lib/texpect/texpect.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 "replace.h"
  35 #include "system/filesys.h"
  36 #include "system/wait.h"
  37
  38 #ifdef HAVE_PTY_H
  39 #include <pty.h>
  40 #endif
  41 #ifdef HAVE_UTIL_H
  42 #include <util.h>
  43 #endif
  44 #ifdef HAVE_BSD_LIBUTIL_H
  45 #include <bsd/libutil.h>
  46 #elif defined HAVE_LIBUTIL_H
  47 #include <libutil.h>
  48 #endif
  49
  50 #ifdef  STREAMSPTY
  51 #include <stropts.h>
  52 #endif /* STREAMPTY */
  53
  54 #include <popt.h>
  55 #include <err.h>
  56
  57 struct command {
  58         enum { CMD_EXPECT = 0, CMD_SEND, CMD_PASSWORD } type;
  59         unsigned int lineno;
  60         char *str;
  61         struct command *next;
  62 };
  63
  64 /*
  65  *
  66  */
  67
  68 static struct command *commands, **next = &commands;
  69
  70 static sig_atomic_t alarmset = 0;
  71
  72 static int opt_timeout = 10;
  73 static int opt_verbose;
  74
  75 static int master;
  76 static int slave;
  77 static char line[256] = { 0 };
  78
  79 static void caught_signal(int signo)
  80 {
  81         alarmset = signo;
  82 }
  83
  84
  85 static void open_pty(void)
  86 {
  87 #ifdef _AIX
  88         printf("implement open_pty\n");
  89         exit(77);
  90 #endif
  91 #if defined(HAVE_OPENPTY) || defined(__linux) || defined(__osf__) /* XXX */
  92         if(openpty(&master, &slave, line, 0, 0) == 0)
  93                 return;
  94 #endif /* HAVE_OPENPTY .... */
  95 #ifdef STREAMSPTY
  96         {
  97                 char *clone[] = {
  98                         "/dev/ptc",
  99                         "/dev/ptmx",
 100                         "/dev/ptm",
 101                         "/dev/ptym/clone",
 102                         NULL
 103                 };
 104                 char **q;
 105
 106                 for(q = clone; *q; q++){
 107                         master = open(*q, O_RDWR);
 108                         if(master >= 0){
 109 #ifdef HAVE_GRANTPT
 110                                 grantpt(master);
 111 #endif
 112 #ifdef HAVE_UNLOCKPT
 113                                 unlockpt(master);
 114 #endif
 115                                 strlcpy(line, ptsname(master), sizeof(line));
 116                                 slave = open(line, O_RDWR);
 117                                 if (slave < 0)
 118                                         errx(1, "failed to open slave when using %s", *q);
 119                                 ioctl(slave, I_PUSH, "ptem");
 120                                 ioctl(slave, I_PUSH, "ldterm");
 121
 122                                 return;
 123                         }
 124                 }
 125         }
 126 #endif /* STREAMSPTY */
 127
 128         /* more cases, like open /dev/ptmx, etc */
 129
 130         exit(77);
 131 }
 132
 133 /*
 134  *
 135  */
 136
 137 static char *iscmd(const char *buf, const char *s)
 138 {
 139         size_t len = strlen(s);
 140
 141         if (strncmp(buf, s, len) != 0) {
 142                 return NULL;
 143         }
 144
 145         return strdup(buf + len);
