+++ /dev/null
-// Citadel "system dependent" stuff.
-//
-// Here's where we (hopefully) have most parts of the Citadel server that
-// might need tweaking when run on different operating system variants.
-//
-// Copyright (c) 1987-2021 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 <sys/stat.h>
-#include <errno.h>
-#include <signal.h>
-#include <stdio.h>
-#include <syslog.h>
-#include <sys/syslog.h>
-#include <execinfo.h>
-#include <netdb.h>
-#include <sys/un.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <netinet/tcp.h>
-#include <arpa/inet.h>
-#define SHOW_ME_VAPPEND_PRINTF
-#include <libcitadel.h>
-#include "citserver.h"
-#include "config.h"
-#include "ctdl_module.h"
-#include "sysdep_decls.h"
-#include "modules/crypto/serv_crypto.h" // Needed for init_ssl, client_write_ssl, client_read_ssl
-#include "housekeeping.h"
-#include "context.h"
-
-// Signal handler to shut down the server.
-volatile int exit_signal = 0;
-volatile int shutdown_and_halt = 0;
-volatile int restart_server = 0;
-volatile int running_as_daemon = 0;
-
-
-static RETSIGTYPE signal_cleanup(int signum) {
- syslog(LOG_DEBUG, "sysdep: caught signal %d", signum);
- exit_signal = signum;
- server_shutting_down = 1;
-}
-
-
-// Some initialization stuff...
-void init_sysdep(void) {
- sigset_t set;
-
- // Avoid vulnerabilities related to FD_SETSIZE if we can.
-#ifdef FD_SETSIZE
-#ifdef RLIMIT_NOFILE
- struct rlimit rl;
- getrlimit(RLIMIT_NOFILE, &rl);
- rl.rlim_cur = FD_SETSIZE;
- rl.rlim_max = FD_SETSIZE;
- setrlimit(RLIMIT_NOFILE, &rl);
-#endif
-#endif
-
- // If we've got OpenSSL, we're going to use it.
-#ifdef HAVE_OPENSSL
- init_ssl();
-#endif
-
- if (pthread_key_create(&ThreadKey, NULL) != 0) { // TSD for threads
- syslog(LOG_ERR, "pthread_key_create() : %m");
- abort();
- }
-
- if (pthread_key_create(&MyConKey, NULL) != 0) { // TSD for sessions
- syslog(LOG_CRIT, "sysdep: can't create TSD key: %m");
- abort();
- }
-
- // Interript, hangup, and terminate signals should cause the server to shut down.
- sigemptyset(&set);
- sigaddset(&set, SIGINT);
- sigaddset(&set, SIGHUP);
- sigaddset(&set, SIGTERM);
- sigprocmask(SIG_UNBLOCK, &set, NULL);
-
- signal(SIGINT, signal_cleanup);
- signal(SIGHUP, signal_cleanup);
- signal(SIGTERM, signal_cleanup);
-
- // Do not shut down the server on broken pipe signals, otherwise the
- // whole Citadel service would come down whenever a single client
- // socket breaks.
