloseWriteFd();
1701 }
1702 }
1703 int statloc;
1704 ✗ waitpid(pid, &statloc, 0);
1705 ✗ pid_t buf_child_pid = 0;
1706 ✗ pipe_fork.Read(&buf_child_pid);
1707 ✗ if (child_pid != NULL)
1708 ✗ *child_pid = buf_child_pid;
1709 ✗ pipe_fork.CloseReadFd();
1710
1711 ✗ LogCvmfs(kLogCvmfs, kLogDebug, "exec'd as daemon %s (PID: %d)",
1712 ✗ command_line[0].c_str(), static_cast<int>(*child_pid));
1713 ✗ return true;
1714 }
1715
1716
1717 /**
1718 * Makes a daemon. The daemon() call is deprecated on OS X
1719 */
1720 ✗ void Daemonize() {
1721 pid_t pid;
1722 int statloc;
1723 ✗ if ((pid = fork()) == 0) {
1724 ✗ int retval = setsid();
1725 ✗ assert(retval != -1);
1726 ✗ if ((pid = fork()) == 0) {
1727
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 49 const int null_read = open("/dev/null", O_RDONLY);
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 49 const int null_write = open("/dev/null", O_WRONLY);
1729
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 49 assert((null_read >= 0) && (null_write >= 0));
1730 49 retval = dup2(null_read, 0);
1731
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 49 assert(retval == 0);
1732 49 retval = dup2(null_write, 1);
1733
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 49 assert(retval == 1);
1734 49 retval = dup2(null_write, 2);
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 49 assert(retval == 2);
1736
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 49 close(null_read);
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 49 close(null_write);
1738
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 49 LogCvmfs(kLogCvmfs, kLogDebug, "daemonized");
1739 } else {
1740 ✗ assert(pid > 0);
1741 ✗ _exit(0);
1742 }
1743 } else {
1744 ✗ assert(pid > 0);
1745 ✗ waitpid(pid, &statloc, 0);
1746 ✗ _exit(0);
1747 }
1748 49 }
1749
1750
1751 554 bool ExecuteBinary(int *fd_stdin,
1752 int *fd_stdout,
1753 int *fd_stderr,
1754 const std::string &binary_path,
1755 const std::vector<std::string> &argv,
1756 const bool double_fork,
1757 pid_t *child_pid) {
1758 int pipe_stdin[2];
1759 int pipe_stdout[2];
1760 int pipe_stderr[2];
1761
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 554 MakePipe(pipe_stdin);
1762
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 554 MakePipe(pipe_stdout);
1763
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 554 MakePipe(pipe_stderr);
1764
1765 554 std::set<int> preserve_fildes;
1766
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 554 preserve_fildes.insert(0);
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 554 preserve_fildes.insert(1);
1768
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 554 preserve_fildes.insert(2);
1769 554 std::map<int, int> map_fildes;
1770
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 554 map_fildes[pipe_stdin[0]] = 0; // Reading end of pipe_stdin
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 554 map_fildes[pipe_stdout[1]] = 1; // Writing end of pipe_stdout
1772
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 554 map_fildes[pipe_stderr[1]] = 2; // Writing end of pipe_stderr
1773 554 std::vector<std::string> cmd_line;
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 554 cmd_line.push_back(binary_path);
1775
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 554 cmd_line.insert(cmd_line.end(), argv.begin(), argv.end());
1776
1777
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 554 if (!ManagedExec(cmd_line,
1778 preserve_fildes,
1779 map_fildes,
1780 true /* drop_credentials */,
1781 false /* clear_env */,
1782 double_fork,
1783 child_pid)) {
1784 ✗ ClosePipe(pipe_stdin);
1785 ✗ ClosePipe(pipe_stdout);
1786 ✗ ClosePipe(pipe_stderr);
1787 ✗ return false;
1788 }
1789
1790
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 554 close(pipe_stdin[0]);
1791
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 554 close(pipe_stdout[1]);
1792
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 554 close(pipe_stderr[1]);
1793 554 *fd_stdin = pipe_stdin[1];
1794 554 *fd_stdout = pipe_stdout[0];
1795 554 *fd_stderr = pipe_stderr[0];
1796 554 return true;
1797 554 }
1798
1799
1800 /**
1801 * Opens /bin/sh and provides file descriptors to write into stdin and
1802 * read from stdout. Quit shell simply by closing stderr, stdout, and stdin.
