X-Git-Url: http://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=pppd%2Fmain.c;h=d278b071d95b3bbc40f13423de2e6db26db8a6bd;hp=37aeaeca9629e79d617ad29f2b1c9bb6ae713821;hb=dee72905271845128ad26cff5cf770c433f3f4a7;hpb=a115760c2c03a34dd5aa1ed7274ac49810d7dd45 diff --git a/pppd/main.c b/pppd/main.c index 37aeaec..d278b07 100644 --- a/pppd/main.c +++ b/pppd/main.c @@ -18,10 +18,11 @@ */ #ifndef lint -static char rcsid[] = "$Id: main.c,v 1.17 1994/09/01 00:28:14 paulus Exp $"; +static char rcsid[] = "$Id: main.c,v 1.28 1995/10/27 03:41:01 paulus Exp $"; #endif #include +#include #include #include #include @@ -39,7 +40,6 @@ static char rcsid[] = "$Id: main.c,v 1.17 1994/09/01 00:28:14 paulus Exp $"; #include #include -#include "ppp.h" #include "pppd.h" #include "magic.h" #include "fsm.h" @@ -59,61 +59,58 @@ static char rcsid[] = "$Id: main.c,v 1.17 1994/09/01 00:28:14 paulus Exp $"; #define REQ_SYSOPTIONS 1 #endif -static char *pidpath = _PATH_PIDFILE; - /* interface vars */ char ifname[IFNAMSIZ]; /* Interface name */ int ifunit; /* Interface unit number */ 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 open_ccp_flag; -static int initfdflags = -1; /* Initial file descriptor flags */ - -u_char outpacket_buf[MTU+DLLHEADERLEN]; /* buffer for outgoing packet */ -static u_char inpacket_buf[MTU+DLLHEADERLEN]; /* buffer for incoming packet */ +u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */ +static u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */ int hungup; /* terminal has been hung up */ static int n_children; /* # child processes still running */ -int baud_rate; - -/* prototypes */ -static void hup __ARGS((int)); -static void term __ARGS((int)); -static void chld __ARGS((int)); -static void toggle_debug __ARGS((int)); -static void open_ccp __ARGS((int)); - -static void get_input __ARGS((void)); -void establish_ppp __ARGS((void)); -void calltimeout __ARGS((void)); -struct timeval *timeleft __ARGS((struct timeval *)); -void reap_kids __ARGS((void)); -void cleanup __ARGS((int, caddr_t)); -void close_fd __ARGS((void)); -void die __ARGS((int)); -void novm __ARGS((char *)); - -void log_packet __ARGS((u_char *, int, char *)); -void format_packet __ARGS((u_char *, int, - void (*) (void *, char *, ...), void *)); -void pr_log __ARGS((void *, char *, ...)); - -extern char *ttyname __ARGS((int)); -extern char *getlogin __ARGS((void)); +int baud_rate; /* Actual bits/second for serial device */ + +char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n"; + +/* Prototypes for procedures local to this file. */ + +static void cleanup __P((void)); +static void close_fd __P((void)); +static void get_input __P((void)); +static void calltimeout __P((void)); +static struct timeval *timeleft __P((struct timeval *)); +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 int device_script __P((char *, int, int)); +static void reap_kids __P((void)); +static void pr_log __P((void *, char *, ...)); + +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. @@ -128,11 +125,16 @@ static struct protent { void (*datainput)(); char *name; } prottbl[] = { - { LCP, lcp_init, lcp_input, lcp_protrej, lcp_printpkt, NULL, "LCP" }, - { IPCP, ipcp_init, ipcp_input, ipcp_protrej, ipcp_printpkt, NULL, "IPCP" }, - { UPAP, upap_init, upap_input, upap_protrej, upap_printpkt, NULL, "PAP" }, - { CHAP, ChapInit, ChapInput, ChapProtocolReject, ChapPrintPkt, NULL, "CHAP" }, - { CCP, ccp_init, ccp_input, ccp_protrej, ccp_printpkt, ccp_datainput, "CCP" }, + { PPP_LCP, lcp_init, lcp_input, lcp_protrej, + lcp_printpkt, NULL, "LCP" }, + { PPP_IPCP, ipcp_init, ipcp_input, ipcp_protrej, + ipcp_printpkt, NULL, "IPCP" }, + { PPP_PAP, upap_init, upap_input, upap_protrej, + upap_printpkt, NULL, "PAP" }, + { PPP_CHAP, ChapInit, ChapInput, ChapProtocolReject, + ChapPrintPkt, NULL, "CHAP" }, + { PPP_CCP, ccp_init, ccp_input, ccp_protrej, + ccp_printpkt, ccp_datainput, "CCP" }, }; #define