- signal(SIGPIPE, SIG_IGN);
-}
-
-
-// This is a generic function to set up a master socket for listening on
-// a TCP port. The server shuts down if the bind fails. (IPv4/IPv6 version)
-//
-// ip_addr IP address to bind
-// port_number port number to bind
-// queue_len number of incoming connections to allow in the queue
-int ctdl_tcp_server(char *ip_addr, int port_number, int queue_len) {
- struct protoent *p;
- struct sockaddr_in6 sin6;
- struct sockaddr_in sin4;
- int s, i, b;
- int ip_version = 6;
-
- memset(&sin6, 0, sizeof(sin6));
- memset(&sin4, 0, sizeof(sin4));
- sin6.sin6_family = AF_INET6;
- sin4.sin_family = AF_INET;
-
- if ( (ip_addr == NULL) // any IPv6
- || (IsEmptyStr(ip_addr))
- || (!strcmp(ip_addr, "*"))
- ) {
- ip_version = 6;
- sin6.sin6_addr = in6addr_any;
- }
- else if (!strcmp(ip_addr, "0.0.0.0")) // any IPv4
- {
- ip_version = 4;
- sin4.sin_addr.s_addr = INADDR_ANY;
- }
- else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':'))) // specific IPv4
- {
- ip_version = 4;
- if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
- syslog(LOG_ALERT, "tcpserver: inet_pton: %m");
- return (-1);
- }
- }
- else // specific IPv6
- {
- ip_version = 6;
- if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
- syslog(LOG_ALERT, "tcpserver: inet_pton: %m");
- return (-1);
- }
- }
-
- if (port_number == 0) {
- syslog(LOG_ALERT, "tcpserver: no port number was specified");
- return (-1);
- }
- sin6.sin6_port = htons((u_short) port_number);
- sin4.sin_port = htons((u_short) port_number);
-
- p = getprotobyname("tcp");
- if (p == NULL) {
- syslog(LOG_ALERT, "tcpserver: getprotobyname: %m");
- return (-1);
- }
-
- s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
- if (s < 0) {
- syslog(LOG_ALERT, "tcpserver: socket: %m");
- return (-1);
- }
- // Set some socket options that make sense.
- i = 1;
- setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
-
- if (ip_version == 6) {
- b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
- }
- else {
- b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
- }
-
- if (b < 0) {
- syslog(LOG_ALERT, "tcpserver: bind: %m");
- return (-1);
- }
-
- fcntl(s, F_SETFL, O_NONBLOCK);
-
- if (listen(s, ((queue_len >= 5) ? queue_len : 5) ) < 0) {
- syslog(LOG_ALERT, "tcpserver: listen: %m");
- return (-1);
- }
- return (s);
-}
-
-
-// Create a Unix domain socket and listen on it
-int ctdl_uds_server(char *sockpath, int queue_len) {
- struct sockaddr_un addr;
- int s;
- int i;
- int actual_queue_len;
-#ifdef HAVE_STRUCT_UCRED
- int passcred = 1;
-#endif
-
- actual_queue_len = queue_len;
- if (actual_queue_len < 5) actual_queue_len = 5;
-
- i = unlink(sockpath);
- if ((i != 0) && (errno != ENOENT)) {
- syslog(LOG_ERR, "udsserver: %m");
- return(-1);
- }
-
- memset(&addr, 0, sizeof(addr));
- addr.sun_family = AF_UNIX;
- safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
-
- s = socket(AF_UNIX, SOCK_STREAM, 0);
- if (s < 0) {
- syslog(LOG_ERR, "udsserver: socket: %m");
- return(-1);
- }
-
- if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
- syslog(LOG_ERR, "udsserver: bind: %m");
- return(-1);
- }
-
- // set to nonblock - we need this for some obscure situations
- if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
- syslog(LOG_ERR, "udsserver: fcntl: %m");
- close(s);
- return(-1);
- }
-
- if (listen(s, actual_queue_len) < 0) {
- syslog(LOG_ERR, "udsserver: listen: %m");
- return(-1);
- }
-
-#ifdef HAVE_STRUCT_UCRED
- setsockopt(s, SOL_SOCKET, SO_PASSCRED, &passcred, sizeof(passcred));
-#endif
-
- chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
- return(s);
-}
-
-
-// The following functions implement output buffering on operating systems which
-// support it (such as Linux and various BSD flavors).
-#ifndef HAVE_DARWIN
-#ifdef TCP_CORK
-# define HAVE_TCP_BUFFERING
-#else
-# ifdef TCP_NOPUSH
-# define HAVE_TCP_BUFFERING
-# define TCP_CORK TCP_NOPUSH
-# endif
-#endif // TCP_CORK
-#endif // HAVE_DARWIN
-
-static unsigned on = 1, off = 0;
-
-void buffer_output(void) {
-#ifdef HAVE_TCP_BUFFERING
-#ifdef HAVE_OPENSSL
- if (!CC->redirect_ssl)
-#endif
- setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
-#endif
-}
-
-void unbuffer_output(void) {
-#ifdef HAVE_TCP_BUFFERING
-#ifdef HAVE_OPENSSL
- if (!CC->redirect_ssl)
-#endif
- setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
-#endif
-}
-
-void flush_output(void) {
-#ifdef HAVE_TCP_BUFFERING
- struct CitContext *CCC = CC;
- setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
- setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
-#endif
-}
-
-
-// close the client socket
-void client_close(void) {
- CitContext *CCC = CC;
-
- if (!CCC) return;
- if (CCC->client_socket <= 0) return;
- syslog(LOG_DEBUG, "sysdep: closing socket %d", CCC->client_socket);
- close(CCC->client_socket);
- CCC->client_socket = -1 ;
-}
-
-
-// Send binary data to the client.
