/*------------------------------------------------------------------------- * * postmaster.c * This program acts as a clearing house for requests to the * POSTGRES system. Frontend programs send a startup message * to the Postmaster and the postmaster uses the info in the * message to setup a backend process. * * Portions Copyright (c) 1996-2000, PostgreSQL, Inc * Portions Copyright (c) 1994, Regents of the University of California * * * IDENTIFICATION * $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.193 2000/11/27 04:03:20 inoue Exp $ * * NOTES * * Initialization: * The Postmaster sets up a few shared memory data structures * for the backends. It should at the very least initialize the * lock manager. * * Synchronization: * The Postmaster shares memory with the backends and will have to lock * the shared memory it accesses. The Postmaster should never block * on messages from clients. * * Garbage Collection: * The Postmaster cleans up after backends if they have an emergency * exit and/or core dump. * * Communication: * *------------------------------------------------------------------------- */ #include "postgres.h" #include #include #include #include #include #include #include #include #include #include #include #include /* moved here to prevent double define */ #include #include #ifdef HAVE_SYS_SELECT_H #include #endif #ifdef HAVE_GETOPT_H #include #endif #include "catalog/pg_database.h" #include "commands/async.h" #include "lib/dllist.h" #include "libpq/auth.h" #include "libpq/crypt.h" #include "libpq/libpq.h" #include "libpq/pqcomm.h" #include "libpq/pqsignal.h" #include "miscadmin.h" #include "nodes/nodes.h" #include "storage/fd.h" #include "storage/ipc.h" #include "storage/proc.h" #include "access/xlog.h" #include "tcop/tcopprot.h" #include "utils/exc.h" #include "utils/guc.h" #include "utils/memutils.h" #include "bootstrap/bootstrap.h" #define INVALID_SOCK (-1) #define ARGV_SIZE 64 #ifdef HAVE_SIGPROCMASK sigset_t UnBlockSig, BlockSig; #else int UnBlockSig, BlockSig; #endif /* * Info for garbage collection. Whenever a process dies, the Postmaster * cleans up after it. Currently, NO information is required for cleanup, * but I left this structure around in case that changed. */ typedef struct bkend { int pid; /* process id of backend */ long cancel_key; /* cancel key for cancels for this backend */ } Backend; Port *MyBackendPort = NULL; /* list of active backends. For garbage collection only now. */ static Dllist *BackendList; /* list of ports associated with still open, but incomplete connections */ static Dllist *PortList; /* The socket number we are listening for connections on */ int PostPortNumber; char * UnixSocketDir; char * Virtual_host; /* * This is a sequence number that indicates how many times we've had to * throw away the shared memory and start over because we doubted its * integrity. It starts off at zero and is incremented every time we * start over. We use this to ensure that we use a new IPC shared memory * key for the new shared memory segment in case the old segment isn't * entirely gone yet. * * The sequence actually cycles back to 0 after 9, so pathologically there * could be an IPC failure if 10 sets of backends are all stuck and won't * release IPC resources. */ static short shmem_seq = 0; /* * This is the base IPC shared memory key. Other keys are generated by * adding to this. */ static IpcMemoryKey ipc_key; /* * MaxBackends is the actual limit on the number of backends we will * start. The default is established by configure, but it can be * readjusted from 1..MAXBACKENDS with the postmaster -N switch. Note * that a larger MaxBackends value will increase the size of the shared * memory area as well as cause the postmaster to grab more kernel * semaphores, even if you never actually use that many backends. */ int MaxBackends = DEF_MAXBACKENDS; static char *progname = (char *) NULL; static char **real_argv; static int real_argc; static time_t tnow; /* flag to indicate that SIGHUP arrived during server loop */ static volatile bool got_SIGHUP = false; /* * Default Values */ static int ServerSock_INET = INVALID_SOCK; /* stream socket server */ #ifdef HAVE_UNIX_SOCKETS static int ServerSock_UNIX = INVALID_SOCK; /* stream socket server */ #endif #ifdef USE_SSL static SSL_CTX *SSL_context = NULL; /* Global SSL context */ #endif /* * Set by the -o option */ static char ExtraOptions[MAXPGPATH]; /* * These globals control the behavior of the postmaster in case some * backend dumps core. Normally, it kills all peers of the dead backend * and reinitializes shared memory. By specifying -s or -n, we can have * the postmaster stop (rather than kill) peers and not reinitialize * shared data structures. */ static bool Reinit = true; static int SendStop = false; bool NetServer = false; /* listen on TCP/IP */ bool EnableSSL = false; bool SilentMode = false; /* silent mode (-S) */ int CheckPointTimeout = 300; static pid_t StartupPID = 0, ShutdownPID = 0, CheckPointPID = 0; static time_t checkpointed = 0; #define NoShutdown 0 #define SmartShutdown 1 #define FastShutdown 2 static int Shutdown = NoShutdown; static bool FatalError = false; /* * State for assigning random salts and cancel keys. * Also, the global MyCancelKey passes the cancel key assigned to a given * backend from the postmaster to that backend (via fork). */ static unsigned int random_seed = 0; extern char *optarg; extern int optind, opterr; /* * postmaster.c - function prototypes */ static void pmdaemonize(int argc, char *argv[]); static Port *ConnCreate(int serverFd); static void ConnFree(Port *port); static void reset_shared(unsigned short port); static void SIGHUP_handler(SIGNAL_ARGS); static void pmdie(SIGNAL_ARGS); static void reaper(SIGNAL_ARGS); static void dumpstatus(SIGNAL_ARGS); static void CleanupProc(int pid, int exitstatus); static int DoBackend(Port *port); static void ExitPostmaster(int status); static void usage(const char *); static int ServerLoop(void); static int BackendStartup(Port *port); static int readStartupPacket(void *arg, PacketLen len, void *pkt); static int processCancelRequest(Port *port, PacketLen len, void *pkt); static int initMasks(fd_set *rmask, fd_set *wmask); static long PostmasterRandom(void); static void RandomSalt(char *salt); static void SignalChildren(SIGNAL_ARGS); static int CountChildren(void); static bool CreateOptsFile(int argc, char *argv[]); static pid_t SSDataBase(int xlop); #define StartupDataBase() SSDataBase(BS_XLOG_STARTUP) #define CheckPointDataBase() SSDataBase(BS_XLOG_CHECKPOINT) #define ShutdownDataBase() SSDataBase(BS_XLOG_SHUTDOWN) #ifdef USE_SSL static void InitSSL(void); #endif #ifdef CYR_RECODE extern void GetCharSetByHost(char *, int, char *); #endif static void checkDataDir(const char *checkdir) { char path[MAXPGPATH]; FILE *fp; if (checkdir == NULL) { fprintf(stderr, "%s does not know where to find the database system " "data. You must specify the directory that contains the " "database system either by specifying the -D invocation " "option or by setting the PGDATA environment variable.