2 * Copyright (C) 1997-2014 Andre Noll <maan@systemlinux.org>
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,
116 char *status, *flags; /* vss status info */
117 /* nobody updates our version of "now" */
118 long offset = (nmmd->offset + 500) / 1000;
119 struct timeval current_time;
121 struct para_buffer b = {.flags = parser_friendly? PBF_SIZE_PREFIX : 0};
123 /* report real status */
124 status = vss_status_tohuman(nmmd->vss_status_flags);
125 flags = vss_get_status_flags(nmmd->vss_status_flags);
126 if (nmmd->size) { /* parent currently has an audio file open */
127 localtime_r(&nmmd->mtime, &mtime_tm);
128 strftime(mtime, 29, "%b %d %Y", &mtime_tm);
130 clock_get_realtime(¤t_time);
132 * The calls to WRITE_STATUS_ITEM() below never fail because
133 * b->max_size is zero (unlimited), see para_printf(). However, clang
134 * is not smart enough to prove this and complains nevertheless.
135 * Casting the return value to void silences clang.
137 (void)WRITE_STATUS_ITEM(&b, SI_FILE_SIZE, "%zu\n", nmmd->size / 1024);
138 (void)WRITE_STATUS_ITEM(&b, SI_MTIME, "%s\n", mtime);
139 (void)WRITE_STATUS_ITEM(&b, SI_STATUS, "%s\n", status);
140 (void)WRITE_STATUS_ITEM(&b, SI_STATUS_FLAGS, "%s\n", flags);
141 (void)WRITE_STATUS_ITEM(&b, SI_OFFSET, "%li\n", offset);
142 (void)WRITE_STATUS_ITEM(&b, SI_AFS_MODE, "%s\n", mmd->afs_mode_string);
143 (void)WRITE_STATUS_ITEM(&b, SI_STREAM_START, "%lu.%lu\n",
144 (long unsigned)nmmd->stream_start.tv_sec,
145 (long unsigned)nmmd->stream_start.tv_usec);
146 (void)WRITE_STATUS_ITEM(&b, SI_CURRENT_TIME, "%lu.%lu\n",
147 (long unsigned)current_time.tv_sec,
148 (long unsigned)current_time.tv_usec);
155 static int check_sender_args(int argc, char * const * argv, struct sender_command_data *scd)
158 /* this has to match sender.h */
159 const char *subcmds[] = {"add", "delete", "allow", "deny", "on", "off", NULL};
161 scd->sender_num = -1;
163 return -E_COMMAND_SYNTAX;
164 for (i = 0; senders[i].name; i++)
165 if (!strcmp(senders[i].name, argv[1]))
167 PARA_DEBUG_LOG("%d:%s\n", argc, argv[1]);
168 if (!senders[i].name)
169 return -E_COMMAND_SYNTAX;
171 for (i = 0; subcmds[i]; i++)
172 if (!strcmp(subcmds[i], argv[2]))
175 return -E_COMMAND_SYNTAX;
177 if (!senders[scd->sender_num].client_cmds[scd->cmd_num])
178 return -E_SENDER_CMD;
179 switch (scd->cmd_num) {
183 return -E_COMMAND_SYNTAX;
187 if (argc != 4 || parse_cidr(argv[3], scd->host,
188 sizeof(scd->host), &scd->netmask) == NULL)
189 return -E_COMMAND_SYNTAX;
194 return -E_COMMAND_SYNTAX;
195 return parse_fec_url(argv[3], scd);
197 return -E_COMMAND_SYNTAX;
203 * Send a sideband packet through a blocking file descriptor.
205 * \param scc fd and crypto keys.
206 * \param buf The buffer to send.
207 * \param numbytes The size of \a buf.
208 * \param band The sideband designator of this packet.
209 * \param dont_free If true, never deallocate \a buf.
211 * The nonblock flag must be disabled for the file descriptor given by \a scc.
