2 * Copyright (C) 1997 Andre Noll <maan@tuebingen.mpg.de>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file command.c Client authentication and server commands. */
9 #include <netinet/in.h>
10 #include <sys/socket.h>
13 #include <sys/types.h>
15 #include <arpa/inet.h>
24 #include "server.cmdline.h"
37 #include "user_list.h"
38 #include "server.command_list.h"
39 #include "afs.command_list.h"
43 static struct server_command afs_cmds[] = {DEFINE_AFS_CMD_ARRAY};
44 static struct server_command server_cmds[] = {DEFINE_SERVER_CMD_ARRAY};
46 /** Commands including options must be shorter than this. */
47 #define MAX_COMMAND_LEN 32768
50 extern struct misc_meta_data *mmd;
51 extern struct sender senders[];
52 int send_afs_status(struct command_context *cc, int parser_friendly);
54 static void dummy(__a_unused int s)
58 static void mmd_dup(struct misc_meta_data *new_mmd)
60 mutex_lock(mmd_mutex);
62 mutex_unlock(mmd_mutex);
66 * Compute human readable string containing vss status for given integer value.
68 * We don't want to use vss_playing() and friends here because we take a
69 * snapshot of the mmd struct and use the copy for computing the state of the
70 * vss. If the real data were used, we would take the mmd lock for a rather
71 * long time or risk to get an inconsistent view.
73 static char *vss_status_tohuman(unsigned int flags)
75 if (flags & VSS_PLAYING)
76 return para_strdup("playing");
78 return para_strdup("stopped");
79 return para_strdup("paused");
83 * return human readable permission string. Never returns NULL.
85 static char *cmd_perms_itohuman(unsigned int perms)
87 char *msg = para_malloc(5 * sizeof(char));
89 msg[0] = perms & AFS_READ? 'a' : '-';
90 msg[1] = perms & AFS_WRITE? 'A' : '-';
91 msg[2] = perms & VSS_READ? 'v' : '-';
92 msg[3] = perms & VSS_WRITE? 'V' : '-';
100 static char *vss_get_status_flags(unsigned int flags)
102 char *msg = para_malloc(5 * sizeof(char));
104 msg[0] = (flags & VSS_PLAYING)? 'P' : '_';
105 msg[1] = (flags & VSS_NOMORE)? 'O' : '_';
106 msg[2] = (flags & VSS_NEXT)? 'N' : '_';
107 msg[3] = (flags & VSS_REPOS)? 'R' : '_';
112 static unsigned get_status(struct misc_meta_data *nmmd, int parser_friendly,
115 char *status, *flags; /* vss status info */
116 /* nobody updates our version of "now" */
117 long offset = (nmmd->offset + 500) / 1000;
118 struct timeval current_time;
119 struct para_buffer b = {.flags = parser_friendly? PBF_SIZE_PREFIX : 0};
121 /* report real status */
122 status = vss_status_tohuman(nmmd->vss_status_flags);
123 flags = vss_get_status_flags(nmmd->vss_status_flags);
124 clock_get_realtime(¤t_time);
126 * The calls to WRITE_STATUS_ITEM() below never fail because
127 * b->max_size is zero (unlimited), see para_printf(). However, clang
128 * is not smart enough to prove this and complains nevertheless.
129 * Casting the return value to void silences clang.
