--- /dev/null
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+ Ty Coon, President of Vice
+
+That's all there is to it!
--- /dev/null
+/* miniexpect example.
+ * Copyright (C) 2014 Red Hat Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/* There is a program called 'sshpass' which does roughly the same
+ * as this simplified example. We run ssh as a subprocess, and log
+ * in using the given password from the command line.
+ *
+ * The first argument is the password to send at the password prompt.
+ * The remaining arguments are passed to the ssh subprocess.
+ *
+ * For example:
+ * sshpass 123456 ssh remote.example.com
+ * sshpass 123456 ssh -l root remote.example.com
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <assert.h>
+
+#include <pcre.h>
+
+#include "miniexpect.h"
+
+static pcre *
+compile_re (const char *rex)
+{
+ const char *errptr;
+ int erroffset;
+ pcre *ret;
+
+ ret = pcre_compile (rex, 0, &errptr, &erroffset, NULL);
+ if (ret == NULL) {
+ fprintf (stderr, "error: failed to compile regular expression '%s': %s at offset %d\n",
+ rex, errptr, erroffset);
+ exit (EXIT_FAILURE);
+ }
+ return ret;
+}
+
+int
+main (int argc, char *argv[])
+{
+ mexp_h *h;
+ const char *password;
+ int status;
+ pcre *password_re, *prompt_re, *hello_re;
+ const int ovecsize = 12;
+ int ovector[ovecsize];
+ int pcre_err;
+
+ if (argc <= 3) {
+ fprintf (stderr, "usage: sshpass PASSWORD ssh [SSH-ARGS...] HOST\n");
+ exit (EXIT_FAILURE);
+ }
+
+ password = argv[1];
+
+ printf ("starting ssh command ...\n");
+
+ h = mexp_spawnv ("ssh", &argv[2]);
+ if (h == NULL) {
+ perror ("mexp_spawnv: ssh");
+ exit (EXIT_FAILURE);
+ }
+
+ /* Wait for the password prompt. */
+ password_re = compile_re ("assword");
+ switch (mexp_expect (h, password_re, NULL, 0, ovector, ovecsize, &pcre_err)) {
+ case MEXP_EOF:
+ fprintf (stderr, "error: ssh closed the connection unexpectedly\n");
+ goto error;
+ case MEXP_ERROR:
+ perror ("mexp_expect");
+ goto error;
+ case MEXP_TIMEOUT:
+ fprintf (stderr, "error: timeout before reaching the password prompt\n");
+ goto error;
+ case MEXP_PCRE_ERROR:
+ fprintf (stderr, "error: PCRE error: %d\n", pcre_err);
+ goto error;
+ case MEXP_MATCHED:
+ break;
+ }
+
+ /* Got the password prompt, so send a password. */
+ printf ("sending the password ...\n");
+
+ if (mexp_printf (h, "%s\n", password) == -1) {
+ perror ("mexp_printf");
+ goto error;
+ }
+
+ /* We have to wait for the prompt before we can send commands
+ * (because the ssh connection may not be fully established). If we
+ * get "password" again, then probably the password was wrong. This
+ * expect checks all these possibilities. Unfortunately since all
+ * prompts are a little bit different, we have to guess here.
+ */
+ prompt_re = compile_re ("(assword)|([#$])");
+ switch (mexp_expect (h, prompt_re, NULL, 0, ovector, ovecsize, &pcre_err)) {
+ case MEXP_EOF:
+ fprintf (stderr, "error: ssh closed the connection unexpectedly\n");
+ goto error;
+ case MEXP_ERROR:
+ perror ("mexp_expect");
+ goto error;
+ case MEXP_TIMEOUT:
+ fprintf (stderr, "error: timeout before reaching the prompt\n");
+ goto error;
+ case MEXP_PCRE_ERROR:
+ fprintf (stderr, "error: PCRE error: %d\n", pcre_err);
+ goto error;
+ case MEXP_MATCHED:
+ /* Which part of the regexp matched? */
+ if (ovector[2] >= 0) { /* password */
+ fprintf (stderr, "error: ssh asked for password again, probably the password supplied is wrong\n");
+ goto error;
+ }
+ else if (ovector[4] >= 0) { /* prompt */
+ break;
+ }
+ else
+ abort (); /* shouldn't happen */
+ }
+
+ /* Send a command which will have expected output. */
+ printf ("sending a test command ...\n");
+
+ if (mexp_printf (h, "echo h''ello\n") == -1) {
+ perror ("mexp_printf");
+ goto error;
+ }
+
+ /* Wait for expected output from echo hello command. */
+ hello_re = compile_re ("hello");
+ switch (mexp_expect (h, hello_re, NULL, 0, ovector, ovecsize, &pcre_err)) {
+ case MEXP_EOF:
+ fprintf (stderr, "error: ssh closed the connection unexpectedly\n");
+ goto error;
+ case MEXP_ERROR:
