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/** |
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* This file is part of the CernVM File System. |
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*/ |
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#include "helper_util.h" |
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#include <alloca.h> |
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#include <errno.h> |
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#include <stdint.h> |
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#include <unistd.h> |
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#include <cassert> |
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#include <cstdio> |
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#include <cstdlib> |
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#include <cstring> |
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#include "authz/helper_log.h" |
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#include "json.h" |
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typedef struct json_value JSON; |
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#ifdef __APPLE__ |
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#define strdupa(s) strcpy(/* NOLINT(runtime/printf) */\ |
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reinterpret_cast<char *>(alloca(strlen((s)) + 1)), (s)) |
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#endif |
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using namespace std; // NOLINT |
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/** |
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* Helper binaries are supposed to be called from the cvmfs client, not |
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* stand-alone. |
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*/ |
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void CheckCallContext() { |
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if (getenv("CVMFS_AUTHZ_HELPER") == NULL) { |
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printf("This program is supposed to be called from the CernVM-FS client."); |
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printf("\n"); |
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abort(); |
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} |
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} |
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void ParseHandshakeInit(const string &msg) { |
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block_allocator allocator(2048); |
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char *err_pos; char *err_desc; int err_line; |
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JSON *json = json_parse(strdupa(msg.c_str()), |
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&err_pos, &err_desc, &err_line, |
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&allocator); |
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assert((json != NULL) && (json->first_child != NULL)); |
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json = json->first_child; |
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assert((string(json->name) == "cvmfs_authz_v1")); |
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json = json->first_child; |
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while (json) { |
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string name(json->name); |
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if (name == "debug_log") { |
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SetLogAuthzDebug(string(json->string_value) + ".authz"); |
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} else if (name == "fqrn") { |
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LogAuthz(kLogAuthzDebug, "fqrn is %s", json->string_value); |
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SetLogAuthzSyslogPrefix(string(json->string_value)); |
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} else if (name == "syslog_level") { |
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SetLogAuthzSyslogLevel(json->int_value); |
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} else if (name == "syslog_facility") { |
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SetLogAuthzSyslogFacility(json->int_value); |
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} |
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json = json->next_sibling; |
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} |
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} |
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void ParseRequest(const string &msg) { |
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block_allocator allocator(2048); |
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char *err_pos; char *err_desc; int err_line; |
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JSON *json = json_parse(strdupa(msg.c_str()), |
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&err_pos, &err_desc, &err_line, |
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&allocator); |
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assert((json != NULL) && (json->first_child != NULL)); |
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json = json->first_child; |
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assert((string(json->name) == "cvmfs_authz_v1")); |
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json = json->first_child; |
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while (json) { |
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string name(json->name); |
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if (name == "msgid") { |
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if (json->int_value == 4) { /* kAuthzMsgQuit */ |
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LogAuthz(kLogAuthzDebug, "shut down"); |
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exit(0); |
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} |
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} |
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json = json->next_sibling; |
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} |
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} |
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/** |
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* Get bytes from stdin. |
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*/ |
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static void Read(void *buf, size_t nbyte) { |
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int num_bytes; |
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do { |
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num_bytes = read(fileno(stdin), buf, nbyte); |
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} while ((num_bytes < 0) && (errno == EINTR)); |
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assert((num_bytes >= 0) && (static_cast<size_t>(num_bytes) == nbyte)); |
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} |
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/** |
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* Reads a complete message from the cvmfs client. |
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*/ |
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string ReadMsg() { |
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uint32_t version; |
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uint32_t length; |
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Read(&version, sizeof(version)); |
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assert(version == kProtocolVersion); |
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Read(&length, sizeof(length)); |
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if (length == 0) |
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return ""; |
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char *buf = reinterpret_cast<char *>(alloca(length)); |
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Read(buf, length); |
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return string(buf, length); |
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} |
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/** |
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* Send bytes to stdout. |
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*/ |
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static void Write(const void *buf, size_t nbyte) { |
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int num_bytes; |
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do { |
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num_bytes = write(fileno(stdout), buf, nbyte); |
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} while ((num_bytes < 0) && (errno == EINTR)); |
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assert((num_bytes >= 0) && (static_cast<size_t>(num_bytes) == nbyte)); |
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} |
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/** |
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* Sends a (JSON formatted) message back to the cvmfs client. |
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*/ |
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void WriteMsg(const string &msg) { |
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struct { |
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uint32_t version; |
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uint32_t length; |
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} header; |
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header.version = kProtocolVersion; |
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header.length = msg.length(); |
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Write(&header, sizeof(header)); |
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Write(msg.data(), header.length); |
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} |