\n\n", progname); exit(2); } snprintf(path, sizeof(path), "%s%cglobal%cpg_control", checkdir, SEP_CHAR, SEP_CHAR); fp = AllocateFile(path, PG_BINARY_R); if (fp == NULL) { fprintf(stderr, "%s does not find the database system." "\n\tExpected to find it in the PGDATA directory \"%s\"," "\n\tbut unable to open file \"%s\": %s\n\n", progname, checkdir, path, strerror(errno)); exit(2); } FreeFile(fp); ValidatePgVersion(checkdir); } int PostmasterMain(int argc, char *argv[]) { int opt; int status; char original_extraoptions[MAXPGPATH]; char *potential_DataDir = NULL; IsUnderPostmaster = true; /* so that backends know this */ *original_extraoptions = '\0'; progname = argv[0]; real_argv = argv; real_argc = argc; /* * Catch standard options before doing much else. This even works * on systems without getopt_long. */ if (argc > 1) { if (strcmp(argv[1], "--help")==0 || strcmp(argv[1], "-?")==0) { usage(progname); exit(0); } if (strcmp(argv[1], "--version")==0 || strcmp(argv[1], "-V")==0) { puts("postmaster (PostgreSQL) " PG_VERSION); exit(0); } } /* * for security, no dir or file created can be group or other * accessible */ umask((mode_t) 0077); MyProcPid = getpid(); /* * Fire up essential subsystems: error and memory management */ EnableExceptionHandling(true); MemoryContextInit(); /* * By default, palloc() requests in the postmaster will be allocated * in the PostmasterContext, which is space that can be recycled by * backends. Allocated data that needs to be available to backends * should be allocated in TopMemoryContext. */ PostmasterContext = AllocSetContextCreate(TopMemoryContext, "Postmaster", ALLOCSET_DEFAULT_MINSIZE, ALLOCSET_DEFAULT_INITSIZE, ALLOCSET_DEFAULT_MAXSIZE); MemoryContextSwitchTo(PostmasterContext); /* * Options setup */ potential_DataDir = getenv("PGDATA"); /* default value */ ResetAllOptions(); /* * First we must scan for a -D argument to get the data dir. Then * read the config file. Finally, scan all the other arguments. * (Command line switches override config file.) * * Note: The two lists of options must be exactly the same, even * though perhaps the first one would only have to be "D:" with * opterr turned off. But some versions of getopt (notably GNU) * are going to arbitrarily permute some "non-options" (according * to the local world view) which will result in some switches * being associated with the wrong argument. Death and destruction * will occur. */ opterr = 1; while ((opt = getopt(argc, argv, "A:a:B:b:c:D:d:Fh:ik:lm:MN:no:p:Ss-:")) != EOF) { switch(opt) { case 'D': potential_DataDir = optarg; break; case '?': fprintf(stderr, "Try '%s --help' for more information.\n", progname); exit(1); } } /* * Non-option switch arguments don't exist. */ if (optind < argc) { fprintf(stderr, "%s: invalid argument -- %s\n", progname, argv[optind]); fprintf(stderr, "Try '%s --help' for more information.\n", progname); exit(1); } checkDataDir(potential_DataDir); /* issues error messages */ SetDataDir(potential_DataDir); ProcessConfigFile(PGC_POSTMASTER); IgnoreSystemIndexes(false); optind = 1; /* start over */ #ifdef HAVE_INT_OPTRESET optreset = 1; #endif while ((opt = getopt(argc, argv, "A:a:B:b:c:D:d:Fh:ik:lm:MN:no:p:Ss-:")) != EOF) { switch (opt) { case 'A': #ifndef USE_ASSERT_CHECKING fprintf(stderr, "Assert checking is not compiled in\n"); #else assert_enabled = atoi(optarg); #endif break; case 'a': /* Can no longer set authentication method. */ break; case 'B': NBuffers = atoi(optarg); break; case 'b': /* Can no longer set the backend executable file to use. */ break; case 'D': /* already done above */ break; case 'd': /* * Turn on debugging for the postmaster and the backend * servers descended from it. */ DebugLvl = atoi(optarg); break; case 'F': enableFsync = false; break; case 'h': Virtual_host = optarg; break; case 'i': NetServer = true; break; case 'k': /* Set PGUNIXSOCKET by hand. */ UnixSocketDir = optarg; break; #ifdef USE_SSL case 'l': EnableSSL = true; break; #endif case 'm': /* Multiplexed backends no longer supported. */ break; case 'M': /* * ignore this flag. This may be passed in because the * program was run as 'postgres -M' instead of * 'postmaster' */ break; case 'N': /* * The max number of backends to start. Can't set to less * than 1 or more than compiled-in limit. */ MaxBackends = atoi(optarg); if (MaxBackends < 1) MaxBackends = 1; if (MaxBackends > MAXBACKENDS) MaxBackends = MAXBACKENDS; break; case 'n': /* Don't reinit shared mem after abnormal exit */ Reinit = false; break; case 'o': /* * Other options to pass to the backend on the command * line -- useful only for debugging. */ strcat(ExtraOptions, " "); strcat(ExtraOptions, optarg); strcpy(original_extraoptions, optarg); break; case 'p': PostPortNumber = atoi(optarg); break; case 'S': /* * Start in 'S'ilent mode (disassociate from controlling * tty). You may also think of this as 'S'ysV mode since * it's most badly needed on SysV-derived systems like * SVR4 and HP-UX. */ SilentMode = true; break; case 's': /* * In the event that some backend dumps core, send * SIGSTOP, rather than SIGUSR1, to all its peers. This * lets the wily post_hacker collect core dumps from * everyone. */ SendStop = true; break; case 'c': case '-': { char *name, *value; ParseLongOption(optarg, &name, &value); if (!value) { if (opt == '-') elog(ERROR, "--%s requires argument", optarg); else elog(ERROR, "-c %s requires argument", optarg); } SetConfigOption(name, value, PGC_POSTMASTER); free(name); if (value) free(value); break; } default: /* shouldn't get here */ fprintf(stderr, "Try '%s --help' for more information.