lib/roken/rkpty.c

   1 /*
   2  * Copyright (c) 2008 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "config.h"
  35
  36 #ifndef HAVE_SYS_TYPES_H
  37 #include <sys/types.h>
  38 #endif
  39 #ifdef HAVE_SYS_WAIT_H
  40 #include <sys/wait.h>
  41 #endif
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <unistd.h>
  45 #ifdef HAVE_PTY_H
  46 #include <pty.h>
  47 #endif
  48 #ifdef HAVE_UTIL_H
  49 #include <util.h>
  50 #endif
  51
  52 #include "roken.h"
  53 #include <getarg.h>
  54
  55 struct command {
  56     enum { CMD_EXPECT = 0, CMD_SEND, CMD_PASSWORD } type;
  57     unsigned int lineno;
  58     char *str;
  59     struct command *next;
  60 };
  61
  62 /*
  63  *
  64  */
  65
  66 static struct command *commands, **next = &commands;
  67
  68 static sig_atomic_t alarmset = 0;
  69
  70 static int verbose;
  71 static int timeout = 10;
  72 static int master;
  73 static int slave;
  74 static char line[256] = { 0 };
  75
  76 static void
  77 caught_signal(int signo)
  78 {
  79     alarmset = signo;
  80 }
  81
  82
  83 static void
  84 open_pty(void)
  85 {
  86 #if defined(HAVE_OPENPTY) || defined(__linux) || defined(__osf__) /* XXX */
  87     if(openpty(&master, &slave, line, 0, 0) == 0)
  88         return;
  89 #endif /* HAVE_OPENPTY .... */
  90     /* more cases, like open /dev/ptmx, etc */
  91
  92     exit(77);
  93 }
  94
  95 /*
  96  *
  97  */
  98
  99 static char *
 100 iscmd(const char *buf, const char *s)
 101 {
 102     size_t len = strlen(s);
 103     if (strncmp(buf, s, len) != 0)
 104         return NULL;
 105     return estrdup(buf + len);
 106 }
 107
 108 static void
 109 parse_configuration(const char *fn)
 110 {
 111     struct command *c;
 112     char s[1024];
 113     char *str;
 114     unsigned int lineno = 0;
 115     FILE *cmd;
 116
 117     cmd = fopen(fn, "r");
 118     if (cmd == NULL)
 119         err(1, "open: %s", fn);
 120
 121     while (fgets(s, sizeof(s),  cmd) != NULL) {
 122
 123         s[strcspn(s, "#\n")] = '\0';
 124         lineno++;
 125
 126         c = calloc(1, sizeof(*c));
 127         if (c == NULL)
 128             errx(1, "malloc");
 129
 130         c->lineno = lineno;
 131         (*next) = c;
 132         next = &(c->next);
 133
 134         if ((str = iscmd(s, "expect ")) != NULL) {
 135             c->type = CMD_EXPECT;
 136             c->str = str;
 137         } else if ((str = iscmd(s, "send ")) != NULL) {
 138             c->type = CMD_SEND;
 139             c->str = str;
 140         } else if ((str = iscmd(s, "password ")) != NULL) {
 141             c->type = CMD_PASSWORD;
 142             c->str = str;
 143         } else
 144             errx(1, "Invalid command on line %d: %s", lineno, s);
 145     }
 146
 147     fclose(cmd);
 148 }
 149
 150
 151 /*
 152  *
 153  */
 154
 155 static int
 156 eval_parent(pid_t pid)
 157 {
 158     struct command *c;
 159     char in;
 160     size_t len = 0;
 161     ssize_t sret;
 162
 163     for (c = commands; c != NULL; c = c->next) {
 164         switch(c->type) {
 165         case CMD_EXPECT:
 166             if (verbose)
 167                 printf("[expecting %s]", c->str);
 168             len = 0;
 169             alarm(timeout);
 170             while((sret = read(master, &in, sizeof(in))) > 0) {
 171                 alarm(timeout);
 172                 if (verbose > 1)
 173                     printf("%c", in);
 174                 if (c->str[len] != in) {
 175                     len = 0;
 176                     continue;
 177                 }
 178                 len++;
 179                 if (c->str[len] == '\0')
 180                     break;
 181             }
 182             alarm(0);
 183             if (alarmset == SIGALRM)
 184                 errx(1, "timeout waiting for %s (line %u)",
 185                      c->str, c->lineno);
 186             else if (alarmset)
 187                 errx(1, "got a signal %d waiting for %s (line %u)",
