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 #ifdef HAVE_UNISTD_H 45 #include <unistd.h> 46 #endif 47 #ifdef HAVE_PTY_H 48 #include <pty.h> 49 #endif 50 #ifdef HAVE_UTIL_H 51 #include <util.h> 52 #endif 53 #ifdef HAVE_LIBUTIL_H 54 #include <libutil.h> 55 #endif 56 57 #ifdef STREAMSPTY 58 #include <stropts.h> 59 #endif /* STREAMPTY */ 60 61 #include "roken.h" 62 #include <getarg.h> 63 64 struct command { 65 enum { CMD_EXPECT = 0, CMD_SEND, CMD_PASSWORD } type; 66 unsigned int lineno; 67 char *str; 68 struct command *next; 69 }; 70 71 /* 72 * 73 */ 74 75 static struct command *commands, **next = &commands; 76 77 static sig_atomic_t alarmset = 0; 78 79 static int timeout = 10; 80 static int verbose; 81 static int help_flag; 82 static int version_flag; 83 84 static int master; 85 static int slave; 86 static char line[256] = { 0 }; 87 88 static void 89 caught_signal(int signo) 90 { 91 alarmset = signo; 92 } 93 94 95 static void 96 open_pty(void) 97 { 98 #ifdef _AIX 99 printf("implement open_pty\n"); 100 exit(77); 101 #endif 102 #if defined(HAVE_OPENPTY) || defined(__linux) || defined(__osf__) /* XXX */ 103 if(openpty(&master, &slave, line, 0, 0) == 0) 104 return; 105 #endif /* HAVE_OPENPTY .... */ 106 #ifdef STREAMSPTY 107 { 108 char *clone[] = { 109 "/dev/ptc", 110 "/dev/ptmx", 111 "/dev/ptm", 112 "/dev/ptym/clone", 113 NULL 114 }; 115 char **q; 116 117 for(q = clone; *q; q++){ 118 master = open(*q, O_RDWR); 119 if(master >= 0){ 120 #ifdef HAVE_GRANTPT 121 grantpt(master); 122 #endif 123 #ifdef HAVE_UNLOCKPT 124 unlockpt(master); 125 #endif 126 strlcpy(line, ptsname(master), sizeof(line)); 127 slave = open(line, O_RDWR); 128 if (slave < 0) 129 errx(1, "failed to open slave when using %s", *q); 130 ioctl(slave, I_PUSH, "ptem"); 131 ioctl(slave, I_PUSH, "ldterm"); 132 133 return; 134 } 135 } 136 } 137 #endif /* STREAMSPTY */ 138 139 /* more cases, like open /dev/ptmx, etc */ 140 141 exit(77); 142 } 143 144 /* 145 * 146 */ 147 148 static char * 149 iscmd(const char *buf, const char *s) 150 { 151 size_t len = strlen(s); 152 if (strncmp(buf, s, len) != 0) 153 return NULL; 154 return estrdup(buf + len); 155 } 156 157 static void 158 parse_configuration(const char *fn) 159 { 160 struct command *c; 161 char s[1024]; 162 char *str; 163 unsigned int lineno = 0; 164 FILE *cmd; 165 166 cmd = fopen(fn, "r"); 167 if (cmd == NULL) 168 err(1, "open: %s", fn); 169 170 while (fgets(s, sizeof(s), cmd) != NULL) { 171 172 s[strcspn(s, "#\n")] = '\0'; 173 lineno++; 174 175 c = calloc(1, sizeof(*c)); 176 if (c == NULL) 177 errx(1, "malloc"); 178 179 c->lineno = lineno; 180 (*next) = c; 181 next = &(c->next); 182 183 if ((str = iscmd(s, "expect ")) != NULL) { 184 c->type = CMD_EXPECT; 185 c->str = str; 186 } else if ((str = iscmd(s, "send ")) != NULL) { 187 c->type = CMD_SEND; 188 c->str = str; 189 } else if ((str = iscmd(s, "password ")) != NULL) { 190 c->type = CMD_PASSWORD; 191 c->str = str; 192 } else 193 errx(1, "Invalid command on line %d: %s", lineno, s); 194 } 195 196 fclose(cmd); 197 } 198 199 200 /* 201 * 202 */ 203 204 static int 205 eval_parent(pid_t pid) 206 { 207 struct command *c; 208 char in; 209 size_t len = 0; 210 ssize_t sret; 211 212 for (c = commands; c != NULL; c = c->next) { 213 switch(c->type) { 214 case CMD_EXPECT: 215 if (verbose) 216 printf("[expecting %s]", c->str); 217 len = 0; 218 alarm(timeout); 219 while((sret = read(master, &in, sizeof(in))) > 0) { 