131 (void)WRITE_STATUS_ITEM(&b, SI_STATUS, "%s\n", status);
132 (void)WRITE_STATUS_ITEM(&b, SI_STATUS_FLAGS, "%s\n", flags);
133 (void)WRITE_STATUS_ITEM(&b, SI_OFFSET, "%li\n", offset);
134 (void)WRITE_STATUS_ITEM(&b, SI_AFS_MODE, "%s\n", mmd->afs_mode_string);
135 (void)WRITE_STATUS_ITEM(&b, SI_STREAM_START, "%lu.%lu\n",
136 (long unsigned)nmmd->stream_start.tv_sec,
137 (long unsigned)nmmd->stream_start.tv_usec);
138 (void)WRITE_STATUS_ITEM(&b, SI_CURRENT_TIME, "%lu.%lu\n",
139 (long unsigned)current_time.tv_sec,
140 (long unsigned)current_time.tv_usec);
147 static int check_sender_args(int argc, char * const * argv, struct sender_command_data *scd)
150 /* this has to match sender.h */
151 const char *subcmds[] = {"add", "delete", "allow", "deny", "on", "off", NULL};
153 scd->sender_num = -1;
155 return -E_COMMAND_SYNTAX;
156 for (i = 0; senders[i].name; i++)
157 if (!strcmp(senders[i].name, argv[1]))
159 PARA_DEBUG_LOG("%d:%s\n", argc, argv[1]);
160 if (!senders[i].name)
161 return -E_COMMAND_SYNTAX;
163 for (i = 0; subcmds[i]; i++)
164 if (!strcmp(subcmds[i], argv[2]))
167 return -E_COMMAND_SYNTAX;
169 if (!senders[scd->sender_num].client_cmds[scd->cmd_num])
170 return -E_SENDER_CMD;
171 switch (scd->cmd_num) {
175 return -E_COMMAND_SYNTAX;
179 if (argc != 4 || parse_cidr(argv[3], scd->host,
180 sizeof(scd->host), &scd->netmask) == NULL)
181 return -E_COMMAND_SYNTAX;
186 return -E_COMMAND_SYNTAX;
187 return parse_fec_url(argv[3], scd);
189 return -E_COMMAND_SYNTAX;
195 * Send a sideband packet through a blocking file descriptor.
197 * \param scc fd and crypto keys.
198 * \param buf The buffer to send.
199 * \param numbytes The size of \a buf.
200 * \param band The sideband designator of this packet.
201 * \param dont_free If true, never deallocate \a buf.
203 * The nonblock flag must be disabled for the file descriptor given by \a scc.
205 * Stream cipher encryption is automatically activated if necessary via the
206 * sideband transformation, depending on the value of \a band.
210 * \sa \ref send_sb_va().
212 int send_sb(struct stream_cipher_context *scc, void *buf, size_t numbytes,
213 int band, bool dont_free)
216 struct sb_context *sbc;
218 sb_transformation trafo = band < SBD_PROCEED? NULL : sc_trafo;
219 struct sb_buffer sbb = SBB_INIT(band, buf, numbytes);
221 sbc = sb_new_send(&sbb, dont_free, trafo, scc->send);
223 ret = sb_get_send_buffers(sbc, iov);
224 ret = xwritev(scc->fd, iov, ret);
227 } while (sb_sent(sbc, ret) == false);
235 * Create a variable sized buffer and send it as a sideband packet.
237 * \param scc Passed to \ref send_sb.
238 * \param band See \ref send_sb.
239 * \param fmt The format string.
241 * \return The return value of the underlying call to \ref send_sb.
243 __printf_3_4 int send_sb_va(struct stream_cipher_context *scc, int band,
244 const char *fmt, ...)
251 ret = xvasprintf(&msg, fmt, ap);
253 return send_sb(scc, msg, ret, band, false);
257 * Send an error message to a client.
259 * \param cc Client info.
260 * \param err The (positive) error code.
262 * \return The return value of the underlying call to send_sb_va().
264 int send_strerror(struct command_context *cc, int err)
266 return send_sb_va(&cc->scc, SBD_ERROR_LOG, "%s\n", para_strerror(err));
270 * Send a sideband packet through a blocking file descriptor.
272 * \param scc fd and crypto keys.
273 * \param expected_band The expected band designator.
274 * \param max_size Passed to \ref sb_new_recv().
275 * \param result Body of the sideband packet is returned here.
277 * If \a expected_band is not \p SBD_ANY, the band designator of the received
278 * sideband packet is compared to \a expected_band and a mismatch is considered
283 int recv_sb(struct stream_cipher_context *scc,
284 enum sb_designator expected_band,
285 size_t max_size, struct iovec *result)
288 struct sb_context *sbc;
290 struct sb_buffer sbb;
291 sb_transformation trafo;
293 trafo = expected_band != SBD_ANY && expected_band < SBD_PROCEED?
