mdw@git.distorted.org.uk Git - tripe/blob - client.c

   1 /* -*-c-*-
   2  *
   3  * $Id: client.c,v 1.2 2001/02/04 01:17:54 mdw Exp $
   4  *
   5  * Client for TrIPE
   6  *
   7  * (c) 2001 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Trivial IP Encryption (TrIPE).
  13  *
  14  * TrIPE is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * TrIPE is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with TrIPE; if not, write to the Free Software Foundation,
  26  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  */
  28
  29 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: client.c,v $
  32  * Revision 1.2  2001/02/04 01:17:54  mdw
  33  * Create a configuration header file to tidy up command lines.
  34  *
  35  * Revision 1.1  2001/02/03 20:26:37  mdw
  36  * Initial checkin.
  37  *
  38  */
  39
  40 /*----- Header files ------------------------------------------------------*/
  41
  42 #include "config.h"
  43
  44 #include <ctype.h>
  45 #include <errno.h>
  46 #include <signal.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <time.h>
  51
  52 #include <sys/types.h>
  53 #include <sys/time.h>
  54 #include <unistd.h>
  55 #include <fcntl.h>
  56 #include <sys/wait.h>
  57 #include <syslog.h>
  58
  59 #include <sys/socket.h>
  60 #include <sys/un.h>
  61 #include <arpa/inet.h>
  62 #include <netdb.h>
  63
  64 #include <mLib/alloc.h>
  65 #include <mLib/darray.h>
  66 #include <mLib/dstr.h>
  67 #include <mLib/lbuf.h>
  68 #include <mLib/mdwopt.h>
  69 #include <mLib/quis.h>
  70 #include <mLib/report.h>
  71 #include <mLib/sel.h>
  72 #include <mLib/selbuf.h>
  73 #include <mLib/str.h>
  74
  75 #include "util.h"
  76
  77 #undef sun
  78
  79 /*----- Data structures ---------------------------------------------------*/
  80
  81 #ifndef STRING_V
  82 #  define STRING_V
  83    DA_DECL(string_v, char *);
  84 #endif
  85
  86 /*----- Static variables --------------------------------------------------*/
  87
  88 static FILE *logfp = 0;
  89 static unsigned f = 0;
  90 static int fd;
  91
  92 #define f_bogus 1u
  93 #define f_spawn 2u
  94 #define f_daemon 4u
  95 #define f_spawnopts 8u
  96 #define f_syslog 16u
  97 #define f_command 32u
  98 #define f_noinput 64u
  99 #define f_warn 128u
 100 #define f_uclose 256u
 101
 102 /*----- Main code ---------------------------------------------------------*/
 103
 104 static void reap(int sig)
 105 {
 106   int s;
 107   int e = errno;
 108   while (waitpid(-1, &s, WNOHANG) > 0)
 109     ;
 110   errno = e;
 111 }
 112
 113 static void writelog(const char *cat, const char *msg)
 114 {
 115   char buf[256];
 116   time_t t = time(0);
 117   struct tm *tm = localtime(&t);
 118   strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm);
 119   fprintf(logfp, "%s %s: %s\n", buf, cat, msg);
 120 }
 121
 122 static void cline(char *p, void *b)
 123 {
 124   char *q;
 125   if (!p) {
 126     if (f & f_command)
 127       die(EXIT_FAILURE, "server dropped the connection");
 128     exit(0);
 129   }
 130   q = str_getword(&p);
 131   if (!q)
 132     return;
 133   if (strcmp(q, "WARN") == 0) {
 134     if (f & f_syslog)
 135       syslog(LOG_WARNING, "%s", p);
 136     if (logfp)
 137       writelog("warning", p);
 138     if (f & f_warn)
 139       fprintf(stderr, "Warning: %s\n", p);
 140   } else if (strcmp(q, "TRACE") == 0) {
 141     if (f & f_syslog)
 142       syslog(LOG_DEBUG, "%s", p);
 143     if (logfp)
 144       writelog("debug", p);
 145   } else if (!(f & f_command)) {
 146     if (f & f_syslog)
 147       syslog(LOG_ERR, "unexpected output `%s %s'", q, p);
 148     if (logfp) {
 149       dstr d = DSTR_INIT;
 150       dstr_putf(&d, "unexpected output `%s %s'", q, p);
 151       writelog("error", d.buf);
 152       dstr_destroy(&d);
 153     }
 154   } else if (strcmp(q, "ERR") == 0)
 155     die(EXIT_FAILURE, "%s", p);
 156   else if (strcmp(q, "INFO") == 0)
 157     puts(p);
 158   else if (strcmp(q, "OK") == 0)
 159     exit(0);
 160   else
 161     die(EXIT_FAILURE, "unexpected output `%s %s'", q, p);
 162 }
 163
 164 static void sline(char *p, void *b)
 165 {
 166   if (!p) {
 167     if (!(f & f_uclose))
 168       moan("server closed the connection");
