citadel/utils/sendcommand.c

   1 /*
   2  * Command-line utility to transmit a server command.
   3  *
   4  * Copyright (c) 1987-2010 by the citadel.org team
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "ctdl_module.h"
  22
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25 #include <sys/types.h>
  26 #include <sys/wait.h>
  27 #include <string.h>
  28 #include <fcntl.h>
  29 #include <stdio.h>
  30 #include <ctype.h>
  31
  32 #if TIME_WITH_SYS_TIME
  33 # include <sys/time.h>
  34 # include <time.h>
  35 #else
  36 # if HAVE_SYS_TIME_H
  37 #  include <sys/time.h>
  38 # else
  39 #  include <time.h>
  40 # endif
  41 #endif
  42
  43 #include <signal.h>
  44 #include <errno.h>
  45 #include <limits.h>
  46 #include <libcitadel.h>
  47 #include "citadel.h"
  48 #include "citadel_ipc.h"
  49 #include "server.h"
  50 #include "config.h"
  51
  52 #define LOCKFILE "/tmp/LCK.sendcommand"
  53
  54 static CtdlIPC *ipc = NULL;
  55
  56 /*
  57  * make sure only one copy of sendcommand runs at a time, using lock files
  58  */
  59 int set_lockfile(void)
  60 {
  61         FILE *lfp;
  62         int onppid;
  63         int rv;
  64
  65         if ((lfp = fopen(LOCKFILE, "r")) != NULL) {
  66                 rv = fscanf(lfp, "%d", &onppid);
  67                 fclose(lfp);
  68                 if (!kill(onppid, 0) || errno == EPERM)
  69                         return 1;
  70         }
  71         lfp = fopen(LOCKFILE, "w");
  72         fprintf(lfp, "%ld\n", (long) getpid());
  73         fclose(lfp);
  74         return (0);
  75 }
  76
  77 void remove_lockfile(void)
  78 {
  79         unlink(LOCKFILE);
  80 }
  81
  82 /*
  83  * Why both cleanup() and nq_cleanup() ?  Notice the alarm() call in
  84  * cleanup() .  If for some reason sendcommand hangs waiting for the server
  85  * to clean up, the alarm clock goes off and the program exits anyway.
  86  * The cleanup() routine makes a check to ensure it's not reentering, in
  87  * case the ipc module looped it somehow.
  88  */
  89 void nq_cleanup(int e)
  90 {
  91         if (e == SIGALRM)
  92                 fprintf(stderr, "\nWatch dog time out.\n");
  93         remove_lockfile();
  94         exit(e);
  95 }
  96
  97 /*
  98  * send binary to server
  99  */
 100 void serv_write(CtdlIPC *ipc, const char *buf, unsigned int nbytes)
 101 {
 102         unsigned int bytes_written = 0;
 103         int retval;
 104 /*
 105 #if defined(HAVE_OPENSSL)
 106         if (ipc->ssl) {
 107                 serv_write_ssl(ipc, buf, nbytes);
 108                 return;
 109         }
 110 #endif
 111 */
 112         while (bytes_written < nbytes) {
 113                 retval = write(ipc->sock, &buf[bytes_written],
 114                                nbytes - bytes_written);
 115                 if (retval < 1) {
 116                         connection_died(ipc, 0);
 117                         return;
 118                 }
 119                 bytes_written += retval;
 120         }
 121 }
 122
 123
 124 void cleanup(int e)
 125 {
 126         static int nested = 0;
 127
 128         alarm(30);
 129         signal(SIGALRM, nq_cleanup);
 130         serv_write(ipc, "\n", 1);
 131         if (nested++ < 1)
 132                 CtdlIPCQuit(ipc);
 133         nq_cleanup(e);
 134 }
 135
 136 /*
 137  * This is implemented as a function rather than as a macro because the
 138  * client-side IPC modules expect logoff() to be defined.  They call logoff()
 139  * when a problem connecting or staying connected to the server occurs.
 140  */
 141 void logoff(int e)
 142 {
 143         cleanup(e);
 144 }
 145
 146 /*
 147  * Connect sendcommand to the Citadel server running on this computer.