\n", progname); exit(1); } } /* * Check for invalid combinations of switches */ if (NBuffers < 2 * MaxBackends || NBuffers < 16) { /* * Do not accept -B so small that backends are likely to starve * for lack of buffers. The specific choices here are somewhat * arbitrary. */ fprintf(stderr, "%s: The number of buffers (-B) must be at least twice the number of allowed connections (-N) and at least 16.\n", progname); exit(1); } if (DebugLvl > 2) { extern char **environ; char **p; fprintf(stderr, "%s: PostmasterMain: initial environ dump:\n", progname); fprintf(stderr, "-----------------------------------------\n"); for (p = environ; *p; ++p) fprintf(stderr, "\t%s\n", *p); fprintf(stderr, "-----------------------------------------\n"); } /* * Establish input sockets. */ #ifdef USE_SSL if (EnableSSL && !NetServer) { fprintf(stderr, "%s: For SSL, TCP/IP connections must be enabled. See -? for help.\n", progname); exit(1); } if (EnableSSL) InitSSL(); #endif if (NetServer) { status = StreamServerPort(AF_INET, Virtual_host, (unsigned short) PostPortNumber, UnixSocketDir, &ServerSock_INET); if (status != STATUS_OK) { fprintf(stderr, "%s: cannot create INET stream port\n", progname); ExitPostmaster(1); } } #ifdef HAVE_UNIX_SOCKETS status = StreamServerPort(AF_UNIX, Virtual_host, (unsigned short) PostPortNumber, UnixSocketDir, &ServerSock_UNIX); if (status != STATUS_OK) { fprintf(stderr, "%s: cannot create UNIX stream port\n", progname); ExitPostmaster(1); } #endif XLOGPathInit(); /* set up shared memory and semaphores */ reset_shared(PostPortNumber); /* * Initialize the list of active backends. This list is only used for * garbage collecting the backend processes. */ BackendList = DLNewList(); PortList = DLNewList(); if (SilentMode) pmdaemonize(argc, argv); else { /* * create pid file. if the file has already existed, exits. */ SetPidFname(DataDir); if (SetPidFile(getpid()) == 0) { if (!CreateOptsFile(argc, argv)) { UnlinkPidFile(); ExitPostmaster(1); return 0; /* not reached */ } } else { ExitPostmaster(1); return 0; /* not reached */ } /* * register clean up proc */ on_proc_exit(UnlinkPidFile, 0); } /* * Set up signal handlers for the postmaster process. */ pqinitmask(); PG_SETMASK(&BlockSig); pqsignal(SIGHUP, SIGHUP_handler); /* reread config file and have children do same */ pqsignal(SIGINT, pmdie); /* send SIGTERM and ShutdownDataBase */ pqsignal(SIGQUIT, pmdie); /* send SIGUSR1 and die */ pqsignal(SIGTERM, pmdie); /* wait for children and ShutdownDataBase */ pqsignal(SIGALRM, SIG_IGN); /* ignored */ pqsignal(SIGPIPE, SIG_IGN); /* ignored */ pqsignal(SIGUSR1, SIG_IGN); /* ignored */ pqsignal(SIGUSR2, pmdie); /* send SIGUSR2, don't die */ pqsignal(SIGCHLD, reaper); /* handle child termination */ pqsignal(SIGTTIN, SIG_IGN); /* ignored */ pqsignal(SIGTTOU, SIG_IGN); /* ignored */ pqsignal(SIGWINCH, dumpstatus); /* dump port status */ StartupPID = StartupDataBase(); status = ServerLoop(); ExitPostmaster(status != STATUS_OK); return 0; /* not reached */ } static void pmdaemonize(int argc, char *argv[]) { int i; pid_t pid; SetPidFname(DataDir); pid = fork(); if (pid == -1) { perror("Failed to fork postmaster"); ExitPostmaster(1); return; /* not reached */ } else if (pid) { /* parent */ /* * create pid file. if the file has already existed, exits. */ if (SetPidFile(pid) == 0) { if (!CreateOptsFile(argc, argv)) { /* * Failed to create opts file. kill the child and exit * now. */ UnlinkPidFile(); kill(pid, SIGTERM); ExitPostmaster(1); return; /* not reached */ } _exit(0); } else { /* * Failed to create pid file. kill the child and exit now. */ kill(pid, SIGTERM); ExitPostmaster(1); return; /* not reached */ } } /* GH: If there's no setsid(), we hopefully don't need silent mode. * Until there's a better solution. */ #ifdef HAVE_SETSID if (setsid() < 0) { fprintf(stderr, "%s: ", progname); perror("cannot disassociate from controlling TTY"); exit(1); } #endif i = open(NULL_DEV, O_RDWR | PG_BINARY); dup2(i, 0); dup2(i, 1); dup2(i, 2); close(i); /* * register clean up proc */ on_proc_exit(UnlinkPidFile, 0); } /* * Print out help message */ static void usage(const char *progname) { printf("%s is the PostgreSQL server.\n\n", progname); printf("Usage:\n %s [options...]\n\n", progname); printf("Options:\n"); #ifdef USE_ASSERT_CHECKING printf(" -A 1|0 enable/disable run-time assert checking\n"); #endif printf(" -B NBUFFERS number of shared buffers (default %d)\n", DEF_NBUFFERS); printf(" -c NAME=VALUE set run-time parameter\n"); printf(" -d 1-5 debugging level\n"); printf(" -D DATADIR database directory\n"); printf(" -F turn fsync off\n"); printf(" -h HOSTNAME host name or IP address to listen on\n"); printf(" -i enable TCP/IP connections\n"); printf(" -k FILENAME Unix domain socket location\n"); #ifdef USE_SSL printf(" -l enable SSL connections\n"); #endif printf(" -N MAX-CONNECT maximum number of allowed connections (1..%d, default %d)\n", MAXBACKENDS, DEF_MAXBACKENDS); printf(" -o OPTIONS pass 'OPTIONS' to each backend server\n"); printf(" -p PORT port number to listen on (default %d)\n", DEF_PGPORT); printf(" -S silent mode (start in background without logging output)\n"); printf("\nDeveloper options:\n"); printf(" -n do not reinitialize shared memory after abnormal exit\n"); printf(" -s send SIGSTOP to all backend servers if one dies\n"); printf("\nPlease read the documentation for the complete list of run-time\n" "configuration settings and how to set them on the command line or in\n" "the configuration file.\n\n"); printf("Report bugs to .