 146 }
 147
 148 /*******************************************************************
 149 A write wrapper that will deal with EINTR.
 150 ********************************************************************/
 151
 152 static ssize_t sys_write(int fd, const void *buf, size_t count)
 153 {
 154         ssize_t ret;
 155
 156         do {
 157                 ret = write(fd, buf, count);
 158 #if defined(EWOULDBLOCK)
 159         } while (ret == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
 160 #else
 161         } while (ret == -1 && (errno == EINTR || errno == EAGAIN));
 162 #endif
 163         return ret;
 164 }
 165
 166 static void parse_configuration(const char *fn)
 167 {
 168         struct command *c;
 169         char s[1024];
 170         char *str;
 171         unsigned int lineno = 0;
 172         FILE *cmd;
 173
 174         cmd = fopen(fn, "r");
 175         if (cmd == NULL)
 176                 err(1, "open: %s", fn);
 177
 178         while (fgets(s, sizeof(s),  cmd) != NULL) {
 179
 180                 s[strcspn(s, "#\n")] = '\0';
 181                 lineno++;
 182
 183                 c = calloc(1, sizeof(*c));
 184                 if (c == NULL)
 185                         errx(1, "malloc");
 186
 187                 c->lineno = lineno;
 188                 (*next) = c;
 189                 next = &(c->next);
 190
 191                 if ((str = iscmd(s, "expect ")) != NULL) {
 192                         c->type = CMD_EXPECT;
 193                         c->str = str;
 194                 } else if ((str = iscmd(s, "send ")) != NULL) {
 195                         c->type = CMD_SEND;
 196                         c->str = str;
 197                 } else if ((str = iscmd(s, "password ")) != NULL) {
 198                         c->type = CMD_PASSWORD;
 199                         c->str = str;
 200                 } else
 201                         errx(1, "Invalid command on line %d: %s", lineno, s);
 202         }
 203
 204         fclose(cmd);
 205 }
 206
 207 /* A wrapper to close als file descriptors above the given fd */
 208 static int sys_closefrom(int fd)
 209 {
 210         int num = getdtablesize();
 211
 212         if (num < 0) {
 213                 num = 1024;
 214         }
 215
 216         for (; fd <= num; fd++) {
 217                 close(fd);
 218         }
 219
 220         return 0;
 221 }
 222
 223
 224 /*
 225  *
 226  */
 227
 228 static int eval_parent(pid_t pid)
 229 {
 230         struct command *c;
 231         char in;
 232         size_t len = 0;
 233         ssize_t sret;
 234
 235         for (c = commands; c != NULL; c = c->next) {
 236                 switch(c->type) {
 237                 case CMD_EXPECT:
 238                         if (opt_verbose) {
 239                                 printf("[expecting %s]\n", c->str);
 240                         }
 241                         len = 0;
 242                         alarm(opt_timeout);
 243                         while((sret = read(master, &in, sizeof(in))) > 0) {
 244                                 alarm(opt_timeout);
 245                                 printf("%c", in);
 246                                 if (c->str[len] != in) {
 247                                         len = 0;
 248                                         continue;
 249                                 }
 250                                 len++;
 251                                 if (c->str[len] == '\0') {
 252                                         break;
 253                                 }
 254                         }
 255                         alarm(0);
 256                         if (alarmset == SIGALRM) {
 257                                 errx(1, "timeout waiting for %s (line %u)",
 258                                                 c->str, c->lineno);
 259                         } else if (alarmset) {
 260                                 errx(1, "got a signal %d waiting for %s (line %u)",
 261                                                 (int)alarmset, c->str, c->lineno);
 262                         }
 263
 264                         if (sret <= 0) {
 265                                 errx(1, "end command while waiting for %s (line %u)",
 266                                                 c->str, c->lineno);
 267                         }
 268                         break;
 269                 case CMD_SEND:
 270                 case CMD_PASSWORD: {
 271                         size_t i = 0;
 272                         const char *msg = (c->type == CMD_PASSWORD) ? "****" : c->str;
 273
 274                         if (opt_verbose) {
 275                                 printf("[send %s]\n", msg);
 276                         }
 277
 278                         len = strlen(c->str);
 279
 280                         while (i < len) {
 281                                 if (c->str[i] == '\\' && i < len - 1) {
 282                                         char ctrl;
 283                                         i++;
 284                                         switch(c->str[i]) {
 285                                         case 'n':
 286                                                 ctrl = '\n';
 287                                                 break;
 288                                         case 'r':
 289                                                 ctrl = '\r';
