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
  56 #ifdef HAVE_ERR_H
  57 #include <err.h>
  58 #else
  59 const char progname[] = "unknown program";
  60
  61 static void err(int eval, const char *fmt, ...)
  62 {
  63         int err_errno = errno;
  64         va_list ap;
  65
  66         fprintf(stderr, "%s: ", progname);
  67         va_start(ap, fmt);
  68         vfprintf(stderr, fmt, ap);
  69         va_end(ap);
  70         fprintf(stderr, ": %s\n", strerror(err_errno));
  71         exit(eval);
  72 }
  73
  74 static void errx(int eval, const char *fmt, ...)
  75 {
  76         va_list ap;
  77
  78         fprintf(stderr, "%s: ", progname);
  79         va_start(ap, fmt);
  80         vfprintf(stderr, fmt, ap);
  81         va_end(ap);
  82         fprintf(stderr, "\n");
  83         exit(eval);
  84 }
  85
  86 #endif
  87
  88 struct command {
  89         enum { CMD_EXPECT = 0, CMD_SEND, CMD_PASSWORD } type;
  90         unsigned int lineno;
  91         char *str;
  92         struct command *next;
  93 };
  94
  95 /*
  96  *
  97  */
  98
  99 static struct command *commands, **next = &commands;
 100
 101 static sig_atomic_t alarmset = 0;
 102
 103 static int opt_timeout = 10;
 104 static int opt_verbose;
 105
 106 static int master;
 107 static int slave;
 108 static char line[256] = { 0 };
 109
 110 static void caught_signal(int signo)
 111 {
 112         alarmset = signo;
 113 }
 114
 115
 116 static void open_pty(void)
 117 {
 118 #ifdef _AIX
 119         printf("implement open_pty\n");
 120         exit(77);
 121 #endif
 122 #if defined(HAVE_OPENPTY) || defined(__linux) || defined(__osf__) /* XXX */
 123         if(openpty(&master, &slave, line, 0, 0) == 0)
 124                 return;
 125 #endif /* HAVE_OPENPTY .... */
 126 #ifdef STREAMSPTY
 127         {
 128                 char *clone[] = {
 129                         "/dev/ptc",
 130                         "/dev/ptmx",
 131                         "/dev/ptm",
 132                         "/dev/ptym/clone",
 133                         NULL
 134                 };
 135                 char **q;
 136
 137                 for(q = clone; *q; q++){
 138                         master = open(*q, O_RDWR);
 139                         if(master >= 0){
 140 #ifdef HAVE_GRANTPT
 141                                 grantpt(master);
 142 #endif
 143 #ifdef HAVE_UNLOCKPT
 144                                 unlockpt(master);
 145 #endif
 146                                 strlcpy(line, ptsname(master), sizeof(line));
 147                                 slave = open(line, O_RDWR);
 148                                 if (slave < 0)
 149                                         errx(1, "failed to open slave when using %s", *q);
 150                                 ioctl(slave, I_PUSH, "ptem");
 151                                 ioctl(slave, I_PUSH, "ldterm");
 152
 153                                 return;
 154                         }
 155                 }
 156         }
 157 #endif /* STREAMSPTY */
 158
 159         /* more cases, like open /dev/ptmx, etc */
 160
 161         exit(77);
 162 }
 163
 164 /*
 165  *
 166  */
 167
 168 static char *iscmd(const char *buf, const char *s)
 169 {
 170         size_t len = strlen(s);
 171
 172         if (strncmp(buf, s, len) != 0) {
 173                 return NULL;
 174         }
 175
 176         return strdup(buf + len);
