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 "citadel.h"
  33 #include "tools.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 /*
 165  * main
 166  */
 167 int main(int argc, char **argv)
 168 {
 169         int a;
 170         char cmd[SIZ];
 171         char buf[SIZ];
 172
 173         int relh=0;
 174         int home=0;
 175         char relhome[PATH_MAX]="";
 176         char ctdldir[PATH_MAX]=CTDLDIR;
 177         fd_set read_fd;
 178         struct timeval tv;
 179         int ret, err;
 180
 181         CtdlInitBase64Table();
 182
 183         strcpy(ctdl_home_directory, DEFAULT_PORT);
 184
 185         strcpy(cmd, "");
 186         /*
 187          * Change directories if specified
 188          */
 189         for (a = 1; a < argc; ++a) {
 190                 if (!strncmp(argv[a], "-h", 2)) {
 191                         relh=argv[a][2]!='/';
 192                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 193                                                                    sizeof ctdl_home_directory);
 194                         else
 195                                 safestrncpy(relhome, &argv[a][2],
 196                                                         sizeof relhome);
 197                         home_specified = 1;
 198                         home=1;
 199                 } else {
 200                         if (!IsEmptyStr(cmd))
 201                                 strcat(cmd, " ");
 202                         strcat(cmd, argv[a]);
 203                 }
 204         }
 205
 206         calc_dirs_n_files(relh, home, relhome, ctdldir);
 207         get_config();
 208
 209         signal(SIGINT, cleanup);
 210         signal(SIGQUIT, cleanup);
 211         signal(SIGHUP, cleanup);
 212         signal(SIGTERM, cleanup);
 213
 214         fprintf(stderr, "sendcommand: started (pid=%d) "
 215                         "running in %s\n",
 216                         (int) getpid(),
 217                         ctdl_home_directory);
 218         fflush(stderr);
 219
 220         alarm(5);
 221         signal(SIGALRM, nq_cleanup); /* Set up a watchdog type timer in case we hang */
 222
 223         np_attach_to_server(UDS, ctdl_home_directory);
 224         fflush(stderr);
 225         setIPCDeathHook(sendcommand_die);
 226
 227         fprintf(stderr, "%s\n", cmd);
 228         CtdlIPC_chat_send(ipc, cmd);
 229         CtdlIPC_chat_recv(ipc, buf);
 230         fprintf(stderr, "%s\n", buf);
 231
 232         tv.tv_sec = 0;
 233         tv.tv_usec = 1000;
 234
 235         if (buf[0] == '1') {
 236                 while (CtdlIPC_chat_recv(ipc, buf), strcmp(buf, "000")) {
 237                         printf("%s\n", buf);
 238                         alarm(5); /* Kick the watchdog timer */
 239                 }
 240         } else if (buf[0] == '4') {
 241                 do {
 242                         if (fgets(buf, sizeof buf, stdin) == NULL)
 243                                 strcpy(buf, "000");
 244                         if (!IsEmptyStr(buf))
 245                                 if (buf[strlen(buf) - 1] == '\n')
 246                                         buf[strlen(buf) - 1] = 0;
 247                         if (!IsEmptyStr(buf))
 248                                 if (buf[strlen(buf) - 1] == '\r')
 249                                         buf[strlen(buf) - 1] = 0;
 250                         if (strcmp(buf, "000"))
 251                                 CtdlIPC_chat_send(ipc, buf);
 252
 253                         FD_ZERO(&read_fd);
 254                         FD_SET(ipc->sock, &read_fd);
 255                         ret = select(ipc->sock+1, &read_fd, NULL, NULL,  &tv);
 256                         err = errno;
 257                         if (err!=0)
 258                                 printf("select failed: %d", err);
 259
 260                         if (ret == -1) {
 261                                 if (!(errno == EINTR || errno == EAGAIN))
 262                                         printf("select failed: %d", err);
 263                                 return 1;
 264                         }
 265
 266                         if (ret != 0) {
 267                                 size_t n;
 268                                 char rbuf[SIZ];
 269
 270                                 rbuf[0] = '\0';
 271                                 n = read(ipc->sock, rbuf, SIZ);
 272                                 if (n>0) {
 273                                         rbuf[n]='\0';
 274                                         fprintf (stderr, rbuf);
 275                                         fflush (stdout);
 276                                 }
 277                         }
 278                         alarm(5); /* Kick the watchdog timer */
 279                 } while (strcmp(buf, "000"));
 280                 CtdlIPC_chat_send(ipc, "\n");
 281                 CtdlIPC_chat_send(ipc, "000");
 282         }
 283         alarm(0);       /* Shutdown the watchdog timer */
 284         fprintf(stderr, "sendcommand: processing ended.\n");
 285         if (strcasecmp(cmd, "DOWN"))
 286                 cleanup(0);
 287         else    /* If we downed the server we can't to do CtdlIPCQuit in cleanup()*/
 288                 nq_cleanup(0);
 289         return 0;
 290 }