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8b45548804
it returns. This allows it to connect to the server side again, which has been listening on IPv6 addresses exclusively for more than 2 years. PR: 59369
677 lines
19 KiB
C
677 lines
19 KiB
C
/*-
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* Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <sys/un.h>
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#include <netdb.h>
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#include <sys/time.h>
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#include <err.h>
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#include <errno.h>
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#include <histedit.h>
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#include <semaphore.h>
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#include <pthread.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#define LINELEN 2048
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/* Data passed to the threads we create */
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struct thread_data {
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EditLine *edit; /* libedit stuff */
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History *hist; /* libedit stuff */
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pthread_t trm; /* Terminal thread (for pthread_kill()) */
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int ppp; /* ppp descriptor */
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};
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/* Flags passed to Receive() */
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#define REC_PASSWD (1) /* Handle a password request from ppp */
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#define REC_SHOW (2) /* Show everything except prompts */
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#define REC_VERBOSE (4) /* Show everything */
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static char *passwd;
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static char *prompt; /* Tell libedit what the current prompt is */
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static int data = -1; /* setjmp() has been done when data != -1 */
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static jmp_buf pppdead; /* Jump the Terminal thread out of el_gets() */
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static int timetogo; /* Tell the Monitor thread to exit */
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static sem_t sem_select; /* select() co-ordination between threads */
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static int TimedOut; /* Set if our connect() timed out */
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static int want_sem_post; /* Need to let the Monitor thread in ? */
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/*
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* How to use pppctl...
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*/
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static int
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usage()
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{
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fprintf(stderr, "usage: pppctl [-v] [-t n] [-p passwd] "
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"Port|LocalSock [command[;command]...]\n");
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fprintf(stderr, " -v tells pppctl to output all"
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" conversation\n");
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fprintf(stderr, " -t n specifies a timeout of n"
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" seconds when connecting (default 2)\n");
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fprintf(stderr, " -p passwd specifies your password\n");
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exit(1);
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}
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/*
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* Handle the SIGALRM received due to a connect() timeout.
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*/
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static void
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Timeout(int Sig)
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{
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TimedOut = 1;
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}
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/*
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* A callback routine for libedit to find out what the current prompt is.
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* All the work is done in Receive() below.
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*/
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static char *
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GetPrompt(EditLine *e)
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{
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if (prompt == NULL)
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prompt = "";
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return prompt;
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}
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/*
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* Receive data from the ppp descriptor.
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* We also handle password prompts here (if asked via the `display' arg)
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* and buffer what our prompt looks like (via the `prompt' global).
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*/
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static int
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Receive(int fd, int display)
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{
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static char Buffer[LINELEN];
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struct timeval t;
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int Result;
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char *last;
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fd_set f;
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int len;
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FD_ZERO(&f);
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FD_SET(fd, &f);
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t.tv_sec = 0;
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t.tv_usec = 100000;
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prompt = Buffer;
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len = 0;
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while (Result = read(fd, Buffer+len, sizeof(Buffer)-len-1), Result != -1) {
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if (Result == 0 && errno != EINTR) {
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Result = -1;
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break;
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}
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len += Result;
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Buffer[len] = '\0';
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if (len > 2 && !strcmp(Buffer+len-2, "> ")) {
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prompt = strrchr(Buffer, '\n');
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if (display & (REC_SHOW|REC_VERBOSE)) {
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if (display & REC_VERBOSE)
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last = Buffer+len-1;
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else
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last = prompt;
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if (last) {
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last++;
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write(STDOUT_FILENO, Buffer, last-Buffer);
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}
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}
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prompt = prompt == NULL ? Buffer : prompt+1;
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for (last = Buffer+len-2; last > Buffer && *last != ' '; last--)
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;
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if (last > Buffer+3 && !strncmp(last-3, " on", 3)) {
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/* a password is required ! */
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if (display & REC_PASSWD) {
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/* password time */
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if (!passwd)
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passwd = getpass("Password: ");
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sprintf(Buffer, "passwd %s\n", passwd);
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memset(passwd, '\0', strlen(passwd));
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if (display & REC_VERBOSE)
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write(STDOUT_FILENO, Buffer, strlen(Buffer));
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write(fd, Buffer, strlen(Buffer));
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memset(Buffer, '\0', strlen(Buffer));
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return Receive(fd, display & ~REC_PASSWD);
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}
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Result = 1;
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} else
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Result = 0;
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break;
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} else
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prompt = "";
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if (len == sizeof Buffer - 1) {
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int flush;
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if ((last = strrchr(Buffer, '\n')) == NULL)
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/* Yeuch - this is one mother of a line ! */
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flush = sizeof Buffer / 2;
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else
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flush = last - Buffer + 1;
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write(STDOUT_FILENO, Buffer, flush);
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strcpy(Buffer, Buffer + flush);
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len -= flush;
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}
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if ((Result = select(fd + 1, &f, NULL, NULL, &t)) <= 0) {
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if (len)
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write(STDOUT_FILENO, Buffer, len);
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break;
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}
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}
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return Result;
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}
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/*
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* Handle being told by the Monitor thread that there's data to be read
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* on the ppp descriptor.
