/*
* Citadel "system dependent" stuff.
*
* Here's where we (hopefully) have most parts of the Citadel server that
* would need to be altered to run the server in a non-POSIX environment.
*
* If we ever port to a different platform and either have multiple
* variants of this file or simply load it up with #ifdefs.
*
* Copyright (c) 1987-2011 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>
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#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>
#define SHOW_ME_VAPPEND_PRINTF
#include <libcitadel.h>
#include "citadel.h"
#include "server.h"
#include "sysdep_decls.h"
#include "citserver.h"
#include "support.h"
#include "config.h"
#include "database.h"
#include "housekeeping.h"
#include "modules/crypto/serv_crypto.h" /* Needed for init_ssl, client_write_ssl, client_read_ssl, destruct_ssl */
#include "ecrash.h"
#include "context.h"
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#ifndef HAVE_SNPRINTF
#include "snprintf.h"
#endif
#include "ctdl_module.h"
#include "threads.h"
#include "user_ops.h"
#include "control.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, "Caught signal %d; shutting down.", signum);
exit_signal = signum;
server_shutting_down = 1;
}
static RETSIGTYPE signal_exit(int signum) {
exit(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
/*
* Set up a place to put thread-specific data.
* We only need a single pointer per thread - it points to the
* CitContext structure (in the ContextList linked list) of the
* session to which the calling thread is currently bound.
*/
if (pthread_key_create(&MyConKey, NULL) != 0) {
syslog(LOG_CRIT, "Can't create TSD key: %s", strerror(errno));
}
/*
* Interript, hangup, and terminate signals should cause the server
* to gracefully clean up and 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);
signal(SIGUSR2, signal_exit);
/*
* 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, char *errormessage)
{
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) {
snprintf(errormessage, SIZ,
"Error binding to [%s] : %s", ip_addr, strerror(errno)
);
syslog(LOG_ALERT, "%s", errormessage);
return (-1);
}
}
else /* specific IPv6 */
{
ip_version = 6;
if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
snprintf(errormessage, SIZ,
"Error binding to [%s] : %s", ip_addr, strerror(errno)
);
syslog(LOG_ALERT, "%s", errormessage);
return (-1);
}
}
if (port_number == 0) {
snprintf(errormessage, SIZ, "Can't start: no port number specified.");
syslog(LOG_ALERT, "%s", errormessage);
return (-1);
}
sin6.sin6_port = htons((u_short) port_number);
sin4.sin_port = htons((u_short) port_number);
p = getprotobyname("tcp");
s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
if (s < 0) {
snprintf(errormessage, SIZ,
"Can't create a listening socket: %s", strerror(errno)
);
syslog(LOG_ALERT, "%s", errormessage);
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) {
snprintf(errormessage, SIZ,
"Can't bind: %s", strerror(errno)
);
syslog(LOG_ALERT, "%s", errormessage);
return (-1);
}
fcntl(s, F_SETFL, O_NONBLOCK);
if (listen(s, ((queue_len >= 5) ? queue_len : 5) ) < 0) {
snprintf(errormessage, SIZ,
"Can't listen: %s", strerror(errno)
);
syslog(LOG_ALERT, "%s", errormessage);
return (-1);
}
return (s);
}
/*
* Create a Unix domain socket and listen on it
*/
int ctdl_uds_server(char *sockpath, int queue_len, char *errormessage)
{
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)) {
snprintf(errormessage, SIZ, "citserver: can't unlink %s: %s",
sockpath, strerror(errno)
);
syslog(LOG_EMERG, "%s", errormessage);
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) {
snprintf(errormessage, SIZ,
"citserver: Can't create a socket: %s",
strerror(errno));
syslog(LOG_EMERG, "%s", errormessage);
return(-1);
}
if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
snprintf(errormessage, SIZ,
"citserver: Can't bind: %s",
strerror(errno));
syslog(LOG_EMERG, "%s", errormessage);
return(-1);
}
/* set to nonblock - we need this for some obscure situations */
if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
snprintf(errormessage, SIZ,
"citserver: Can't set socket to non-blocking: %s",
strerror(errno));
syslog(LOG_EMERG, "%s", errormessage);
close(s);
return(-1);
}
if (listen(s, actual_queue_len) < 0) {