+ perror ("mexp_expect");
+ goto error;
+ case MEXP_TIMEOUT:
+ fprintf (stderr, "error: timeout before reading command output\n");
+ goto error;
+ case MEXP_PCRE_ERROR:
+ fprintf (stderr, "error: PCRE error: %d\n", pcre_err);
+ goto error;
+ case MEXP_MATCHED:
+ break;
+ }
+
+ /* Send exit command and wait for ssh to exit. */
+ printf ("sending the exit command ...\n");
+
+ if (mexp_printf (h, "exit\n") == -1) {
+ perror ("mexp_printf");
+ goto error;
+ }
+
+ switch (mexp_expect (h, NULL, NULL, 0, NULL, 0, NULL)) {
+ case MEXP_EOF:
+ /* This is what we're expecting: ssh will close the connection. */
+ break;
+ case MEXP_ERROR:
+ perror ("mexp_expect");
+ goto error;
+ case MEXP_TIMEOUT:
+ fprintf (stderr, "error: timeout before ssh closed the connection\n");
+ goto error;
+ case MEXP_PCRE_ERROR:
+ case MEXP_MATCHED:
+ fprintf (stderr, "error: unexpected return value from mexp_expect\n");
+ goto error;
+ }
+
+ /* Close the ssh connection. */
+ status = mexp_close (h);
+ if (status != 0) {
+ fprintf (stderr, "error: bad exit status from ssh subprocess (status=%d)\n",
+ status);
+ exit (EXIT_FAILURE);
+ }
+
+ printf ("test was successful\n");
+
+ exit (EXIT_SUCCESS);
+
+ error:
+ mexp_close (h);
+ exit (EXIT_FAILURE);
+}
--- /dev/null
+/* miniexpect
+ * Copyright (C) 2014 Red Hat Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <poll.h>
+#include <errno.h>
+#include <termios.h>
+#include <time.h>
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/time.h>
+
+#include <pcre.h>
+
+#include "miniexpect.h"
+
+#define DEBUG 0
+
+static mexp_h *
+create_handle (void)
+{
+ mexp_h *h = malloc (sizeof *h);
+ if (h == NULL)
+ return NULL;
+
+ /* Initialize the fields to default values. */
+ h->fd = -1;
+ h->pid = 0;
+ h->timeout = 60000;
+ h->read_size = 1024;
+ h->buffer = NULL;
+ h->len = h->alloc = 0;
+ h->user1 = h->user2 = h->user3 = NULL;
+
+ return h;
+}
+
+static void
+clear_buffer (mexp_h *h)
+{
+ free (h->buffer);
+ h->buffer = NULL;
+ h->alloc = h->len = 0;
+}
+
+int
+mexp_close (mexp_h *h)
+{
+ int status = 0;
+
+ free (h->buffer);
+
+ if (h->fd >= 0)
+ close (h->fd);
+ if (h->pid > 0) {
+ if (waitpid (h->pid, &status, 0) == -1)
+ return -1;
+ }
+
+ return status;
+}
+
+mexp_h *
+mexp_spawnl (const char *file, const char *arg, ...)
+{
+ char **argv, **new_argv;
+ size_t i;
+ va_list args;
+ mexp_h *h;
+
+ argv = malloc (sizeof (char *));
+ if (argv == NULL)
+ return NULL;
+ argv[0] = (char *) arg;
+
+ va_start (args, arg);
+ for (i = 1; arg != NULL; ++i) {
+ arg = va_arg (args, const char *);
+ new_argv = realloc (argv, sizeof (char *) * (i+1));
+ if (new_argv == NULL) {
+ free (argv);
+ return NULL;
+ }
+ argv = new_argv;
+ argv[i] = (char *) arg;
+ }
+
+ h = mexp_spawnv (file, argv);
+ free (argv);
+ return h;
+}
+
+mexp_h *
+mexp_spawnv (const char *file, char **argv)
+{
+ mexp_h *h;
+ int fd = -1;
+ int err;
+ char slave[1024];
+ pid_t pid = 0;
+
+ fd = posix_openpt (O_RDWR|O_NOCTTY);
+ if (fd == -1)
+ goto error;
+
+ if (grantpt (fd) == -1)
+ goto error;
+
+ if (unlockpt (fd) == -1)
+ goto error;
+
+ /* Get the slave pty name now, but don't open it in the parent. */
+ if (ptsname_r (fd, slave, sizeof slave) != 0)
+ goto error;
+
+ /* Create the handle last before we fork. */
+ h = create_handle ();
+ if (h == NULL)
+ goto error;
+
+ pid = fork ();
+ if (pid == -1)
+ goto error;
+
+ if (pid == 0) { /* Child. */
+ struct termios terminal_settings;
+ int slave_fd;
+
+ setsid ();
+
+ /* Open the slave side of the pty. We must do this in the child
+ * after setsid so it becomes our controlling tty.
+ */
+ slave_fd = open (slave, O_RDWR);
+ if (slave_fd == -1)
+ goto error;
+
+ /* Set raw mode. */
+ tcgetattr (slave_fd, &terminal_settings);
+ cfmakeraw (&terminal_settings);
+ tcsetattr (slave_fd, TCSANOW, &terminal_settings);
+
+ /* Set up stdin, stdout, stderr to point to the pty. */
+ dup2 (slave_fd, 0);
+ dup2 (slave_fd, 1);
+ dup2 (slave_fd, 2);
+ close (slave_fd);
+
+ /* Close the master side of the pty - do this late to avoid a
+ * kernel bug, see sshpass source code.