1803 */
1804 454 bool Shell(int *fd_stdin, int *fd_stdout, int *fd_stderr) {
1805 454 const bool double_fork = true;
1806
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 908 return ExecuteBinary(fd_stdin, fd_stdout, fd_stderr, "/bin/sh",
1807 1362 std::vector<std::string>(), double_fork);
1808 }
1809
1810 struct ForkFailures { // TODO(rmeusel): C++11 (type safe enum)
1811 enum Names {
1812 kSendPid,
1813 kUnknown,
1814 kFailDupFd,
1815 kFailCloseFds,
1816 kFailGetFdFlags,
1817 kFailSetFdFlags,
1818 kFailDropCredentials,
1819 kFailExec,
1820 };
1821
1822 ✗ static std::string ToString(const Names name) {
1823 ✗ switch (name) {
1824 ✗ case kSendPid:
1825 ✗ return "Sending PID";
1826
1827 ✗ default:
1828 case kUnknown:
1829 ✗ return "Unknown Status";
1830 ✗ case kFailDupFd:
1831 ✗ return "Duplicate File Descriptor";
1832 ✗ case kFailCloseFds:
1833 ✗ return "Close File Descriptors";
1834 ✗ case kFailGetFdFlags:
1835 ✗ return "Read File Descriptor Flags";
1836 ✗ case kFailSetFdFlags:
1837 ✗ return "Set File Descriptor Flags";
1838 ✗ case kFailDropCredentials:
1839 ✗ return "Lower User Permissions";
1840 ✗ case kFailExec:
1841 ✗ return "Invoking execvp()";
1842 }
1843 }
1844 };
1845
1846 /**
1847 * Loop through all possible FDs and close them.
1848 */
1849 25 static bool CloseAllFildesUntilMaxFD(const std::set<int> &preserve_fildes,
1850 long max_fd) { // NOLINT(runtime/int)
1851
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 12525 for (long fd = 0; fd < max_fd; fd++) { // NOLINT(runtime/int)
1852
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 12500 if (preserve_fildes.count(static_cast<int>(fd)) == 0) {
1853 12375 close(static_cast<int>(fd));
1854 }
1855 }
1856
1857 25 return true;
1858 }
1859
1860 /**
1861 * Enumerate currently open file descriptors via a procfs-like directory
1862 * (/proc/self/fd on Linux, /dev/fd on macOS) and close the ones not in
1863 * preserve_fildes.
1864 */
1865 26 static bool CloseAllFildesInFdDir(const char *fd_dir,
1866 const std::set<int> &preserve_fildes) {
1867 26 DIR *dirp = opendir(fd_dir);
1868
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 26 if (!dirp)
1869 ✗ return false;
1870
1871 platform_dirent64 *dirent;
1872
1873
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 516 while ((dirent = platform_readdir(dirp))) {
1874
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 490 const std::string name(dirent->d_name);
1875 uint64_t name_uint64;
1876
1877 // Make sure the dir name is digits only (skips ".", ".." and similar).
1878
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 490 if (!String2Uint64Parse(name, &name_uint64)) {
1879 52 continue;
1880 }
1881
1882 438 const int fd = static_cast<int>(name_uint64);
1883
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 438 if (preserve_fildes.count(fd)) {
1884 128 continue;
1885 }
1886
1887
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 310 close(fd);
1888
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 490 }
1889
1890 26 closedir(dirp);
1891
1892 26 return true;
1893 }
1894
1895 /**
1896 * Closes all file descriptors except the ones in preserve_fildes.
1897 * To be used after fork but before exec.