N_PROTO (sizeof(prottbl) / sizeof(prottbl[0])) @@ -141,7 +143,7 @@ main(argc, argv) int argc; char *argv[]; { - int i, nonblock; + int i, nonblock, fdflags; struct sigaction sa; struct cmd *cmdp; FILE *pidfile; @@ -153,6 +155,7 @@ main(argc, argv) p = ttyname(0); if (p) strcpy(devnam, p); + strcpy(default_devnam, devnam); if (gethostname(hostname, MAXNAMELEN) < 0 ) { perror("couldn't get hostname"); @@ -163,7 +166,7 @@ main(argc, argv) uid = getuid(); if (!ppp_available()) { - fprintf(stderr, "Sorry - PPP is not available on this system\n"); + fprintf(stderr, no_ppp_msg); exit(1); } @@ -185,6 +188,13 @@ main(argc, argv) 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. */ @@ -210,12 +220,6 @@ main(argc, argv) } 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 @@ -243,8 +247,47 @@ main(argc, argv) 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. @@ -266,13 +309,11 @@ main(argc, argv) syslog(LOG_ERR, "Failed to open %s: %m", devnam); die(1); } - if ((initfdflags = fcntl(fd, F_GETFL)) == -1) { - syslog(LOG_ERR, "Couldn't get device fd flags: %m"); - die(1); - } if (nonblock) { - initfdflags &= ~O_NONBLOCK; - fcntl(fd, F_SETFL, initfdflags); + if ((fdflags = fcntl(fd, F_GETFL)) == -1 + || fcntl(fd, F_SETFL, fdflags & ~O_NONBLOCK) < 0) + syslog(LOG_WARNING, + "Couldn't reset non-blocking mode on device: %m"); } hungup = 0; kill_link = 0; @@ -297,10 +338,10 @@ main(argc, argv) 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); @@ -311,7 +352,7 @@ main(argc, argv) (void) sprintf(ifname, "ppp%d", ifunit); /* write pid to file */ - (void) sprintf(pidfilename, "%s/%s.pid", pidpath, ifname); + (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname); if ((pidfile = fopen(pidfilename, "w")) != NULL) { fprintf(pidfile, "%d\n", pid); (void) fclose(pidfile); @@ -320,14 +361,6 @@ main(argc, argv) pidfilename[0] = 0; } - /* - * Set device for non-blocking reads. - */ - if (fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) { - syslog(LOG_ERR, "Couldn't set device to non-blocking mode: %m"); - die(1); - } - /* * Block all signals, start opening the connection, and wait for * incoming events (reply, timeout, etc.). @@ -338,6 +371,7 @@ main(argc, argv) for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) { wait_input(timeleft(&timo)); calltimeout(); + get_input(); if (kill_link) { lcp_close(0); kill_link = 0; @@ -349,20 +383,21 @@ main(argc, argv) } 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. + * XXX we may not be able to do this if the line has hung up! */ + 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(); @@ -372,10 +407,7 @@ main(argc, argv) } while (persist); - if (lockflag && !default_device) - unlock(); - - exit(0); + die(0); } @@ -389,62 +421,59 @@ get_input() 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 */ + link_terminated(0); + return; + } - if (debug /*&& (debugflags & DBG_INPACKET)*/) - log_packet(p, len, "rcvd "); + if (debug /*&& (debugflags & DBG_INPACKET)*/) + log_packet(p, len, "rcvd "); - if (len < DLLHEADERLEN) { - 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 -= DLLHEADERLEN; + p += 2; /* Skip address and control */ + GETSHORT(protocol, p); + len -= PPP_HDRLEN; - /* - * Toss all non-LCP packets unless LCP is OPEN. - */ - if (protocol != 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 - DLLHEADERLEN, len + DLLHEADERLEN); + 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); } @@ -467,19 +496,18 @@ demuxprotrej(unit, protocol) return; } - syslog(LOG_WARNING, - "demuxprotrej: Unrecognized Protocol-Reject for protocol 0x%x", + syslog(LOG_WARNING, "Unrecognized Protocol-Reject for protocol 0x%x", protocol); } /* - * quit - Clean up state and exit. + * quit - Clean up state and exit (with an error