295 sbc = sb_new_recv(max_size, trafo, scc->recv);
297 sb_get_recv_buffer(sbc, &iov);
298 ret = recv_bin_buffer(scc->fd, iov.iov_base, iov.iov_len);
303 ret = sb_received(sbc, ret, &sbb);
310 if (expected_band != SBD_ANY && sbb.band != expected_band)
319 static int com_sender(struct command_context *cc)
323 struct sender_command_data scd;
326 for (i = 0; senders[i].name; i++) {
328 ret = xasprintf(&tmp, "%s%s\n", msg? msg : "",
333 return send_sb(&cc->scc, msg, ret, SBD_OUTPUT, false);
335 ret = check_sender_args(cc->argc, cc->argv, &scd);
337 if (scd.sender_num < 0)
339 if (strcmp(cc->argv[2], "status") == 0)
340 msg = senders[scd.sender_num].status();
342 msg = senders[scd.sender_num].help();
343 return send_sb(&cc->scc, msg, strlen(msg), SBD_OUTPUT, false);
346 switch (scd.cmd_num) {
349 assert(senders[scd.sender_num].resolve_target);
350 ret = senders[scd.sender_num].resolve_target(cc->argv[3], &scd);
355 for (i = 0; i < 10; i++) {
356 mutex_lock(mmd_mutex);
357 if (mmd->sender_cmd_data.cmd_num >= 0) {
358 /* another sender command is active, retry in 100ms */
359 struct timespec ts = {.tv_nsec = 100 * 1000 * 1000};
360 mutex_unlock(mmd_mutex);
361 nanosleep(&ts, NULL);
364 mmd->sender_cmd_data = scd;
365 mutex_unlock(mmd_mutex);
368 return (i < 10)? 1 : -E_LOCK;
372 static int com_si(struct command_context *cc)
378 return -E_COMMAND_SYNTAX;
379 mutex_lock(mmd_mutex);
380 ut = daemon_get_uptime_str(now);
381 ret = xasprintf(&msg,
382 "up: %s\nplayed: %u\n"
385 "connections (active/accepted/total): %u/%u/%u\n"
386 "current loglevel: %s\n"
387 "supported audio formats: %s\n",
391 mmd->active_connections,
395 AUDIO_FORMAT_HANDLERS
397 mutex_unlock(mmd_mutex);
399 return send_sb(&cc->scc, msg, ret, SBD_OUTPUT, false);
403 static int com_version(struct command_context *cc)
409 return -E_COMMAND_SYNTAX;
410 len = xasprintf(&msg, "%s", version_text("server"));
411 return send_sb(&cc->scc, msg, len, SBD_OUTPUT, false);
414 /** These status items are cleared if no audio file is currently open. */
415 #define EMPTY_STATUS_ITEMS \
420 ITEM(ATTRIBUTES_BITMAP) \
421 ITEM(ATTRIBUTES_TXT) \
432 ITEM(SECONDS_TOTAL) \
445 ITEM(AMPLIFICATION) \
448 * Write a list of audio-file related status items with empty values.
450 * This is used by vss when currently no audio file is open.
452 static unsigned empty_status_items(int parser_friendly, char **result)
458 len = xasprintf(&esi,
459 #define ITEM(x) "0004 %02x:\n"
462 #define ITEM(x) , SI_ ## x
467 len = xasprintf(&esi,
468 #define ITEM(x) "%s:\n"
471 #define ITEM(x) ,status_item_list[SI_ ## x]
478 #undef EMPTY_STATUS_ITEMS
481 static int com_stat(struct command_context *cc)
484 struct misc_meta_data tmp, *nmmd = &tmp;
487 int parser_friendly = 0;
489 para_sigaction(SIGUSR1, dummy);
491 for (i = 1; i < cc->argc; i++) {
492 const char *arg = cc->argv[i];
495 if (!strcmp(arg, "--")) {
499 if (!strncmp(arg, "-n=", 3)) {
500 ret = para_atoi32(arg + 3, &num);
505 if (!strcmp(arg, "-p")) {
509 return -E_COMMAND_SYNTAX;
512 return -E_COMMAND_SYNTAX;
515 ret = get_status(nmmd, parser_friendly, &s);
516 ret = send_sb(&cc->scc, s, ret, SBD_OUTPUT, false);
519 if (nmmd->vss_status_flags & VSS_NEXT) {
521 ret = empty_status_items(parser_friendly, &esi);
522 ret = send_sb(&cc->scc, esi, ret, SBD_OUTPUT, false);
526 send_afs_status(cc, parser_friendly);
528 if (num > 0 && !--num)
531 ret = -E_SERVER_CRASH;
539 static int send_list_of_commands(struct command_context *cc, struct server_command *cmd,
544 for (; cmd->name; cmd++) {
545 char *tmp, *perms = cmd_perms_itohuman(cmd->perms);
546 tmp = make_message("%s\t%s\t%s\t%s\n", cmd->name, handler,
547 perms, cmd->description);
549 msg = para_strcat(msg, tmp);
553 return send_sb(&cc->scc, msg, strlen(msg), SBD_OUTPUT, false);
556 /* returns string that must be freed by the caller */
557 static struct server_command *get_cmd_ptr(const char *name, char **handler)
