#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>
/*
* lprintf() ... Write logging information
- *
- * Note: the variable "buf" below needs to be large enough to handle any
- * log data sent through this function. BE CAREFUL!
*/
+extern int running_as_daemon;
+static int enable_syslog = 1;
void lprintf(enum LogLevel loglevel, const char *format, ...) {
va_list arg_ptr;
- char buf[SIZ];
- va_start(arg_ptr, format);
- vsnprintf(buf, sizeof(buf), format, arg_ptr);
- va_end(arg_ptr);
-
- if (syslog_facility >= 0) {
- if (loglevel <= verbosity) {
- /* Hackery -IO */
- if (CC->cs_pid != 0) {
- memmove(&buf[6], buf, sizeof(buf) - 6);
- snprintf(buf, 6, "[%3d]", CC->cs_pid);
- buf[5] = ' ';
- }
- syslog(loglevel, "%s", buf);
- }
+ if (enable_syslog) {
+ va_start(arg_ptr, format);
+ vsyslog(loglevel, format, arg_ptr);
+ va_end(arg_ptr);
}
- else if (loglevel <= verbosity) {
+
+ /* stderr output code */
+ if (enable_syslog || running_as_daemon) return;
+
+ /* if we run in forground and syslog is disabled, log to terminal */
+ if (loglevel <= verbosity) {
struct timeval tv;
struct tm tim;
time_t unixtime;
localtime_r(&unixtime, &tim);
if (CC->cs_pid != 0) {
fprintf(stderr,
- "%04d/%02d/%02d %2d:%02d:%02d.%06ld [%3d] %s",
+ "%04d/%02d/%02d %2d:%02d:%02d.%06ld [%3d] ",
tim.tm_year + 1900, tim.tm_mon + 1,
tim.tm_mday, tim.tm_hour, tim.tm_min,
tim.tm_sec, (long)tv.tv_usec,
- CC->cs_pid, buf);
+ CC->cs_pid);
} else {
fprintf(stderr,
- "%04d/%02d/%02d %2d:%02d:%02d.%06ld %s",
+ "%04d/%02d/%02d %2d:%02d:%02d.%06ld ",
tim.tm_year + 1900, tim.tm_mon + 1,
tim.tm_mday, tim.tm_hour, tim.tm_min,
- tim.tm_sec, (long)tv.tv_usec, buf);
+ tim.tm_sec, (long)tv.tv_usec);
}
+ va_start(arg_ptr, format);
+ vfprintf(stderr, format, arg_ptr);
+ va_end(arg_ptr);
fflush(stderr);
}
-
- PerformLogHooks(loglevel, buf);
}
/*
- * We used to use master_cleanup() as a signal handler to shut down the server.
- * however, master_cleanup() and the functions it calls do some things that
- * aren't such a good idea to do from a signal handler: acquiring mutexes,
- * playing with signal masks on BSDI systems, etc. so instead we install the
- * following signal handler to set a global variable to inform the main loop
- * that it's time to call master_cleanup() and exit.
+ * Signal handler to shut down the server.
*/
volatile int time_to_die = 0;
static RETSIGTYPE signal_cleanup(int signum) {
+ lprintf(CTDL_DEBUG, "Caught signal %d; shutting down.\n", signum);
time_to_die = 1;
+ master_cleanup(signum);
}
*/
void init_sysdep(void) {
int i;
+ sigset_t set;
/* Avoid vulnerabilities related to FD_SETSIZE if we can. */
#ifdef FD_SETSIZE
* The action for unexpected signals and exceptions should be to
* call signal_cleanup() to gracefully shut down the server.
