+++ /dev/null
-/*
- * WebCit "system dependent" code.
- *
- * Copyright (c) 1996-2021 by the citadel.org team
- *
- * This program is open source software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 3.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
-
-#include "sysdep.h"
-#include <stdlib.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <fcntl.h>
-#include <ctype.h>
-#include <signal.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/wait.h>
-#include <sys/socket.h>
-#include <syslog.h>
-#include <sys/syslog.h>
-#include <time.h>
-#include <limits.h>
-#include <sys/resource.h>
-#include <netinet/in.h>
-#include <netinet/tcp.h>
-#include <arpa/inet.h>
-#include <netdb.h>
-#include <sys/un.h>
-#include <string.h>
-#include <pwd.h>
-#include <errno.h>
-#include <stdarg.h>
-#include <grp.h>
-#ifdef HAVE_PTHREAD_H
-#include <pthread.h>
-#endif
-#include "webcit.h"
-#include "sysdep.h"
-
-#ifdef HAVE_SYS_SELECT_H
-#include <sys/select.h>
-#endif
-
-#include "webserver.h"
-#include "modules_init.h"
-#if HAVE_BACKTRACE
-#include <execinfo.h>
-#endif
-
-pthread_mutex_t Critters[MAX_SEMAPHORES]; /* Things needing locking */
-pthread_key_t MyConKey; /* TSD key for MyContext() */
-pthread_key_t MyReq; /* TSD key for MyReq() */
-int msock; /* master listening socket */
-int time_to_die = 0; /* Nonzero if server is shutting down */
-
-extern void *context_loop(ParsedHttpHdrs *Hdr);
-extern void *housekeeping_loop(void);
-extern void do_housekeeping(void);
-
-char file_etc_mimelist[PATH_MAX]="";
-
-char etc_dir[PATH_MAX];
-char static_dir[PATH_MAX]; /* calculated on startup */
-char static_local_dir[PATH_MAX]; /* calculated on startup */
-char static_icon_dir[PATH_MAX]; /* where should we find our mime icons? */
-char *static_dirs[]={ /* needs same sort order as the web mapping */
- "./static",
- "./static.local",
- "./tiny_mce",
- "./static/webcit_icons"
-};
-
-int ExitPipe[2];
-HashList *GZMimeBlackList = NULL; /* mimetypes which shouldn't be gzip compressed */
-
-void LoadMimeBlacklist(void)
-{
- StrBuf *MimeBlackLine;
- IOBuffer IOB;
- eReadState state;
-
- memset(&IOB, 0, sizeof(IOBuffer));
- IOB.fd = open(file_etc_mimelist, O_RDONLY);
-
- IOB.Buf = NewStrBuf();
- MimeBlackLine = NewStrBuf();
- GZMimeBlackList = NewHash(1, NULL);
-
- do
- {
- state = StrBufChunkSipLine(MimeBlackLine, &IOB);
-
- switch (state)
- {
- case eMustReadMore:
- if (StrBuf_read_one_chunk_callback(IOB.fd, 0, &IOB) <= 0)
- state = eReadFail;
- break;
- case eReadSuccess:
- if ((StrLength(MimeBlackLine) > 1) &&
- (*ChrPtr(MimeBlackLine) != '#'))
- {
- Put(GZMimeBlackList, SKEY(MimeBlackLine),
- (void*) 1, reference_free_handler);
- }
- FlushStrBuf(MimeBlackLine);
- break;
- case eReadFail:
- break;
- case eBufferNotEmpty:
- break;
- }
- }
- while (state != eReadFail);
-
- close(IOB.fd);
-
- FreeStrBuf(&IOB.Buf);
- FreeStrBuf(&MimeBlackLine);
-}
-
-void CheckGZipCompressionAllowed(const char *MimeType, long MLen)
-{
- void *v;
-
- if (WC->Hdr->HR.gzip_ok)
- WC->Hdr->HR.gzip_ok = GetHash(GZMimeBlackList, MimeType, MLen, &v) == 0;
-}
-
-void InitialiseSemaphores(void)
-{
- int i;
-
- /* Set up a bunch of semaphores to be used for critical sections */
- for (i=0; i<MAX_SEMAPHORES; ++i) {
- pthread_mutex_init(&Critters[i], NULL);
- }
-
- if (pipe(ExitPipe))
- {
- syslog(LOG_WARNING, "Failed to open exit pipe: %d [%s]\n",
- errno,
- strerror(errno));
-
- exit(-1);
- }
-}
-
-/*
- * Obtain a semaphore lock to begin a critical section.