 177 }
 178
 179 /*******************************************************************
 180 A write wrapper that will deal with EINTR.
 181 ********************************************************************/
 182
 183 static ssize_t sys_write(int fd, const void *buf, size_t count)
 184 {
 185         ssize_t ret;
 186
 187         do {
 188                 ret = write(fd, buf, count);
 189 #if defined(EWOULDBLOCK)
 190         } while (ret == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
 191 #else
 192         } while (ret == -1 && (errno == EINTR || errno == EAGAIN));
 193 #endif
 194         return ret;
 195 }
 196
 197 static void parse_configuration(const char *fn)
 198 {
 199         struct command *c;
 200         char s[1024];
 201         char *str;
 202         unsigned int lineno = 0;
 203         FILE *cmd;
 204
 205         cmd = fopen(fn, "r");
 206         if (cmd == NULL)
 207                 err(1, "open: %s", fn);
 208
 209         while (fgets(s, sizeof(s),  cmd) != NULL) {
 210
 211                 s[strcspn(s, "#\n")] = '\0';
 212                 lineno++;
 213
 214                 c = calloc(1, sizeof(*c));
 215                 if (c == NULL)
 216                         errx(1, "malloc");
 217
 218                 c->lineno = lineno;
 219                 (*next) = c;
 220                 next = &(c->next);
 221
 222                 if ((str = iscmd(s, "expect ")) != NULL) {
 223                         c->type = CMD_EXPECT;
 224                         c->str = str;
 225                 } else if ((str = iscmd(s, "send ")) != NULL) {
 226                         c->type = CMD_SEND;
 227                         c->str = str;
 228                 } else if ((str = iscmd(s, "password ")) != NULL) {
 229                         c->type = CMD_PASSWORD;
 230                         c->str = str;
 231                 } else
 232                         errx(1, "Invalid command on line %d: %s", lineno, s);
 233         }
 234
 235         fclose(cmd);
 236 }
 237
 238 /* A wrapper to close als file descriptors above the given fd */
 239 static int sys_closefrom(int fd)
 240 {
 241         int num = getdtablesize();
 242
 243         if (num < 0) {
 244                 num = 1024;
 245         }
 246
 247         for (; fd <= num; fd++) {
 248                 close(fd);
 249         }
 250
 251         return 0;
 252 }
 253
 254
 255 /*
 256  *
 257  */
 258
 259 static int eval_parent(pid_t pid)
 260 {
 261         struct command *c;
 262         char in;
 263         size_t len = 0;
 264         ssize_t sret;
 265
 266         for (c = commands; c != NULL; c = c->next) {
 267                 switch(c->type) {
 268                 case CMD_EXPECT:
 269                         if (opt_verbose) {
 270                                 printf("[expecting %s]\n", c->str);
 271                         }
 272                         len = 0;
 273                         alarm(opt_timeout);
 274                         while((sret = read(master, &in, sizeof(in))) > 0) {
 275                                 alarm(opt_timeout);
 276                                 printf("%c", in);
 277                                 if (c->str[len] != in) {
 278                                         len = 0;
 279                                         continue;
 280                                 }
 281                                 len++;
 282                                 if (c->str[len] == '\0') {
 283                                         break;
 284                                 }
 285                         }
 286                         alarm(0);
 287                         if (alarmset == SIGALRM) {
 288                                 errx(1, "timeout waiting for %s (line %u)",
 289                                                 c->str, c->lineno);
 290                         } else if (alarmset) {
 291                                 errx(1, "got a signal %d waiting for %s (line %u)",
 292                                                 (int)alarmset, c->str, c->lineno);
 293                         }
 294
 295                         if (sret <= 0) {
 296                                 errx(1, "end command while waiting for %s (line %u)",
 297                                                 c->str, c->lineno);
 298                         }
 299                         break;
 300                 case CMD_SEND:
 301                 case CMD_PASSWORD: {
 302                         size_t i = 0;
 303                         const char *msg = (c->type == CMD_PASSWORD) ? "****" : c->str;
 304
 305                         if (opt_verbose) {
 306                                 printf("[send %s]\n", msg);
 307                         }
 308
 309                         len = strlen(c->str);
 310
 311                         while (i < len) {
 312                                 if (c->str[i] == '\\' && i < len - 1) {
 313                                         char ctrl;
 314                                         i++;
 315                                         switch(c->str[i]) {
 316                                         case 'n':
 317                                                 ctrl = '\n';
 318                                                 break;
 319                                         case 'r':
 320                                                 ctrl = '\r';