 169     exit(0);
 170   }
 171   puts(p);
 172 }
 173
 174 static void uline(char *p, void *b)
 175 {
 176   size_t sz;
 177   if (!p) {
 178     selbuf_destroy(b);
 179     shutdown(fd, 1);
 180     f |= f_uclose;
 181   } else {
 182     sz = strlen(p);
 183     p[sz] = '\n';
 184     write(fd, p, sz + 1);
 185   }
 186 }
 187
 188 static void version(FILE *fp)
 189 {
 190   pquis(fp, "$, TrIPE version " VERSION "\n");
 191 }
 192
 193 static void usage(FILE *fp)
 194 {
 195   pquis(fp, "\
 196 Usage:\n\
 197         $ [-w] [-options] [command [args]...]\n\
 198         $ [-Dl] [-f file] [-options]\n\
 199 Options:\n\
 200         [-s] [-d directory] [-a socket] [-p program] [-S arg,arg,...]\n\
 201 ");
 202 }
 203
 204 static void help(FILE *fp)
 205 {
 206   version(fp);
 207   fputc('\n', fp);
 208   usage(fp);
 209   fputs("\
 210 \n\
 211 Options in full:\n\
 212 \n\
 213 -h, --help              Show this help text.\n\
 214 -v, --version           Show version number.\n\
 215 -u, --usage             Show brief usage message.\n\
 216 \n\
 217 -D, --daemon            Become a background task after connecting.\n\
 218 -d, --directory=DIR     Select current directory [default /var/lib/tripe]\n\
 219 -a, --admin-socket=FILE Select socket to connect to.\n\
 220 \n\
 221 -s, --spawn             Start server rather than connecting.\n\
 222 -p, --spawn-path=PATH   Specify path to executable.\n\
 223 -S, --spawn-args=ARGS   Specify comma-separated arguments.\n\
 224 \n\
 225 -l, --syslog            Log messages to system log.\n\
 226 -f, --logfile=FILE      Log messages to FILE.\n\
 227 -w, --warnings          Show warnings when running commands.\n\
 228 ", fp);
 229 }
 230
 231 int main(int argc, char *argv[])
 232 {
 233   const char *dir = "/var/lib/tripe";
 234   const char *sock = "tripesock";
 235   const char *spawnpath = "tripe";
 236   string_v spawnopts = DA_INIT;
 237   char *p;
 238
 239   ego(argv[0]);
 240
 241   if ((p = getenv("TRIPEDIR")) != 0)
 242     dir = p;
 243
 244   /* --- Parse the arguments --- */
 245
 246   for (;;) {
 247     static const struct option opts[] = {
 248       { "help",         0,              0,      'h' },
 249       { "version",      0,              0,      'v' },
 250       { "usage",        0,              0,      'u' },
 251       { "daemon",       0,              0,      'D' },
 252       { "directory",    OPTF_ARGREQ,    0,      'd' },
 253       { "admin-socket", OPTF_ARGREQ,    0,      'a' },
 254       { "spawn",        0,              0,      's' },
 255       { "spawn-path",   OPTF_ARGREQ,    0,      'p' },
 256       { "spawn-args",   OPTF_ARGREQ,    0,      'S' },
 257       { "syslog",       0,              0,      'l' },
 258       { "logfile",      OPTF_ARGREQ,    0,      'f' },
 259       { "warnings",     0,              0,      'w' },
 260       { 0,              0,              0,      0 }
 261     };
 262
 263     int i = mdwopt(argc, argv, "hvuDd:a:sp:S:lwf:n", opts, 0, 0, 0);
 264     if (i < 0)
 265       break;
 266     switch (i) {
 267       case 'h':
 268         help(stdout);
 269         exit(0);
 270       case 'v':
 271         version(stdout);
 272         exit(0);
 273       case 'u':
 274         usage(stdout);
 275         exit(0);
 276       case 'D':
 277         f |= f_daemon | f_noinput;
 278         break;
 279       case 'd':
 280         dir = optarg;
 281         break;
 282       case 'a':
 283         sock = optarg;
 284         break;
 285       case 's':
 286         f |= f_spawn;
 287         break;
 288       case 'p':
 289         f |= f_spawn;
 290         spawnpath = optarg;
 291         break;
 292       case 'S':
 293         f |= f_spawn | f_spawnopts;
 294         for (p = strtok(optarg, ","); p; p = strtok(0, ","))
 295           DA_PUSH(&spawnopts, p);
 296         break;
 297       case 'l':
 298         f |= f_syslog | f_noinput;
 299         break;
 300       case 'w':
 301         f |= f_warn;
 302         break;
 303       case 'f':
 304         if (logfp)
 305           fclose(logfp);
 306         if ((logfp = fopen(optarg, "a")) == 0) {
 307           die(EXIT_FAILURE, "error opening logfile `%s': %s",