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*
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* Note, this is a signal handler - be careful of what we do !
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*/
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static void
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InputHandler(int sig)
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{
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static char buf[LINELEN];
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struct timeval t;
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int len;
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fd_set f;
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if (data != -1) {
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FD_ZERO(&f);
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FD_SET(data, &f);
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t.tv_sec = t.tv_usec = 0;
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if (select(data + 1, &f, NULL, NULL, &t) > 0) {
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len = read(data, buf, sizeof buf);
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if (len > 0)
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write(STDOUT_FILENO, buf, len);
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else if (data != -1)
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longjmp(pppdead, -1);
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}
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sem_post(&sem_select);
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} else
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/* Don't let the Monitor thread in 'till we've set ``data'' up again */
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want_sem_post = 1;
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}
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/*
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* This is a simple wrapper for el_gets(), allowing our SIGUSR1 signal
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* handler (above) to take effect only after we've done a setjmp().
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*
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* We don't want it to do anything outside of here as we're going to
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* service the ppp descriptor anyway.
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*/
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static const char *
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SmartGets(EditLine *e, int *count, int fd)
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{
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const char *result;
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if (setjmp(pppdead))
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result = NULL;
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else {
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data = fd;
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if (want_sem_post)
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/* Let the Monitor thread in again */
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sem_post(&sem_select);
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result = el_gets(e, count);
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}
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data = -1;
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return result;
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}
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/*
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* The Terminal thread entry point.
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*
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* The bulk of the interactive work is done here. We read the terminal,
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* write the results to our ppp descriptor and read the results back.
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*
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* While reading the terminal (using el_gets()), it's possible to take
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* a SIGUSR1 from the Monitor thread, telling us that the ppp descriptor
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* has some data. The data is read and displayed by the signal handler
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* itself.
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*/
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static void *
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Terminal(void *v)
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{
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struct sigaction act, oact;
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struct thread_data *td;
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const char *l;
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int len;
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#ifndef __OpenBSD__
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HistEvent hev = { 0, "" };
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#endif
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act.sa_handler = InputHandler;
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sigemptyset(&act.sa_mask);
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act.sa_flags = SA_RESTART;
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sigaction(SIGUSR1, &act, &oact);
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td = (struct thread_data *)v;
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want_sem_post = 1;
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while ((l = SmartGets(td->edit, &len, td->ppp))) {
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if (len > 1)
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#ifdef __OpenBSD__
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history(td->hist, H_ENTER, l);
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#else
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history(td->hist, &hev, H_ENTER, l);
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#endif
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write(td->ppp, l, len);
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if (Receive(td->ppp, REC_SHOW) != 0)
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break;
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}
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return NULL;
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}
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/*
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* The Monitor thread entry point.
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*
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* This thread simply monitors our ppp descriptor. When there's something
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* to read, a SIGUSR1 is sent to the Terminal thread.