*/
+ sigemptyset(&set);
+ sigaddset(&set, SIGINT);
+ sigaddset(&set, SIGQUIT);
+ sigaddset(&set, SIGHUP);
+ sigaddset(&set, SIGTERM);
+ // sigaddset(&set, SIGSEGV); commented out because
+ // sigaddset(&set, SIGILL); we want core dumps
+ // sigaddset(&set, SIGBUS);
+ sigprocmask(SIG_UNBLOCK, &set, NULL);
+
signal(SIGINT, signal_cleanup);
signal(SIGQUIT, signal_cleanup);
signal(SIGHUP, signal_cleanup);
signal(SIGTERM, signal_cleanup);
+ // signal(SIGSEGV, signal_cleanup); commented out because
+ // signal(SIGILL, signal_cleanup); we want core dumps
+ // signal(SIGBUS, signal_cleanup);
/*
* Do not shut down the server on broken pipe signals, otherwise the
return(-1);
}
+ /* set to nonblock - we need this for some obscure situations */
+ if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
+ lprintf(CTDL_EMERG, "citserver: Can't set socket to non-blocking: %s\n",
+ strerror(errno));
+ close(s);
+ return(-1);
+ }
+
if (listen(s, actual_queue_len) < 0) {
lprintf(CTDL_EMERG, "citserver: Can't listen: %s\n", strerror(errno));
close(s);
return(-1);
}
+ /* set to nonblock - we need this for some obscure situations */
+ if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
+ lprintf(CTDL_EMERG, "citserver: Can't set socket to non-blocking: %s\n",
+ strerror(errno));
+ close(s);
+ return(-1);
+ }
+
if (listen(s, actual_queue_len) < 0) {
lprintf(CTDL_EMERG, "citserver: Can't listen: %s\n", strerror(errno));
return(-1);
* sessions terminate.
*/
struct CitContext *CreateNewContext(void) {
- struct CitContext *me, *ptr;
+ struct CitContext *me;
+ static int next_pid = 0;
me = (struct CitContext *) malloc(sizeof(struct CitContext));
if (me == NULL) {
* the list.
*/
begin_critical_section(S_SESSION_TABLE);
-
- if (ContextList == NULL) {
- ContextList = me;
- me->cs_pid = 1;
- me->next = NULL;
- }
-
- else if (ContextList->cs_pid > 1) {
- me->next = ContextList;
- ContextList = me;
- me->cs_pid = 1;
- }
-
- else {
- for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
- if (ptr->next == NULL) {
- ptr->next = me;
- me->cs_pid = ptr->cs_pid + 1;
- me->next = NULL;
- goto DONE;
- }
- else if (ptr->next->cs_pid > (ptr->cs_pid+1)) {
- me->next = ptr->next;
- ptr->next = me;
- me->cs_pid = ptr->cs_pid + 1;
- goto DONE;
- }
- }
+ me->cs_pid = ++next_pid;
+ me->prev = NULL;
+ me->next = ContextList;
+ ContextList = me;
+ if (me->next != NULL) {
+ me->next->prev = me;
}
-
-DONE: ++num_sessions;
+ ++num_sessions;
end_critical_section(S_SESSION_TABLE);
return(me);
}
/*
- * buffer_output() ... tell client_write to buffer all output until
- * instructed to dump it all out later
+ * The following functions implement output buffering. If the kernel supplies
+ * native TCP buffering (Linux & *BSD), use that; otherwise, emulate it with
+ * user-space buffering.
*/
+#ifdef TCP_CORK
+# define HAVE_TCP_BUFFERING
+#else
+# ifdef TCP_NOPUSH
+# define HAVE_TCP_BUFFERING
+# define TCP_CORK TCP_NOPUSH
+# endif
+#endif
+
+
+#ifdef HAVE_TCP_BUFFERING
+static unsigned on = 1, off = 0;
+void buffer_output(void) {
+ struct CitContext *ctx = MyContext();
+ setsockopt(ctx->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
+ ctx->buffering = 1;
+}
+
+void unbuffer_output(void) {
+ struct CitContext *ctx = MyContext();
+ setsockopt(ctx->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
+ ctx->buffering = 0;
+}
+
+void flush_output(void) {
+ struct CitContext *ctx = MyContext();
+ setsockopt(ctx->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
+ setsockopt(ctx->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
+}
+#else
void buffer_output(void) {
if (CC->buffering == 0) {
CC->buffering = 1;
}
}
-/*
- * flush_output() ... dump out all that output we've been buffering.
- */
void flush_output(void) {
if (CC->buffering == 1) {
client_write(CC->output_buffer, CC->buffer_len);
}
}
-/*
- * unbuffer_output() ... stop buffering output.