-int client_write(const char *buf, int nbytes)
-{
- int bytes_written = 0;
- int retval;
-#ifndef HAVE_TCP_BUFFERING
- int old_buffer_len = 0;
-#endif
- fd_set wset;
- CitContext *Ctx;
- int fdflags;
-
- if (nbytes < 1) return(0);
-
- Ctx = CC;
-
- if (Ctx->redirect_buffer != NULL) {
- StrBufAppendBufPlain(Ctx->redirect_buffer,
- buf, nbytes, 0);
- return 0;
- }
-
-#ifdef HAVE_OPENSSL
- if (Ctx->redirect_ssl) {
- client_write_ssl(buf, nbytes);
- return 0;
- }
-#endif
- if (Ctx->client_socket == -1) return -1;
-
- fdflags = fcntl(Ctx->client_socket, F_GETFL);
-
- while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
- if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
- FD_ZERO(&wset);
- FD_SET(Ctx->client_socket, &wset);
- if (select(1, NULL, &wset, NULL, NULL) == -1) {
- if (errno == EINTR)
- {
- syslog(LOG_DEBUG, "sysdep: client_write(%d bytes) select() interrupted.", nbytes-bytes_written);
- if (server_shutting_down) {
- CC->kill_me = KILLME_SELECT_INTERRUPTED;
- return (-1);
- } else {
- // can't trust fd's and stuff so we need to re-create them
- continue;
- }
- } else {
- syslog(LOG_ERR, "sysdep: client_write(%d bytes) select failed: %m", nbytes - bytes_written);
- client_close();
- Ctx->kill_me = KILLME_SELECT_FAILED;
- return -1;
- }
- }
- }
-
- retval = write(Ctx->client_socket, &buf[bytes_written], nbytes - bytes_written);
- if (retval < 1) {
- syslog(LOG_ERR, "sysdep: client_write(%d bytes) failed: %m", nbytes - bytes_written);
- client_close();
- Ctx->kill_me = KILLME_WRITE_FAILED;
- return -1;
- }
- bytes_written = bytes_written + retval;
- }
- return 0;
-}
-
-void cputbuf(const StrBuf *Buf) {
- client_write(ChrPtr(Buf), StrLength(Buf));
-}
-
-
-// Send formatted printable data to the client.
-// Implemented in terms of client_write() so it's technically not sysdep...
-void cprintf(const char *format, ...) {
- va_list arg_ptr;
- char buf[1024];
-
- va_start(arg_ptr, format);
- if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
- buf[sizeof buf - 2] = '\n';
- client_write(buf, strlen(buf));
- va_end(arg_ptr);
-}
-
-
-// Read data from the client socket.
-//
-// sock socket fd to read from
-// buf buffer to read into
-// bytes number of bytes to read
-// timeout Number of seconds to wait before timing out
-//
-// Possible return values:
-// 1 Requested number of bytes has been read.
-// 0 Request timed out.
-// -1 Connection is broken, or other error.
-int client_read_blob(StrBuf *Target, int bytes, int timeout) {
- CitContext *CCC=CC;
- const char *Error;
- int retval = 0;
-
-#ifdef HAVE_OPENSSL
- if (CCC->redirect_ssl) {
- retval = client_read_sslblob(Target, bytes, timeout);
- if (retval < 0) {
- syslog(LOG_ERR, "sysdep: client_read_blob() failed");
- }
- }
- else
-#endif
- {
- retval = StrBufReadBLOBBuffered(Target,
- CCC->RecvBuf.Buf,
- &CCC->RecvBuf.ReadWritePointer,
- &CCC->client_socket,
- 1,
- bytes,
- O_TERM,
- &Error
- );
- if (retval < 0) {
- syslog(LOG_ERR, "sysdep: client_read_blob() failed: %s", Error);
- client_close();
- return retval;
- }
- }
- return retval;
-}
-
-
-// to make client_read_random_blob() more efficient, increase buffer size.