indication). */ void quit() { - die(0); + die(1); } /* @@ -489,7 +517,7 @@ void die(status) int status; { - cleanup(0, NULL); + cleanup(); syslog(LOG_INFO, "Exit."); exit(status); } @@ -498,11 +526,11 @@ die(status) * cleanup - restore anything which needs to be restored before we exit */ /* ARGSUSED */ -void -cleanup(status, arg) - int status; - caddr_t arg; +static void +cleanup() { + sys_cleanup(); + if (fd >= 0) close_fd(); @@ -517,19 +545,15 @@ cleanup(status, arg) /* * close_fd - restore the terminal device and close it. */ -void +static void close_fd() { + disestablish_ppp(); + /* drop dtr to hang up */ if (modem) setdtr(fd, FALSE); - if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0) - syslog(LOG_WARNING, "Couldn't restore device fd flags: %m"); - initfdflags = -1; - - disestablish_ppp(); - restore_tty(); close(fd); @@ -561,8 +585,8 @@ timeout(func, arg, time) { 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. @@ -581,9 +605,9 @@ timeout(func, arg, time) * 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; @@ -602,7 +626,7 @@ untimeout(func, arg) 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. @@ -619,7 +643,7 @@ untimeout(func, arg) /* * calltimeout - Call any timeout routines which are now due. */ -void +static void calltimeout() { struct callout *p; @@ -647,7 +671,7 @@ calltimeout() /* * timeleft - return the length of time until the next timeout is due. */ -struct timeval * +static struct timeval * timeleft(tvp) struct timeval *tvp; { @@ -741,23 +765,30 @@ open_ccp(sig) } +/* + * 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); +} + + /* * device_script - run a program to connect or disconnect the * serial device. */ -int +static int device_script(program, in, out) char *program; int in, out; { int pid; int status; - sigset_t mask; - - sigemptyset(&mask); - sigaddset(&mask, SIGINT); - sigaddset(&mask, SIGHUP); - sigprocmask(SIG_BLOCK, &mask, &mask); + int errfd; pid = fork(); @@ -767,11 +798,13 @@ device_script(program, in, out) } 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); @@ -784,7 +817,6 @@ device_script(program, in, out) syslog(LOG_ERR, "error waiting for (dis)connection process: %m"); die(1); } - sigprocmask(SIG_SETMASK, &mask, NULL); return (status == 0 ? 0 : -1); } @@ -803,6 +835,7 @@ run_program(prog, args, must_exist) int must_exist; { int pid; + char *nullenv[1]; pid = fork(); if (pid == -1) { @@ -810,20 +843,22 @@ run_program(prog, args, must_exist) 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) { @@ -835,14 +870,17 @@ run_program(prog, args, must_exist) 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); @@ -857,7 +895,7 @@ run_program(prog, args, must_exist) * reap_kids - get status from any dead child processes, * and log a message for abnormal terminations. */ -void +static void reap_kids() { int pid, status; @@ -907,17 +945,17 @@ void format_packet(p, len, printer, arg) u_char *p; int len; - void (*printer) __ARGS((void *, char *, ...)); + void (*printer) __P((void *, char *, ...)); void *arg; { int i, n; u_short proto; u_char x; - if (len >= DLLHEADERLEN && p[0] == ALLSTATIONS && p[1] == UI) { + if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) { p += 2; GETSHORT(proto, p); - len -= DLLHEADERLEN; + len -= PPP_HDRLEN; for (i = 0; i < N_PROTO; ++i) if (proto == prottbl[i].protocol) break; @@ -941,7 +979,7 @@ format_packet(p, len, printer, arg) #ifdef __STDC__ #include -void +static void pr_log(void *arg, char *fmt, ...) { int n; @@ -964,7 +1002,7 @@ pr_log(void *arg, char *fmt, ...) #else /* __STDC__ */ #include -void +static void pr_log(arg, fmt, va_alist) void *arg; char *fmt; @@ -996,7 +1034,7 @@ void print_string(p, len, printer, arg) char *p; int len; - void (*printer) __ARGS((void *, char *, ...)); + void (*printer) __P((void *, char *, ...)); void *arg; { int c;