559 struct server_command *cmd;
561 for (cmd = server_cmds; cmd->name; cmd++)
562 if (!strcmp(cmd->name, name)) {
564 *handler = para_strdup("server"); /* server commands */
567 /* not found, look for commands supported by afs */
568 for (cmd = afs_cmds; cmd->name; cmd++)
569 if (!strcmp(cmd->name, name)) {
571 *handler = para_strdup("afs");
578 static int com_help(struct command_context *cc)
580 struct server_command *cmd;
581 char *perms, *handler, *buf;
585 /* no argument given, print list of commands */
586 if ((ret = send_list_of_commands(cc, server_cmds, "server")) < 0)
588 return send_list_of_commands(cc, afs_cmds, "afs");
590 /* argument given for help */
591 cmd = get_cmd_ptr(cc->argv[1], &handler);
594 perms = cmd_perms_itohuman(cmd->perms);
595 ret = xasprintf(&buf, "%s - %s\n\n"
609 return send_sb(&cc->scc, buf, ret, SBD_OUTPUT, false);
613 static int com_hup(struct command_context *cc)
616 return -E_COMMAND_SYNTAX;
617 kill(getppid(), SIGHUP);
622 static int com_term(struct command_context *cc)
625 return -E_COMMAND_SYNTAX;
626 kill(getppid(), SIGTERM);
630 static int com_play(struct command_context *cc)
633 return -E_COMMAND_SYNTAX;
634 mutex_lock(mmd_mutex);
635 mmd->new_vss_status_flags |= VSS_PLAYING;
636 mmd->new_vss_status_flags &= ~VSS_NOMORE;
637 mutex_unlock(mmd_mutex);
642 static int com_stop(struct command_context *cc)
645 return -E_COMMAND_SYNTAX;
646 mutex_lock(mmd_mutex);
647 mmd->new_vss_status_flags &= ~VSS_PLAYING;
648 mmd->new_vss_status_flags &= ~VSS_REPOS;
649 mmd->new_vss_status_flags |= VSS_NEXT;
650 mutex_unlock(mmd_mutex);
655 static int com_pause(struct command_context *cc)
658 return -E_COMMAND_SYNTAX;
659 mutex_lock(mmd_mutex);
660 if (!vss_paused() && !vss_stopped()) {
662 mmd->new_vss_status_flags &= ~VSS_PLAYING;
663 mmd->new_vss_status_flags &= ~VSS_NEXT;
665 mutex_unlock(mmd_mutex);
670 static int com_next(struct command_context *cc)
673 return -E_COMMAND_SYNTAX;
674 mutex_lock(mmd_mutex);
676 mmd->new_vss_status_flags |= VSS_NEXT;
677 mutex_unlock(mmd_mutex);
682 static int com_nomore(struct command_context *cc)
685 return -E_COMMAND_SYNTAX;
686 mutex_lock(mmd_mutex);
687 if (vss_playing() || vss_paused())
688 mmd->new_vss_status_flags |= VSS_NOMORE;
689 mutex_unlock(mmd_mutex);
694 static int com_ff(struct command_context *cc)
697 int ret, backwards = 0;
702 return -E_COMMAND_SYNTAX;
703 if (!(ret = sscanf(cc->argv[1], "%u%c", &i, &c)))
704 return -E_COMMAND_SYNTAX;
705 if (ret > 1 && c == '-')
706 backwards = 1; /* jmp backwards */
707 mutex_lock(mmd_mutex);
708 ret = -E_NO_AUDIO_FILE;
709 if (!mmd->afd.afhi.chunks_total || !mmd->afd.afhi.seconds_total)
711 promille = (1000 * mmd->current_chunk) / mmd->afd.afhi.chunks_total;
713 promille -= 1000 * i / mmd->afd.afhi.seconds_total;
715 promille += 1000 * i / mmd->afd.afhi.seconds_total;
718 if (promille > 1000) {
719 mmd->new_vss_status_flags |= VSS_NEXT;
722 mmd->repos_request = (mmd->afd.afhi.chunks_total * promille) / 1000;
723 mmd->new_vss_status_flags |= VSS_REPOS;
724 mmd->new_vss_status_flags &= ~VSS_NEXT;
728 mutex_unlock(mmd_mutex);
733 static int com_jmp(struct command_context *cc)
739 return -E_COMMAND_SYNTAX;
740 if (sscanf(cc->argv[1], "%lu", &i) <= 0)
741 return -E_COMMAND_SYNTAX;
742 mutex_lock(mmd_mutex);
743 ret = -E_NO_AUDIO_FILE;
744 if (!mmd->afd.afhi.chunks_total)
748 PARA_INFO_LOG("jumping to %lu%%\n", i);
749 mmd->repos_request = (mmd->afd.afhi.chunks_total * i + 50) / 100;
750 PARA_INFO_LOG("sent: %lu, offset before jmp: %lu\n",
751 mmd->chunks_sent, mmd->offset);
752 mmd->new_vss_status_flags |= VSS_REPOS;
753 mmd->new_vss_status_flags &= ~VSS_NEXT;
757 mutex_unlock(mmd_mutex);
761 static int com_tasks(struct command_context *cc)
763 char *tl = server_get_tasks();
767 ret = send_sb(&cc->scc, tl, strlen(tl), SBD_OUTPUT, false);
772 * check if perms are sufficient to exec a command having perms cmd_perms.
