X-Git-Url: http://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=pppd%2Fmain.c;h=c618a2616f600367aa134b59e33086f07b071bdc;hp=ed73a12b0b9ccad87116fd3fc5940b8359e8cdde;hb=768532f702f8af685d29ed278f352e1c79141112;hpb=8770e3b90ea3f4b2283fcda7a8339b6698381e3f diff --git a/pppd/main.c b/pppd/main.c index ed73a12..c618a26 100644 --- a/pppd/main.c +++ b/pppd/main.c @@ -18,7 +18,7 @@ */ #ifndef lint -static char rcsid[] = "$Id: main.c,v 1.42 1997/07/14 03:53:25 paulus Exp $"; +static char rcsid[] = "$Id: main.c,v 1.70 1999/03/31 05:39:42 paulus Exp $"; #endif #include @@ -33,6 +33,7 @@ static char rcsid[] = "$Id: main.c,v 1.42 1997/07/14 03:53:25 paulus Exp $"; #include #include #include +#include #include #include #include @@ -40,7 +41,7 @@ static char rcsid[] = "$Id: main.c,v 1.42 1997/07/14 03:53:25 paulus Exp $"; #include #include #include -#include +#include #include "pppd.h" #include "magic.h" @@ -69,40 +70,65 @@ extern char *strerror(); #endif /* interface vars */ -char ifname[IFNAMSIZ]; /* Interface name */ +char ifname[32]; /* Interface name */ int ifunit; /* Interface unit number */ char *progname; /* Name of this program */ char hostname[MAXNAMELEN]; /* Our hostname */ static char pidfilename[MAXPATHLEN]; /* name of pid file */ -static char default_devnam[MAXPATHLEN]; /* name of default device */ +static char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */ static pid_t pid; /* Our pid */ static uid_t uid; /* Our real user-id */ static int conn_running; /* we have a [dis]connector running */ -int ttyfd = -1; /* Serial port file descriptor */ +int ttyfd; /* Serial port file descriptor */ mode_t tty_mode = -1; /* Original access permissions to tty */ int baud_rate; /* Actual bits/second for serial device */ int hungup; /* terminal has been hung up */ int privileged; /* we're running as real uid root */ int need_holdoff; /* need holdoff period before restarting */ +int detached; /* have detached from terminal */ +int log_to_fd; /* send log messages to this fd too */ + +static int fd_ppp = -1; /* fd for talking PPP */ +static int fd_loop; /* fd for getting demand-dial packets */ +static int pty_master; /* fd for master side of pty */ +static int pty_slave; /* fd for slave side of pty */ +static int real_ttyfd; /* fd for actual serial port (not pty) */ int phase; /* where the link is at */ int kill_link; int open_ccp_flag; -int redirect_stderr; /* Connector's stderr should go to file */ + +static int waiting; +static sigjmp_buf sigjmp; + +char **script_env; /* Env. variable values for scripts */ +int s_env_nalloc; /* # words avail at script_env */ u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */ u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */ static int n_children; /* # child processes still running */ +static int got_sigchld; /* set if we have received a SIGCHLD */ static int locked; /* lock() has succeeded */ char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n"; +GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */ +int ngroups; /* How many groups valid in groups */ + +static struct timeval start_time; /* Time when link was started. */ + +struct pppd_stats link_stats; +int link_stats_valid; + +static int charshunt_pid; /* Process ID for charshunt */ + /* Prototypes for procedures local to this file. */ +static void create_pidfile __P((void)); static void cleanup __P((void)); static void close_tty __P((void)); static void get_input __P((void)); @@ -116,9 +142,19 @@ static void toggle_debug __P((int)); static void open_ccp __P((int)); static void bad_signal __P((int)); static void holdoff_end __P((void *)); -static int device_script __P((char *, int, int)); -static void reap_kids __P((void)); +static int device_script __P((char *, int, int, int)); +static void reap_kids __P((int