 290                                                 break;
 291                                         case 't':
 292                                                 ctrl = '\t';
 293                                                 break;
 294                                         default:
 295                                                 errx(1,
 296                                                      "unknown control char %c (line %u)",
 297                                                      c->str[i],
 298                                                      c->lineno);
 299                                         }
 300                                         if (sys_write(master, &ctrl, 1) != 1) {
 301                                                 errx(1, "command refused input (line %u)", c->lineno);
 302                                         }
 303                                 } else {
 304                                         if (sys_write(master, &c->str[i], 1) != 1) {
 305                                                 errx(1, "command refused input (line %u)", c->lineno);
 306                                         }
 307                                 }
 308                                 i++;
 309                         }
 310                         break;
 311                 }
 312                 default:
 313                         abort();
 314                 }
 315         }
 316
 317         while(read(master, &in, sizeof(in)) > 0) {
 318                 printf("%c", in);
 319         }
 320
 321         if (opt_verbose) {
 322                 printf("[end of program]\n");
 323         }
 324
 325         /*
 326          * Fetch status from child
 327          */
 328         {
 329                 int ret, status;
 330
 331                 ret = waitpid(pid, &status, 0);
 332                 if (ret == -1) {
 333                         err(1, "waitpid");
 334                 }
 335
 336                 if (WIFEXITED(status) && WEXITSTATUS(status)) {
 337                         return WEXITSTATUS(status);
 338                 } else if (WIFSIGNALED(status)) {
 339                         printf("killed by signal: %d\n", WTERMSIG(status));
 340                         return 1;
 341                 }
 342         }
 343
 344         return 0;
 345 }
 346
 347 /*
 348  *
 349  */
 350 struct poptOption long_options[] = {
 351         POPT_AUTOHELP
 352         {"timeout", 't', POPT_ARG_INT,  &opt_timeout, 't'},
 353         {"verbose", 'v', POPT_ARG_NONE, &opt_verbose, 'v'},
 354         POPT_TABLEEND
 355 };
 356
 357 int main(int argc, const char **argv)
 358 {
 359         int optidx = 0;
 360         pid_t pid;
 361         poptContext pc;
 362         const char *instruction_file;
 363         const char **args;
 364         const char *program;
 365         char * const *program_args;
 366
 367         pc = poptGetContext("texpect",
 368                             argc,
 369                             argv,
 370                             long_options,
 371                             POPT_CONTEXT_POSIXMEHARDER);
 372
 373         if (argc == 1) {
 374                 poptPrintHelp(pc, stderr, 0);
 375                 return 1;
 376         }
 377
 378         while ((optidx = poptGetNextOpt(pc)) != -1) {
 379                 ;;
 380         }
 381
 382         instruction_file = poptGetArg(pc);
 383         args = poptGetArgs(pc);
 384         program_args = (char * const *)discard_const_p(char *, args);
 385         program = program_args[0];
 386
 387         if (opt_verbose) {
 388                 int i;
 389
 390                 printf("Using instruction_file: %s\n", instruction_file);
 391                 printf("Executing '%s' ", program);
 392                 for (i = 0; program_args && program_args[i] != NULL; i++) {
 393                         printf("'%s' ", program_args[i]);
 394                 }
 395                 printf("\n");
 396         }
 397
 398         parse_configuration(instruction_file);
 399
 400         open_pty();
 401
 402         pid = fork();
 403         switch (pid) {
 404                 case -1:
 405                         err(1, "Failed to fork");
 406                 case 0:
 407
 408                         if(setsid()<0)
 409                                 err(1, "setsid");
 410
 411                         dup2(slave, STDIN_FILENO);
 412                         dup2(slave, STDOUT_FILENO);
 413                         dup2(slave, STDERR_FILENO);
 414
 415                         sys_closefrom(STDERR_FILENO + 1);
 416
 417                         /* texpect <expect_instructions> <progname> [<args>] */
 418                         execvp(program, program_args);
 419                         err(1, "Failed to exec: %s", program);
 420                 default:
 421                         close(slave);
 422                         {
 423                                 struct sigaction sa;
 424
 425                                 sa.sa_handler = caught_signal;
 426                                 sa.sa_flags = 0;
 427                                 sigemptyset (&sa.sa_mask);
 428
 429                                 sigaction(SIGALRM, &sa, NULL);
 430                         }
 431
 432                         return eval_parent(pid);
 433         }
 434 }