*/
#ifndef lint
-static char rcsid[] = "$Id: main.c,v 1.19 1994/09/21 06:47:37 paulus Exp $";
+static char rcsid[] = "$Id: main.c,v 1.27 1995/08/16 01:39:08 paulus Exp $";
#endif
#include <stdio.h>
+#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
char *progname; /* Name of this program */
char hostname[MAXNAMELEN]; /* Our hostname */
-static char pidfilename[MAXPATHLEN];
-
+static char pidfilename[MAXPATHLEN]; /* name of pid file */
+static char default_devnam[MAXPATHLEN]; /* name of default device */
static pid_t pid; /* Our pid */
static pid_t pgrpid; /* Process Group ID */
static uid_t uid; /* Our real user-id */
int fd = -1; /* Device file descriptor */
-int s; /* Socket file descriptor */
int phase; /* where the link is at */
int kill_link;
int baud_rate;
+char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
+
/* prototypes */
static void hup __P((int));
static void term __P((int));
static void chld __P((int));
static void toggle_debug __P((int));
static void open_ccp __P((int));
+static void bad_signal __P((int));
static void get_input __P((void));
void establish_ppp __P((void));
extern char *ttyname __P((int));
extern char *getlogin __P((void));
+#ifdef ultrix
+#undef O_NONBLOCK
+#define O_NONBLOCK O_NDELAY
+#endif
+
/*
* PPP Data Link Layer "protocol" table.
* One entry per supported protocol.
p = ttyname(0);
if (p)
strcpy(devnam, p);
+ strcpy(default_devnam, devnam);
if (gethostname(hostname, MAXNAMELEN) < 0 ) {
perror("couldn't get hostname");
uid = getuid();
if (!ppp_available()) {
- fprintf(stderr, "Sorry - PPP is not available on this system\n");
+ fprintf(stderr, no_ppp_msg);
exit(1);
}
check_auth_options();
setipdefault();
+ /*
+ * If the user has specified the default device name explicitly,
+ * pretend they hadn't.
+ */
+ if (!default_device && strcmp(devnam, default_devnam) == 0)
+ default_device = 1;
+
/*
* Initialize system-dependent stuff and magic number package.
*/
}
syslog(LOG_NOTICE, "pppd %s.%d started by %s, uid %d",
VERSION, PATCHLEVEL, p, uid);
-
- /* Get an internet socket for doing socket ioctl's on. */
- if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
- syslog(LOG_ERR, "Couldn't create IP socket: %m");
- die(1);
- }
/*
* Compute mask of all interesting signals and install signal handlers
SIGNAL(SIGTERM, term); /* Terminate */
SIGNAL(SIGCHLD, chld);
- signal(SIGUSR1, toggle_debug); /* Toggle debug flag */
- signal(SIGUSR2, open_ccp); /* Reopen CCP */
+ SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
+ SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
+
+ /*
+ * Install a handler for other signals which would otherwise
+ * cause pppd to exit without cleaning up.
+ */
+ SIGNAL(SIGABRT, bad_signal);
+ SIGNAL(SIGALRM, bad_signal);
+ SIGNAL(SIGFPE, bad_signal);
+ SIGNAL(SIGILL, bad_signal);
+ SIGNAL(SIGPIPE, bad_signal);
+ SIGNAL(SIGQUIT, bad_signal);
+ SIGNAL(SIGSEGV, bad_signal);
+#ifdef SIGBUS
+ SIGNAL(SIGBUS, bad_signal);
+#endif
+#ifdef SIGEMT
+ SIGNAL(SIGEMT, bad_signal);
+#endif
+#ifdef SIGPOLL
+ SIGNAL(SIGPOLL, bad_signal);
+#endif
+#ifdef SIGPROF
+ SIGNAL(SIGPROF, bad_signal);
+#endif
+#ifdef SIGSYS
+ SIGNAL(SIGSYS, bad_signal);
+#endif
+#ifdef SIGTRAP
+ SIGNAL(SIGTRAP, bad_signal);
+#endif
+#ifdef SIGVTALRM
+ SIGNAL(SIGVTALRM, bad_signal);
+#endif
+#ifdef SIGXCPU
+ SIGNAL(SIGXCPU, bad_signal);
+#endif
+#ifdef SIGXFSZ
+ SIGNAL(SIGXFSZ, bad_signal);
+#endif
/*
* Lock the device if we've been asked to.
die(1);
}
- syslog(LOG_INFO, "Connected...");
+ syslog(LOG_INFO, "Serial connection established.");
sleep(1); /* give it time to set up its terminal */
}
-
+
/* set line speed, flow control, etc.; clear CLOCAL if modem option */
set_up_tty(fd, 0);
for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
wait_input(timeleft(&timo));
calltimeout();
+ get_input();
if (kill_link) {
lcp_close(0);
kill_link = 0;
}
open_ccp_flag = 0;
}
- get_input();
reap_kids(); /* Don't leave dead kids lying around */
}
/*
- * Run disconnector script, if requested
+ * Run disconnector script, if requested.
