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         if (e == SIGALRM)
  77                 fprintf(stderr, "\nWatch dog time out.\n");
  78         remove_lockfile();
  79         exit(e);
  80 }
  81
  82 /*
  83  * send binary to server
  84  */
  85 void serv_write(CtdlIPC *ipc, const char *buf, unsigned int nbytes)
  86 {
  87         unsigned int bytes_written = 0;
  88         int retval;
  89 /*
  90 #if defined(HAVE_OPENSSL)
  91         if (ipc->ssl) {
  92                 serv_write_ssl(ipc, buf, nbytes);
  93                 return;
  94         }
  95 #endif
  96 */
  97         while (bytes_written < nbytes) {
  98                 retval = write(ipc->sock, &buf[bytes_written],
  99                                nbytes - bytes_written);
 100                 if (retval < 1) {
 101                         connection_died(ipc, 0);
 102                         return;
 103                 }
 104                 bytes_written += retval;
 105         }
 106 }
 107
 108
 109 void cleanup(int e)
 110 {
 111         static int nested = 0;
 112
 113         alarm(30);
 114         signal(SIGALRM, nq_cleanup);
 115         serv_write(ipc, "\n", 1);
 116         if (nested++ < 1)
 117                 CtdlIPCQuit(ipc);
 118         nq_cleanup(e);
 119 }
 120
 121 /*
 122  * This is implemented as a function rather than as a macro because the
 123  * client-side IPC modules expect logoff() to be defined.  They call logoff()
 124  * when a problem connecting or staying connected to the server occurs.
 125  */
 126 void logoff(int e)
 127 {
 128         cleanup(e);
 129 }
 130
 131 /*
 132  * Connect sendcommand to the Citadel server running on this computer.
 133  */
 134 void np_attach_to_server(char *host, char *port)
 135 {
 136         char buf[SIZ];
 137         char hostbuf[256], portbuf[256];
 138         char *args[] =
 139         {"sendcommand", NULL};
 140         int r;
 141
 142         fprintf(stderr, "Attaching to server...\n");
 143         strcpy(hostbuf, host);
 144         strcpy(portbuf, port);
 145         ipc = CtdlIPC_new(1, args, hostbuf, portbuf);
 146         if (!ipc) {
 147                 fprintf(stderr, "Can't connect: %s\n", strerror(errno));
 148                 exit(3);
 149         }
 150         CtdlIPC_chat_recv(ipc, buf);
 151         fprintf(stderr, "%s\n", &buf[4]);
 152         snprintf(buf, sizeof buf, "IPGM %d", config.c_ipgm_secret);
 153         r = CtdlIPCInternalProgram(ipc, config.c_ipgm_secret, buf);
 154         fprintf(stderr, "%s\n", buf);
 155         if (r / 100 != 2) {
 156                 cleanup(2);
 157         }
 158 }
 159
 160
 161 void sendcommand_die(void) {
 162         exit(0);
 163 }
 164
 165
 166
 167 /*
 168  * main
 169  */
 170 int main(int argc, char **argv)
 171 {
 172         int a;
 173         char cmd[SIZ];
 174         char buf[SIZ];
 175         int watchdog = 5;
 176
 177         int relh=0;
 178         int home=0;
 179         char relhome[PATH_MAX]="";
 180         char ctdldir[PATH_MAX]=CTDLDIR;
 181         fd_set read_fd;
 182         struct timeval tv;
 183         int ret, err;
 184         int server_shutting_down = 0;
 185
 186         strcpy(ctdl_home_directory, DEFAULT_PORT);
 187
 188         strcpy(cmd, "");
 189         /*
 190          * Change directories if specified
 191          */
 192         for (a = 1; a < argc; ++a) {
 193                 if (!strncmp(argv[a], "-h", 2)) {
 194                         relh=argv[a][2]!='/';
 195                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 196                                                                    sizeof ctdl_home_directory);
 197                         else
 198                                 safestrncpy(relhome, &argv[a][2],
 199                                                         sizeof relhome);
 200                         home_specified = 1;
 201                         home=1;
 202                 } else if (!strncmp(argv[a], "-w", 2)) {
 203                         watchdog = atoi(&argv[a][2]);
 204                         if (watchdog<1)
 205                                 watchdog=1;
 206                 } else {
 207                         if (!IsEmptyStr(cmd))