 321                                                 break;
 322                                         case 't':
 323                                                 ctrl = '\t';
 324                                                 break;
 325                                         default:
 326                                                 errx(1,
 327                                                      "unknown control char %c (line %u)",
 328                                                      c->str[i],
 329                                                      c->lineno);
 330                                         }
 331                                         if (sys_write(master, &ctrl, 1) != 1) {
 332                                                 errx(1, "command refused input (line %u)", c->lineno);
 333                                         }
 334                                 } else {
 335                                         if (sys_write(master, &c->str[i], 1) != 1) {
 336                                                 errx(1, "command refused input (line %u)", c->lineno);
 337                                         }
 338                                 }
 339                                 i++;
 340                         }
 341                         break;
 342                 }
 343                 default:
 344                         abort();
 345                 }
 346         }
 347
 348         while(read(master, &in, sizeof(in)) > 0) {
 349                 printf("%c", in);
 350         }
 351
 352         if (opt_verbose) {
 353                 printf("[end of program]\n");
 354         }
 355
 356         /*
 357          * Fetch status from child
 358          */
 359         {
 360                 int ret, status;
 361
 362                 ret = waitpid(pid, &status, 0);
 363                 if (ret == -1) {
 364                         err(1, "waitpid");
 365                 }
 366
 367                 if (WIFEXITED(status) && WEXITSTATUS(status)) {
 368                         return WEXITSTATUS(status);
 369                 } else if (WIFSIGNALED(status)) {
 370                         printf("killed by signal: %d\n", WTERMSIG(status));
 371                         return 1;
 372                 }
 373         }
 374
 375         return 0;
 376 }
 377
 378 /*
 379  *
 380  */
 381 struct poptOption long_options[] = {
 382         POPT_AUTOHELP
 383         {"timeout", 't', POPT_ARG_INT,  &opt_timeout, 't'},
 384         {"verbose", 'v', POPT_ARG_NONE, &opt_verbose, 'v'},
 385         POPT_TABLEEND
 386 };
 387
 388 int main(int argc, const char **argv)
 389 {
 390         int optidx = 0;
 391         pid_t pid;
 392         poptContext pc;
 393         const char *instruction_file;
 394         const char **args;
 395         const char *program;
 396         char * const *program_args;
 397
 398         pc = poptGetContext("texpect",
 399                             argc,
 400                             argv,
 401                             long_options,
 402                             POPT_CONTEXT_POSIXMEHARDER);
 403
 404         if (argc == 1) {
 405                 poptPrintHelp(pc, stderr, 0);
 406                 return 1;
 407         }
 408
 409         while ((optidx = poptGetNextOpt(pc)) != -1) {
 410                 ;;
 411         }
 412
 413         instruction_file = poptGetArg(pc);
 414         args = poptGetArgs(pc);
 415         program_args = (char * const *)discard_const_p(char *, args);
 416         program = program_args[0];
 417
 418         if (opt_verbose) {
 419                 int i;
 420
 421                 printf("Using instruction_file: %s\n", instruction_file);
 422                 printf("Executing '%s' ", program);
 423                 for (i = 0; program_args && program_args[i] != NULL; i++) {
 424                         printf("'%s' ", program_args[i]);
 425                 }
 426                 printf("\n");
 427         }
 428
 429         parse_configuration(instruction_file);
 430
 431         open_pty();
 432
 433         pid = fork();
 434         switch (pid) {
 435                 case -1:
 436                         err(1, "Failed to fork");
 437                 case 0:
 438
 439                         if(setsid()<0)
 440                                 err(1, "setsid");
 441
 442                         dup2(slave, STDIN_FILENO);
 443                         dup2(slave, STDOUT_FILENO);
 444                         dup2(slave, STDERR_FILENO);
 445
 446                         sys_closefrom(STDERR_FILENO + 1);
 447
 448                         /* texpect <expect_instructions> <progname> [<args>] */
 449                         execvp(program, program_args);
 450                         err(1, "Failed to exec: %s", program);
 451                 default:
 452                         close(slave);
 453                         {
 454                                 struct sigaction sa;
 455
 456                                 sa.sa_handler = caught_signal;
 457                                 sa.sa_flags = 0;
 458                                 sigemptyset (&sa.sa_mask);
 459
 460                                 sigaction(SIGALRM, &sa, NULL);
 461                         }
 462
 463                         return eval_parent(pid);
 464         }
 465 }