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*
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* sem_select() is used by the Terminal thread to keep us from sending
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* flurries of SIGUSR1s, and is used from the main thread to wake us up
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* when it's time to exit.
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*/
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static void *
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Monitor(void *v)
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{
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struct thread_data *td;
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fd_set f;
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int ret;
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td = (struct thread_data *)v;
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FD_ZERO(&f);
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FD_SET(td->ppp, &f);
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sem_wait(&sem_select);
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while (!timetogo)
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if ((ret = select(td->ppp + 1, &f, NULL, NULL, NULL)) > 0) {
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pthread_kill(td->trm, SIGUSR1);
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sem_wait(&sem_select);
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}
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return NULL;
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}
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static const char *
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sockaddr_ntop(const struct sockaddr *sa)
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{
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const void *addr;
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static char addrbuf[INET6_ADDRSTRLEN];
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switch (sa->sa_family) {
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case AF_INET:
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addr = &((const struct sockaddr_in *)sa)->sin_addr;
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break;
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case AF_UNIX:
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addr = &((const struct sockaddr_un *)sa)->sun_path;
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break;
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case AF_INET6:
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addr = &((const struct sockaddr_in6 *)sa)->sin6_addr;
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break;
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default:
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return NULL;
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}
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inet_ntop(sa->sa_family, addr, addrbuf, sizeof(addrbuf));
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return addrbuf;
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}
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/*
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* Connect to ppp using either a local domain socket or a tcp socket.
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*
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* If we're given arguments, process them and quit, otherwise create two
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* threads to handle interactive mode.
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*/
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int
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main(int argc, char **argv)
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{
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struct sockaddr_un ifsun;
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int n, arg, fd, len, verbose, save_errno, hide1, hide1off, hide2;
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unsigned TimeoutVal;
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char *DoneWord = "x", *next, *start;
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struct sigaction act, oact;
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void *thread_ret;
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pthread_t mon;
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char Command[LINELEN];
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char Buffer[LINELEN];
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verbose = 0;
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TimeoutVal = 2;
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hide1 = hide1off = hide2 = 0;
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for (arg = 1; arg < argc; arg++)
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if (*argv[arg] == '-') {
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for (start = argv[arg] + 1; *start; start++)
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switch (*start) {
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case 't':
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TimeoutVal = (unsigned)atoi
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(start[1] ? start + 1 : argv[++arg]);
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start = DoneWord;
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break;
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case 'v':
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verbose = REC_VERBOSE;
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break;
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case 'p':
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if (start[1]) {
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hide1 = arg;
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hide1off = start - argv[arg];
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passwd = start + 1;
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} else {
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hide1 = arg;
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hide1off = start - argv[arg];
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passwd = argv[++arg];
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hide2 = arg;