\n"); } static int ServerLoop(void) { fd_set readmask, writemask; int nSockets; Dlelem *curr; struct timeval now, later; struct timezone tz; gettimeofday(&now, &tz); nSockets = initMasks(&readmask, &writemask); for (;;) { Port *port; fd_set rmask, wmask; struct timeval *timeout = NULL; struct timeval timeout_tv; if (CheckPointPID == 0 && checkpointed && !FatalError) { time_t now = time(NULL); if (CheckPointTimeout + checkpointed > now) { timeout_tv.tv_sec = CheckPointTimeout + checkpointed - now; timeout_tv.tv_usec = 0; timeout = &timeout_tv; } else CheckPointPID = CheckPointDataBase(); } #ifdef USE_SSL /* * If we are using SSL, there may be input data already read and * pending in SSL's input buffers. If so, check for additional * input from other clients, but don't delay before processing. */ for (curr = DLGetHead(PortList); curr; curr = DLGetSucc(curr)) { Port *port = (Port *) DLE_VAL(curr); if (port->ssl && SSL_pending(port->ssl)) { timeout_tv.tv_sec = 0; timeout_tv.tv_usec = 0; timeout = &timeout_tv; break; } } #endif /* * Wait for something to happen. */ memcpy((char *) &rmask, (char *) &readmask, sizeof(fd_set)); memcpy((char *) &wmask, (char *) &writemask, sizeof(fd_set)); PG_SETMASK(&UnBlockSig); if (select(nSockets, &rmask, &wmask, (fd_set *) NULL, timeout) < 0) { PG_SETMASK(&BlockSig); if (errno == EINTR || errno == EWOULDBLOCK) continue; fprintf(stderr, "%s: ServerLoop: select failed: %s\n", progname, strerror(errno)); return STATUS_ERROR; } /* * Block all signals until we wait again */ PG_SETMASK(&BlockSig); /* * Respond to signals, if needed */ if (got_SIGHUP) { got_SIGHUP = false; ProcessConfigFile(PGC_SIGHUP); } /* * Select a random seed at the time of first receiving a request. */ while (random_seed == 0) { gettimeofday(&later, &tz); /* * We are not sure how much precision is in tv_usec, so we * swap the nibbles of 'later' and XOR them with 'now'. On the * off chance that the result is 0, we loop until it isn't. */ random_seed = now.tv_usec ^ ((later.tv_usec << 16) | ((later.tv_usec >> 16) & 0xffff)); } /* * new connection pending on our well-known port's socket? */ #ifdef HAVE_UNIX_SOCKETS if (ServerSock_UNIX != INVALID_SOCK && FD_ISSET(ServerSock_UNIX, &rmask) && (port = ConnCreate(ServerSock_UNIX)) != NULL) { PacketReceiveSetup(&port->pktInfo, readStartupPacket, (void *) port); } #endif if (ServerSock_INET != INVALID_SOCK && FD_ISSET(ServerSock_INET, &rmask) && (port = ConnCreate(ServerSock_INET)) != NULL) { PacketReceiveSetup(&port->pktInfo, readStartupPacket, (void *) port); } /* * Scan active ports, processing any available input. While we * are at it, build up new masks for next select(). */ nSockets = initMasks(&readmask, &writemask); curr = DLGetHead(PortList); while (curr) { Port *port = (Port *) DLE_VAL(curr); int status = STATUS_OK; Dlelem *next; if (FD_ISSET(port->sock, &rmask) #ifdef USE_SSL || (port->ssl && SSL_pending(port->ssl)) #endif ) { if (DebugLvl > 1) fprintf(stderr, "%s: ServerLoop:\t\thandling reading %d\n", progname, port->sock); if (PacketReceiveFragment(port) != STATUS_OK) status = STATUS_ERROR; } if (FD_ISSET(port->sock, &wmask)) { if (DebugLvl > 1) fprintf(stderr, "%s: ServerLoop:\t\thandling writing %d\n", progname, port->sock); if (PacketSendFragment(port) != STATUS_OK) status = STATUS_ERROR; } /* Get this before the connection might be closed. */ next = DLGetSucc(curr); /* * If there is no error and no outstanding data transfer going * on, then the authentication handshake must be complete to * the postmaster's satisfaction. So, start the backend. */ if (status == STATUS_OK && port->pktInfo.state == Idle) { /* * Can't start backend if max backend count is exceeded. * * The same when data base is in startup/shutdown mode. */ if (Shutdown > NoShutdown) PacketSendError(&port->pktInfo, "The Data Base System is shutting down"); else if (StartupPID) PacketSendError(&port->pktInfo, "The Data Base System is starting up"); else if (FatalError) PacketSendError(&port->pktInfo, "The Data Base System is in recovery mode"); else if (CountChildren() >= MaxBackends) PacketSendError(&port->pktInfo, "Sorry, too many clients already"); else { /* * If the backend start fails then keep the connection * open to report it. Otherwise, pretend there is an * error to close our descriptor for the connection, * which will now be managed by the backend. */ if (BackendStartup(port) != STATUS_OK) PacketSendError(&port->pktInfo, "Backend startup failed"); else status = STATUS_ERROR; } } /* Close the connection if required. */ if (status != STATUS_OK) { StreamClose(port->sock); DLRemove(curr); ConnFree(port); DLFreeElem(curr); } else { /* Set the masks for this connection. */ if (nSockets <= port->sock) nSockets = port->sock + 1; if (port->pktInfo.state == WritingPacket) FD_SET(port->sock, &writemask); else FD_SET(port->sock, &readmask); } curr = next; } /* loop over active ports */ } } /* * Initialise the read and write masks for select() for the well-known ports * we are listening on. Return the number of sockets to listen on. */ static int initMasks(fd_set *rmask, fd_set *wmask) { int nsocks = -1; FD_ZERO(rmask); FD_ZERO(wmask); #ifdef HAVE_UNIX_SOCKETS if (ServerSock_UNIX != INVALID_SOCK) { FD_SET(ServerSock_UNIX, rmask); if (ServerSock_UNIX > nsocks) nsocks = ServerSock_UNIX; } #endif if (ServerSock_INET != INVALID_SOCK) { FD_SET(ServerSock_INET, rmask); if (ServerSock_INET > nsocks) nsocks = ServerSock_INET; } return nsocks + 1; } /* * Called when the startup packet has been read. */ static int readStartupPacket(void *arg, PacketLen len, void *pkt) { Port *port; StartupPacket *si; port = (Port *) arg; si = (StartupPacket *) pkt; /* * The first field is either a protocol version number or a special * request code. */ port->proto = ntohl(si->protoVersion); if (port->proto == CANCEL_REQUEST_CODE) return processCancelRequest(port, len, pkt); if (port->proto == NEGOTIATE_SSL_CODE) { char SSLok; #ifdef USE_SSL /* No SSL when disabled or on Unix sockets */ if (!EnableSSL || port->laddr.sa.sa_family != AF_INET) SSLok = 'N'; else SSLok = 'S'; /* Support for SSL */ #else SSLok = 'N'; /* No support for SSL */ #endif if (send(port->sock, &SSLok, 1, 0) != 1) { perror("Failed to send SSL negotiation response"); return STATUS_ERROR; /* Close connection */ } #ifdef USE_SSL if (SSLok == 'S') { if (!