1898 */
1899 51 bool CloseAllFildes(const std::set<int> &preserve_fildes) {
1900 51 const long max_fd = sysconf(_SC_OPEN_MAX); // NOLINT(runtime/int)
1901
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 51 if (max_fd < 0) {
1902 ✗ return false;
1903 }
1904
1905 // When RLIMIT_NOFILE is unbounded (sysconf returns LONG_MAX) or simply very
1906 // large, iterating [0, max_fd) is impractical. Enumerate the actually open
1907 // fds via the kernel's fd directory instead.
1908
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 51 if (max_fd > 100000) {
1909 #ifdef __APPLE__
1910 return CloseAllFildesInFdDir("/dev/fd", preserve_fildes);
1911 #else
1912 26 return CloseAllFildesInFdDir("/proc/self/fd", preserve_fildes);
1913 #endif
1914 }
1915
1916 25 return CloseAllFildesUntilMaxFD(preserve_fildes, max_fd);
1917 }
1918
1919 /**
1920 * Execve to the given command line, preserving the given file descriptors.
1921 * If stdin, stdout, stderr should be preserved, add 0, 1, 2.
1922 * File descriptors from the parent process can also be mapped to the new
1923 * process (dup2) using map_fildes. Can be useful for
1924 * stdout/in/err redirection.
1925 * NOTE: The destination fildes have to be preserved!
1926 * NOTE: For forked child, held mutexes have invalid state, avoid operations.
1927 * Does a double fork to detach child.
1928 * The command_line parameter contains the binary at index 0 and the arguments
1929 * in the rest of the vector.
1930 * Using the optional parameter *pid it is possible to retrieve the process ID
1931 * of the spawned process.
1932 */
1933 634 bool ManagedExec(const std::vector<std::string> &command_line,
1934 const std::set<int> &preserve_fildes,
1935 const std::map<int, int> &map_fildes,
1936 const bool drop_credentials,
1937 const bool clear_env,
1938 const bool double_fork,
1939 pid_t *child_pid) {
1940
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 634 assert(command_line.size() >= 1);
1941
1942
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 634 Pipe<kPipeDetachedChild> pipe_fork;
1943 634 const pid_t pid = fork();
1944
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 636 assert(pid >= 0);
1945
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 636 if (pid == 0) {
1946 pid_t pid_grand_child;
1947 int fd_flags;
1948 2 ForkFailures::Names failed = ForkFailures::kUnknown;
1949
1950 2 std::set<int> skip_fds = preserve_fildes;
1951
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 2 skip_fds.insert(pipe_fork.GetWriteFd());
1952
1953
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 2 if (clear_env) {
1954 #ifdef __APPLE__
1955 environ = NULL;
1956 #else
1957 ✗ const int retval = clearenv();
1958 ✗ assert(retval == 0);
1959 #endif
1960 }
1961
1962 2 const char *argv[command_line.size() + 1];
1963
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 5 for (unsigned i = 0; i < command_line.size(); ++i)
1964 3 argv[i] = command_line[i].c_str();
1965 2 argv[command_line.size()] = NULL;
1966
1967 // Child, map file descriptors
1968 4 for (std::map<int, int>::const_iterator i = map_fildes.begin(),
1969 2 iEnd = map_fildes.end();
1970
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 8 i != iEnd;
1971 6 ++i) {
1972 6 const int retval = dup2(i->first, i->second);
1973
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 6 if (retval == -1) {
1974 ✗ failed = ForkFailures::kFailDupFd;
1975 ✗ goto fork_failure;
1976 }
1977 }
1978
1979 // Child, close file descriptors
1980
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 2 if (!CloseAllFildes(skip_fds)) {
1981 ✗ failed = ForkFailures::kFailCloseFds;
1982 ✗ goto fork_failure;
1983 }
1984
1985 // Double fork to disconnect from parent
1986
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 2 if (double_fork) {
1987 ✗ pid_grand_child = fork();
1988
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 28 assert(pid_grand_child >= 0);
1989
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 28 if (pid_grand_child != 0)
1990 ✗ _exit(0);
1991 }
1992
1993
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 30 fd_flags = fcntl(pipe_fork.GetWriteFd(), F_GETFD);
1994
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 30 if (fd_flags < 0) {