 188                      alarmset, c->str, c->lineno);
 189             if (sret <= 0)
 190                 errx(1, "end command while waiting for %s (line %u)",
 191                      c->str, c->lineno);
 192             break;
 193         case CMD_SEND:
 194         case CMD_PASSWORD: {
 195             size_t i = 0;
 196             const char *msg = (c->type == CMD_PASSWORD) ? "****" : c->str;
 197
 198             if (verbose)
 199                 printf("[send %s]", msg);
 200
 201             len = strlen(c->str);
 202
 203             while (i < len) {
 204                 if (c->str[i] == '\\' && i < len - 1) {
 205                     char ctrl;
 206                     i++;
 207                     switch(c->str[i]) {
 208                     case 'n': ctrl = '\n'; break;
 209                     case 'r': ctrl = '\r'; break;
 210                     case 't': ctrl = '\t'; break;
 211                     default:
 212                         errx(1, "unknown control char %c (line %u)",
 213                              c->str[i], c->lineno);
 214                     }
 215                     if (net_write(master, &ctrl, 1) != 1)
 216                         errx(1, "command refused input (line %u)", c->lineno);
 217                 } else {
 218                     if (net_write(master, &c->str[i], 1) != 1)
 219                         errx(1, "command refused input (line %u)", c->lineno);
 220                 }
 221                 i++;
 222             }
 223             break;
 224         }
 225         default:
 226             abort();
 227         }
 228     }
 229     while(read(master, &in, sizeof(in)) > 0)
 230         if (verbose > 1)
 231             printf("%c", in);
 232
 233     if (verbose)
 234         printf("[end of program]\n");
 235
 236     /*
 237      * Fetch status from child
 238      */
 239     {
 240         int ret, status;
 241
 242         ret = waitpid(pid, &status, 0);
 243         if (ret == -1)
 244             err(1, "waitpid");
 245         if (WIFEXITED(status) && WEXITSTATUS(status))
 246             return WEXITSTATUS(status);
 247         else if (WIFSIGNALED(status)) {
 248             printf("killed by signal: %d\n", WTERMSIG(status));
 249             return 1;
 250         }
 251     }
 252     return 0;
 253 }
 254
 255 /*
 256  *
 257  */
 258
 259 static struct getargs args[] = {
 260     { "timeout",        't', arg_integer, &timeout, "timout", "seconds" },
 261     { "verbose",        'v', arg_counter, &verbose, "verbose debugging" }
 262 };
 263
 264 static void
 265 usage(int ret)
 266 {
 267     arg_printusage (args, sizeof(args)/sizeof(*args), NULL, "infile command..");
 268     exit (ret);
 269 }
 270
 271 int
 272 main(int argc, char **argv)
 273 {
 274     int optidx = 0;
 275     pid_t pid;
 276
 277     setprogname(argv[0]);
 278
 279     if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
 280         usage(1);
 281
 282     argv += optidx;
 283     argc -= optidx;
 284
 285     if (argc < 2)
 286         usage(1);
 287
 288     parse_configuration(argv[0]);
 289
 290     argv += 1;
 291     argc -= 1;
 292
 293     open_pty();
 294
 295     pid = fork();
 296     switch (pid) {
 297     case -1:
 298         err(1, "Failed to fork");
 299     case 0:
 300
 301         if(setsid()<0)
 302             err(1, "setsid");
 303
 304         dup2(slave, STDIN_FILENO);
 305         dup2(slave, STDOUT_FILENO);
 306         dup2(slave, STDERR_FILENO);
 307         closefrom(STDERR_FILENO + 1);
 308
 309         execvp(argv[0], argv); /* add NULL to end of array ? */
 310         err(1, "Failed to exec: %s", argv[0]);
 311     default:
 312         close(slave);
 313         {
 314             struct sigaction sa;
 315
 316             sa.sa_handler = caught_signal;
 317             sa.sa_flags = 0;
 318             sigemptyset (&sa.sa_mask);
 319
 320             sigaction(SIGALRM, &sa, NULL);
 321         }
 322
 323         return eval_parent(pid);
 324     }
 325 }