(port->ssl = SSL_new(SSL_context)) || !SSL_set_fd(port->ssl, port->sock) || SSL_accept(port->ssl) <= 0) { fprintf(stderr, "Failed to initialize SSL connection: %s, errno: %d (%s)\n", ERR_reason_error_string(ERR_get_error()), errno, strerror(errno)); return STATUS_ERROR; } } #endif /* ready for the normal startup packet */ PacketReceiveSetup(&port->pktInfo, readStartupPacket, (void *) port); return STATUS_OK; /* Do not close connection */ } /* Could add additional special packet types here */ /* Check we can handle the protocol the frontend is using. */ if (PG_PROTOCOL_MAJOR(port->proto) < PG_PROTOCOL_MAJOR(PG_PROTOCOL_EARLIEST) || PG_PROTOCOL_MAJOR(port->proto) > PG_PROTOCOL_MAJOR(PG_PROTOCOL_LATEST) || (PG_PROTOCOL_MAJOR(port->proto) == PG_PROTOCOL_MAJOR(PG_PROTOCOL_LATEST) && PG_PROTOCOL_MINOR(port->proto) > PG_PROTOCOL_MINOR(PG_PROTOCOL_LATEST))) { PacketSendError(&port->pktInfo, "Unsupported frontend protocol."); return STATUS_OK; /* don't close the connection yet */ } /* * Get the parameters from the startup packet as C strings. The * packet destination was cleared first so a short packet has zeros * silently added and a long packet is silently truncated. */ StrNCpy(port->database, si->database, sizeof(port->database)); StrNCpy(port->user, si->user, sizeof(port->user)); StrNCpy(port->options, si->options, sizeof(port->options)); StrNCpy(port->tty, si->tty, sizeof(port->tty)); /* The database defaults to the user name. */ if (port->database[0] == '\0') StrNCpy(port->database, si->user, sizeof(port->database)); /* Check a user name was given. */ if (port->user[0] == '\0') { PacketSendError(&port->pktInfo, "No Postgres username specified in startup packet."); return STATUS_OK; /* don't close the connection yet */ } /* Start the authentication itself. */ be_recvauth(port); return STATUS_OK; /* don't close the connection yet */ } /* * The client has sent a cancel request packet, not a normal * start-a-new-backend packet. Perform the necessary processing. * Note that in any case, we return STATUS_ERROR to close the * connection immediately. Nothing is sent back to the client. */ static int processCancelRequest(Port *port, PacketLen len, void *pkt) { CancelRequestPacket *canc = (CancelRequestPacket *) pkt; int backendPID; long cancelAuthCode; Dlelem *curr; Backend *bp; backendPID = (int) ntohl(canc->backendPID); cancelAuthCode = (long) ntohl(canc->cancelAuthCode); if (backendPID == CheckPointPID) { if (DebugLvl) fprintf(stderr, "%s: processCancelRequest: CheckPointPID in cancel request for process %d\n", progname, backendPID); return STATUS_ERROR; } /* See if we have a matching backend */ for (curr = DLGetHead(BackendList); curr; curr = DLGetSucc(curr)) { bp = (Backend *) DLE_VAL(curr); if (bp->pid == backendPID) { if (bp->cancel_key == cancelAuthCode) { /* Found a match; signal that backend to cancel current op */ if (DebugLvl) fprintf(stderr, "%s: processCancelRequest: sending SIGINT to process %d\n", progname, bp->pid); kill(bp->pid, SIGINT); } else { /* Right PID, wrong key: no way, Jose */ if (DebugLvl) fprintf(stderr, "%s: processCancelRequest: bad key in cancel request for process %d\n", progname, bp->pid); } return STATUS_ERROR; } } /* No matching backend */ if (DebugLvl) fprintf(stderr, "%s: processCancelRequest: bad PID in cancel request for process %d\n", progname, backendPID); return STATUS_ERROR; } /* * ConnCreate -- create a local connection data structure */ static Port * ConnCreate(int serverFd) { Port *port; if (!(port = (Port *) calloc(1, sizeof(Port)))) { fprintf(stderr, "%s: ConnCreate: malloc failed\n", progname); SignalChildren(SIGUSR1); ExitPostmaster(1); } if (StreamConnection(serverFd, port) != STATUS_OK) { StreamClose(port->sock); ConnFree(port); port = NULL; } else { DLAddHead(PortList, DLNewElem(port)); RandomSalt(port->salt); port->pktInfo.state = Idle; } return port; } /* * ConnFree -- free a local connection data structure */ static void ConnFree(Port *conn) { #ifdef USE_SSL if (conn->ssl) SSL_free(conn->ssl); #endif free(conn); } /* * get_host_port -- return a pseudo port number (16 bits) * derived from the primary IP address of Virtual_host. */ static unsigned short get_host_port(void) { static unsigned short hostPort = 0; if (hostPort == 0) { SockAddr saddr; struct hostent *hp; hp = gethostbyname(Virtual_host); if ((hp == NULL) || (hp->h_addrtype != AF_INET)) { char msg[1024]; snprintf(msg, sizeof(msg), "FATAL: get_host_port: gethostbyname(%s) failed\n", Virtual_host); fputs(msg, stderr); pqdebug("%s", msg); exit(1); } memmove((char *) &(saddr.in.sin_addr), (char *) hp->h_addr, hp->h_length); hostPort = ntohl(saddr.in.sin_addr.s_addr) & 0xFFFF; } return hostPort; } /* * reset_shared -- reset shared memory and semaphores */ static void reset_shared(unsigned short port) { /* * A typical ipc_key is 5432001, which is port 5432, sequence * number 0, and 01 as the index in IPCKeyGetBufferMemoryKey(). * The 32-bit INT_MAX is 2147483 6 47. * * The default algorithm for calculating the IPC keys assumes that all * instances of postmaster on a given host are listening on different * ports. In order to work (prevent shared memory collisions) if you * run multiple PostgreSQL instances on the same port and different IP * addresses on a host, we change the algorithm if you give postmaster * the -h option, or set PGHOST, to a value other than the internal * default. * * If Virtual_host is set, then we generate the IPC keys using the * last two octets of the IP address instead of the port number. * This algorithm assumes that no one will run multiple PostgreSQL * instances on one host using two IP addresses that have the same two * last octets in different class C networks. If anyone does, it * would be rare. * * So, if you use -h or PGHOST, don't try to run two instances of * PostgreSQL on the same IP address but different ports. If you * don't use them, then you must use different ports (via -p or * PGPORT). And, of course, don't try to use both approaches on one * host. */ if (Virtual_host[0] != '\0') port = get_host_port(); ipc_key = port * 1000 + shmem_seq * 100; CreateSharedMemoryAndSemaphores(ipc_key, MaxBackends); shmem_seq += 1; if (shmem_seq >= 10) shmem_seq -= 10; } /* * Set flag if SIGHUP was detected so config file can be