213 * Stream cipher encryption is automatically activated if neccessary via the
214 * sideband transformation, depending on the value of \a band.
218 * \sa \ref send_sb_va().
220 int send_sb(struct stream_cipher_context *scc, void *buf, size_t numbytes,
221 int band, bool dont_free)
224 struct sb_context *sbc;
226 sb_transformation trafo = band < SBD_PROCEED? NULL : sc_trafo;
227 struct sb_buffer sbb = SBB_INIT(band, buf, numbytes);
229 sbc = sb_new_send(&sbb, dont_free, trafo, scc->send);
231 ret = sb_get_send_buffers(sbc, iov);
232 ret = xwritev(scc->fd, iov, ret);
235 } while (sb_sent(sbc, ret) == false);
243 * Create a variable sized buffer and send it as a sideband packet.
245 * \param scc Passed to \ref send_sb.
246 * \param band See \ref send_sb.
247 * \param fmt The format string.
249 * \return The return value of the underlying call to \ref send_sb.
251 __printf_3_4 int send_sb_va(struct stream_cipher_context *scc, int band,
252 const char *fmt, ...)
259 ret = xvasprintf(&msg, fmt, ap);
261 return send_sb(scc, msg, ret, band, false);
265 * Send an error message to a client.
267 * \param cc Client info.
268 * \param err The (positive) error code.
270 * \return The return value of the underlying call to send_sb_va().
272 int send_strerror(struct command_context *cc, int err)
274 return send_sb_va(&cc->scc, SBD_ERROR_LOG, "%s\n", para_strerror(err));
278 * Send a sideband packet through a blocking file descriptor.
280 * \param scc fd and crypto keys.
281 * \param expected_band The expected band designator.
282 * \param max_size Passed to \ref sb_new_recv().
283 * \param result Body of the sideband packet is returned here.
285 * If \a expected_band is not \p SBD_ANY, the band designator of the received
286 * sideband packet is compared to \a expected_band and a mismatch is considered
291 int recv_sb(struct stream_cipher_context *scc,
292 enum sb_designator expected_band,
293 size_t max_size, struct iovec *result)
296 struct sb_context *sbc;
298 struct sb_buffer sbb;
299 sb_transformation trafo;
301 trafo = expected_band != SBD_ANY && expected_band < SBD_PROCEED?
303 sbc = sb_new_recv(max_size, trafo, scc->recv);
305 sb_get_recv_buffer(sbc, &iov);
306 ret = recv_bin_buffer(scc->fd, iov.iov_base, iov.iov_len);
311 ret = sb_received(sbc, ret, &sbb);
318 if (expected_band != SBD_ANY && sbb.band != expected_band)
327 static int com_sender(struct command_context *cc)
331 struct sender_command_data scd;
334 for (i = 0; senders[i].name; i++) {
336 ret = xasprintf(&tmp, "%s%s\n", msg? msg : "",
341 return send_sb(&cc->scc, msg, ret, SBD_OUTPUT, false);
343 ret = check_sender_args(cc->argc, cc->argv, &scd);
345 if (scd.sender_num < 0)
347 msg = senders[scd.sender_num].help();
348 return send_sb(&cc->scc, msg, strlen(msg), SBD_OUTPUT, false);
351 switch (scd.cmd_num) {
354 assert(senders[scd.sender_num].resolve_target);
355 ret = senders[scd.sender_num].resolve_target(cc->argv[3], &scd);
360 for (i = 0; i < 10; i++) {
361 mutex_lock(mmd_mutex);
362 if (mmd->sender_cmd_data.cmd_num >= 0) {
363 mutex_unlock(mmd_mutex);
367 memcpy(&mmd->sender_cmd_data, &scd, sizeof(scd));
368 mutex_unlock(mmd_mutex);
371 return (i < 10)? 1 : -E_LOCK;
