citadel/sendcommand.c

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