1/* 2 * Copyright (c) 2008 Kungliga Tekniska H��gskolan 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#ifdef HAVE_LIBUTIL_H 52#include <libutil.h> 53#endif 54 55#ifdef STREAMSPTY 56#include <stropts.h> 57#endif /* STREAMPTY */ 58 59#include "roken.h" 60#include <getarg.h> 61 62struct command { 63 enum { CMD_EXPECT = 0, CMD_SEND, CMD_PASSWORD } type; 64 unsigned int lineno; 65 char *str; 66 struct command *next; 67}; 68 69/* 70 * 71 */ 72 73static struct command *commands, **next = &commands; 74 75static sig_atomic_t alarmset = 0; 76 77static int timeout = 10; 78static int verbose; 79static int help_flag; 80static int version_flag; 81 82static int master; 83static int slave; 84static char line[256] = { 0 }; 85 86static void 87caught_signal(int signo) 88{ 89 alarmset = signo; 90} 91 92 93static void 94open_pty(void) 95{ 96#if defined(HAVE_OPENPTY) || defined(__linux) || defined(__osf__) /* XXX */ 97 if(openpty(&master, &slave, line, 0, 0) == 0) 98 return; 99#endif /* HAVE_OPENPTY .... */ 100#ifdef STREAMSPTY 101 { 102 char *clone[] = { 103 "/dev/ptc", 104 "/dev/ptmx", 105 "/dev/ptm", 106 "/dev/ptym/clone", 107 NULL 108 }; 109 char **q; 110 111 for(q = clone; *q; q++){ 112 master = open(*q, O_RDWR); 113 if(master >= 0){ 114#ifdef HAVE_GRANTPT 115 grantpt(master); 116#endif 117#ifdef HAVE_UNLOCKPT 118 unlockpt(master); 119#endif 120 strlcpy(line, ptsname(master), sizeof(line)); 121 slave = open(line, O_RDWR); 122 if (slave < 0) 123 errx(1, "failed to open slave when using %s", q); 124 ioctl(slave, I_PUSH, "ptem"); 125 ioctl(slave, I_PUSH, "ldterm"); 126 127 return; 128 } 129 } 130 } 131#endif /* STREAMSPTY */ 132 133 /* more cases, like open /dev/ptmx, etc */ 134 135 exit(77); 136} 137 138/* 139 * 140 */ 141 142static char * 143iscmd(const char *buf, const char *s) 144{ 145 size_t len = strlen(s); 146 if (strncmp(buf, s, len) != 0) 147 return NULL; 148 return estrdup(buf + len); 149} 150 151static void 152parse_configuration(const char *fn) 153{ 154 struct command *c; 155 char s[1024]; 156 char *str; 157 unsigned int lineno = 0; 158 FILE *cmd; 159 160 cmd = fopen(fn, "r"); 161 if (cmd == NULL) 162 err(1, "open: %s", fn); 163 164 while (fgets(s, sizeof(s), cmd) != NULL) { 165 166 s[strcspn(s, "#\n")] = '\0'; 167 lineno++; 168 169 c = calloc(1, sizeof(*c)); 170 if (c == NULL) 171 errx(1, "malloc"); 172 173 c->lineno = lineno; 174 (*next) = c; 175 next = &(c->next); 176 177 if ((str = iscmd(s, "expect ")) != NULL) { 178 c->type = CMD_EXPECT; 179 c->str = str; 180 } else if ((str = iscmd(s, "send ")) != NULL) { 181 c->type = CMD_SEND; 182 c->str = str; 183 } else if ((str = iscmd(s, "password ")) != NULL) { 184 c->type = CMD_PASSWORD; 185 c->str = str; 186 } else 187 errx(1, "Invalid command on line %d: %s", lineno, s); 188 } 189 190 fclose(cmd); 191} 192 193 194/* 195 * 196 */ 197 198static int 199eval_parent(pid_t pid) 200{ 201 struct command *c; 202 char in; 203 size_t len = 0; 204 ssize_t sret; 205 206 for (c = commands; c != NULL; c = c->next) { 207 switch(c->type) { 208 case CMD_EXPECT: 209 if (verbose) 210 printf("[expecting %s]", c->str); 211 len = 0; 212 alarm(timeout); 213 while((sret = read(master, &in, sizeof(in))) > 0) { 214 alarm(timeout); 215 printf("%c", in); 216 if (c->str[len] != in) { 217 len = 0; 218 continue; 219 } 220 len++; 