375 static int com_si(struct command_context *cc)
378 char *msg, *ut, *sender_info = NULL;
381 return -E_COMMAND_SYNTAX;
382 mutex_lock(mmd_mutex);
383 for (i = 0; senders[i].name; i++) {
384 char *info = senders[i].info();
385 sender_info = para_strcat(sender_info, info);
388 ut = get_server_uptime_str(now);
389 ret = xasprintf(&msg,
391 "up: %s\nplayed: %u\n"
394 "connections (active/accepted/total): %u/%u/%u\n"
395 "current loglevel: %s\n"
396 "supported audio formats: %s\n"
402 mmd->active_connections,
406 AUDIO_FORMAT_HANDLERS,
409 mutex_unlock(mmd_mutex);
412 return send_sb(&cc->scc, msg, ret, SBD_OUTPUT, false);
416 static int com_version(struct command_context *cc)
422 return -E_COMMAND_SYNTAX;
423 len = xasprintf(&msg, "%s", version_text("server"));
424 return send_sb(&cc->scc, msg, len, SBD_OUTPUT, false);
427 #define EMPTY_STATUS_ITEMS \
432 ITEM(ATTRIBUTES_BITMAP) \
433 ITEM(ATTRIBUTES_TXT) \
444 ITEM(SECONDS_TOTAL) \
456 * Write a list of audio-file related status items with empty values.
458 * This is used by vss when currently no audio file is open.
460 static unsigned empty_status_items(int parser_friendly, char **result)
466 len = xasprintf(&esi,
467 #define ITEM(x) "0004 %02x:\n"
470 #define ITEM(x) , SI_ ## x
475 len = xasprintf(&esi,
476 #define ITEM(x) "%s:\n"
479 #define ITEM(x) ,status_item_list[SI_ ## x]
486 #undef EMPTY_STATUS_ITEMS
489 static int com_stat(struct command_context *cc)
492 struct misc_meta_data tmp, *nmmd = &tmp;
495 int parser_friendly = 0;
497 para_sigaction(SIGUSR1, dummy);
499 for (i = 1; i < cc->argc; i++) {
500 const char *arg = cc->argv[i];
503 if (!strcmp(arg, "--")) {
507 if (!strncmp(arg, "-n=", 3)) {
508 ret = para_atoi32(arg + 3, &num);
513 if (!strcmp(arg, "-p")) {
517 return -E_COMMAND_SYNTAX;
520 return -E_COMMAND_SYNTAX;
523 ret = get_status(nmmd, parser_friendly, &s);
524 ret = send_sb(&cc->scc, s, ret, SBD_OUTPUT, false);
527 if (nmmd->vss_status_flags & VSS_NEXT) {
529 ret = empty_status_items(parser_friendly, &esi);
530 ret = send_sb(&cc->scc, esi, ret, SBD_OUTPUT, false);
534 send_afs_status(cc, parser_friendly);
536 if (num > 0 && !--num)
539 ret = -E_SERVER_CRASH;
547 static int send_list_of_commands(struct command_context *cc, struct server_command *cmd,
552 for (; cmd->name; cmd++) {
553 char *tmp, *perms = cmd_perms_itohuman(cmd->perms);
554 tmp = make_message("%s\t%s\t%s\t%s\n", cmd->name, handler,
555 perms, cmd->description);
557 msg = para_strcat(msg, tmp);
561 return send_sb(&cc->scc, msg, strlen(msg), SBD_OUTPUT, false);
564 /* returns string that must be freed by the caller */
565 static struct server_command *get_cmd_ptr(const char *name, char **handler)
567 struct server_command *cmd;
569 for (cmd = server_cmds; cmd->name; cmd++)
570 if (!strcmp(cmd->name, name)) {
572 *handler = para_strdup("server"); /* server commands */
575 /* not found, look for commands supported by afs */
576 for (cmd = afs_cmds; cmd->name; cmd++)
577 if (!strcmp(cmd->name, name)) {
579 *handler = para_strdup("afs");
586 static int com_help(struct command_context *cc)
588 struct server_command *cmd;
589 char *perms, *handler, *buf;
593 /* no argument given, print list of commands */