snprintf(errormessage, SIZ,
"citserver: Can't listen: %s",
strerror(errno));
syslog(LOG_EMERG, "%s", errormessage);
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
}
/*
static void flush_client_inbuf(void)
{
CitContext *CCC=CC;
FlushStrBuf(CCC->ReadBuf);
CCC->RecvBuf->ReadWritePointer = NULL;
}
*/
/*
* client_close() ... close the client socket
*/
void client_close(void) {
CitContext *CCC = CC;
if (!CCC) return;
if (CCC->client_socket <= 0) return;
syslog(LOG_DEBUG, "Closing socket %d", CCC->client_socket);
close(CCC->client_socket);
CCC->client_socket = -1 ;
}
/*
* client_write() ... 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;
#ifdef BIGBAD_IODBG
{
int rv = 0;
char fn [SIZ];
FILE *fd;
snprintf(fn, SIZ, "/tmp/foolog_%s.%d", Ctx->ServiceName, Ctx->cs_pid);
fd = fopen(fn, "a+");
if (fd)
{
fprintf(fd, "Sending: BufSize: %d BufContent: [",
nbytes);
rv = fwrite(buf, nbytes, 1, fd);
fprintf(fd, "]\n");
fclose(fd);
}
}
#endif
// flush_client_inbuf();
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, "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,
"client_write(%d bytes) select failed: %s (%d)",
nbytes - bytes_written,
strerror(errno), errno
);
cit_backtrace();
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,
"client_write(%d bytes) failed: %s (%d)",
nbytes - bytes_written,
strerror(errno), errno
);
cit_backtrace();
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));
}
/*
* cprintf() 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) {
#ifdef BIGBAD_IODBG
int rv = 0;
char fn [SIZ];
FILE *fd;
snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
fd = fopen(fn, "a+");
fprintf(fd, "Reading BLOB: BufSize: %d ",
bytes);
rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
fprintf(fd, "]\n");
fclose(fd);
#endif
retval = client_read_sslblob(Target, bytes, timeout);
if (retval < 0) {
syslog(LOG_CRIT, "client_read_blob() failed");
}
#ifdef BIGBAD_IODBG
snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
fd = fopen(fn, "a+");
fprintf(fd, "Read: %d BufContent: [",
StrLength(Target));
rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
fprintf(fd, "]\n");
fclose(fd);
#endif
}
else
#endif
{
#ifdef BIGBAD_IODBG
int rv = 0;
char fn [SIZ];
FILE *fd;
snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
fd = fopen(fn, "a+");
fprintf(fd, "Reading BLOB: BufSize: %d ",
bytes);
rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
fprintf(fd, "]\n");
fclose(fd);
#endif
retval = StrBufReadBLOBBuffered(Target,
CCC->RecvBuf.Buf,
&CCC->RecvBuf.ReadWritePointer,
&CCC->client_socket,
1,
bytes,
O_TERM,
&Error);
if (retval < 0) {
syslog(LOG_CRIT, "client_read_blob() failed: %s", Error);
client_close();
return retval;
}
#ifdef BIGBAD_IODBG
snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
fd = fopen(fn, "a+");
fprintf(fd, "Read: %d BufContent: [",
StrLength(Target));
rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
fprintf(fd, "]\n");
fclose(fd);
#endif
}
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;
#ifdef BIGBAD_IODBG
{
int rv = 0;
char fn [SIZ];
FILE *fd;
snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
fd = fopen(fn, "a+");
fprintf(fd, "Read: BufSize: %d BufContent: [",
StrLength(Target));
rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
fprintf(fd, "]\n");
fclose(fd);
}
#endif
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, config.c_sleeping));
}
int CtdlClientGetLine(StrBuf *Target)
{
CitContext *CCC=CC;
const char *Error;
int rc;
FlushStrBuf(Target);
#ifdef HAVE_OPENSSL
if (CCC->redirect_ssl) {
#ifdef BIGBAD_IODBG
char fn [SIZ];
FILE *fd;
int len = 0;
int rlen = 0;
int nlen = 0;
int nrlen = 0;
const char *pch;
snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
fd = fopen(fn, "a+");
pch = ChrPtr(CCC->RecvBuf.Buf);
len = StrLength(CCC->RecvBuf.Buf);
if (CCC->RecvBuf.ReadWritePointer != NULL)
rlen = CCC->RecvBuf.ReadWritePointer - pch;
else
rlen = 0;
/* fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
len, rlen, pch);
*/
fprintf(fd, "\n\n\nSSL1: BufSize: %d BufPos: %d \n_____________________\n",
len, rlen);
#endif
rc = client_readline_sslbuffer(Target,
CCC->RecvBuf.Buf,
&CCC->RecvBuf.ReadWritePointer,
1);
#ifdef BIGBAD_IODBG
pch = ChrPtr(CCC->RecvBuf.Buf);
nlen = StrLength(CCC->RecvBuf.Buf);
if (CCC->RecvBuf.ReadWritePointer != NULL)