reread in * main loop */ static void SIGHUP_handler(SIGNAL_ARGS) { if (Shutdown > SmartShutdown) return; got_SIGHUP = true; SignalChildren(SIGHUP); } /* * pmdie -- signal handler for cleaning up after a kill signal. */ static void pmdie(SIGNAL_ARGS) { PG_SETMASK(&BlockSig); if (DebugLvl >= 1) elog(DEBUG, "pmdie %d", postgres_signal_arg); switch (postgres_signal_arg) { case SIGUSR2: /* * Send SIGUSR2 to all children (AsyncNotifyHandler) */ if (Shutdown > SmartShutdown) return; SignalChildren(SIGUSR2); return; case SIGTERM: /* * Smart Shutdown: * * let children to end their work and ShutdownDataBase. */ if (Shutdown >= SmartShutdown) return; Shutdown = SmartShutdown; tnow = time(NULL); fprintf(stderr, "Smart Shutdown request at %s", ctime(&tnow)); fflush(stderr); if (DLGetHead(BackendList)) /* let reaper() handle this */ return; /* * No children left. Shutdown data base system. */ if (StartupPID > 0 || FatalError) /* let reaper() handle * this */ return; if (ShutdownPID > 0) abort(); ShutdownPID = ShutdownDataBase(); return; case SIGINT: /* * Fast Shutdown: * * abort all children with SIGTERM (rollback active transactions * and exit) and ShutdownDataBase. */ if (Shutdown >= FastShutdown) return; tnow = time(NULL); fprintf(stderr, "Fast Shutdown request at %s", ctime(&tnow)); fflush(stderr); if (DLGetHead(BackendList)) /* let reaper() handle this */ { Shutdown = FastShutdown; if (!FatalError) { fprintf(stderr, "Aborting any active transaction...\n"); fflush(stderr); SignalChildren(SIGTERM); } return; } if (Shutdown > NoShutdown) { Shutdown = FastShutdown; return; } Shutdown = FastShutdown; /* * No children left. Shutdown data base system. */ if (StartupPID > 0 || FatalError) /* let reaper() handle * this */ return; if (ShutdownPID > 0) abort(); ShutdownPID = ShutdownDataBase(); return; case SIGQUIT: /* * Immediate Shutdown: * * abort all children with SIGUSR1 and exit without attempt to * properly shutdown data base system. */ tnow = time(NULL); fprintf(stderr, "Immediate Shutdown request at %s", ctime(&tnow)); fflush(stderr); if (ShutdownPID > 0) kill(ShutdownPID, SIGQUIT); else if (StartupPID > 0) kill(StartupPID, SIGQUIT); else if (DLGetHead(BackendList)) SignalChildren(SIGUSR1); break; } /* exit postmaster */ proc_exit(0); } /* * Reaper -- signal handler to cleanup after a backend (child) dies. */ static void reaper(SIGNAL_ARGS) { /* GH: replace waitpid for !HAVE_WAITPID. Does this work ? */ #ifdef HAVE_WAITPID int status; /* backend exit status */ #else union wait status; /* backend exit status */ #endif int exitstatus; int pid; /* process id of dead backend */ PG_SETMASK(&BlockSig); if (DebugLvl) fprintf(stderr, "%s: reaping dead processes...\n", progname); #ifdef HAVE_WAITPID while ((pid = waitpid(-1, &status, WNOHANG)) > 0) { exitstatus = status; #else while ((pid = wait3(&status, WNOHANG, NULL)) > 0) { exitstatus = status.w_status; #endif if (ShutdownPID > 0) { if (pid != ShutdownPID) abort(); if (exitstatus != 0) { fprintf(stderr, "Shutdown failed - abort\n"); fflush(stderr); proc_exit(1); } proc_exit(0); } if (StartupPID > 0) { if (pid != StartupPID) abort(); if (exitstatus != 0) { fprintf(stderr, "Startup failed - abort\n"); fflush(stderr); proc_exit(1); } StartupPID = 0; FatalError = false; if (Shutdown > NoShutdown) { if (ShutdownPID > 0) abort(); ShutdownPID = ShutdownDataBase(); } /* * Startup succeeded - remember its ID */ SetThisStartUpID(); CheckPointPID = 0; checkpointed = time(NULL); pqsignal(SIGCHLD, reaper); return; } CleanupProc(pid, exitstatus); } pqsignal(SIGCHLD, reaper); if (FatalError) { /* * Wait for all children exit then StartupDataBase. */ if (DLGetHead(BackendList)) return; if (StartupPID > 0 || ShutdownPID > 0) return; tnow = time(NULL); fprintf(stderr, "Server processes were terminated at %s" "Reinitializing shared memory and semaphores\n", ctime(&tnow)); fflush(stderr); shmem_exit(0); reset_shared(PostPortNumber); StartupPID = StartupDataBase(); return; } if (Shutdown > NoShutdown) { if (DLGetHead(BackendList)) return; if (StartupPID > 0 || ShutdownPID > 0) return; ShutdownPID = ShutdownDataBase(); } } /* * CleanupProc -- cleanup after terminated backend. * * Remove all local state associated with backend. * * Dillon's note: should log child's exit status in the system log. */ static void CleanupProc(int pid, int exitstatus) /* child's exit status. */ { Dlelem *curr, *next; Backend *bp; int sig; if (DebugLvl) { fprintf(stderr, "%s: CleanupProc: pid %d exited with status %d\n", progname, pid, exitstatus); } /* * If a backend dies in an ugly way (i.e. exit status not 0) then we * must signal all other backends to quickdie. If exit status is zero * we assume everything is hunky dory and simply remove the backend * from the active backend list. */ if (!exitstatus) { curr = DLGetHead(BackendList); while (curr) { bp = (Backend *) DLE_VAL(curr); if (bp->pid == pid) { DLRemove(curr); free(bp); DLFreeElem(curr); break; } curr = DLGetSucc(curr); } if (pid == CheckPointPID) { CheckPointPID = 0; checkpointed = time(NULL); } else ProcRemove(pid); return; } if (!FatalError) { tnow = time(NULL); fprintf(stderr, "Server process (pid %d) exited with status %d at %s" "Terminating any active server processes...\n", pid, exitstatus, ctime(&tnow)); fflush(stderr); } FatalError = true; curr = DLGetHead(BackendList); while (curr) { next = DLGetSucc(curr); bp = (Backend *) DLE_VAL(curr); /* * SIGUSR1 is the special signal that says exit without proc_exit * and let the user know what's going on. ProcSemaphoreKill() * cleans up the backends semaphore. If SendStop is set (-s on * command line), then we send a SIGSTOP so that we can core dumps * from all backends by hand. */ sig = (SendStop) ? SIGSTOP : SIGUSR1; if (bp->pid != pid) { if (DebugLvl) fprintf(stderr, "%s: CleanupProc: sending %s to process %d\n", progname, (sig == SIGUSR1) ? "SIGUSR1" : "SIGSTOP", bp->pid); kill(bp->pid, sig); } else { /* * I don't like that we call ProcRemove() here, assuming that * shmem may be corrupted! But is there another way to free * backend semaphores? Actually, I believe that we need not in * per backend semaphore at all (we use them to wait