-// just use in greeting function, else your buffer may be flushed
-void client_set_inbound_buf(long N)
-{
- CitContext *CCC=CC;
- FlushStrBuf(CCC->RecvBuf.Buf);
- ReAdjustEmptyBuf(CCC->RecvBuf.Buf, N * SIZ, N * SIZ);
-}
-
-int client_read_random_blob(StrBuf *Target, int timeout)
-{
- CitContext *CCC=CC;
- int rc;
-
- rc = client_read_blob(Target, 1, timeout);
- if (rc > 0)
- {
- long len;
- const char *pch;
-
- len = StrLength(CCC->RecvBuf.Buf);
- pch = ChrPtr(CCC->RecvBuf.Buf);
-
- if (len > 0)
- {
- if (CCC->RecvBuf.ReadWritePointer != NULL) {
- len -= CCC->RecvBuf.ReadWritePointer - pch;
- pch = CCC->RecvBuf.ReadWritePointer;
- }
- StrBufAppendBufPlain(Target, pch, len, 0);
- FlushStrBuf(CCC->RecvBuf.Buf);
- CCC->RecvBuf.ReadWritePointer = NULL;
- return StrLength(Target);
- }
- return rc;
- }
- else
- return rc;
-}
-
-int client_read_to(char *buf, int bytes, int timeout)
-{
- CitContext *CCC=CC;
- int rc;
-
- rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
- if (rc < 0)
- {
- *buf = '\0';
- return rc;
- }
- else
- {
- memcpy(buf,
- ChrPtr(CCC->MigrateBuf),
- StrLength(CCC->MigrateBuf) + 1);
- FlushStrBuf(CCC->MigrateBuf);
- return rc;
- }
-}
-
-
-int HaveMoreLinesWaiting(CitContext *CCC) {
- if ((CCC->kill_me != 0) ||
- ( (CCC->RecvBuf.ReadWritePointer == NULL) &&
- (StrLength(CCC->RecvBuf.Buf) == 0) &&
- (CCC->client_socket != -1)) )
- return 0;
- else
- return 1;
-}
-
-
-// Read data from the client socket with default timeout.
-// (This is implemented in terms of client_read_to() and could be
-// justifiably moved out of sysdep.c)
-INLINE int client_read(char *buf, int bytes) {
- return(client_read_to(buf, bytes, CtdlGetConfigInt("c_sleeping")));
-}
-
-int CtdlClientGetLine(StrBuf *Target) {
- CitContext *CCC=CC;
- const char *Error;
- int rc;
-
- FlushStrBuf(Target);
-#ifdef HAVE_OPENSSL
- if (CCC->redirect_ssl) {
- rc = client_readline_sslbuffer(Target, CCC->RecvBuf.Buf, &CCC->RecvBuf.ReadWritePointer, 1);
- return rc;
- }
- else
-#endif
- {
- rc = StrBufTCP_read_buffered_line_fast(Target,
- CCC->RecvBuf.Buf,
- &CCC->RecvBuf.ReadWritePointer,
- &CCC->client_socket,
- 5,
- 1,
- &Error
- );
- return rc;
- }
-}
-
-
-// Get a LF-terminated line of text from the client.
-// (This is implemented in terms of client_read() and could be
-// justifiably moved out of sysdep.c)
-int client_getln(char *buf, int bufsize) {
- int i, retval;
- CitContext *CCC=CC;
- const char *pCh;
-
- retval = CtdlClientGetLine(CCC->MigrateBuf);
- if (retval < 0)
- return(retval >= 0);
-
-
- i = StrLength(CCC->MigrateBuf);
- pCh = ChrPtr(CCC->MigrateBuf);
- // Strip the trailing LF, and the trailing CR if present.