- */
-void begin_critical_section(int which_one)
-{
- pthread_mutex_lock(&Critters[which_one]);
-}
-
-/*
- * Release a semaphore lock to end a critical section.
- */
-void end_critical_section(int which_one)
-{
- pthread_mutex_unlock(&Critters[which_one]);
-}
-
-
-void ShutDownWebcit(void)
-{
-
- DeleteHash(&GZMimeBlackList);
- free_zone_directory ();
- icaltimezone_release_zone_tab ();
- icalmemory_free_ring ();
- ShutDownLibCitadel ();
- shutdown_modules ();
-}
-
-/*
- * Entry point for worker threads
- */
-void worker_entry(void)
-{
- int ssock;
- int i = 0;
- int fail_this_transaction = 0;
- ParsedHttpHdrs Hdr;
-
- memset(&Hdr, 0, sizeof(ParsedHttpHdrs));
- Hdr.HR.eReqType = eGET;
- http_new_modules(&Hdr);
-
- do {
- /* Each worker thread blocks on accept() while waiting for something to do. */
- fail_this_transaction = 0;
- ssock = -1;
- errno = EAGAIN;
- do {
- fd_set wset;
- --num_threads_executing;
- FD_ZERO(&wset);
- FD_SET(msock, &wset);
- FD_SET(ExitPipe[1], &wset);
-
- select(msock + 1, NULL, &wset, NULL, NULL);
- if (time_to_die)
- break;
-
- ssock = accept(msock, NULL, 0);
- ++num_threads_executing;
- if (ssock < 0) fail_this_transaction = 1;
- } while ((msock > 0) && (ssock < 0) && (time_to_die == 0));
-
- if ((msock == -1)||(time_to_die))
- {/* ok, we're going down. */
- int shutdown = 0;
-
- /* The first thread to get here will have to do the cleanup.
- * Make sure it's really just one.
- */
- begin_critical_section(S_SHUTDOWN);
- if (msock == -1)
- {
- msock = -2;
- shutdown = 1;
- }
- end_critical_section(S_SHUTDOWN);
- if (shutdown == 1)
- {/* we're the one to cleanup the mess. */
- http_destroy_modules(&Hdr);
- syslog(LOG_DEBUG, "I'm master shutdown: tagging sessions to be killed.\n");
- shutdown_sessions();
- syslog(LOG_DEBUG, "master shutdown: waiting for others\n");
- sleeeeeeeeeep(1); /* wait so some others might finish... */
- syslog(LOG_DEBUG, "master shutdown: cleaning up sessions\n");
- do_housekeeping();
- syslog(LOG_DEBUG, "master shutdown: cleaning up libical\n");
-
- ShutDownWebcit();
-
- syslog(LOG_DEBUG, "master shutdown exiting.\n");
- exit(0);
- }
- break;
- }
- if (ssock < 0 ) continue;
-
- check_thread_pool_size();
-
- /* Now do something. */
- if (msock < 0) {
- if (ssock > 0) close (ssock);
- syslog(LOG_DEBUG, "in between.");
- pthread_exit(NULL);
- } else {
- /* Got it? do some real work! */
- /* Set the SO_REUSEADDR socket option */
- i = 1;
- setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
-
- /* If we are an HTTPS server, go crypto now. */
-#ifdef HAVE_OPENSSL
- if (is_https) {
- if (starttls(ssock) != 0) {
- fail_this_transaction = 1;
- close(ssock);
- }
- }
- else
-#endif
- {
- int fdflags;
- fdflags = fcntl(ssock, F_GETFL);
- if (fdflags < 0)
- syslog(LOG_WARNING, "unable to get server socket flags! %s \n",
- strerror(errno));
- fdflags = fdflags | O_NONBLOCK;
- if (fcntl(ssock, F_SETFL, fdflags) < 0)
- syslog(LOG_WARNING, "unable to set server socket nonblocking flags! %s \n",
- strerror(errno));
- }
-
- if (fail_this_transaction == 0) {
- Hdr.http_sock = ssock;
-
- /* Perform an HTTP transaction... */
- context_loop(&Hdr);
-
- /* Shut down SSL/TLS if required... */
-#ifdef HAVE_OPENSSL
- if (is_https) {
- endtls();
- }
-#endif
-
- /* ...and close the socket. */
- if (Hdr.http_sock > 0) {
- lingering_close(ssock);
- }
- http_detach_modules(&Hdr);
-
- }
-
- }
-
- } while (!time_to_die);
-
- http_destroy_modules(&Hdr);
- syslog(LOG_DEBUG, "Thread exiting.\n");
- pthread_exit(NULL);
-}
-
-
-/*
- * Shut us down the regular way.