on lock * only, couldn't we just sigpause?), so probably we'll remove * this call from here someday. -- vadim 04-10-1999 */ if (pid == CheckPointPID) { CheckPointPID = 0; checkpointed = 0; } else ProcRemove(pid); DLRemove(curr); free(bp); DLFreeElem(curr); } curr = next; } } /* * Send a signal to all chidren processes. */ static void SignalChildren(int signal) { Dlelem *curr, *next; Backend *bp; int mypid = getpid(); curr = DLGetHead(BackendList); while (curr) { next = DLGetSucc(curr); bp = (Backend *) DLE_VAL(curr); if (bp->pid != mypid) { if (DebugLvl >= 1) elog(DEBUG, "SignalChildren: sending signal %d to process %d", signal, bp->pid); kill(bp->pid, signal); } curr = next; } } /* * BackendStartup -- start backend process * * returns: STATUS_ERROR if the fork/exec failed, STATUS_OK * otherwise. * */ static int BackendStartup(Port *port) { Backend *bn; /* for backend cleanup */ int pid; /* * Compute the cancel key that will be assigned to this backend. The * backend will have its own copy in the forked-off process' value of * MyCancelKey, so that it can transmit the key to the frontend. */ MyCancelKey = PostmasterRandom(); /* * Flush stdio channels just before fork, to avoid double-output * problems. Ideally we'd use fflush(NULL) here, but there are still a * few non-ANSI stdio libraries out there (like SunOS 4.1.x) that * coredump if we do. Presently stdout and stderr are the only stdio * output channels used by the postmaster, so fflush'ing them should * be sufficient. */ fflush(stdout); fflush(stderr); #ifdef __BEOS__ /* Specific beos actions before backend startup */ beos_before_backend_startup(); #endif if ((pid = fork()) == 0) { /* child */ #ifdef __BEOS__ /* Specific beos backend startup actions */ beos_backend_startup(); #endif #ifdef CYR_RECODE { /* Save charset for this host while we still have client addr */ char ChTable[80]; static char cyrEnvironment[100]; GetCharSetByHost(ChTable, port->raddr.in.sin_addr.s_addr, DataDir); if (*ChTable != '\0') { snprintf(cyrEnvironment, sizeof(cyrEnvironment), "PG_RECODETABLE=%s", ChTable); putenv(cyrEnvironment); } } #endif if (DoBackend(port)) { fprintf(stderr, "%s child[%d]: BackendStartup: backend startup failed\n", progname, (int) getpid()); exit(1); } else exit(0); } /* in parent */ if (pid < 0) { #ifdef __BEOS__ /* Specific beos backend startup actions */ beos_backend_startup_failed(); #endif fprintf(stderr, "%s: BackendStartup: fork failed: %s\n", progname, strerror(errno)); return STATUS_ERROR; } if (DebugLvl) fprintf(stderr, "%s: BackendStartup: pid %d user %s db %s socket %d\n", progname, pid, port->user, port->database, port->sock); /* * Everything's been successful, it's safe to add this backend to our * list of backends. */ if (!(bn = (Backend *) calloc(1, sizeof(Backend)))) { fprintf(stderr, "%s: BackendStartup: malloc failed\n", progname); ExitPostmaster(1); } bn->pid = pid; bn->cancel_key = MyCancelKey; DLAddHead(BackendList, DLNewElem(bn)); return STATUS_OK; } /* * split_opts -- split a string of options and append it to an argv array * * NB: the string is destructively modified! * * Since no current POSTGRES arguments require any quoting characters, * we can use the simple-minded tactic of assuming each set of space- * delimited characters is a separate argv element. * * If you don't like that, well, we *used* to pass the whole option string * as ONE argument to execl(), which was even less intelligent... */ static void split_opts(char **argv, int *argcp, char *s) { while (s && *s) { while (isspace((int) *s)) ++s; if (*s == '\0') break; argv[(*argcp)++] = s; while (*s && !isspace((int) *s)) ++s; if (*s) *s++ = '\0'; } } /* * DoBackend -- set up the backend's argument list and invoke backend main(). * * This used to perform an execv() but we no longer exec the backend; * it's the same executable as the postmaster. * * returns: * Shouldn't return at all. * If PostgresMain() fails, return status. */ static int DoBackend(Port *port) { char *av[ARGV_SIZE * 2]; int ac = 0; char debugbuf[ARGV_SIZE]; char protobuf[ARGV_SIZE]; char dbbuf[ARGV_SIZE]; char optbuf[ARGV_SIZE]; char ttybuf[ARGV_SIZE]; int i; struct timeval now; struct timezone tz; /* * Let's clean up ourselves as the postmaster child */ /* We don't want the postmaster's proc_exit() handlers */ on_exit_reset(); /* * Signal handlers setting is moved to tcop/postgres... */ /* Close the postmaster sockets */ if (NetServer) StreamClose(ServerSock_INET); ServerSock_INET = INVALID_SOCK; #ifdef HAVE_UNIX_SOCKETS StreamClose(ServerSock_UNIX); ServerSock_UNIX = INVALID_SOCK; #endif /* Save port etc. for ps status */ MyProcPort = port; /* Reset MyProcPid to new backend's pid */ MyProcPid = getpid(); /* * Don't want backend to be able to see the postmaster random number * generator state. We have to clobber the static random_seed *and* * start a new random sequence in the random() library function. */ random_seed = 0; gettimeofday(&now, &tz); srandom((unsigned int) now.tv_usec); /* ---------------- * Now, build the argv vector that will be given to PostgresMain. * * The layout of the command line is * postgres [secure switches] -p databasename [insecure switches] * where the switches after -p come from the client request. * ---------------- */ av[ac++] = "postgres"; /* * Pass the requested debugging level along to the backend. Level one * debugging in the postmaster traces postmaster connection activity, * and levels two and higher are passed along to the backend. This * allows us to watch only the postmaster or the postmaster and the * backend. */ if (DebugLvl > 1) { sprintf(debugbuf, "-d%d", DebugLvl); av[ac++] = debugbuf; } /* * Pass any backend switches specified with -o in the postmaster's own * command line. We assume these are secure. (It's OK to mangle * ExtraOptions since we are now in the child process; this won't * change the postmaster's copy.) */ split_opts(av, &ac, ExtraOptions); /* Tell the backend what protocol the frontend is using. */ sprintf(protobuf, "-v%u", port->proto); av[ac++] = protobuf; /* * Tell the backend it is being called from the postmaster, and which * database to use. -p marks the end of secure