+ * First we need to reset non-blocking mode.
+ * XXX we may not be able to do this if the line has hung up!
*/
+ if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) >= 0)
+ initfdflags = -1;
+ disestablish_ppp();
if (disconnector) {
+ set_up_tty(fd, 1);
if (device_script(disconnector, fd, fd) < 0) {
syslog(LOG_WARNING, "disconnect script failed");
- die(1);
+ } else {
+ syslog(LOG_INFO, "Serial link disconnected.");
}
-
- syslog(LOG_INFO, "Disconnected...");
}
close_fd();
} while (persist);
- if (lockflag && !default_device)
- unlock();
-
- exit(0);
+ die(0);
}
u_char *p;
u_short protocol;
- for (;;) { /* Read all available packets */
- p = inpacket_buf; /* point to beginning of packet buffer */
+ p = inpacket_buf; /* point to beginning of packet buffer */
- len = read_packet(inpacket_buf);
- if (len < 0)
- return;
+ len = read_packet(inpacket_buf);
+ if (len < 0)
+ return;
- if (len == 0) {
- MAINDEBUG((LOG_DEBUG, "End of file on fd!"));
- hungup = 1;
- lcp_lowerdown(0); /* serial link is no longer available */
- phase = PHASE_DEAD;
- return;
- }
+ if (len == 0) {
+ syslog(LOG_NOTICE, "Modem hangup");
+ hungup = 1;
+ lcp_lowerdown(0); /* serial link is no longer available */
+ phase = PHASE_DEAD;
+ return;
+ }
- if (debug /*&& (debugflags & DBG_INPACKET)*/)
- log_packet(p, len, "rcvd ");
+ if (debug /*&& (debugflags & DBG_INPACKET)*/)
+ log_packet(p, len, "rcvd ");
- if (len < PPP_HDRLEN) {
- MAINDEBUG((LOG_INFO, "io(): Received short packet."));
- return;
- }
+ if (len < PPP_HDRLEN) {
+ MAINDEBUG((LOG_INFO, "io(): Received short packet."));
+ return;
+ }
- p += 2; /* Skip address and control */
- GETSHORT(protocol, p);
- len -= PPP_HDRLEN;
+ p += 2; /* Skip address and control */
+ GETSHORT(protocol, p);
+ len -= PPP_HDRLEN;
- /*
- * Toss all non-LCP packets unless LCP is OPEN.
- */
- if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
- MAINDEBUG((LOG_INFO,
- "io(): Received non-LCP packet when LCP not open."));
+ /*
+ * Toss all non-LCP packets unless LCP is OPEN.
+ */
+ if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
+ MAINDEBUG((LOG_INFO,
+ "io(): Received non-LCP packet when LCP not open."));
+ return;
+ }
+
+ /*
+ * Upcall the proper protocol input routine.
+ */
+ for (i = 0; i < sizeof (prottbl) / sizeof (struct protent); i++) {
+ if (prottbl[i].protocol == protocol) {
+ (*prottbl[i].input)(0, p, len);
return;
}
-
- /*
- * Upcall the proper protocol input routine.
- */
- for (i = 0; i < sizeof (prottbl) / sizeof (struct protent); i++)
- if (prottbl[i].protocol == protocol) {
- (*prottbl[i].input)(0, p, len);
- break;
- } else if (protocol == (prottbl[i].protocol & ~0x8000)
- && prottbl[i].datainput != NULL) {
- (*prottbl[i].datainput)(0, p, len);
- break;
- }
-
- if (i == sizeof (prottbl) / sizeof (struct protent)) {
- if (debug)
- syslog(LOG_WARNING, "Unknown protocol (0x%x) received",
- protocol);
- lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
+ if (protocol == (prottbl[i].protocol & ~0x8000)
+ && prottbl[i].datainput != NULL) {
+ (*prottbl[i].datainput)(0, p, len);
+ return;
}
}
+
+ if (debug)
+ syslog(LOG_WARNING, "Unknown protocol (0x%x) received", protocol);
+ lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
}
/*
- * quit - Clean up state and exit.
+ * bad_signal - We've caught a fatal signal. Clean up state and exit.