- * signum is the signal we want to forward
- */
-pid_t current_child;
-void graceful_shutdown_watcher(int signum) {
- syslog(LOG_INFO, "Watcher thread exiting.\n");
- write(ExitPipe[0], HKEY(" "));
- kill(current_child, signum);
- if (signum != SIGHUP)
- exit(0);
-}
-
-
-/*
- * Shut us down the regular way.
- * signum is the signal we want to forward
- */
-pid_t current_child;
-void graceful_shutdown(int signum) {
- FILE *FD;
- int fd;
-
- syslog(LOG_INFO, "WebCit is being shut down on signal %d.\n", signum);
- fd = msock;
- msock = -1;
- time_to_die = 1;
- FD=fdopen(fd, "a+");
- fflush (FD);
- fclose (FD);
- close(fd);
- write(ExitPipe[0], HKEY(" "));
-}
-
-
-/*
- * Start running as a daemon.
- */
-void start_daemon(char *pid_file)
-{
- int status = 0;
- pid_t child = 0;
- FILE *fp;
- int do_restart = 0;
-
- current_child = 0;
-
- /* Close stdin/stdout/stderr and replace them with /dev/null.
- * We don't just call close() because we don't want these fd's
- * to be reused for other files.
- */
- chdir("/");
-
- signal(SIGHUP, SIG_IGN);
- signal(SIGINT, SIG_IGN);
- signal(SIGQUIT, SIG_IGN);
-
- child = fork();
- if (child != 0) {
- exit(0);
- }
-
- setsid();
- umask(0);
- freopen("/dev/null", "r", stdin);
- freopen("/dev/null", "w", stdout);
- freopen("/dev/null", "w", stderr);
- signal(SIGTERM, graceful_shutdown_watcher);
- signal(SIGHUP, graceful_shutdown_watcher);
-
- do {
- current_child = fork();
-
-
- if (current_child < 0) {
- perror("fork");
- ShutDownLibCitadel ();
- exit(errno);
- }
-
- else if (current_child == 0) { /* child process */
- signal(SIGHUP, graceful_shutdown);
-
- return; /* continue starting webcit. */
- }
- else { /* watcher process */
- if (pid_file) {
- fp = fopen(pid_file, "w");
- if (fp != NULL) {
- fprintf(fp, "%d\n", getpid());
- fclose(fp);
- }
- }
- waitpid(current_child, &status, 0);
- }
-
- do_restart = 0;
-
- /* Did the main process exit with an actual exit code? */
- if (WIFEXITED(status)) {
-
- /* Exit code 0 means the watcher should exit */
- if (WEXITSTATUS(status) == 0) {
- do_restart = 0;
- }
-
- /* Exit code 101-109 means the watcher should exit */
- else if ( (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109) ) {
- do_restart = 0;
- }
-
- /* Any other exit code means we should restart. */
- else {
- do_restart = 1;
- }
- }
-
- /* Any other type of termination (signals, etc.) should also restart. */
- else {
- do_restart = 1;
- }
-
- } while (do_restart);
-
- if (pid_file) {
- unlink(pid_file);
- }
- ShutDownLibCitadel ();
- exit(WEXITSTATUS(status));
-}
-
-
-/*
- * Spawn an additional worker thread into the pool.
- */
-void spawn_another_worker_thread()
-{
- pthread_t SessThread; /* Thread descriptor */
- pthread_attr_t attr; /* Thread attributes */
- int ret;
-
- ++num_threads_existing;
- ++num_threads_executing;
-
- /* set attributes for the new thread */
- pthread_attr_init(&attr);
- pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
-
- /*
- * Our per-thread stacks need to be bigger than the default size,
- * otherwise the MIME parser crashes on FreeBSD.