- if (bufsize <= i)
- i = bufsize - 1;
- while ( (i > 0)
- && ( (pCh[i - 1]==13)
- || ( pCh[i - 1]==10)) ) {
- i--;
- }
- memcpy(buf, pCh, i);
- buf[i] = 0;
-
- FlushStrBuf(CCC->MigrateBuf);
- if (retval < 0) {
- safestrncpy(&buf[i], "000", bufsize - i);
- }
- return(retval >= 0);
-}
-
-
-// Cleanup any contexts that are left lying around
-void close_masters(void) {
- struct ServiceFunctionHook *serviceptr;
- const char *Text;
-
- // close all protocol master sockets
- for (serviceptr = ServiceHookTable; serviceptr != NULL;
- serviceptr = serviceptr->next ) {
-
- if (serviceptr->tcp_port > 0) {
- if (serviceptr->msock == -1) {
- Text = "not closing again";
- }
- else {
- Text = "Closing";
- }
- syslog(LOG_INFO, "sysdep: %s %d listener on port %d",
- Text,
- serviceptr->msock,
- serviceptr->tcp_port
- );
- serviceptr->tcp_port = 0;
- }
-
- if (serviceptr->sockpath != NULL) {
- if (serviceptr->msock == -1) {
- Text = "not closing again";
- }
- else {
- Text = "Closing";
- }
- syslog(LOG_INFO, "sysdep: %s %d listener on '%s'",
- Text,
- serviceptr->msock,
- serviceptr->sockpath
- );
- }
-
- if (serviceptr->msock != -1) {
- close(serviceptr->msock);
- serviceptr->msock = -1;
- }
-
- // If it's a Unix domain socket, remove the file.
- if (serviceptr->sockpath != NULL) {
- unlink(serviceptr->sockpath);
- serviceptr->sockpath = NULL;
- }
- }
-}
-
-
-// The system-dependent part of master_cleanup() - close the master socket.
-void sysdep_master_cleanup(void) {
- close_masters();
- context_cleanup();
-}
-
-
-
-pid_t current_child;
-void graceful_shutdown(int signum) {
- kill(current_child, signum);
- unlink(file_pid_file);
- exit(0);
-}
-
-int nFireUps = 0;
-int nFireUpsNonRestart = 0;
-pid_t ForkedPid = 1;
-
-// Start running as a daemon.
-void start_daemon(int unused) {
- 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.
- child = fork();
- if (child != 0) {
- exit(0);
- }
-
- signal(SIGHUP, SIG_IGN);
- signal(SIGINT, SIG_IGN);
- signal(SIGQUIT, SIG_IGN);
-
- setsid();
- umask(0);
- if ( (freopen("/dev/null", "r", stdin) != stdin) ||
- (freopen("/dev/null", "w", stdout) != stdout) ||
- (freopen("/dev/null", "w", stderr) != stderr)
- ) {
- syslog(LOG_ERR, "sysdep: unable to reopen stdio: %m");
- }
-
- do {
- current_child = fork();
- signal(SIGTERM, graceful_shutdown);
- if (current_child < 0) {
- perror("fork");
- exit(errno);
- }
- else if (current_child == 0) {
- return; // continue starting citadel.
- }
- else {
- fp = fopen(file_pid_file, "w");
- if (fp != NULL) {
- fprintf(fp, ""F_PID_T"\n", getpid());
- fclose(fp);
- }
- waitpid(current_child, &status, 0);
- }
- nFireUpsNonRestart = nFireUps;
-
- // Exit code 0 means the watcher should exit
- if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
- do_restart = 0;
- }
-
- // Exit code 101-109 means the watcher should exit
- else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
- do_restart = 0;
- }
-
- // Any other exit code, or no exit code, means we should restart.
- else {
- do_restart = 1;
- nFireUps++;
- ForkedPid = current_child;
- }
-
- } while (do_restart);
-
- unlink(file_pid_file);
- exit(WEXITSTATUS(status));
-}
-
-
-void checkcrash(void) {
- if (nFireUpsNonRestart != nFireUps) {
- StrBuf *CrashMail;
- CrashMail = NewStrBuf();
- syslog(LOG_ALERT, "sysdep: posting crash message");
- StrBufPrintf(CrashMail,
- " \n"
- " The Citadel server process (citserver) terminated unexpectedly."
