citadel/utils/sendcommand.c

   1 /*
   2  * $Id$
   3  *
   4  * Command-line utility to transmit a server command.
   5  *
   6  * Copyright (c) 1987-2010 by the citadel.org team
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include "ctdl_module.h"
  24
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27 #include <sys/types.h>
  28 #include <sys/wait.h>
  29 #include <string.h>
  30 #include <fcntl.h>
  31 #include <stdio.h>
  32 #include <ctype.h>
  33
  34 #if TIME_WITH_SYS_TIME
  35 # include <sys/time.h>
  36 # include <time.h>
  37 #else
  38 # if HAVE_SYS_TIME_H
  39 #  include <sys/time.h>
  40 # else
  41 #  include <time.h>
  42 # endif
  43 #endif
  44
  45 #include <signal.h>
  46 #include <errno.h>
  47 #include <limits.h>
  48 #include <libcitadel.h>
  49 #include "citadel.h"
  50 #include "citadel_ipc.h"
  51 #include "server.h"
  52 #include "config.h"
  53
  54 #define LOCKFILE "/tmp/LCK.sendcommand"
  55
  56 static CtdlIPC *ipc = NULL;
  57
  58 /*
  59  * make sure only one copy of sendcommand runs at a time, using lock files
  60  */
  61 int set_lockfile(void)
  62 {
  63         FILE *lfp;
  64         int onppid;
  65         int rv;
  66
  67         if ((lfp = fopen(LOCKFILE, "r")) != NULL) {
  68                 rv = fscanf(lfp, "%d", &onppid);
  69                 fclose(lfp);
  70                 if (!kill(onppid, 0) || errno == EPERM)
  71                         return 1;
  72         }
  73         lfp = fopen(LOCKFILE, "w");
  74         fprintf(lfp, "%ld\n", (long) getpid());
  75         fclose(lfp);
  76         return (0);
  77 }
  78
  79 void remove_lockfile(void)
  80 {
  81         unlink(LOCKFILE);
  82 }
  83
  84 /*
  85  * Why both cleanup() and nq_cleanup() ?  Notice the alarm() call in
  86  * cleanup() .  If for some reason sendcommand hangs waiting for the server
  87  * to clean up, the alarm clock goes off and the program exits anyway.
  88  * The cleanup() routine makes a check to ensure it's not reentering, in
  89  * case the ipc module looped it somehow.
  90  */
  91 void nq_cleanup(int e)
  92 {
  93         if (e == SIGALRM)
  94                 fprintf(stderr, "\nWatch dog time out.\n");
  95         remove_lockfile();
  96         exit(e);
  97 }
  98
  99 /*
 100  * send binary to server
 101  */
 102 void serv_write(CtdlIPC *ipc, const char *buf, unsigned int nbytes)
 103 {
 104         unsigned int bytes_written = 0;
 105         int retval;
 106 /*
 107 #if defined(HAVE_OPENSSL)
 108         if (ipc->ssl) {
 109                 serv_write_ssl(ipc, buf, nbytes);
 110                 return;
 111         }
 112 #endif
 113 */
 114         while (bytes_written < nbytes) {
 115                 retval = write(ipc->sock, &buf[bytes_written],
 116                                nbytes - bytes_written);
 117                 if (retval < 1) {
 118                         connection_died(ipc, 0);
 119                         return;
 120                 }
 121                 bytes_written += retval;
 122         }
 123 }
 124
 125
 126 void cleanup(int e)
 127 {
 128         static int nested = 0;
 129
 130         alarm(30);
 131         signal(SIGALRM, nq_cleanup);
 132         serv_write(ipc, "\n", 1);
 133         if (nested++ < 1)
 134                 CtdlIPCQuit(ipc);
 135         nq_cleanup(e);
 136 }
 137
 138 /*
 139  * This is implemented as a function rather than as a macro because the
 140  * client-side IPC modules expect logoff() to be defined.  They call logoff()
 141  * when a problem connecting or staying connected to the server occurs.
 142  */
 143 void logoff(int e)
 144 {
 145         cleanup(e);
 146 }
 147
 148 /*
 149  * Connect sendcommand to the Citadel server running on this computer.