+ */
+ close (fd);
+
+ /* Run the subprocess. */
+ execvp (file, argv);
+ perror (file);
+ _exit (EXIT_FAILURE);
+ }
+
+ /* Parent. */
+
+ h->fd = fd;
+ h->pid = pid;
+ return h;
+
+ error:
+ err = errno;
+ if (fd >= 0)
+ close (fd);
+ if (pid > 0)
+ waitpid (pid, NULL, 0);
+ errno = err;
+ return NULL;
+}
+
+enum mexp_status
+mexp_expect (mexp_h *h, const pcre *code,
+ const pcre_extra *extra,
+ int options, int *ovector, int ovecsize,
+ int *pcre_ret)
+{
+ time_t start_t, now_t;
+ int timeout;
+ struct pollfd pfds[1];
+ int r;
+ ssize_t rs;
+
+ time (&start_t);
+
+ options |= PCRE_PARTIAL_SOFT;
+
+ /* Clear the read buffer. */
+ clear_buffer (h);
+
+ for (;;) {
+ /* If we've got a timeout then work out how many seconds are left.
+ * Timeout == 0 is not particularly well-defined, but it probably
+ * means "return immediately if there's no data to be read".
+ */
+ if (h->timeout >= 0) {
+ time (&now_t);
+ timeout = h->timeout - ((now_t - start_t) * 1000);
+ if (timeout < 0)
+ timeout = 0;
+ }
+ else
+ timeout = 0;
+
+ pfds[0].fd = h->fd;
+ pfds[0].events = POLLIN;
+ pfds[0].revents = 0;
+ r = poll (pfds, 1, timeout);
+#if DEBUG
+ fprintf (stderr, "DEBUG: poll returned %d\n", r);
+#endif
+ if (r == -1)
+ return MEXP_ERROR;
+
+ if (r == 0)
+ return MEXP_TIMEOUT;
+
+ /* Otherwise we expect there is something to read from the file
+ * descriptor.
+ */
+ if (h->alloc - h->len <= h->read_size) {
+ char *new_buffer;
+ /* +1 here allows us to store \0 after the data read */
+ new_buffer = realloc (h->buffer, h->alloc + h->read_size + 1);
+ if (new_buffer == NULL)
+ return MEXP_ERROR;
+ h->buffer = new_buffer;
+ h->alloc += h->read_size;
+ }
+ rs = read (h->fd, h->buffer + h->len, h->read_size);
+#if DEBUG
+ fprintf (stderr, "DEBUG: read returned %zd\n", rs);
+#endif
+ if (rs == -1) {
+ /* Annoyingly on Linux (I'm fairly sure this is a bug) if the
+ * writer closes the connection, the entire pty is destroyed,
+ * and read returns -1 / EIO. Handle that special case here.
+ */
+ if (errno == EIO)
+ return MEXP_EOF;
+ return MEXP_ERROR;
+ }
+ if (rs == 0)
+ return MEXP_EOF;
+
+ /* We read something. */
+ h->len += rs;
+ h->buffer[h->len] = '\0';
+#if DEBUG
+ fprintf (stderr, "DEBUG: read %zd bytes from pty\n", rs);
+ fprintf (stderr, "DEBUG: buffer content: %s\n", h->buffer);
+#endif
+
+ /* See if there is a full or partial match against the regular expression. */
+ if (code) {
+ assert (h->buffer != NULL);
+ r = pcre_exec (code, extra, h->buffer, (int)h->len, 0,
+ options, ovector, ovecsize);
+ if (pcre_ret)
+ *pcre_ret = r;
+
+ if (r >= 0) {
+ /* A full match. */
+ return MEXP_MATCHED;
+ }
+
+ else if (r == PCRE_ERROR_NOMATCH) {
+ /* No match at all, so we can dump the input buffer. */
+ clear_buffer (h);
+ }
+
+ else if (r == PCRE_ERROR_PARTIAL) {
+ /* Partial match. Keep the buffer and keep reading. */
+ /* (nothing here) */
+ }
+
+ else {
+ /* An actual PCRE error. */
+ return MEXP_PCRE_ERROR;
+ }
+ } /* if (code) */
+ }
+}
+
+int
+mexp_printf (mexp_h *h, const char *fs, ...)
+{
+ va_list args;
+ char *msg;
+ int len;
+ size_t n;
+ ssize_t r;
+ char *p;
+
+ va_start (args, fs);
+ len = vasprintf (&msg, fs, args);
+ va_end (args);
+
+ if (len < 0)
+ return -1;
+
+#if DEBUG
+ fprintf (stderr, "DEBUG: writing: %s\n", msg);
+#endif
+
+ n = len;
+ p = msg;
+ while (n > 0) {
+ r = write (h->fd, p, n);
+ if (r == -1) {
+ free (msg);
+ return -1;
+ }
+ n -= r;
+ p += r;
+ }
+
+ free (msg);
+ return len;
+}
git.annexia.org / miniexpect.git / commitdiff