- "\n \n"
- " This could be the result of a bug in the server program, or some external "
- "factor.\n \n"
- " You can obtain more information about this by enabling core dumps.\n \n"
- " For more information, please see:\n \n"
- " http://citadel.org/doku.php?id=faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
- "\n \n"
-
- " If you have already done this, the core dump is likely to be found at %score.%d\n"
- ,
- ctdl_run_dir, ForkedPid);
- CtdlAideMessage(ChrPtr(CrashMail), "Citadel server process terminated unexpectedly");
- FreeStrBuf(&CrashMail);
- }
-}
-
-
-// Generic routine to convert a login name to a full name (gecos)
-// Returns nonzero if a conversion took place
-int convert_login(char NameToConvert[]) {
- struct passwd *pw;
- unsigned int a;
-
- pw = getpwnam(NameToConvert);
- if (pw == NULL) {
- return(0);
- }
- else {
- strcpy(NameToConvert, pw->pw_gecos);
- for (a=0; a<strlen(NameToConvert); ++a) {
- if (NameToConvert[a] == ',') NameToConvert[a] = 0;
- }
- return(1);
- }
-}
-
-
-void HuntBadSession(void) {
- int highest;
- CitContext *ptr;
- fd_set readfds;
- struct timeval tv;
- struct ServiceFunctionHook *serviceptr;
-
- // Next, add all of the client sockets
- begin_critical_section(S_SESSION_TABLE);
- for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
- if ((ptr->state == CON_SYS) && (ptr->client_socket == 0))
- continue;
- // Initialize the fdset.
- FD_ZERO(&readfds);
- highest = 0;
- tv.tv_sec = 0; // wake up every second if no input
- tv.tv_usec = 0;
-
- // Don't select on dead sessions, only truly idle ones
- if ( (ptr->state == CON_IDLE)
- && (ptr->kill_me == 0)
- && (ptr->client_socket > 0)
- ) {
- FD_SET(ptr->client_socket, &readfds);
- if (ptr->client_socket > highest)
- highest = ptr->client_socket;
-
- if ((select(highest + 1, &readfds, NULL, NULL, &tv) < 0) && (errno == EBADF))
- {
- // Gotcha!
- syslog(LOG_ERR,
- "sysdep: killing session CC[%d] bad FD: [%d] User[%s] Host[%s:%s]",
- ptr->cs_pid,
- ptr->client_socket,
- ptr->curr_user,
- ptr->cs_host,
- ptr->cs_addr
- );
- ptr->kill_me = 1;
- ptr->client_socket = -1;
- break;
- }
- }
- }
- end_critical_section(S_SESSION_TABLE);
-
- // First, add the various master sockets to the fdset.
- for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next ) {
-
- // Initialize the fdset.
- highest = 0;
- tv.tv_sec = 0; // wake up every second if no input
- tv.tv_usec = 0;
-
- FD_SET(serviceptr->msock, &readfds);
- if (serviceptr->msock > highest) {
- highest = serviceptr->msock;
- }
- if ((select(highest + 1, &readfds, NULL, NULL, &tv) < 0) &&
- (errno == EBADF))
- {
- // Gotcha! server socket dead? commit suicide!
- syslog(LOG_ERR, "sysdep: found bad FD: %d and its a server socket! Shutting Down!", serviceptr->msock);
- server_shutting_down = 1;
- break;
- }
- }
-}
-
-
-// This loop just keeps going and going and going...
-void *worker_thread(void *blah) {
- int highest;
- CitContext *ptr;
- CitContext *bind_me = NULL;
- fd_set readfds;
- int retval = 0;
- struct timeval tv;
- int force_purge = 0;
- struct ServiceFunctionHook *serviceptr;
- int ssock; // Descriptor for client socket
- CitContext *con = NULL; // Temporary context pointer
- int i;
-
- pthread_mutex_lock(&ThreadCountMutex);
- ++num_workers;
- pthread_mutex_unlock(&ThreadCountMutex);
-
- while (!server_shutting_down) {
-
- // make doubly sure we're not holding any stale db handles which might cause a deadlock
- cdb_check_handles();
-do_select: force_purge = 0;
- bind_me = NULL; // Which session shall we handle?