773 * Returns 0 if perms are sufficient, -E_PERM otherwise.
775 static int check_perms(unsigned int perms, const struct server_command *cmd_ptr)
777 PARA_DEBUG_LOG("checking permissions\n");
778 return (cmd_ptr->perms & perms) < cmd_ptr->perms ? -E_PERM : 0;
781 static void reset_signals(void)
783 para_sigaction(SIGCHLD, SIG_IGN);
784 para_sigaction(SIGINT, SIG_DFL);
785 para_sigaction(SIGTERM, SIG_DFL);
786 para_sigaction(SIGHUP, SIG_DFL);
789 struct connection_features {
790 bool sideband_requested;
791 bool aes_ctr128_requested;
794 static int parse_auth_request(char *buf, int len, struct user **u,
795 struct connection_features *cf)
798 char *p, *username, **features = NULL;
799 size_t auth_rq_len = strlen(AUTH_REQUEST_MSG);
802 memset(cf, 0, sizeof(*cf));
803 if (len < auth_rq_len + 2)
804 return -E_AUTH_REQUEST;
805 if (strncmp(buf, AUTH_REQUEST_MSG, auth_rq_len) != 0)
806 return -E_AUTH_REQUEST;
807 username = buf + auth_rq_len;
808 p = strchr(username, ' ');
812 return -E_AUTH_REQUEST;
815 create_argv(p, ",", &features);
816 for (i = 0; features[i]; i++) {
817 if (strcmp(features[i], "sideband") == 0)
818 cf->sideband_requested = true;
819 else if (strcmp(features[i], "aes_ctr128") == 0)
820 cf->aes_ctr128_requested = true;
822 ret = -E_BAD_FEATURE;
827 PARA_DEBUG_LOG("received auth request for user %s\n", username);
828 *u = lookup_user(username);
835 #define HANDSHAKE_BUFSIZE 4096
837 static int parse_sb_command(struct command_context *cc, struct iovec *iov)
843 if (iov->iov_base == NULL || iov->iov_len == 0)
846 p[iov->iov_len - 1] = '\0'; /* just to be sure */
847 cc->cmd = get_cmd_ptr(p, NULL);
850 ret = check_perms(cc->u->perms, cc->cmd);
853 end = iov->iov_base + iov->iov_len;
854 for (i = 0; p < end; i++)
857 cc->argv = para_malloc((cc->argc + 1) * sizeof(char *));
858 for (i = 0, p = iov->iov_base; p < end; i++) {
859 cc->argv[i] = para_strdup(p);
862 cc->argv[cc->argc] = NULL;
870 * Perform user authentication and execute a command.
872 * \param fd The file descriptor to send output to.
873 * \param peername Identifies the connecting peer.
875 * Whenever para_server accepts an incoming tcp connection on the port it
876 * listens on, it forks and the resulting child calls this function.
878 * An RSA-based challenge/response is used to authenticate the peer. It that
879 * authentication succeeds, a random session key is generated and sent back to
880 * the peer, encrypted with its RSA public key. From this point on, all
881 * transfers are crypted with this session key.
883 * Next it is checked if the peer supplied a valid server command or a command
884 * for the audio file selector. If yes, and if the user has sufficient
885 * permissions to execute that command, the function calls the corresponding
886 * command handler which does argument checking and further processing.