1995 ✗ failed = ForkFailures::kFailGetFdFlags;
1996 ✗ goto fork_failure;
1997 }
1998 30 fd_flags |= FD_CLOEXEC;
1999
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 30 if (fcntl(pipe_fork.GetWriteFd(), F_SETFD, fd_flags) < 0) {
2000 ✗ failed = ForkFailures::kFailSetFdFlags;
2001 ✗ goto fork_failure;
2002 }
2003
2004 #ifdef DEBUGMSG
2005
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 30 assert(setenv("__CVMFS_DEBUG_MODE__", "yes", 1) == 0);
2006 #endif
2007
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 30 if (drop_credentials && SetuidCapabilityPermitted() &&
2008 ✗ !SwitchCredentials(geteuid(),
2009 getegid(),
2010 false /* temporarily */,
2011 true /* avoid_mutexes */)) {
2012 ✗ failed = ForkFailures::kFailDropCredentials;
2013 ✗ goto fork_failure;
2014 }
2015
2016 // retrieve the PID of the new (grand) child process and send it to the
2017 // grand father
2018 30 pid_grand_child = getpid();
2019 30 failed = ForkFailures::kSendPid;
2020
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 30 pipe_fork.Write<ForkFailures::Names>(failed);
2021
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 30 pipe_fork.Write<pid_t>(pid_grand_child);
2022
2023 30 execvp(command_line[0].c_str(), const_cast<char **>(argv));
2024
2025 ✗ failed = ForkFailures::kFailExec;
2026
2027 ✗ fork_failure:
2028 ✗ pipe_fork.Write<ForkFailures::Names>(failed);
2029 ✗ _exit(1);
2030
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 2 }
2031
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 634 if (double_fork) {
2032 int statloc;
2033
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 565 waitpid(pid, &statloc, 0);
2034 }
2035
2036
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 634 pipe_fork.CloseWriteFd();
2037
2038 // Either the PID or a return value is sent
2039 ForkFailures::Names status_code;
2040
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 634 pipe_fork.Read<ForkFailures::Names>(&status_code);
2041
2042
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 634 if (status_code != ForkFailures::kSendPid) {
2043 ✗ pipe_fork.CloseReadFd();
2044 ✗ LogCvmfs(kLogCvmfs, kLogDebug, "managed execve failed (%s)",
2045 ✗ ForkFailures::ToString(status_code).c_str());
2046 ✗ return false;
2047 }
2048
2049 // read the PID of the spawned process if requested
2050 // (the actual read needs to be done in any case!)
2051 634 pid_t buf_child_pid = 0;
2052
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 634 pipe_fork.Read(&buf_child_pid);
2053
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 634 if (child_pid != NULL)
2054 180 *child_pid = buf_child_pid;
2055
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 634 pipe_fork.CloseReadFd();
2056
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 634 LogCvmfs(kLogCvmfs, kLogDebug, "execve'd %s (PID: %d)",
2057 634 command_line[0].c_str(), static_cast<int>(buf_child_pid));
2058 634 return true;
2059 634 }
2060
2061
2062 /**
2063 * Sleeps using select. This is without signals and doesn't interfere with
2064 * other uses of the ALRM signal.
2065 */
2066 906 void SafeSleepMs(const unsigned ms) {
2067 struct timeval wait_for;
2068 906 wait_for.tv_sec = ms / 1000;
2069 906 wait_for.tv_usec = (ms % 1000) * 1000;
2070
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 906 select(0, NULL, NULL, NULL, &wait_for);
2071 896 }
2072
2073
2074 /**
2075 * Deal with EINTR and partial writes.
2076 */
2077 6557 bool SafeWrite(int fd, const void *buf, size_t nbyte) {
2078
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 12948 while (nbyte) {
2079 6557 const ssize_t retval = write(fd, buf, nbyte);
2080
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 6557 if (retval < 0) {
2081
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 166 if (errno == EINTR)
2082 ✗ continue;
2083 166 return false;
2084 }
2085
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 6391 assert(static_cast<size_t>(retval) <= nbyte);
2086 6391 buf = reinterpret_cast<const char *>(buf) + retval;
2087 6391 nbyte -= retval;
2088 }
2089 6391 return true;
2090 }
2091
2092 /**
2093 * The contents of the iov vector might be modified by the function.