-
- // Initialize the fdset
- FD_ZERO(&readfds);
- highest = 0;
-
- // First, add the various master sockets to the fdset.
- for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next ) {
- FD_SET(serviceptr->msock, &readfds);
- if (serviceptr->msock > highest) {
- highest = serviceptr->msock;
- }
- }
-
- // Next, add all of the client sockets.
- begin_critical_section(S_SESSION_TABLE);
- for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
- if ((ptr->state == CON_SYS) && (ptr->client_socket == 0))
- continue;
-
- // Don't select on dead sessions, only truly idle ones
- if ( (ptr->state == CON_IDLE)
- && (ptr->kill_me == 0)
- && (ptr->client_socket > 0)
- ) {
- FD_SET(ptr->client_socket, &readfds);
- if (ptr->client_socket > highest)
- highest = ptr->client_socket;
- }
- if ((bind_me == NULL) && (ptr->state == CON_READY)) {
- bind_me = ptr;
- ptr->state = CON_EXECUTING;
- break;
- }
- if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
- bind_me = ptr;
- ptr->state = CON_STARTING;
- break;
- }
- }
- end_critical_section(S_SESSION_TABLE);
-
- if (bind_me) {
- goto SKIP_SELECT;
- }
-
- // If we got this far, it means that there are no sessions
- // which a previous thread marked for attention, so we go
- // ahead and get ready to select().
-
- if (!server_shutting_down) {
- tv.tv_sec = 1; // wake up every second if no input
- tv.tv_usec = 0;
- retval = select(highest + 1, &readfds, NULL, NULL, &tv);
- }
- else {
- --num_workers;
- return NULL;
- }
-
- // Now figure out who made this select() unblock.
- // First, check for an error or exit condition.
- if (retval < 0) {
- if (errno == EBADF) {
- syslog(LOG_ERR, "sysdep: select() failed: %m");
- HuntBadSession();
- goto do_select;
- }
- if (errno != EINTR) {
- syslog(LOG_ERR, "sysdep: exiting: %m");
- server_shutting_down = 1;
- continue;
- } else {
- if (server_shutting_down) {
- --num_workers;
- return(NULL);
- }
- goto do_select;
- }
- }
- else if (retval == 0) {
- if (server_shutting_down) {
- --num_workers;
- return(NULL);
- }
- }
-
- // Next, check to see if it's a new client connecting on a master socket.
-
- else if ((retval > 0) && (!server_shutting_down)) for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next) {
-
- if (FD_ISSET(serviceptr->msock, &readfds)) {
- ssock = accept(serviceptr->msock, NULL, 0);
- if (ssock >= 0) {
- syslog(LOG_DEBUG, "sysdep: new client socket %d", ssock);
-
- // The master socket is non-blocking but the client
- // sockets need to be blocking, otherwise certain
- // operations barf on FreeBSD. Not a fatal error.
- if (fcntl(ssock, F_SETFL, 0) < 0) {
- syslog(LOG_ERR, "sysdep: Can't set socket to blocking: %m");
- }
-
- // New context will be created already
- // set up in the CON_EXECUTING state.
- con = CreateNewContext();
-
- // Assign our new socket number to it.
- con->tcp_port = serviceptr->tcp_port;
- con->client_socket = ssock;
- con->h_command_function = serviceptr->h_command_function;
- con->h_async_function = serviceptr->h_async_function;
- con->h_greeting_function = serviceptr->h_greeting_function;
- con->ServiceName = serviceptr->ServiceName;
-
- // Connections on a local client are always from the same host
- if (serviceptr->sockpath != NULL) {
- con->is_local_client = 1;
- }
-
- // Set the SO_REUSEADDR socket option
- i = 1;
- setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
- con->state = CON_GREETING;
- retval--;
- if (retval == 0)
- break;
- }
- }
- }
-
- // It must be a client socket. Find a context that has data
- // waiting on its socket *and* is in the CON_IDLE state. Any
- // active sockets other than our chosen one are marked as
- // CON_READY so the next thread that comes around can just bind
- // to one without having to select() again.