nrlen = CCC->RecvBuf.ReadWritePointer - pch;
else
nrlen = 0;
/*
fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
len, nlen, rlen, nrlen, pch);
*/
fprintf(fd, "\n\n\nSSL2: BufSize: was: %d is: %d BufPos: was: %d is: %d \n",
len, nlen, rlen, nrlen);
fprintf(fd, "SSL3: Read: BufSize: %d BufContent: [%s]\n\n*************\n",
StrLength(Target), ChrPtr(Target));
fclose(fd);
if (rc < 0) {
syslog(LOG_CRIT, "CtdlClientGetLine() failed");
}
#endif
return rc;
}
else
#endif
{
#ifdef BIGBAD_IODBG
char fn [SIZ];
FILE *fd;
int len, rlen, nlen, nrlen;
const char *pch;
snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
fd = fopen(fn, "a+");
pch = ChrPtr(CCC->RecvBuf.Buf);
len = StrLength(CCC->RecvBuf.Buf);
if (CCC->RecvBuf.ReadWritePointer != NULL)
rlen = CCC->RecvBuf.ReadWritePointer - pch;
else
rlen = 0;
/* fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
len, rlen, pch);
*/
fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \n_____________________\n",
len, rlen);
#endif
rc = StrBufTCP_read_buffered_line_fast(Target,
CCC->RecvBuf.Buf,
&CCC->RecvBuf.ReadWritePointer,
&CCC->client_socket,
5,
1,
&Error);
#ifdef BIGBAD_IODBG
pch = ChrPtr(CCC->RecvBuf.Buf);
nlen = StrLength(CCC->RecvBuf.Buf);
if (CCC->RecvBuf.ReadWritePointer != NULL)
nrlen = CCC->RecvBuf.ReadWritePointer - pch;
else
nrlen = 0;
/*
fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
len, nlen, rlen, nrlen, pch);
*/
fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \n",
len, nlen, rlen, nrlen);
fprintf(fd, "Read: BufSize: %d BufContent: [%s]\n\n*************\n",
StrLength(Target), ChrPtr(Target));
fclose(fd);
if ((rc < 0) && (Error != NULL)) {
syslog(LOG_CRIT, "CtdlClientGetLine() failed: %s", Error);
}
#endif
return rc;
}
}
/*
* client_getln() ... 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;
/*
* close all protocol master sockets
*/
for (serviceptr = ServiceHookTable; serviceptr != NULL;
serviceptr = serviceptr->next ) {
if (serviceptr->tcp_port > 0)
{
syslog(LOG_INFO, "Closing %d listener on port %d\n",
serviceptr->msock,
serviceptr->tcp_port);
serviceptr->tcp_port = 0;
}
if (serviceptr->sockpath != NULL)
syslog(LOG_INFO, "Closing %d listener on '%s'\n",
serviceptr->msock,
serviceptr->sockpath);
if (serviceptr->msock != -1)
close(serviceptr->msock);
/* 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();
#ifdef HAVE_OPENSSL
destruct_ssl();
#endif
CtdlDestroyProtoHooks();
CtdlDestroyDeleteHooks();
CtdlDestroyXmsgHooks();
CtdlDestroyNetprocHooks();
CtdlDestroyUserHooks();
CtdlDestroyMessageHook();
CtdlDestroyCleanupHooks();
CtdlDestroyFixedOutputHooks();
CtdlDestroySessionHooks();
CtdlDestroyServiceHook();
CtdlDestroyRoomHooks();
CtdlDestroySearchHooks();
CtdlDestroyDebugTable();
#ifdef HAVE_BACKTRACE
/// eCrash_Uninit();
#endif
}
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.
*/
if (chdir(ctdl_run_dir) != 0)
syslog(LOG_EMERG,
"unable to change into directory [%s]: %s",
ctdl_run_dir, strerror(errno));
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_EMERG,
"unable to reopen stdin/out/err %s",
strerror(errno));
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, "Posting crash message\n");
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;
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);
}
}
/*
* 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;
++num_workers;
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_NOTICE, "select() failed: (%s)\n", strerror(errno));
goto do_select;
}
if (errno != EINTR) {
syslog(LOG_EMERG, "Exiting (%s)\n", strerror(errno));
server_shutting_down = 1;
continue;
} else {
#if 0
syslog(LOG_DEBUG, "Interrupted select()\n");
#endif
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, "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_EMERG,
"citserver: Can't set socket to blocking: %s\n",
strerror(errno));
}
/* 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;
/* Determine whether it's a local socket */
if (serviceptr->sockpath != NULL) {
con->is_local_socket = 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 */
++active_workers;
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();
--active_workers;
}
/* If control reaches this point, the server is shutting down */
--num_workers;
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;
}