 308               optarg, strerror(errno));
 309         }
 310         f |= f_noinput;
 311         break;
 312       default:
 313         f |= f_bogus;
 314         break;
 315     }
 316   }
 317   if ((f & f_bogus) || ((f & f_noinput) && optind < argc)) {
 318     usage(stderr);
 319     exit(EXIT_FAILURE);
 320   }
 321
 322   /* --- Set the world up --- */
 323
 324   if (chdir(dir)) {
 325     die(EXIT_FAILURE, "couldn't set current directory to `%s': %s",
 326         dir, strerror(errno));
 327   }
 328
 329   /* --- Connect to the server --- */
 330
 331   if (f & f_spawn) {
 332     int pfd[2];
 333     pid_t kid;
 334     struct sigaction sa;
 335     sigset_t newmask, oldmask;
 336
 337     sa.sa_handler = reap;
 338     sigemptyset(&sa.sa_mask);
 339     sa.sa_flags = SA_NOCLDSTOP;
 340 #ifdef SA_RESTART
 341     sa.sa_flags |= SA_RESTART;
 342 #endif
 343     sigaction(SIGCHLD, &sa, 0);
 344
 345     DA_UNSHIFT(&spawnopts, (char *)spawnpath);
 346     if (!(f & f_spawnopts)) {
 347       DA_PUSH(&spawnopts, "-d.");
 348       DA_PUSH(&spawnopts, "-a");
 349       DA_PUSH(&spawnopts, (char *)sock);
 350     }
 351     DA_PUSH(&spawnopts, 0);
 352     if (socketpair(PF_UNIX, SOCK_STREAM, 0, pfd))
 353       die(EXIT_FAILURE, "error from socketpair: %s", strerror(errno));
 354     sigemptyset(&newmask);
 355     sigaddset(&newmask, SIGCHLD);
 356     sigprocmask(SIG_BLOCK, &newmask, &oldmask);
 357     if ((kid = fork()) < 0)
 358       die(EXIT_FAILURE, "fork failed: %s", strerror(errno));
 359     if (!kid) {
 360       dup2(pfd[1], STDIN_FILENO);
 361       dup2(pfd[1], STDOUT_FILENO);
 362       close(pfd[1]);
 363       close(pfd[0]);
 364       execvp(DA(&spawnopts)[0], DA(&spawnopts));
 365       die(127, "couldn't exec `%s': %s", spawnpath, strerror(errno));
 366     }
 367     sigprocmask(SIG_SETMASK, &oldmask, 0);
 368     fd = pfd[0];
 369     close(pfd[1]);
 370   } else {
 371     struct sockaddr_un sun;
 372     size_t sz = strlen(sock) + 1;
 373     if (sz > sizeof(sun.sun_path))
 374       die(EXIT_FAILURE, "socket name `%s' too long", sock);
 375     memset(&sun, 0, sizeof(sun));
 376     sun.sun_family = AF_UNIX;
 377     memcpy(sun.sun_path, sock, sz);
 378     sz += offsetof(struct sockaddr_un, sun_path);
 379     if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
 380       die(EXIT_FAILURE, "error making socket: %s", strerror(errno));
 381     if (connect(fd, (struct sockaddr *)&sun, sz)) {
 382       die(EXIT_FAILURE, "error connecting to `%s': %s",
 383           sock, strerror(errno));
 384     }
 385   }
 386
 387   if (f & f_daemon) {
 388     if (u_daemon())
 389       die(EXIT_FAILURE, "error becoming daemon: %s", strerror(errno));
 390   }
 391
 392   /* --- If we're meant to be interactive, do that --- */
 393
 394   if (!(f & f_noinput) && optind == argc) {
 395     sel_state sel;
 396     selbuf bu, bs;
 397
 398     sel_init(&sel);
 399     selbuf_init(&bu, &sel, STDIN_FILENO, uline, &bu);
 400     selbuf_init(&bs, &sel, fd, sline, &bs);
 401     for (;;) {
 402       if (sel_select(&sel))
 403         die(EXIT_FAILURE, "select failed: %s", strerror(errno));
 404     }
 405   }
 406
 407   /* --- If there's a command, submit it --- */
 408
 409   if (optind < argc) {
 410     dstr d = DSTR_INIT;
 411     dstr_puts(&d, argv[optind++]);
 412     while (optind < argc) {
 413       dstr_putc(&d, ' ');
 414       dstr_puts(&d, argv[optind++]);
 415     }
 416     dstr_putc(&d, '\n');
 417     write(fd, d.buf, d.len);
 418     shutdown(fd, 1);
 419     dstr_destroy(&d);
 420     f |= f_command;
 421   }
 422
 423   /* --- Pull everything else out of the box --- */
 424
 425   {
 426     lbuf b;
 427     lbuf_init(&b, cline, 0);
 428     if (f & f_syslog)
 429       openlog(QUIS, 0, LOG_DAEMON);
 430     for (;;) {
 431       size_t sz = lbuf_free(&b, &p);
 432       ssize_t n = read(fd, p, sz);
 433       if (n < 0)
 434         die(EXIT_FAILURE, "read failed: %s", strerror(errno));
 435       if (n == 0)
 436         break;
 437       lbuf_flush(&b, p, n);
 438     }
 439     lbuf_close(&b);
 440   }
 441
 442   return (0);
 443 }
 444
 445 /*----- That's all, folks -------------------------------------------------*/