- */
- if ((ret = pthread_attr_setstacksize(&attr, 1024 * 1024))) {
- syslog(LOG_WARNING, "pthread_attr_setstacksize: %s\n", strerror(ret));
- pthread_attr_destroy(&attr);
- }
-
- /* now create the thread */
- if (pthread_create(&SessThread, &attr, (void *(*)(void *)) worker_entry, NULL) != 0) {
- syslog(LOG_WARNING, "Can't create thread: %s\n", strerror(errno));
- }
-
- /* free up the attributes */
- pthread_attr_destroy(&attr);
-}
-
-
-void
-webcit_calc_dirs_n_files(int relh, const char *basedir, int home, char *webcitdir, char *relhome)
-{
- char dirbuffer[PATH_MAX]="";
- /* calculate all our path on a central place */
- /* where to keep our config */
-
-#define COMPUTE_DIRECTORY(SUBDIR) memcpy(dirbuffer,SUBDIR, sizeof dirbuffer);\
- snprintf(SUBDIR,sizeof SUBDIR, "%s%s%s%s%s%s%s", \
- (home&!relh)?webcitdir:basedir, \
- ((basedir!=webcitdir)&(home&!relh))?basedir:"/", \
- ((basedir!=webcitdir)&(home&!relh))?"/":"", \
- relhome, \
- (relhome[0]!='\0')?"/":"",\
- dirbuffer,\
- (dirbuffer[0]!='\0')?"/":"");
- basedir=RUNDIR;
- COMPUTE_DIRECTORY(socket_dir);
- basedir=WWWDIR "/static";
- COMPUTE_DIRECTORY(static_dir);
- basedir=WWWDIR "/static/icons";
- COMPUTE_DIRECTORY(static_icon_dir);
- basedir=WWWDIR "/static.local";
- COMPUTE_DIRECTORY(static_local_dir);
- StripSlashes(static_dir, 1);
- StripSlashes(static_icon_dir, 1);
- StripSlashes(static_local_dir, 1);
-
- basedir=ETCDIR;
- COMPUTE_DIRECTORY(etc_dir);
- StripSlashes(etc_dir, 1);
- snprintf(file_etc_mimelist,
- sizeof file_etc_mimelist,
- "%s/nogz-mimetypes.txt",
- etc_dir);
-
- /* we should go somewhere we can leave our coredump, if enabled... */
- syslog(LOG_INFO, "Changing directory to %s\n", socket_dir);
- if (chdir(webcitdir) != 0) {
- perror("chdir");
- }
-}
-
-void drop_root(uid_t UID)
-{
- struct passwd pw, *pwp = NULL;
-#ifdef HAVE_GETPWUID_R
- char pwbuf[SIZ];
-#endif
-
- /*
- * Now that we've bound the sockets, change to the Citadel user id and its
- * corresponding group ids
- */
- if (UID != -1) {
-
-#ifdef HAVE_GETPWUID_R
-#ifdef SOLARIS_GETPWUID
- pwp = getpwuid_r(UID, &pw, pwbuf, sizeof(pwbuf));
-#else /* SOLARIS_GETPWUID */
- getpwuid_r(UID, &pw, pwbuf, sizeof(pwbuf), &pwp);
-#endif /* SOLARIS_GETPWUID */
-#else /* HAVE_GETPWUID_R */
- pwp = NULL;
-#endif /* HAVE_GETPWUID_R */
-
- if (pwp == NULL)
- syslog(LOG_CRIT, "WARNING: getpwuid(%d): %s\n"
- "Group IDs will be incorrect.\n", UID,
- strerror(errno));
- else {
- initgroups(pw.pw_name, pw.pw_gid);
- if (setgid(pw.pw_gid))
- syslog(LOG_CRIT, "setgid(%ld): %s\n", (long)pw.pw_gid,
- strerror(errno));
- }
- syslog(LOG_INFO, "Changing uid to %ld\n", (long)UID);
- if (setuid(UID) != 0) {
- syslog(LOG_CRIT, "setuid() failed: %s\n", strerror(errno));
- }
-#if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
- prctl(PR_SET_DUMPABLE, 1);
-#endif
- }
-}
-
-
-/*
- * print the actual stack frame.
- */
-void wc_backtrace(long LogLevel)
-{
-#ifdef HAVE_BACKTRACE
- void *stack_frames[50];
- size_t size, i;
- char **strings;
-
-
- size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
- strings = backtrace_symbols(stack_frames, size);
- for (i = 0; i < size; i++) {
- if (strings != NULL)
- syslog(LogLevel, "%s\n", strings[i]);
- else
- syslog(LogLevel, "%p\n", stack_frames[i]);
- }
- free(strings);
-#endif
-}
projects / citadel.git / blobdiff