 148  */
 149 void np_attach_to_server(char *host, char *port)
 150 {
 151         char buf[SIZ];
 152         char hostbuf[256], portbuf[256];
 153         char *args[] =
 154         {"sendcommand", NULL};
 155         int r;
 156
 157         fprintf(stderr, "Attaching to server...\n");
 158         strcpy(hostbuf, host);
 159         strcpy(portbuf, port);
 160         ipc = CtdlIPC_new(1, args, hostbuf, portbuf);
 161         if (!ipc) {
 162                 fprintf(stderr, "Can't connect: %s\n", strerror(errno));
 163                 exit(3);
 164         }
 165         CtdlIPC_chat_recv(ipc, buf);
 166         fprintf(stderr, "%s\n", &buf[4]);
 167         snprintf(buf, sizeof buf, "IPGM %d", config.c_ipgm_secret);
 168         r = CtdlIPCInternalProgram(ipc, config.c_ipgm_secret, buf);
 169         fprintf(stderr, "%s\n", buf);
 170         if (r / 100 != 2) {
 171                 cleanup(2);
 172         }
 173 }
 174
 175
 176 void sendcommand_die(void) {
 177         exit(0);
 178 }
 179
 180
 181
 182 int main(int argc, char **argv)
 183 {
 184         int a;
 185         char cmd[SIZ];
 186         char buf[SIZ];
 187         int watchdog = 60;
 188
 189         int relh=0;
 190         int home=0;
 191         char relhome[PATH_MAX]="";
 192         char ctdldir[PATH_MAX]=CTDLDIR;
 193         fd_set read_fd;
 194         struct timeval tv;
 195         int ret;
 196         int server_shutting_down = 0;
 197
 198         strcpy(ctdl_home_directory, DEFAULT_PORT);
 199
 200         strcpy(cmd, "");
 201         /*
 202          * Change directories if specified
 203          */
 204         for (a = 1; a < argc; ++a) {
 205                 if (!strncmp(argv[a], "-h", 2)) {
 206                         relh=argv[a][2]!='/';
 207                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 208                                                                    sizeof ctdl_home_directory);
 209                         else
 210                                 safestrncpy(relhome, &argv[a][2],
 211                                                         sizeof relhome);
 212                         home=1;
 213                 } else if (!strncmp(argv[a], "-w", 2)) {
 214                         watchdog = atoi(&argv[a][2]);
 215                         if (watchdog<1)
 216                                 watchdog=1;
 217                 } else {
 218                         if (!IsEmptyStr(cmd))
 219                                 strcat(cmd, " ");
 220                         strcat(cmd, argv[a]);
 221                 }
 222         }
 223
 224         calc_dirs_n_files(relh, home, relhome, ctdldir, 0);
 225         get_config();
 226
 227         signal(SIGINT, cleanup);
 228         signal(SIGQUIT, cleanup);
 229         signal(SIGHUP, cleanup);
 230         signal(SIGTERM, cleanup);
 231
 232         fprintf(stderr, "sendcommand: started (pid=%d) "
 233                         "running in %s\n",
 234                         (int) getpid(),
 235                         ctdl_home_directory);
 236         fflush(stderr);
 237
 238         alarm(watchdog);
 239         signal(SIGALRM, nq_cleanup); /* Set up a watchdog type timer in case we hang */
 240
 241         np_attach_to_server(UDS, ctdl_home_directory);
 242         fflush(stderr);
 243         setIPCDeathHook(sendcommand_die);
 244
 245         fprintf(stderr, "%s\n", cmd);
 246         CtdlIPC_chat_send(ipc, cmd);
 247         CtdlIPC_chat_recv(ipc, buf);
 248         fprintf(stderr, "%s\n", buf);
 249
 250         tv.tv_sec = 0;
 251         tv.tv_usec = 1000;
 252
 253         if (!strncasecmp(&buf[1], "31", 2)) {
 254                 server_shutting_down = 1;
 255         }
 256
 257         if (buf[0] == '1') {
 258                 while (CtdlIPC_chat_recv(ipc, buf), strcmp(buf, "000")) {
 259                         printf("%s\n", buf);
 260                         alarm(watchdog); /* Kick the watchdog timer */
 261                 }
 262         } else if (buf[0] == '4') {
 263                 do {
 264                         if (fgets(buf, sizeof buf, stdin) == NULL)
 265                                 strcpy(buf, "000");
 266                         if (!IsEmptyStr(buf))
 267                                 if (buf[strlen(buf) - 1] == '\n')
 268                                         buf[strlen(buf) - 1] = 0;
 269                         if (!IsEmptyStr(buf))
 270                                 if (buf[strlen(buf) - 1] == '\r')
 271                                         buf[strlen(buf) - 1] = 0;
 272                         if (strcmp(buf, "000"))
 273                                 CtdlIPC_chat_send(ipc, buf);
 274
 275                         FD_ZERO(&read_fd);
 276                         FD_SET(ipc->sock, &read_fd);
 277                         ret = select(ipc->sock+1, &read_fd, NULL, NULL,  &tv);
 278                         if (ret == -1) {
 279                                 if (!(errno == EINTR || errno == EAGAIN))
 280                                         fprintf(stderr, "select() failed: %s", strerror(errno));
 281                                 return(1);
 282                         }
 283
 284                         if (ret != 0) {
 285                                 size_t n;
 286                                 char rbuf[SIZ];
 287
 288                                 rbuf[0] = '\0';
 289                                 n = read(ipc->sock, rbuf, SIZ);
 290                                 if (n>0) {
 291                                         rbuf[n]='\0';
 292                                         fprintf(stderr, "%s", rbuf);
 293                                         fflush (stdout);
 294                                 }
 295                         }
 296                         alarm(watchdog); /* Kick the watchdog timer */
 297                 } while (strcmp(buf, "000"));
 298                 CtdlIPC_chat_send(ipc, "\n");
 299                 CtdlIPC_chat_send(ipc, "000");
 300         }
 301         alarm(0);       /* Shutdown the watchdog timer */
 302         fprintf(stderr, "sendcommand: processing ended.\n");
 303
 304         /* Clean up and log off ... unless the server indicated that the command
 305          * we sent is shutting it down, in which case we want to just cut the
 306          * connection and exit.
 307          */
 308         if (server_shutting_down) {
 309                 nq_cleanup(0);
 310         }
 311         else {
 312                 cleanup(0);
 313         }
 314         return 0;
 315 }
 316
 317 /*
 318  * Stub function
 319  */
 320 void stty_ctdl(int cmd) {
 321 }
 322
 323