594 if ((ret = send_list_of_commands(cc, server_cmds, "server")) < 0)
596 return send_list_of_commands(cc, afs_cmds, "afs");
598 /* argument given for help */
599 cmd = get_cmd_ptr(cc->argv[1], &handler);
602 perms = cmd_perms_itohuman(cmd->perms);
603 ret = xasprintf(&buf, "%s - %s\n\n"
617 return send_sb(&cc->scc, buf, ret, SBD_OUTPUT, false);
621 static int com_hup(struct command_context *cc)
624 return -E_COMMAND_SYNTAX;
625 kill(getppid(), SIGHUP);
630 static int com_term(struct command_context *cc)
633 return -E_COMMAND_SYNTAX;
634 kill(getppid(), SIGTERM);
638 static int com_play(struct command_context *cc)
641 return -E_COMMAND_SYNTAX;
642 mutex_lock(mmd_mutex);
643 mmd->new_vss_status_flags |= VSS_PLAYING;
644 mmd->new_vss_status_flags &= ~VSS_NOMORE;
645 mutex_unlock(mmd_mutex);
650 static int com_stop(struct command_context *cc)
653 return -E_COMMAND_SYNTAX;
654 mutex_lock(mmd_mutex);
655 mmd->new_vss_status_flags &= ~VSS_PLAYING;
656 mmd->new_vss_status_flags &= ~VSS_REPOS;
657 mmd->new_vss_status_flags |= VSS_NEXT;
658 mutex_unlock(mmd_mutex);
663 static int com_pause(struct command_context *cc)
666 return -E_COMMAND_SYNTAX;
667 mutex_lock(mmd_mutex);
668 if (!vss_paused() && !vss_stopped()) {
670 mmd->new_vss_status_flags &= ~VSS_PLAYING;
671 mmd->new_vss_status_flags &= ~VSS_NEXT;
673 mutex_unlock(mmd_mutex);
678 static int com_next(struct command_context *cc)
681 return -E_COMMAND_SYNTAX;
682 mutex_lock(mmd_mutex);
684 mmd->new_vss_status_flags |= VSS_NEXT;
685 mutex_unlock(mmd_mutex);
690 static int com_nomore(struct command_context *cc)
693 return -E_COMMAND_SYNTAX;
694 mutex_lock(mmd_mutex);
695 if (vss_playing() || vss_paused())
696 mmd->new_vss_status_flags |= VSS_NOMORE;
697 mutex_unlock(mmd_mutex);
702 static int com_ff(struct command_context *cc)
705 int ret, backwards = 0;
710 return -E_COMMAND_SYNTAX;
711 if (!(ret = sscanf(cc->argv[1], "%u%c", &i, &c)))
712 return -E_COMMAND_SYNTAX;
713 if (ret > 1 && c == '-')
714 backwards = 1; /* jmp backwards */
715 mutex_lock(mmd_mutex);
716 ret = -E_NO_AUDIO_FILE;
717 if (!mmd->afd.afhi.chunks_total || !mmd->afd.afhi.seconds_total)
719 promille = (1000 * mmd->current_chunk) / mmd->afd.afhi.chunks_total;
721 promille -= 1000 * i / mmd->afd.afhi.seconds_total;
723 promille += 1000 * i / mmd->afd.afhi.seconds_total;
726 if (promille > 1000) {
727 mmd->new_vss_status_flags |= VSS_NEXT;
730 mmd->repos_request = (mmd->afd.afhi.chunks_total * promille) / 1000;
731 mmd->new_vss_status_flags |= VSS_REPOS;
732 mmd->new_vss_status_flags &= ~VSS_NEXT;
736 mutex_unlock(mmd_mutex);
741 static int com_jmp(struct command_context *cc)
747 return -E_COMMAND_SYNTAX;
748 if (sscanf(cc->argv[1], "%lu", &i) <= 0)
749 return -E_COMMAND_SYNTAX;
750 mutex_lock(mmd_mutex);
751 ret = -E_NO_AUDIO_FILE;
752 if (!mmd->afd.afhi.chunks_total)
756 PARA_INFO_LOG("jumping to %lu%%\n", i);
757 mmd->repos_request = (mmd->afd.afhi.chunks_total * i + 50)/ 100;
758 PARA_INFO_LOG("sent: %lu, offset before jmp: %lu\n",
759 mmd->chunks_sent, mmd->offset);
760 mmd->new_vss_status_flags |= VSS_REPOS;
761 mmd->new_vss_status_flags &= ~VSS_NEXT;
765 mutex_unlock(mmd_mutex);
770 * check if perms are sufficient to exec a command having perms cmd_perms.
