2 * Copyright (C) 2014 Red Hat Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
31 #include <sys/types.h>
37 #include "miniexpect.h"
44 mexp_h *h = malloc (sizeof *h);
48 /* Initialize the fields to default values. */
55 h->len = h->alloc = 0;
56 h->user1 = h->user2 = h->user3 = NULL;
62 clear_buffer (mexp_h *h)
66 h->alloc = h->len = 0;
70 mexp_close (mexp_h *h)
79 if (waitpid (h->pid, &status, 0) == -1)
89 mexp_spawnl (const char *file, const char *arg, ...)
91 char **argv, **new_argv;
96 argv = malloc (sizeof (char *));
99 argv[0] = (char *) arg;
101 va_start (args, arg);
102 for (i = 1; arg != NULL; ++i) {
103 arg = va_arg (args, const char *);
104 new_argv = realloc (argv, sizeof (char *) * (i+1));
105 if (new_argv == NULL) {
110 argv[i] = (char *) arg;
113 h = mexp_spawnv (file, argv);
119 mexp_spawnv (const char *file, char **argv)
127 fd = posix_openpt (O_RDWR|O_NOCTTY);
131 if (grantpt (fd) == -1)
134 if (unlockpt (fd) == -1)
137 /* Get the slave pty name now, but don't open it in the parent. */
138 if (ptsname_r (fd, slave, sizeof slave) != 0)
141 /* Create the handle last before we fork. */
142 h = create_handle ();
150 if (pid == 0) { /* Child. */
151 struct termios terminal_settings;
156 /* Open the slave side of the pty. We must do this in the child
157 * after setsid so it becomes our controlling tty.
159 slave_fd = open (slave, O_RDWR);
164 tcgetattr (slave_fd, &terminal_settings);
165 cfmakeraw (&terminal_settings);
166 tcsetattr (slave_fd, TCSANOW, &terminal_settings);
168 /* Set up stdin, stdout, stderr to point to the pty. */
174 /* Close the master side of the pty - do this late to avoid a
175 * kernel bug, see sshpass source code.
179 /* Run the subprocess. */
182 _exit (EXIT_FAILURE);
196 waitpid (pid, NULL, 0);
202 mexp_expect (mexp_h *h, const mexp_regexp *regexps, int *ovector, int ovecsize)
204 time_t start_t, now_t;
206 struct pollfd pfds[1];
212 /* Clear the read buffer. */
213 /* XXX This is possibly incorrect because it throws away inputs that
214 * may not have been matched yet. A better idea is to record the
215 * end of the previous match and only throw that away.
220 /* If we've got a timeout then work out how many seconds are left.
221 * Timeout == 0 is not particularly well-defined, but it probably
222 * means "return immediately if there's no data to be read".
224 if (h->timeout >= 0) {
226 timeout = h->timeout - ((now_t - start_t) * 1000);
234 pfds[0].events = POLLIN;
236 r = poll (pfds, 1, timeout);
238 fprintf (stderr, "DEBUG: poll returned %d\n", r);
246 /* Otherwise we expect there is something to read from the file
249 if (h->alloc - h->len <= h->read_size) {
251 /* +1 here allows us to store \0 after the data read */
252 new_buffer = realloc (h->buffer, h->alloc + h->read_size + 1);
253 if (new_buffer == NULL)
255 h->buffer = new_buffer;
256 h->alloc += h->read_size;
258 rs = read (h->fd, h->buffer + h->len, h->read_size);
260 fprintf (stderr, "DEBUG: read returned %zd\n", rs);
263 /* Annoyingly on Linux (I'm fairly sure this is a bug) if the
264 * writer closes the connection, the entire pty is destroyed,
265 * and read returns -1 / EIO. Handle that special case here.
274 /* We read something. */
276 h->buffer[h->len] = '\0';
278 fprintf (stderr, "DEBUG: read %zd bytes from pty\n", rs);
279 fprintf (stderr, "DEBUG: buffer content: %s\n", h->buffer);
282 /* See if there is a full or partial match against any regexp. */
285 int can_clear_buffer = 1;
287 assert (h->buffer != NULL);
289 for (i = 0; regexps[i].r > 0; ++i) {
290 int options = regexps[i].options | PCRE_PARTIAL_SOFT;
292 r = pcre_exec (regexps[i].re, regexps[i].extra,
293 h->buffer, (int)h->len, 0,
303 else if (r == PCRE_ERROR_NOMATCH) {
304 /* No match at all. */
308 else if (r == PCRE_ERROR_PARTIAL) {
309 /* Partial match. Keep the buffer and keep reading. */
310 can_clear_buffer = 0;
314 /* An actual PCRE error. */
315 return MEXP_PCRE_ERROR;
319 /* If none of the regular expressions matched (not partially)
320 * then we can clear the buffer. This is an optimization.
322 if (can_clear_buffer)
330 mexp_printf (mexp_h *h, const char *fs, ...)
340 len = vasprintf (&msg, fs, args);
347 fprintf (stderr, "DEBUG: writing: %s\n", msg);
353 r = write (h->fd, p, n);