888 * In order to cope with a DOS attacks, a timeout is set up which terminates
889 * the function if the connection was not authenticated when the timeout
892 * \sa alarm(2), crypt.c, crypt.h
894 __noreturn void handle_connect(int fd, const char *peername)
897 unsigned char rand_buf[CHALLENGE_SIZE + 2 * SESSION_KEY_LEN];
898 unsigned char challenge_hash[HASH_SIZE];
899 char *command = NULL, *buf = para_malloc(HANDSHAKE_BUFSIZE) /* must be on the heap */;
901 struct command_context cc_struct = {.peer = peername}, *cc = &cc_struct;
903 struct connection_features cf;
907 /* we need a blocking fd here as recv() might return EAGAIN otherwise. */
908 ret = mark_fd_blocking(fd);
911 /* send Welcome message */
912 ret = write_va_buffer(fd, "This is para_server, version "
913 PACKAGE_VERSION ".\n"
914 "Features: sideband,aes_ctr128\n"
918 /* recv auth request line */
919 ret = recv_buffer(fd, buf, HANDSHAKE_BUFSIZE);
922 ret = parse_auth_request(buf, ret, &cc->u, &cf);
925 if (!cf.sideband_requested) { /* sideband is mandatory */
926 PARA_ERROR_LOG("client did not request sideband\n");
927 ret = -E_BAD_FEATURE;
931 get_random_bytes_or_die(rand_buf, sizeof(rand_buf));
932 ret = pub_encrypt(cc->u->pubkey, rand_buf, sizeof(rand_buf),
933 (unsigned char *)buf);
939 * We don't want to reveal our user names, so we send a
940 * challenge to the client even if the user does not exist, and
941 * fail the authentication later.
944 get_random_bytes_or_die((unsigned char *)buf, numbytes);
946 PARA_DEBUG_LOG("sending %u byte challenge + session key (%zu bytes)\n",
947 CHALLENGE_SIZE, numbytes);
948 ret = send_sb(&cc->scc, buf, numbytes, SBD_CHALLENGE, false);
952 ret = recv_sb(&cc->scc, SBD_CHALLENGE_RESPONSE,
953 HANDSHAKE_BUFSIZE, &iov);
957 numbytes = iov.iov_len;
958 PARA_DEBUG_LOG("received %zu bytes challenge response\n", numbytes);
963 * The correct response is the hash of the first CHALLENGE_SIZE bytes
964 * of the random data.
967 if (numbytes != HASH_SIZE)
969 hash_function((char *)rand_buf, CHALLENGE_SIZE, challenge_hash);
970 if (memcmp(challenge_hash, buf, HASH_SIZE))
972 /* auth successful */
974 PARA_INFO_LOG("good auth for %s\n", cc->u->name);
975 /* init stream cipher keys with the second part of the random buffer */
976 cc->scc.recv = sc_new(rand_buf + CHALLENGE_SIZE, SESSION_KEY_LEN,
977 cf.aes_ctr128_requested);
978 cc->scc.send = sc_new(rand_buf + CHALLENGE_SIZE + SESSION_KEY_LEN,
979 SESSION_KEY_LEN, cf.aes_ctr128_requested);
980 ret = send_sb(&cc->scc, NULL, 0, SBD_PROCEED, false);
983 ret = recv_sb(&cc->scc, SBD_COMMAND, MAX_COMMAND_LEN, &iov);
986 ret = parse_sb_command(cc, &iov);
990 PARA_NOTICE_LOG("calling com_%s() for %s@%s\n", cc->cmd->name,
991 cc->u->name, peername);
992 ret = cc->cmd->handler(cc);
994 mutex_lock(mmd_mutex);
996 mutex_unlock(mmd_mutex);
1000 if (send_strerror(cc, -ret) >= 0)
1001 send_sb(&cc->scc, NULL, 0, SBD_EXIT__FAILURE, true);
1003 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
1007 mutex_lock(mmd_mutex);
1008 if (cc->cmd && (cc->cmd->perms & AFS_WRITE) && ret >= 0)
1010 mmd->active_connections--;
1011 mutex_unlock(mmd_mutex);
1013 ret = send_sb(&cc->scc, NULL, 0, SBD_EXIT__SUCCESS, true);
1015 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
1017 sc_free(cc->scc.recv);
1018 sc_free(cc->scc.send);
1019 exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);