- */
void unbuffer_output(void) {
if (CC->buffering == 1) {
CC->buffering = 0;
CC->output_buffer = NULL;
}
}
+#endif
{
int bytes_written = 0;
int retval;
- int sock;
+#ifndef HAVE_TCP_BUFFERING
int old_buffer_len = 0;
+#endif
- if (CC->redirect_fp != NULL) {
- fwrite(buf, (size_t)nbytes, (size_t)1, CC->redirect_fp);
+ if (CC->redirect_buffer != NULL) {
+ if ((CC->redirect_len + nbytes + 2) >= CC->redirect_alloc) {
+ CC->redirect_alloc = (CC->redirect_alloc * 2) + nbytes;
+ CC->redirect_buffer = realloc(CC->redirect_buffer,
+ CC->redirect_alloc);
+ }
+ memcpy(&CC->redirect_buffer[CC->redirect_len], buf, nbytes);
+ CC->redirect_len += nbytes;
+ CC->redirect_buffer[CC->redirect_len] = 0;
return;
}
- if (CC->redirect_sock > 0) {
- sock = CC->redirect_sock; /* and continue below... */
- }
- else {
- sock = CC->client_socket;
+ if (CC->redirect_fp != NULL) {
+ fwrite(buf, (size_t)nbytes, (size_t)1, CC->redirect_fp);
+ return;
}
+#ifndef HAVE_TCP_BUFFERING
/* If we're buffering for later, do that now. */
if (CC->buffering) {
old_buffer_len = CC->buffer_len;
memcpy(&CC->output_buffer[old_buffer_len], buf, nbytes);
return;
}
+#endif
/* Ok, at this point we're not buffering. Go ahead and write. */
#endif
while (bytes_written < nbytes) {
- retval = write(sock, &buf[bytes_written],
+ retval = write(CC->client_socket, &buf[bytes_written],
nbytes - bytes_written);
if (retval < 1) {
lprintf(CTDL_ERR, "client_write() failed: %s\n",
strerror(errno));
- if (sock == CC->client_socket) CC->kill_me = 1;
+ CC->kill_me = 1;
return;
}
bytes_written = bytes_written + retval;
/*
- * Start running as a daemon. Only close stdio if do_close_stdio is set.
+ * Start running as a daemon.
*/
-void start_daemon(int do_close_stdio) {
- if (do_close_stdio) {
- /* close(0); */
- close(1);
- close(2);
- }
+void start_daemon(int unused) {
+ close(0); close(1); close(2);
+ if (fork()) exit(0);
+ setsid();
signal(SIGHUP,SIG_IGN);
signal(SIGINT,SIG_IGN);
signal(SIGQUIT,SIG_IGN);
- if (fork()!=0) exit(0);
}
/*
- * Redirect a session's output to a file or socket.
- * This function may be called with a file handle *or* a socket (but not
- * both). Call with neither to return output to its normal client socket.
+ * Redirect a session's output to a file.
+ * This function may be called with a file handle.
+ * Call with NULL to return output to its normal client socket.
*/
-void CtdlRedirectOutput(FILE *fp, int sock) {
-
+void CtdlRedirectOutput(FILE *fp)
+{
if (fp != NULL) CC->redirect_fp = fp;
else CC->redirect_fp = NULL;
-
- if (sock > 0) CC->redirect_sock = sock;
- else CC->redirect_sock = (-1);
-
}
}
end_critical_section(S_SESSION_TABLE);
- if (bind_me) goto SKIP_SELECT;
+ 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
if (FD_ISSET(serviceptr->msock, &readfds)) {
ssock = accept(serviceptr->msock, NULL, 0);
- if (ssock < 0) {
- lprintf(CTDL_CRIT,
- "citserver: accept(): %s\n",
- strerror(errno));
- }
- else {
+ if (ssock >= 0) {
lprintf(CTDL_DEBUG,
"New client socket %d\n",
ssock);
if(!strcasecmp(name, facTbl[i].name))
return facTbl[i].facility;
}
- return -1;
+ enable_syslog = 0;
+ return LOG_DAEMON;
}
projects / citadel.git / blobdiff