 208                                 strcat(cmd, " ");
 209                         strcat(cmd, argv[a]);
 210                 }
 211         }
 212
 213         calc_dirs_n_files(relh, home, relhome, ctdldir, 0);
 214         get_config();
 215
 216         signal(SIGINT, cleanup);
 217         signal(SIGQUIT, cleanup);
 218         signal(SIGHUP, cleanup);
 219         signal(SIGTERM, cleanup);
 220
 221         fprintf(stderr, "sendcommand: started (pid=%d) "
 222                         "running in %s\n",
 223                         (int) getpid(),
 224                         ctdl_home_directory);
 225         fflush(stderr);
 226
 227         alarm(watchdog);
 228         signal(SIGALRM, nq_cleanup); /* Set up a watchdog type timer in case we hang */
 229
 230         np_attach_to_server(UDS, ctdl_home_directory);
 231         fflush(stderr);
 232         setIPCDeathHook(sendcommand_die);
 233
 234         fprintf(stderr, "%s\n", cmd);
 235         CtdlIPC_chat_send(ipc, cmd);
 236         CtdlIPC_chat_recv(ipc, buf);
 237         fprintf(stderr, "%s\n", buf);
 238
 239         tv.tv_sec = 0;
 240         tv.tv_usec = 1000;
 241
 242         if (!strncasecmp(&buf[1], "31", 2)) {
 243                 server_shutting_down = 1;
 244         }
 245
 246         if (buf[0] == '1') {
 247                 while (CtdlIPC_chat_recv(ipc, buf), strcmp(buf, "000")) {
 248                         printf("%s\n", buf);
 249                         alarm(watchdog); /* Kick the watchdog timer */
 250                 }
 251         } else if (buf[0] == '4') {
 252                 do {
 253                         if (fgets(buf, sizeof buf, stdin) == NULL)
 254                                 strcpy(buf, "000");
 255                         if (!IsEmptyStr(buf))
 256                                 if (buf[strlen(buf) - 1] == '\n')
 257                                         buf[strlen(buf) - 1] = 0;
 258                         if (!IsEmptyStr(buf))
 259                                 if (buf[strlen(buf) - 1] == '\r')
 260                                         buf[strlen(buf) - 1] = 0;
 261                         if (strcmp(buf, "000"))
 262                                 CtdlIPC_chat_send(ipc, buf);
 263
 264                         FD_ZERO(&read_fd);
 265                         FD_SET(ipc->sock, &read_fd);
 266                         ret = select(ipc->sock+1, &read_fd, NULL, NULL,  &tv);
 267                         err = errno;
 268                         if (err!=0)
 269                                 printf("select failed: %d", err);
 270
 271                         if (ret == -1) {
 272                                 if (!(errno == EINTR || errno == EAGAIN))
 273                                         printf("select failed: %d", err);
 274                                 return 1;
 275                         }
 276
 277                         if (ret != 0) {
 278                                 size_t n;
 279                                 char rbuf[SIZ];
 280
 281                                 rbuf[0] = '\0';
 282                                 n = read(ipc->sock, rbuf, SIZ);
 283                                 if (n>0) {
 284                                         rbuf[n]='\0';
 285                                         fprintf (stderr, rbuf);
 286                                         fflush (stdout);
 287                                 }
 288                         }
 289                         alarm(watchdog); /* Kick the watchdog timer */
 290                 } while (strcmp(buf, "000"));
 291                 CtdlIPC_chat_send(ipc, "\n");
 292                 CtdlIPC_chat_send(ipc, "000");
 293         }
 294         alarm(0);       /* Shutdown the watchdog timer */
 295         fprintf(stderr, "sendcommand: processing ended.\n");
 296
 297         /* Clean up and log off ... unless the server indicated that the command
 298          * we sent is shutting it down, in which case we want to just cut the
 299          * connection and exit.
 300          */
 301         if (server_shutting_down) {
 302                 nq_cleanup(0);
 303         }
 304         else {
 305                 cleanup(0);
 306         }
 307         return 0;
 308 }