221 if (c->str[len] == '\0') 222 break; 223 } 224 alarm(0); 225 if (alarmset == SIGALRM) 226 errx(1, "timeout waiting for %s (line %u)", 227 c->str, c->lineno); 228 else if (alarmset) 229 errx(1, "got a signal %d waiting for %s (line %u)", 230 alarmset, c->str, c->lineno); 231 if (sret <= 0) 232 errx(1, "end command while waiting for %s (line %u)", 233 c->str, c->lineno); 234 break; 235 case CMD_SEND: 236 case CMD_PASSWORD: { 237 size_t i = 0; 238 const char *msg = (c->type == CMD_PASSWORD) ? "****" : c->str; 239 240 if (verbose) 241 printf("[send %s]", msg); 242 243 len = strlen(c->str); 244 245 while (i < len) { 246 if (c->str[i] == '\\' && i < len - 1) { 247 char ctrl; 248 i++; 249 switch(c->str[i]) { 250 case 'n': ctrl = '\n'; break; 251 case 'r': ctrl = '\r'; break; 252 case 't': ctrl = '\t'; break; 253 default: 254 errx(1, "unknown control char %c (line %u)", 255 c->str[i], c->lineno); 256 } 257 if (net_write(master, &ctrl, 1) != 1) 258 errx(1, "command refused input (line %u)", c->lineno); 259 } else { 260 if (net_write(master, &c->str[i], 1) != 1) 261 errx(1, "command refused input (line %u)", c->lineno); 262 } 263 i++; 264 } 265 break; 266 } 267 default: 268 abort(); 269 } 270 } 271 while(read(master, &in, sizeof(in)) > 0) 272 printf("%c", in); 273 274 if (verbose) 275 printf("[end of program]\n"); 276 277 /* 278 * Fetch status from child 279 */ 280 { 281 int ret, status; 282 283 ret = waitpid(pid, &status, 0); 284 if (ret == -1) 285 err(1, "waitpid"); 286 if (WIFEXITED(status) && WEXITSTATUS(status)) 287 return WEXITSTATUS(status); 288 else if (WIFSIGNALED(status)) { 289 printf("killed by signal: %d\n", WTERMSIG(status)); 290 return 1; 291 } 292 } 293 return 0; 294} 295 296/* 297 * 298 */ 299 300static struct getargs args[] = { 301 { "timeout", 't', arg_integer, &timeout, "timout", "seconds" }, 302 { "verbose", 'v', arg_counter, &verbose, "verbose debugging" }, 303 { "version", 0, arg_flag, &version_flag, "print version" }, 304 { "help", 0, arg_flag, &help_flag, NULL } 305}; 306 307static void 308usage(int ret) 309{ 310 arg_printusage (args, sizeof(args)/sizeof(*args), NULL, "infile command.."); 311 exit (ret); 312} 313 314int 315main(int argc, char **argv) 316{ 317 int optidx = 0; 318 pid_t pid; 319 320 setprogname(argv[0]); 321 322 if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx)) 323 usage(1); 324 325 if (help_flag) 326 usage (0); 327 328 if (version_flag) { 329 fprintf (stderr, "%s from %s-%s\n", getprogname(), PACKAGE, VERSION); 330 return 0; 331 } 332 333 argv += optidx; 334 argc -= optidx; 335 336 if (argc < 2) 337 usage(1); 338 339 parse_configuration(argv[0]); 340 341 argv += 1; 342 343 open_pty(); 344 345 pid = fork(); 346 switch (pid) { 347 case -1: 348 err(1, "Failed to fork"); 349 case 0: 350 351 if(setsid()<0) 352 err(1, "setsid"); 353 354 dup2(slave, STDIN_FILENO); 355 dup2(slave, STDOUT_FILENO); 356 dup2(slave, STDERR_FILENO); 357 closefrom(STDERR_FILENO + 1); 358 359 execvp(argv[0], argv); /* add NULL to end of array ? */ 360 err(1, "Failed to exec: %s", argv[0]); 361 default: 362 close(slave); 363 { 364 struct sigaction sa; 365 366 sa.sa_handler = caught_signal; 367 sa.sa_flags = 0; 368 sigemptyset (&sa.sa_mask); 369 370 sigaction(SIGALRM, &sa, NULL); 371 } 372 373 return eval_parent(pid); 374 } 375} 376