switches. */ av[ac++] = "-p"; StrNCpy(dbbuf, port->database, ARGV_SIZE); av[ac++] = dbbuf; /* * Pass the (insecure) option switches from the connection request. */ StrNCpy(optbuf, port->options, ARGV_SIZE); split_opts(av, &ac, optbuf); /* * Pass the (insecure) debug output file request. * * NOTE: currently, this is useless code, since the backend will not * honor an insecure -o switch. I left it here since the backend * could be modified to allow insecure -o, given adequate checking * that the specified filename is something safe to write on. */ if (port->tty[0]) { StrNCpy(ttybuf, port->tty, ARGV_SIZE); av[ac++] = "-o"; av[ac++] = ttybuf; } av[ac] = (char *) NULL; /* * Release postmaster's working memory context so that backend can * recycle the space. Note we couldn't do it earlier than here, * because port pointer is pointing into that space! But now we * have copied all the interesting info into safe local storage. */ MemoryContextSwitchTo(TopMemoryContext); MemoryContextDelete(PostmasterContext); PostmasterContext = NULL; /* * Debug: print arguments being passed to backend */ if (DebugLvl > 1) { fprintf(stderr, "%s child[%d]: starting with (", progname, MyProcPid); for (i = 0; i < ac; ++i) fprintf(stderr, "%s ", av[i]); fprintf(stderr, ")\n"); } return (PostgresMain(ac, av, real_argc, real_argv, port->user)); } /* * ExitPostmaster -- cleanup */ static void ExitPostmaster(int status) { /* should cleanup shared memory and kill all backends */ /* * Not sure of the semantics here. When the Postmaster dies, should * the backends all be killed? probably not. * * MUST -- vadim 05-10-1999 */ if (ServerSock_INET != INVALID_SOCK) StreamClose(ServerSock_INET); ServerSock_INET = INVALID_SOCK; #ifdef HAVE_UNIX_SOCKETS if (ServerSock_UNIX != INVALID_SOCK) StreamClose(ServerSock_UNIX); ServerSock_UNIX = INVALID_SOCK; #endif proc_exit(status); } static void dumpstatus(SIGNAL_ARGS) { Dlelem *curr; PG_SETMASK(&BlockSig); curr = DLGetHead(PortList); while (curr) { Port *port = DLE_VAL(curr); fprintf(stderr, "%s: dumpstatus:\n", progname); fprintf(stderr, "\tsock %d\n", port->sock); curr = DLGetSucc(curr); } } /* * CharRemap */ static char CharRemap(long int ch) { if (ch < 0) ch = -ch; ch = ch % 62; if (ch < 26) return 'A' + ch; ch -= 26; if (ch < 26) return 'a' + ch; ch -= 26; return '0' + ch; } /* * RandomSalt */ static void RandomSalt(char *salt) { long rand = PostmasterRandom(); *salt = CharRemap(rand % 62); *(salt + 1) = CharRemap(rand / 62); } /* * PostmasterRandom */ static long PostmasterRandom(void) { static bool initialized = false; if (!initialized) { Assert(random_seed != 0); srandom(random_seed); initialized = true; } return random() ^ random_seed; } /* * Count up number of child processes. */ static int CountChildren(void) { Dlelem *curr; Backend *bp; int mypid = getpid(); int cnt = 0; for (curr = DLGetHead(BackendList); curr; curr = DLGetSucc(curr)) { bp = (Backend *) DLE_VAL(curr); if (bp->pid != mypid) cnt++; } if (CheckPointPID != 0) cnt--; return cnt; } #ifdef USE_SSL /* * Initialize SSL library and structures */ static void InitSSL(void) { char fnbuf[2048]; SSL_load_error_strings(); SSL_library_init(); SSL_context = SSL_CTX_new(SSLv23_method()); if (!SSL_context) { fprintf(stderr, "Failed to create SSL context: %s\n", ERR_reason_error_string(ERR_get_error())); exit(1); } snprintf(fnbuf, sizeof(fnbuf), "%s/server.crt", DataDir); if (!SSL_CTX_use_certificate_file(SSL_context, fnbuf, SSL_FILETYPE_PEM)) { fprintf(stderr, "Failed to load server certificate (%s): %s\n", fnbuf, ERR_reason_error_string(ERR_get_error())); exit(1); } snprintf(fnbuf, sizeof(fnbuf), "%s/server.key", DataDir); if (!SSL_CTX_use_PrivateKey_file(SSL_context, fnbuf, SSL_FILETYPE_PEM)) { fprintf(stderr, "Failed to load private key file (%s): %s\n", fnbuf, ERR_reason_error_string(ERR_get_error())); exit(1); } if (!SSL_CTX_check_private_key(SSL_context)) { fprintf(stderr, "Check of private key failed: %s\n", ERR_reason_error_string(ERR_get_error())); exit(1); } } #endif static pid_t SSDataBase(int xlop) { pid_t pid; Backend *bn; fflush(stdout); fflush(stderr); if ((pid = fork()) == 0) /* child */ { char *av[ARGV_SIZE * 2]; int ac = 0; char nbbuf[ARGV_SIZE]; char dbbuf[ARGV_SIZE]; char xlbuf[ARGV_SIZE]; /* Lose the postmaster's on-exit routines and port connections */ on_exit_reset(); if (NetServer) StreamClose(ServerSock_INET); ServerSock_INET = INVALID_SOCK; #ifdef HAVE_UNIX_SOCKETS StreamClose(ServerSock_UNIX); ServerSock_UNIX = INVALID_SOCK; #endif av[ac++] = "postgres"; av[ac++] = "-d"; sprintf(nbbuf, "-B%u", NBuffers); av[ac++] = nbbuf; sprintf(xlbuf, "-x %d", xlop); av[ac++] = xlbuf; av[ac++] = "-p"; StrNCpy(dbbuf, "template1", ARGV_SIZE); av[ac++] = dbbuf; av[ac] = (char *) NULL; optind = 1; pqsignal(SIGQUIT, SIG_DFL); #ifdef HAVE_SIGPROCMASK sigdelset(&BlockSig, SIGQUIT); #else BlockSig &= ~(sigmask(SIGQUIT)); #endif PG_SETMASK(&BlockSig); BootstrapMain(ac, av); exit(0); } /* in parent */ if (pid < 0) { fprintf(stderr, "%s Data Base: fork failed: %s\n", ((xlop == BS_XLOG_STARTUP) ? "Startup" : ((xlop == BS_XLOG_CHECKPOINT) ? "CheckPoint" : "Shutdown")), strerror(errno)); ExitPostmaster(1); } if (xlop != BS_XLOG_CHECKPOINT) return(pid); if (!(bn = (Backend *) calloc(1, sizeof(Backend)))) { fprintf(stderr, "%s: CheckPointDataBase: malloc failed\n", progname); ExitPostmaster(1); } bn->pid = pid; bn->cancel_key = 0; DLAddHead(BackendList, DLNewElem(bn)); return (pid); } /* * Create the opts file */ static bool CreateOptsFile(int argc, char *argv[]) { char fullprogname[MAXPGPATH]; char *filename; FILE *fp; unsigned i; if (FindExec(fullprogname, argv[0], "postmaster") == -1) return false; filename = palloc(strlen(DataDir) + 20); sprintf(filename, "%s/postmaster.opts", DataDir); fp = fopen(filename, "w"); if (fp == NULL) { fprintf(stderr, "%s: cannot create file %s: %s\n", progname, filename, strerror(errno)); return false; } fprintf(fp, "%s", fullprogname); for (i = 1; i < argc; i++) fprintf(fp, " '%s'", argv[i]); fputs("\n", fp); if (ferror(fp)) { fprintf(stderr, "%s: writing file %s failed\n", progname, filename); fclose(fp); return false; } fclose(fp); return true; }