- begin_critical_section(S_SESSION_TABLE);
- for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
- int checkfd = ptr->client_socket;
- if ((checkfd != -1) && (ptr->state == CON_IDLE) ){
- if (FD_ISSET(checkfd, &readfds)) {
- ptr->input_waiting = 1;
- if (!bind_me) {
- bind_me = ptr; // I choose you!
- bind_me->state = CON_EXECUTING;
- }
- else {
- ptr->state = CON_READY;
- }
- } else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
- if (!bind_me) {
- bind_me = ptr; // I choose you!
- bind_me->state = CON_EXECUTING;
- }
- else {
- ptr->state = CON_READY;
- }
- }
- }
- }
- end_critical_section(S_SESSION_TABLE);
-
-SKIP_SELECT:
- // We're bound to a session
- pthread_mutex_lock(&ThreadCountMutex);
- ++active_workers;
- pthread_mutex_unlock(&ThreadCountMutex);
-
- if (bind_me != NULL) {
- become_session(bind_me);
-
- if (bind_me->state == CON_STARTING) {
- bind_me->state = CON_EXECUTING;
- begin_session(bind_me);
- bind_me->h_greeting_function();
- }
- // If the client has sent a command, execute it.
- if (CC->input_waiting) {
- CC->h_command_function();
-
- while (HaveMoreLinesWaiting(CC))
- CC->h_command_function();
-
- CC->input_waiting = 0;
- }
-
- // If there are asynchronous messages waiting and the client supports it, do those now
- if ((CC->is_async) && (CC->async_waiting) && (CC->h_async_function != NULL)) {
- CC->h_async_function();
- CC->async_waiting = 0;
- }
-
- force_purge = CC->kill_me;
- become_session(NULL);
- bind_me->state = CON_IDLE;
- }
-
- dead_session_purge(force_purge);
- do_housekeeping();
-
- pthread_mutex_lock(&ThreadCountMutex);
- --active_workers;
- if ((active_workers + CtdlGetConfigInt("c_min_workers") < num_workers) &&
- (num_workers > CtdlGetConfigInt("c_min_workers")))
- {
- num_workers--;
- pthread_mutex_unlock(&ThreadCountMutex);
- return (NULL);
- }
- pthread_mutex_unlock(&ThreadCountMutex);
- }
-
- // If control reaches this point, the server is shutting down
- pthread_mutex_lock(&ThreadCountMutex);
- --num_workers;
- pthread_mutex_unlock(&ThreadCountMutex);
- return(NULL);
-}
-
-
-// SyslogFacility()
-// Translate text facility name to syslog.h defined value.
-int SyslogFacility(char *name)
-{
- int i;
- struct
- {
- int facility;
- char *name;
- } facTbl[] =
- {
- { LOG_KERN, "kern" },
- { LOG_USER, "user" },
- { LOG_MAIL, "mail" },
- { LOG_DAEMON, "daemon" },
- { LOG_AUTH, "auth" },
- { LOG_SYSLOG, "syslog" },
- { LOG_LPR, "lpr" },
- { LOG_NEWS, "news" },
- { LOG_UUCP, "uucp" },
- { LOG_LOCAL0, "local0" },
- { LOG_LOCAL1, "local1" },
- { LOG_LOCAL2, "local2" },
- { LOG_LOCAL3, "local3" },
- { LOG_LOCAL4, "local4" },
- { LOG_LOCAL5, "local5" },
- { LOG_LOCAL6, "local6" },
- { LOG_LOCAL7, "local7" },
- { 0, NULL }
- };
- for(i = 0; facTbl[i].name != NULL; i++) {
- if(!strcasecmp(name, facTbl[i].name))
- return facTbl[i].facility;
- }
- return LOG_DAEMON;
-}
projects / citadel.git / blobdiff