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