+ */
+static void
+bad_signal(sig)
+ int sig;
+{
+ syslog(LOG_ERR, "Fatal signal %d", sig);
+ die(1);
+}
+
+/*
+ * quit - Clean up state and exit (with an error indication).
*/
void
quit()
{
- die(0);
+ die(1);
}
/*
void
close_fd()
{
+ disestablish_ppp();
+
/* drop dtr to hang up */
if (modem)
setdtr(fd, FALSE);
syslog(LOG_WARNING, "Couldn't restore device fd flags: %m");
initfdflags = -1;
- disestablish_ppp();
-
restore_tty();
close(fd);
{
struct callout *newp, *p, **pp;
- MAINDEBUG((LOG_DEBUG, "Timeout %x:%x in %d seconds.",
- (int) func, (int) arg, time));
+ MAINDEBUG((LOG_DEBUG, "Timeout %lx:%lx in %d seconds.",
+ (long) func, (long) arg, time));
/*
* Allocate timeout.
* Find correct place and link it in.
*/
for (pp = &callout; (p = *pp); pp = &p->c_next)
- if (p->c_time.tv_sec < newp->c_time.tv_sec
- || (p->c_time.tv_sec == newp->c_time.tv_sec
- && p->c_time.tv_usec <= newp->c_time.tv_sec))
+ if (newp->c_time.tv_sec < p->c_time.tv_sec
+ || (newp->c_time.tv_sec == p->c_time.tv_sec
+ && newp->c_time.tv_usec < p->c_time.tv_sec))
break;
newp->c_next = p;
*pp = newp;
struct callout **copp, *freep;
int reschedule = 0;
- MAINDEBUG((LOG_DEBUG, "Untimeout %x:%x.", (int) func, (int) arg));
+ MAINDEBUG((LOG_DEBUG, "Untimeout %lx:%lx.", (long) func, (long) arg));
/*
* Find first matching timeout and remove it from the list.
{
int pid;
int status;
- sigset_t mask;
-
- sigemptyset(&mask);
- sigaddset(&mask, SIGINT);
- sigaddset(&mask, SIGHUP);
- sigprocmask(SIG_BLOCK, &mask, &mask);
+ int errfd;
pid = fork();
}
if (pid == 0) {
- setreuid(getuid(), getuid());
- setregid(getgid(), getgid());
- sigprocmask(SIG_SETMASK, &mask, NULL);
dup2(in, 0);
dup2(out, 1);
+ errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0644);
+ if (errfd >= 0)
+ dup2(errfd, 2);
+ setuid(getuid());
+ setgid(getgid());
execl("/bin/sh", "sh", "-c", program, (char *)0);
syslog(LOG_ERR, "could not exec /bin/sh: %m");
_exit(99);
syslog(LOG_ERR, "error waiting for (dis)connection process: %m");
die(1);
}
- sigprocmask(SIG_SETMASK, &mask, NULL);
return (status == 0 ? 0 : -1);
}
int must_exist;
{
int pid;
+ char *nullenv[1];
pid = fork();
if (pid == -1) {
return -1;
}
if (pid == 0) {
- int new_fd;
+ int new_fd;
/* Leave the current location */
(void) setsid(); /* No controlling tty. */
- (void) umask (0); /* no umask. Must change in script. */
+ (void) umask (S_IRWXG|S_IRWXO);
(void) chdir ("/"); /* no current directory. */
+ setuid(geteuid());
+ setgid(getegid());
/* Ensure that nothing of our device environment is inherited. */
close (0);
close (1);
close (2);
- close (s); /* Socket interface to the ppp device */
close (fd); /* tty interface to the ppp device */
-
+ /* XXX should call sysdep cleanup procedure here */
+
/* Don't pass handles to the PPP device, even by accident. */
new_fd = open (_PATH_DEVNULL, O_RDWR);
if (new_fd >= 0) {
dup2 (0, 2); /* stderr -> /dev/null */
}
+#ifdef BSD
/* Force the priority back to zero if pppd is running higher. */
if (setpriority (PRIO_PROCESS, 0, 0) < 0)
syslog (LOG_WARNING, "can't reset priority to 0: %m");
+#endif
/* SysV recommends a second fork at this point. */
- /* run the program */
- execv(prog, args);
+ /* run the program; give it a null environment */
+ nullenv[0] = NULL;
+ execve(prog, args, nullenv);
if (must_exist || errno != ENOENT)
syslog(LOG_WARNING, "Can't execute %s: %m", prog);
_exit(-1);
projects / ppp.git / blobdiff