220 alarm(timeout); 221 printf("%c", in); 222 if (c->str[len] != in) { 223 len = 0; 224 continue; 225 } 226 len++; 227 if (c->str[len] == '\0') 228 break; 229 } 230 alarm(0); 231 if (alarmset == SIGALRM) 232 errx(1, "timeout waiting for %s (line %u)", 233 c->str, c->lineno); 234 else if (alarmset) 235 errx(1, "got a signal %d waiting for %s (line %u)", 236 alarmset, c->str, c->lineno); 237 if (sret <= 0) 238 errx(1, "end command while waiting for %s (line %u)", 239 c->str, c->lineno); 240 break; 241 case CMD_SEND: 242 case CMD_PASSWORD: { 243 size_t i = 0; 244 const char *msg = (c->type == CMD_PASSWORD) ? "****" : c->str; 245 246 if (verbose) 247 printf("[send %s]", msg); 248 249 len = strlen(c->str); 250 251 while (i < len) { 252 if (c->str[i] == '\\' && i < len - 1) { 253 char ctrl; 254 i++; 255 switch(c->str[i]) { 256 case 'n': ctrl = '\n'; break; 257 case 'r': ctrl = '\r'; break; 258 case 't': ctrl = '\t'; break; 259 default: 260 errx(1, "unknown control char %c (line %u)", 261 c->str[i], c->lineno); 262 } 263 if (net_write(master, &ctrl, 1) != 1) 264 errx(1, "command refused input (line %u)", c->lineno); 265 } else { 266 if (net_write(master, &c->str[i], 1) != 1) 267 errx(1, "command refused input (line %u)", c->lineno); 268 } 269 i++; 270 } 271 break; 272 } 273 default: 274 abort(); 275 } 276 } 277 while(read(master, &in, sizeof(in)) > 0) 278 printf("%c", in); 279 280 if (verbose) 281 printf("[end of program]\n"); 282 283 /* 284 * Fetch status from child 285 */ 286 { 287 int ret, status; 288 289 ret = waitpid(pid, &status, 0); 290 if (ret == -1) 291 err(1, "waitpid"); 292 if (WIFEXITED(status) && WEXITSTATUS(status)) 293 return WEXITSTATUS(status); 294 else if (WIFSIGNALED(status)) { 295 printf("killed by signal: %d\n", WTERMSIG(status)); 296 return 1; 297 } 298 } 299 return 0; 300 } 301 302 /* 303 * 304 */ 305 306 static struct getargs args[] = { 307 { "timeout", 't', arg_integer, &timeout, "timout", "seconds" }, 308 { "verbose", 'v', arg_counter, &verbose, "verbose debugging" }, 309 { "version", 0, arg_flag, &version_flag, "print version" }, 310 { "help", 0, arg_flag, &help_flag, NULL } 311 }; 312 313 static void 314 usage(int ret) 315 { 316 arg_printusage (args, sizeof(args)/sizeof(*args), NULL, "infile command.."); 317 exit (ret); 318 } 319 320 int 321 main(int argc, char **argv) 322 { 323 int optidx = 0; 324 pid_t pid; 325 326 setprogname(argv[0]); 327 328 if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx)) 329 usage(1); 330 331 if (help_flag) 332 usage (0); 333 334 if (version_flag) { 335 fprintf (stderr, "%s from %s-%s\n", getprogname(), PACKAGE, VERSION); 336 return 0; 337 } 338 339 argv += optidx; 340 argc -= optidx; 341 342 if (argc < 2) 343 usage(1); 344 345 parse_configuration(argv[0]); 346 347 argv += 1; 348 349 open_pty(); 350 351 pid = fork(); 352 switch (pid) { 353 case -1: 354 err(1, "Failed to fork"); 355 case 0: 356 357 if(setsid()<0) 358 err(1, "setsid"); 359 360 dup2(slave, STDIN_FILENO); 361 dup2(slave, STDOUT_FILENO); 362 dup2(slave, STDERR_FILENO); 363 closefrom(STDERR_FILENO + 1); 364 365 execvp(argv[0], argv); /* add NULL to end of array ? */ 366 err(1, "Failed to exec: %s", argv[0]); 367 default: 368 close(slave); 369 { 370 struct sigaction sa; 371 372 sa.sa_handler = caught_signal; 373 sa.sa_flags = 0; 374 sigemptyset (&sa.sa_mask); 375 376 sigaction(SIGALRM, &sa, NULL); 377 } 378 379 return eval_parent(pid); 380 } 381 } 382