2094 */
2095 185124 bool SafeWriteV(int fd, struct iovec *iov, unsigned iovcnt) {
2096 185124 unsigned nbytes = 0;
2097
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 706712 for (unsigned i = 0; i < iovcnt; ++i)
2098 521588 nbytes += iov[i].iov_len;
2099 185124 unsigned iov_idx = 0;
2100
2101
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 185150 while (nbytes) {
2102 370248 const ssize_t retval = writev(fd, &iov[iov_idx],
2103 185124 static_cast<int>(iovcnt - iov_idx));
2104
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 185124 if (retval < 0) {
2105 ✗ if (errno == EINTR)
2106 ✗ continue;
2107 ✗ return false;
2108 }
2109
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 185124 assert(static_cast<size_t>(retval) <= nbytes);
2110 185124 nbytes -= retval;
2111
2112 185124 unsigned sum_written_blocks = 0;
2113 185124 while ((sum_written_blocks + iov[iov_idx].iov_len)
2114
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 521510 <= static_cast<size_t>(retval)) {
2115 521484 sum_written_blocks += iov[iov_idx].iov_len;
2116 521484 iov_idx++;
2117
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 521484 if (iov_idx == iovcnt) {
2118
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 185098 assert(sum_written_blocks == static_cast<size_t>(retval));
2119 185098 return true;
2120 }
2121 }
2122 26 const unsigned offset = retval - sum_written_blocks;
2123 26 iov[iov_idx].iov_len -= offset;
2124 26 iov[iov_idx].iov_base = reinterpret_cast<char *>(iov[iov_idx].iov_base)
2125 26 + offset;
2126 }
2127
2128 26 return true;
2129 }
2130
2131
2132 /**
2133 * Deal with EINTR and partial reads.
2134 */
2135 4560960 ssize_t SafeRead(int fd, void *buf, size_t nbyte) {
2136 4560960 ssize_t total_bytes = 0;
2137
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 9353861 while (nbyte) {
2138 4802328 const ssize_t retval = read(fd, buf, nbyte);
2139
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 4806026 if (retval < 0) {
2140
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 96 if (errno == EINTR)
2141 ✗ continue;
2142 96 return -1;
2143
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 4805930 } else if (retval == 0) {
2144 13029 return total_bytes;
2145 }
2146
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 4792901 assert(static_cast<size_t>(retval) <= nbyte);
2147 4792901 buf = reinterpret_cast<char *>(buf) + retval;
2148 4792901 nbyte -= retval;
2149 4792901 total_bytes += retval;
2150 }
2151 4551533 return total_bytes;
2152 }
2153
2154
2155 /**
2156 * Pull file contents into a string
2157 */
2158 776 bool SafeReadToString(int fd, std::string *final_result) {
2159
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 776 if (!final_result) {
2160 ✗ return false;
2161 }
2162
2163 776 std::string tmp_result;
2164 static const int buf_size = 4096;
2165 char buf[4096];
2166 776 ssize_t total_bytes = -1;
2167 do {
2168
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 7208 total_bytes = SafeRead(fd, buf, buf_size);
2169
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 7208 if (total_bytes < 0) {
2170 48 return false;
2171 }
2172
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 7160 tmp_result.append(buf, total_bytes);
2173
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 7160 } while (total_bytes == buf_size);
2174 728 final_result->swap(tmp_result);
2175 728 return true;
2176 776 }
2177
2178 4704 bool SafeWriteToFile(const std::string &content,
2179 const std::string &path,
2180 int mode) {
2181 4704 const int fd = open(path.c_str(), O_WRONLY | O_CREAT | O_TRUNC, mode);
2182
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 4704 if (fd < 0)
2183 ✗ return false;
2184 4704 const bool retval = SafeWrite(fd, content.data(), content.size());
2185 4704 close(fd);
2186 4704 return retval;
2187 }
2188
2189
2190 #ifdef CVMFS_NAMESPACE_GUARD
2191 } // namespace CVMFS_NAMESPACE_GUARD
2192 #endif
2193