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}
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start = DoneWord;
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break;
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default:
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usage();
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}
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}
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else
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break;
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if (argc < arg + 1)
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usage();
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if (hide1) {
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char title[1024];
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int pos, harg;
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for (harg = pos = 0; harg < argc; harg++)
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if (harg == 0 || harg != hide2) {
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if (harg == 0 || harg != hide1)
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n = snprintf(title + pos, sizeof title - pos, "%s%s",
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harg ? " " : "", argv[harg]);
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else if (hide1off > 1)
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n = snprintf(title + pos, sizeof title - pos, " %.*s",
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hide1off, argv[harg]);
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else
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n = 0;
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if (n < 0 || n >= sizeof title - pos)
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break;
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pos += n;
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}
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#ifdef __FreeBSD__
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setproctitle("-%s", title);
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#else
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setproctitle("%s", title);
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#endif
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}
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if (*argv[arg] == '/') {
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memset(&ifsun, '\0', sizeof ifsun);
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ifsun.sun_len = strlen(argv[arg]);
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if (ifsun.sun_len > sizeof ifsun.sun_path - 1) {
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warnx("%s: path too long", argv[arg]);
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return 1;
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}
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ifsun.sun_family = AF_LOCAL;
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strcpy(ifsun.sun_path, argv[arg]);
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if (fd = socket(AF_LOCAL, SOCK_STREAM, 0), fd < 0) {
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warnx("cannot create local domain socket");
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return 2;
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}
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if (connect(fd, (struct sockaddr *)&ifsun, sizeof(ifsun)) < 0) {
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if (errno)
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warn("cannot connect to socket %s", argv[arg]);
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else
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warnx("cannot connect to socket %s", argv[arg]);
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close(fd);
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return 3;
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}
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} else {
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char *addr, *p, *port;
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const char *caddr;
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struct addrinfo hints, *res, *pai;
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int gai;
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char local[] = "localhost";
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addr = argv[arg];
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if (addr[strspn(addr, "0123456789")] == '\0') {
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/* port on local machine */
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port = addr;
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addr = local;
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} else if (*addr == '[') {
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/* [addr]:port */
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if ((p = strchr(addr, ']')) == NULL) {
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warnx("%s: mismatched '['", addr);
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return 1;
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}
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addr++;
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*p++ = '\0';
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if (*p != ':') {
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warnx("%s: missing port", addr);
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return 1;
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}
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port = ++p;
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} else {
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/* addr:port */
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p = addr + strcspn(addr, ":");
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if (*p != ':') {
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warnx("%s: missing port", addr);
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return 1;
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}
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*p++ = '\0';
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port = p;