 150  */
 151 void np_attach_to_server(char *host, char *port)
 152 {
 153         char buf[SIZ];
 154         char hostbuf[256], portbuf[256];
 155         char *args[] =
 156         {"sendcommand", NULL};
 157         int r;
 158
 159         fprintf(stderr, "Attaching to server...\n");
 160         strcpy(hostbuf, host);
 161         strcpy(portbuf, port);
 162         ipc = CtdlIPC_new(1, args, hostbuf, portbuf);
 163         if (!ipc) {
 164                 fprintf(stderr, "Can't connect: %s\n", strerror(errno));
 165                 exit(3);
 166         }
 167         CtdlIPC_chat_recv(ipc, buf);
 168         fprintf(stderr, "%s\n", &buf[4]);
 169         snprintf(buf, sizeof buf, "IPGM %d", config.c_ipgm_secret);
 170         r = CtdlIPCInternalProgram(ipc, config.c_ipgm_secret, buf);
 171         fprintf(stderr, "%s\n", buf);
 172         if (r / 100 != 2) {
 173                 cleanup(2);
 174         }
 175 }
 176
 177
 178 void sendcommand_die(void) {
 179         exit(0);
 180 }
 181
 182
 183
 184 int main(int argc, char **argv)
 185 {
 186         int a;
 187         char cmd[SIZ];
 188         char buf[SIZ];
 189         int watchdog = 60;
 190
 191         int relh=0;
 192         int home=0;
 193         char relhome[PATH_MAX]="";
 194         char ctdldir[PATH_MAX]=CTDLDIR;
 195         fd_set read_fd;
 196         struct timeval tv;
 197         int ret;
 198         int server_shutting_down = 0;
 199
 200         strcpy(ctdl_home_directory, DEFAULT_PORT);
 201
 202         strcpy(cmd, "");
 203         /*
 204          * Change directories if specified
 205          */
 206         for (a = 1; a < argc; ++a) {
 207                 if (!strncmp(argv[a], "-h", 2)) {
 208                         relh=argv[a][2]!='/';
 209                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 210                                                                    sizeof ctdl_home_directory);
 211                         else
 212                                 safestrncpy(relhome, &argv[a][2],
 213                                                         sizeof relhome);
 214                         home=1;
 215                 } else if (!strncmp(argv[a], "-w", 2)) {
 216                         watchdog = atoi(&argv[a][2]);
 217                         if (watchdog<1)
 218                                 watchdog=1;
 219                 } else {
 220                         if (!IsEmptyStr(cmd))
 221                                 strcat(cmd, " ");
 222                         strcat(cmd, argv[a]);
 223                 }
 224         }
 225
 226         calc_dirs_n_files(relh, home, relhome, ctdldir, 0);
 227         get_config();
 228
 229         signal(SIGINT, cleanup);
 230         signal(SIGQUIT, cleanup);
 231         signal(SIGHUP, cleanup);
 232         signal(SIGTERM, cleanup);
 233
 234         fprintf(stderr, "sendcommand: started (pid=%d) "
 235                         "running in %s\n",
 236                         (int) getpid(),
 237                         ctdl_home_directory);
 238         fflush(stderr);
 239
 240         alarm(watchdog);
 241         signal(SIGALRM, nq_cleanup); /* Set up a watchdog type timer in case we hang */
 242
 243         np_attach_to_server(UDS, ctdl_home_directory);
 244         fflush(stderr);
 245         setIPCDeathHook(sendcommand_die);
 246
 247         fprintf(stderr, "%s\n", cmd);
 248         CtdlIPC_chat_send(ipc, cmd);
 249         CtdlIPC_chat_recv(ipc, buf);
 250         fprintf(stderr, "%s\n", buf);
 251
 252         tv.tv_sec = 0;
 253         tv.tv_usec = 1000;
 254
 255         if (!strncasecmp(&buf[1], "31", 2)) {
 256                 server_shutting_down = 1;
 257         }
 258
 259         if (buf[0] == '1') {
 260                 while (CtdlIPC_chat_recv(ipc, buf), strcmp(buf, "000")) {
 261                         printf("%s\n", buf);
 262                         alarm(watchdog); /* Kick the watchdog timer */
 263                 }
 264         } else if (buf[0] == '4') {
 265                 do {
 266                         if (fgets(buf, sizeof buf, stdin) == NULL)
 267                                 strcpy(buf, "000");
 268                         if (!IsEmptyStr(buf))
 269                                 if (buf[strlen(buf) - 1] == '\n')
 270                                         buf[strlen(buf) - 1] = 0;
 271                         if (!IsEmptyStr(buf))
 272                                 if (buf[strlen(buf) - 1] == '\r')
 273                                         buf[strlen(buf) - 1] = 0;
 274                         if (strcmp(buf, "000"))
 275                                 CtdlIPC_chat_send(ipc, buf);
 276
 277                         FD_ZERO(&read_fd);
 278                         FD_SET(ipc->sock, &read_fd);
 279                         ret = select(ipc->sock+1, &read_fd, NULL, NULL,  &tv);
 280                         if (ret == -1) {
 281                                 if (!(errno == EINTR || errno == EAGAIN))
 282                                         fprintf(stderr, "select() failed: %s", strerror(errno));
 283                                 return(1);
 284                         }
 285
 286                         if (ret != 0) {
 287                                 size_t n;
 288                                 char rbuf[SIZ];
 289
 290                                 rbuf[0] = '\0';
 291                                 n = read(ipc->sock, rbuf, SIZ);
 292                                 if (n>0) {
 293                                         rbuf[n]='\0';
 294                                         fprintf(stderr, rbuf);
 295                                         fflush (stdout);
 296                                 }
 297                         }
 298                         alarm(watchdog); /* Kick the watchdog timer */
 299                 } while (strcmp(buf, "000"));
 300                 CtdlIPC_chat_send(ipc, "\n");
 301                 CtdlIPC_chat_send(ipc, "000");
 302         }
 303         alarm(0);       /* Shutdown the watchdog timer */
 304         fprintf(stderr, "sendcommand: processing ended.\n");
 305
 306         /* Clean up and log off ... unless the server indicated that the command
 307          * we sent is shutting it down, in which case we want to just cut the
 308          * connection and exit.
 309          */
 310         if (server_shutting_down) {
 311                 nq_cleanup(0);
 312         }
 313         else {
 314                 cleanup(0);
 315         }
 316         return 0;
 317 }
 318
 319 /*
 320  * Stub function
 321  */
 322 void stty_ctdl(int cmd) {
 323 }
 324
 325