771 * Returns 0 if perms are sufficient, -E_PERM otherwise.
773 static int check_perms(unsigned int perms, struct server_command *cmd_ptr)
775 PARA_DEBUG_LOG("checking permissions\n");
776 return (cmd_ptr->perms & perms) < cmd_ptr->perms ? -E_PERM : 0;
779 static void reset_signals(void)
781 para_sigaction(SIGCHLD, SIG_IGN);
782 para_sigaction(SIGINT, SIG_DFL);
783 para_sigaction(SIGTERM, SIG_DFL);
784 para_sigaction(SIGHUP, SIG_DFL);
787 struct connection_features {
788 bool sideband_requested;
789 bool aes_ctr128_requested;
792 static int parse_auth_request(char *buf, int len, struct user **u,
793 struct connection_features *cf)
796 char *p, *username, **features = NULL;
797 size_t auth_rq_len = strlen(AUTH_REQUEST_MSG);
800 memset(cf, 0, sizeof(*cf));
801 if (len < auth_rq_len + 2)
802 return -E_AUTH_REQUEST;
803 if (strncmp(buf, AUTH_REQUEST_MSG, auth_rq_len) != 0)
804 return -E_AUTH_REQUEST;
805 username = buf + auth_rq_len;
806 p = strchr(username, ' ');
810 return -E_AUTH_REQUEST;
813 create_argv(p, ",", &features);
814 for (i = 0; features[i]; i++) {
815 if (strcmp(features[i], "sideband") == 0)
816 cf->sideband_requested = true;
817 else if (strcmp(features[i], "aes_ctr128") == 0)
818 cf->aes_ctr128_requested = true;
820 ret = -E_BAD_FEATURE;
825 PARA_DEBUG_LOG("received auth request for user %s\n", username);
826 *u = lookup_user(username);
833 #define HANDSHAKE_BUFSIZE 4096
835 static int parse_sb_command(struct command_context *cc, struct iovec *iov)
841 if (iov->iov_base == NULL || iov->iov_len == 0)
844 p[iov->iov_len - 1] = '\0'; /* just to be sure */
845 cc->cmd = get_cmd_ptr(p, NULL);
848 ret = check_perms(cc->u->perms, cc->cmd);
851 end = iov->iov_base + iov->iov_len;
852 for (i = 0; p < end; i++)
855 cc->argv = para_malloc((cc->argc + 1) * sizeof(char *));
856 for (i = 0, p = iov->iov_base; p < end; i++) {
857 cc->argv[i] = para_strdup(p);
860 cc->argv[cc->argc] = NULL;
868 * Perform user authentication and execute a command.
870 * \param fd The file descriptor to send output to.
871 * \param peername Identifies the connecting peer.
873 * Whenever para_server accepts an incoming tcp connection on
874 * the port it listens on, it forks and the resulting child
875 * calls this function.
877 * An RSA-based challenge/response is used to authenticate
878 * the peer. It that authentication succeeds, a random
879 * session key is generated and sent back to the peer,
880 * encrypted with its RSA public key. From this point on,
881 * all 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
889 * which terminates the function if the connection was not
890 * authenticated when the timeout expires.
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);