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}
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memset(&hints, 0, sizeof(hints));
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hints.ai_socktype = SOCK_STREAM;
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gai = getaddrinfo(addr, port, &hints, &res);
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if (gai != 0) {
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warnx("%s: %s", addr, gai_strerror(gai));
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return 1;
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}
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for (pai = res; pai != NULL; pai = pai->ai_next) {
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if (fd = socket(pai->ai_family, pai->ai_socktype,
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pai->ai_protocol), fd < 0) {
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warnx("cannot create socket");
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continue;
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}
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TimedOut = 0;
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if (TimeoutVal) {
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act.sa_handler = Timeout;
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sigemptyset(&act.sa_mask);
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act.sa_flags = 0;
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sigaction(SIGALRM, &act, &oact);
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alarm(TimeoutVal);
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}
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if (connect(fd, pai->ai_addr, pai->ai_addrlen) == 0)
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break;
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if (TimeoutVal) {
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save_errno = errno;
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alarm(0);
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sigaction(SIGALRM, &oact, 0);
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errno = save_errno;
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}
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caddr = sockaddr_ntop(pai->ai_addr);
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if (caddr == NULL)
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caddr = argv[arg];
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if (TimedOut)
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warnx("timeout: cannot connect to %s", caddr);
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else {
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if (errno)
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warn("cannot connect to %s", caddr);
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else
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warnx("cannot connect to %s", caddr);
|
|
}
|
|
close(fd);
|
|
}
|
|
freeaddrinfo(res);
|
|
if (pai == NULL)
|
|
return 1;
|
|
if (TimeoutVal) {
|
|
alarm(0);
|
|
sigaction(SIGALRM, &oact, 0);
|
|
}
|
|
}
|
|
|
|
len = 0;
|
|
Command[sizeof(Command)-1] = '\0';
|
|
for (arg++; arg < argc; arg++) {
|
|
if (len && len < sizeof(Command)-1)
|
|
strcpy(Command+len++, " ");
|
|
strncpy(Command+len, argv[arg], sizeof(Command)-len-1);
|
|
len += strlen(Command+len);
|
|
}
|
|
|
|
switch (Receive(fd, verbose | REC_PASSWD)) {
|
|
case 1:
|
|
fprintf(stderr, "Password incorrect\n");
|
|
break;
|
|
|
|
case 0:
|
|
passwd = NULL;
|
|
if (len == 0) {
|
|
struct thread_data td;
|
|
const char *env;
|
|
int size;
|
|
#ifndef __OpenBSD__
|
|
HistEvent hev = { 0, "" };
|
|
#endif
|
|
|
|
td.hist = history_init();
|
|
if ((env = getenv("EL_SIZE"))) {
|
|
size = atoi(env);
|
|
if (size < 0)
|
|
size = 20;
|
|
} else
|
|
size = 20;
|
|
#ifdef __OpenBSD__
|
|
history(td.hist, H_EVENT, size);
|
|
td.edit = el_init("pppctl", stdin, stdout);
|
|
#else
|
|
history(td.hist, &hev, H_SETSIZE, size);
|
|
td.edit = el_init("pppctl", stdin, stdout, stderr);
|
|
#endif
|
|
el_source(td.edit, NULL);
|
|
el_set(td.edit, EL_PROMPT, GetPrompt);
|
|
if ((env = getenv("EL_EDITOR"))) {
|
|
if (!strcmp(env, "vi"))
|
|
el_set(td.edit, EL_EDITOR, "vi");
|
|
else if (!strcmp(env, "emacs"))
|
|
el_set(td.edit, EL_EDITOR, "emacs");
|
|
}
|
|
el_set(td.edit, EL_SIGNAL, 1);
|
|
el_set(td.edit, EL_HIST, history, (const char *)td.hist);
|
|
|
|
td.ppp = fd;
|
|
td.trm = NULL;
|
|
|
|
/*
|
|
* We create two threads. The Terminal thread does all the
|
|
* work while the Monitor thread simply tells the Terminal
|
|
* thread when ``fd'' becomes readable. The telling is done
|
|
* by sending a SIGUSR1 to the Terminal thread. The
|
|
* sem_select semaphore is used to prevent the monitor
|
|
* thread from firing excessive signals at the Terminal
|
|
* thread (it's abused for exit handling too - see below).
|
|
*
|
|
* The Terminal thread never uses td.trm !
|
|
*/
|
|
sem_init(&sem_select, 0, 0);
|
|
|
|
pthread_create(&td.trm, NULL, Terminal, &td);
|
|
pthread_create(&mon, NULL, Monitor, &td);
|
|
|
|
/* Wait for the terminal thread to finish */
|
|
pthread_join(td.trm, &thread_ret);
|
|
fprintf(stderr, "Connection closed\n");
|
|
|
|
/* Get rid of the monitor thread by abusing sem_select */
|
|
timetogo = 1;
|
|
close(fd);
|
|
fd = -1;
|
|
sem_post(&sem_select);
|
|
pthread_join(mon, &thread_ret);
|
|
|
|
/* Restore our terminal and release resources */
|
|
el_end(td.edit);
|
|
history_end(td.hist);
|
|
sem_destroy(&sem_select);
|
|
} else {
|
|
start = Command;
|
|
do {
|
|
next = strchr(start, ';');
|
|
while (*start == ' ' || *start == '\t')
|
|
start++;
|
|
if (next)
|
|
*next = '\0';
|
|
strcpy(Buffer, start);
|
|
Buffer[sizeof(Buffer)-2] = '\0';
|
|
strcat(Buffer, "\n");
|
|
if (verbose)
|
|
write(STDOUT_FILENO, Buffer, strlen(Buffer));
|
|
write(fd, Buffer, strlen(Buffer));
|
|
if (Receive(fd, verbose | REC_SHOW) != 0) {
|
|
fprintf(stderr, "Connection closed\n");
|
|
break;
|
|
}
|
|
if (next)
|
|
start = ++next;
|
|
} while (next && *next);
|
|
if (verbose)
|
|
write(STDOUT_FILENO, "quit\n", 5);
|
|
write(fd, "quit\n", 5);
|
|
while (Receive(fd, verbose | REC_SHOW) == 0)
|
|
;
|
|
if (verbose)
|
|
puts("");
|
|
}
|
|
break;
|
|
|
|
default:
|
|
warnx("ppp is not responding");
|
|
break;
|
|
}
|
|
|
|
if (fd != -1)
|
|
close(fd);
|
|
|
|
return 0;
|
|
}
|