1/* $NetBSD: rkpty.c,v 1.2 2017/01/28 21:31:50 christos Exp $ */ 2 3/* 4 * Copyright (c) 2008 Kungliga Tekniska H��gskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36#include "config.h" 37 38#ifndef HAVE_SYS_TYPES_H 39#include <sys/types.h> 40#endif 41#ifdef HAVE_SYS_WAIT_H 42#include <sys/wait.h> 43#endif 44#include <stdio.h> 45#include <stdlib.h> 46#ifdef HAVE_UNISTD_H 47#include <unistd.h> 48#endif 49#ifdef HAVE_PTY_H 50#include <pty.h> 51#endif 52#ifdef HAVE_UTIL_H 53#include <util.h> 54#endif 55#ifdef HAVE_LIBUTIL_H 56#include <libutil.h> 57#endif 58 59#ifdef STREAMSPTY 60#include <stropts.h> 61#endif /* STREAMPTY */ 62 63#include <krb5/roken.h> 64#include <krb5/getarg.h> 65 66struct command { 67 enum { CMD_EXPECT = 0, CMD_SEND, CMD_PASSWORD } type; 68 unsigned int lineno; 69 char *str; 70 struct command *next; 71}; 72 73/* 74 * 75 */ 76 77static struct command *commands, **next = &commands; 78 79static sig_atomic_t alarmset = 0; 80 81static int timeout = 10; 82static int verbose; 83static int help_flag; 84static int version_flag; 85 86static int master; 87static int slave; 88static char line[256] = { 0 }; 89 90static void 91caught_signal(int signo) 92{ 93 alarmset = signo; 94} 95 96 97static void 98open_pty(void) 99{ 100#ifdef _AIX 101 printf("implement open_pty\n"); 102 exit(77); 103#endif 104#if defined(HAVE_OPENPTY) || defined(__osf__) /* XXX */ 105 if(openpty(&master, &slave, line, 0, 0) == 0) 106 return; 107#endif /* HAVE_OPENPTY .... */ 108#ifdef STREAMSPTY 109 { 110 char *clone[] = { 111 "/dev/ptc", 112 "/dev/ptmx", 113 "/dev/ptm", 114 "/dev/ptym/clone", 115 NULL 116 }; 117 char **q; 118 119 for(q = clone; *q; q++){ 120 master = open(*q, O_RDWR); 121 if(master >= 0){ 122#ifdef HAVE_GRANTPT 123 grantpt(master); 124#endif 125#ifdef HAVE_UNLOCKPT 126 unlockpt(master); 127#endif 128 strlcpy(line, ptsname(master), sizeof(line)); 129 slave = open(line, O_RDWR); 130 if (slave < 0) 131 errx(1, "failed to open slave when using %s", *q); 132 ioctl(slave, I_PUSH, "ptem"); 133 ioctl(slave, I_PUSH, "ldterm"); 134 135 return; 136 } 137 } 138 } 139#endif /* STREAMSPTY */ 140 141 /* more cases, like open /dev/ptmx, etc */ 142 143 exit(77); 144} 145 146/* 147 * 148 */ 149 150static char * 151iscmd(const char *buf, const char *s) 152{ 153 size_t len = strlen(s); 154 if (strncmp(buf, s, len) != 0) 155 return NULL; 156 return estrdup(buf + len); 157} 158 159static void 160parse_configuration(const char *fn) 161{ 162 struct command *c; 163 char s[1024]; 164 char *str; 165 unsigned int lineno = 0; 166 FILE *cmd; 167 168 cmd = fopen(fn, "r"); 169 if (cmd == NULL) 170 err(1, "open: %s", fn); 171 172 while (fgets(s, sizeof(s), cmd) != NULL) { 173 174 s[strcspn(s, "#\n")] = '\0'; 175 lineno++; 176 177 c = calloc(1, sizeof(*c)); 178 if (c == NULL) 179 errx(1, "malloc"); 180 181 c->lineno = lineno; 182 (*next) = c; 183 next = &(c->next); 184 185 if ((str = iscmd(s, "expect ")) != NULL) { 186 c->type = CMD_EXPECT; 187 c->str = str; 188 } else if ((str = iscmd(s, "send ")) != NULL) { 189 c->type = CMD_SEND; 190 c->str = str; 191 } else if ((str = iscmd(s, "password ")) != NULL) { 192 c->type = CMD_PASSWORD; 193 c->str = str; 194 } else 195 errx(1, "Invalid command on line %d: %s", lineno, s); 196 } 197 198 fclose(cmd); 199} 200 201 202/* 203 * 204 */ 205 206static int 207eval_parent(pid_t pid) 208{ 209 struct command *c; 210 char in; 211 size_t len = 0; 212 ssize_t sret; 213 214 for (c = commands; c != NULL; c = c->next) { 215 switch(c->type) { 216 case CMD_EXPECT: 217 if (verbose) 218 printf("[expecting %s]", c->str); 219 len = 0; 220 alarm(timeout); 221 while((sret = read(master, &in, sizeof(in))) > 0) { 222 alarm(timeout); 223 printf("%c", in); 224 if (c->str[len] != in) { 225 len = 0; 226 continue; 227 } 228 len++; 229 if (c->str[len] == '\0') 230 break; 231 } 232 alarm(0); 233 if (alarmset == SIGALRM) 234 errx(1, "timeout waiting for %s (line %u)", 235 c->str, c->lineno); 236 else if (alarmset) 237 errx(1, "got a signal %d waiting for %s (line %u)", 238 (int)alarmset, c->str, c->lineno); 239 if (sret <= 0) 240 errx(1, "end command while waiting for %s (line %u)", 241 c->str, c->lineno); 242 break; 243 case CMD_SEND: 244 case CMD_PASSWORD: { 245 size_t i = 0; 246 const char *msg = (c->type == CMD_PASSWORD) ? "****" : c->str; 247 248 if (verbose) 249 printf("[send %s]", msg); 250 251 len = strlen(c->str); 252 253 while (i < len) { 254 if (c->str[i] == '\\' && i < len - 1) { 255 char ctrl; 256 i++; 257 switch(c->str[i]) { 258 case 'n': ctrl = '\n'; break; 259 case 'r': ctrl = '\r'; break; 260 case 't': ctrl = '\t'; break; 261 default: 262 errx(1, "unknown control char %c (line %u)", 263 c->str[i], c->lineno); 264 } 265 if (net_write(master, &ctrl, 1) != 1) 266 errx(1, "command refused input (line %u)", c->lineno); 267 } else { 268 if (net_write(master, &c->str[i], 1) != 1) 269 errx(1, "command refused input (line %u)", c->lineno); 270 } 271 i++; 272 } 273 break; 274 } 275 default: 276 abort(); 277 } 278 } 279 while(read(master, &in, sizeof(in)) > 0) 280 printf("%c", in); 281 282 if (verbose) 283 printf("[end of program]\n"); 284 285 /* 286 * Fetch status from child 287 */ 288 { 289 int ret, status; 290 291 ret = waitpid(pid, &status, 0); 292 if (ret == -1) 293 err(1, "waitpid"); 294 if (WIFEXITED(status) && WEXITSTATUS(status)) 295 return WEXITSTATUS(status); 296 else if (WIFSIGNALED(status)) { 297 printf("killed by signal: %d\n", WTERMSIG(status)); 298 return 1; 299 } 300 } 301 return 0; 302} 303 304/* 305 * 306 */ 307 308static struct getargs args[] = { 309 { "timeout", 't', arg_integer, &timeout, "timout", "seconds" }, 310 { "verbose", 'v', arg_counter, &verbose, "verbose debugging", NULL }, 311 { "version", 0, arg_flag, &version_flag, "print version", NULL }, 312 { "help", 0, arg_flag, &help_flag, NULL, NULL } 313}; 314 315static void 316usage(int ret) 317{ 318 arg_printusage (args, sizeof(args)/sizeof(*args), NULL, "infile command.."); 319 exit (ret); 320} 321 322int 323main(int argc, char **argv) 324{ 325 int optidx = 0; 326 pid_t pid; 327 328 setprogname(argv[0]); 329 330 if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx)) 331 usage(1); 332 333 if (help_flag) 334 usage (0); 335 336 if (version_flag) { 337 fprintf (stderr, "%s from %s-%s\n", getprogname(), PACKAGE, VERSION); 338 return 0; 339 } 340 341 argv += optidx; 342 argc -= optidx; 343 344 if (argc < 2) 345 usage(1); 346 347 parse_configuration(argv[0]); 348 349 argv += 1; 350 351 open_pty(); 352 353 pid = fork(); 354 switch (pid) { 355 case -1: 356 err(1, "Failed to fork"); 357 case 0: 358 359 if(setsid()<0) 360 err(1, "setsid"); 361 362 dup2(slave, STDIN_FILENO); 363 dup2(slave, STDOUT_FILENO); 364 dup2(slave, STDERR_FILENO); 365 closefrom(STDERR_FILENO + 1); 366 367 execvp(argv[0], argv); /* add NULL to end of array ? */ 368 err(1, "Failed to exec: %s", argv[0]); 369 default: 370 close(slave); 371 { 372 struct sigaction sa; 373 374 sa.sa_handler = caught_signal; 375 sa.sa_flags = 0; 376 sigemptyset (&sa.sa_mask); 377 378 sigaction(SIGALRM, &sa, NULL); 379 } 380 381 return eval_parent(pid); 382 } 383} 384