waitfor)); static void pr_log __P((void *, char *, ...)); +static void logit __P((int, char *, va_list)); +static void vslp_printer __P((void *, char *, ...)); +static void format_packet __P((u_char *, int, void (*) (void *, char *, ...), + void *)); +static void record_child __P((int, char *, void (*) (void *), void *)); +static int start_charshunt __P((int, int)); +static void charshunt_done __P((void *)); +static void charshunt __P((int, int, char *)); +static int record_write(FILE *, int code, u_char *buf, int nb, + struct timeval *); extern char *ttyname __P((int)); extern char *getlogin __P((void)); @@ -161,38 +197,37 @@ main(argc, argv) int argc; char *argv[]; { - int i, nonblock, fdflags; + int i, fdflags; struct sigaction sa; - FILE *pidfile; char *p; struct passwd *pw; struct timeval timo; sigset_t mask; struct protent *protp; struct stat statbuf; + char numbuf[16]; + struct timeval now; phase = PHASE_INITIALIZE; - p = ttyname(0); - if (p) - strcpy(devnam, p); - strcpy(default_devnam, devnam); + log_to_fd = -1; + + script_env = NULL; /* Initialize syslog facilities */ -#ifdef ULTRIX - openlog("pppd", LOG_PID); -#else - openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP); - setlogmask(LOG_UPTO(LOG_INFO)); -#endif + reopen_log(); if (gethostname(hostname, MAXNAMELEN) < 0 ) { option_error("Couldn't get hostname: %m"); - die(1); + exit(1); } hostname[MAXNAMELEN-1] = 0; uid = getuid(); privileged = uid == 0; + slprintf(numbuf, sizeof(numbuf), "%d", uid); + script_setenv("ORIG_UID", numbuf); + + ngroups = getgroups(NGROUPS_MAX, groups); /* * Initialize to the standard option set, then parse, in order, @@ -201,13 +236,31 @@ main(argc, argv) */ for (i = 0; (protp = protocols[i]) != NULL; ++i) (*protp->init)(0); - + progname = *argv; if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1) || !options_from_user()) exit(1); + using_pty = notty || ptycommand != NULL; scan_args(argc-1, argv+1); /* look for tty name on command line */ + + /* + * Work out the device name, if it hasn't already been specified. + */ + if (!using_pty) { + p = isatty(0)? ttyname(0): NULL; + if (p != NULL) { + if (default_device) + strlcpy(devnam, p, sizeof(devnam)); + else if (strcmp(devnam, p) == 0) + default_device = 1; + } + } + + /* + * Parse the tty options file and the command line. + */ if (!options_for_tty() || !parse_args(argc-1, argv+1)) exit(1); @@ -218,7 +271,7 @@ main(argc, argv) if (geteuid() != 0) { option_error("must be root to run %s, since it is not setuid-root", argv[0]); - die(1); + exit(1); } if (!ppp_available()) { @@ -229,23 +282,42 @@ main(argc, argv) /* * Check that the options given are valid and consistent. */ - sys_check_options(); + if (!sys_check_options()) + exit(1); auth_check_options(); for (i = 0; (protp = protocols[i]) != NULL; ++i) if (protp->check_options != NULL) (*protp->check_options)(); if (demand && connector == 0) { - option_error("connect script required for demand-dialling\n"); + option_error("connect script is required for demand-dialling\n"); exit(1); } - /* - * 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; - redirect_stderr = !nodetach || default_device; + if (using_pty) { + if (!default_device) { + option_error("%s option precludes specifying device name", + notty? "notty": "pty"); + exit(1); + } + if (ptycommand != NULL && notty) { + option_error("pty option is incompatible with notty option"); + exit(1); + } + default_device = notty; + lockflag = 0; + modem = 0; + } else { + if (devnam[0] == 0) { + option_error("no device specified and stdin is not a tty"); + exit(1); + } + } + if (default_device) + nodetach = 1; + else + log_to_fd = 1; /* default to stdout */ + + script_setenv("DEVICE", devnam); /* * Initialize system-dependent stuff and magic number package. @@ -259,10 +331,8 @@ main(argc, argv) * Detach ourselves from the terminal, if required, * and identify who is running us. */ - if (!default_device && !nodetach && daemon(0, 0) < 0) { - perror("Couldn't detach from controlling terminal"); - exit(1); - } + if (!nodetach && !updetach) + detach(); pid = getpid(); p = getlogin(); if (p == NULL) { @@ -285,14 +355,13 @@ main(argc, argv) sigaddset(&mask, SIGINT); sigaddset(&mask, SIGTERM); sigaddset(&mask, SIGCHLD); + sigaddset(&mask, SIGUSR2); -#define SIGNAL(s, handler) { \ +#define SIGNAL(s, handler) do { \ sa.sa_handler = handler; \ - if (sigaction(s, &sa, NULL) < 0) { \ - syslog(LOG_ERR, "Couldn't establish signal handler (%d): %m", s); \ - die(1); \ - } \ - } + if (sigaction(s, &sa, NULL) < 0) \ + fatal("Couldn't establish signal handler (%d): %m", s); \ + } while (0) sa.sa_mask = mask; sa.sa_flags = 0; @@ -350,6 +419,8 @@ main(argc, argv) */ signal(SIGPIPE, SIG_IGN); + waiting = 0; + /* * If we're doing dial-on-demand, set up the interface now. */ @@ -357,20 +428,13 @@ main(argc, argv) /* * Open the loopback channel and set it up to be the ppp interface. */ - open_ppp_loopback(); + fd_loop = open_ppp_loopback(); syslog(LOG_INFO, "Using interface ppp%d", ifunit); - (void) sprintf(ifname, "ppp%d", ifunit); + slprintf(ifname, sizeof(ifname), "ppp%d", ifunit); + script_setenv("IFNAME", ifname); - /* write pid to file */ - (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname); - if ((pidfile = fopen(pidfilename, "w")) != NULL) { - fprintf(pidfile, "%d\n", pid); - (void) fclose(pidfile); - } else { - syslog(LOG_ERR, "Failed to create pid file %s: %m", pidfilename); - pidfilename[0] = 0; - } + create_pidfile(); /* write pid to file */ /* * Configure the interface and mark it up, etc. @@ -381,32 +445,64 @@ main(argc, argv) for (;;) { need_holdoff = 1; + ttyfd = -1; + real_ttyfd = -1; if (demand) { /* * Don't do anything until we see some activity. */ - phase = PHASE_DORMANT; kill_link = 0; + phase = PHASE_DORMANT; demand_unblock(); + add_fd(fd_loop); for (;;) { - wait_loop_output(timeleft(&timo)); + if (sigsetjmp(sigjmp, 1) == 0) { + sigprocmask(SIG_BLOCK, &mask, NULL); + if (kill_link) { + sigprocmask(SIG_UNBLOCK, &mask, NULL); + } else { + waiting = 1; + sigprocmask(SIG_UNBLOCK, &mask, NULL); + wait_input(timeleft(&timo)); + } + } + waiting = 0; calltimeout(); if (kill_link) { if (!persist) - die(0); + break; kill_link = 0; } if (get_loop_output()) break; - reap_kids(); + if (got_sigchld) + reap_kids(0); } + remove_fd(fd_loop); + if (kill_link && !persist) + break; /* * Now we want to bring up the link. */ demand_block(); - syslog(LOG_INFO, "Starting link"); + info("Starting link"); + } + + /* + * Get a pty master/slave pair if the pty, notty, or record + * options were specified. + */ + strlcpy(ppp_devnam, devnam, sizeof(ppp_devnam)); + pty_master = -1; + pty_slave = -1; + if (ptycommand != NULL || notty || record_file != NULL) { + if (!get_pty(&pty_master, &pty_slave, ppp_devnam, uid)) { + error("Couldn't allocate pseudo-tty"); + goto fail; + } + set_up_tty(pty_slave, 1); } /* @@ -425,105 +521,180 @@ main(argc, argv) * out and we want to use the modem lines, we reopen it later * in order to wait for the carrier detect signal from the modem. */ - while ((ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0)) < 0) { - if (errno != EINTR) - syslog(LOG_ERR, "Failed to open %s: %m", devnam); - if (!persist || errno != EINTR) - goto fail; - } - if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1 - || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0) - syslog(LOG_WARNING, - "Couldn't reset non-blocking mode on device: %m"); - hungup = 0; kill_link = 0; + if (devnam[0] != 0) { + for (;;) { + /* If the user specified the device name, become the + user before opening it. */ + if (!devnam_info.priv && !default_device) + seteuid(uid); + ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0); + if (!devnam_info.priv && !default_device) + seteuid(0); + if (ttyfd >= 0) + break; + if (errno != EINTR) + error("Failed to open %s: %m", devnam); + if (!persist || errno != EINTR) + goto fail; + } + if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1 + || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0) + warn("Couldn't reset non-blocking mode on device: %m"); - /* - * Do the equivalent of `mesg n' to stop broadcast messages. - */ - if (fstat(ttyfd, &statbuf) < 0 - || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) { - syslog(LOG_WARNING, - "Couldn't restrict write permissions to %s: %m", devnam); - } else - tty_mode = statbuf.st_mode; + /* + * Do the equivalent of `mesg n' to stop broadcast messages. + */ + if (fstat(ttyfd, &statbuf) < 0 + || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) { + warn("Couldn't restrict write permissions to %s: %m", devnam); + } else + tty_mode = statbuf.st_mode; + + /* + * Set line speed, flow control, etc. + * If we have a non-null connection script, + * on most systems we set CLOCAL for now so that we can talk + * to the modem before carrier comes up. But this has the + * side effect that we might miss it if CD drops before we + * get to clear CLOCAL below. On systems where we can talk + * successfully to the modem with CLOCAL clear and CD down, + * we could clear CLOCAL at this point. + */ + set_up_tty(ttyfd, (connector != NULL && connector[0] != 0)); + real_ttyfd = ttyfd; + } /* - * Set line speed, flow control, etc. - * Previously, if we had a connection script, we would set CLOCAL - * while the script was running. But then, if CD was negated - * before the script finished, we would miss it. + * If the notty and/or record option was specified, + * start up the character shunt now. */ - set_up_tty(ttyfd, 0); + if (ptycommand != NULL) { + if (record_file != NULL) { + int ipipe[2], opipe[2], ok; + + if (pipe(ipipe) < 0 || pipe(opipe) < 0) + fatal("Couldn't create pipes for record option: %m"); + ok = device_script(ptycommand, opipe[0], ipipe[1], 1) == 0 + && start_charshunt(ipipe[0], opipe[1]); + close(ipipe[0]); + close(ipipe[1]); + close(opipe[0]); + close(opipe[1]); + if (!ok) + goto fail; + } else { + if (device_script(ptycommand, pty_master, pty_master, 1) < 0) + goto fail; + ttyfd = pty_slave; + close(pty_master); + pty_master = -1; + } + } else if (notty) { + if (!start_charshunt(0, 1)) + goto fail; + } else if (record_file != NULL) { + if (!start_charshunt(ttyfd, ttyfd)) + goto fail; + } /* run connection script */ if (connector && connector[0]) { - MAINDEBUG((LOG_INFO, "Connecting with <%s>", connector)); + MAINDEBUG(("Connecting with <%s>", connector)); - /* drop dtr to hang up in case modem is off hook */ - if (!default_device && modem) { - setdtr(ttyfd, FALSE); - sleep(1); - setdtr(ttyfd, TRUE); + if (real_ttyfd != -1) { + if (!default_device && modem) { + setdtr(real_ttyfd, 0); /* in case modem is off hook */ + sleep(1); + setdtr(real_ttyfd, 1); + } } - if (device_script(connector, ttyfd, ttyfd) < 0) { - syslog(LOG_ERR, "Connect script failed"); - setdtr(ttyfd, FALSE); + if (device_script(connector, ttyfd, ttyfd, 0) < 0) { + error("Connect script failed"); goto fail; } - syslog(LOG_INFO, "Serial connection established."); - sleep(1); /* give it time to set up its terminal */ + info("Serial connection established."); + + /* set line speed, flow control, etc.; + clear CLOCAL if modem option */ + if (real_ttyfd != -1) + set_up_tty(real_ttyfd, 0); } /* reopen tty if necessary to wait for carrier */ - if (connector == NULL && modem) { - while ((i = open(devnam, O_RDWR)) < 0) { + if (connector == NULL && modem && devnam[0] != 0) { + for (;;) { + if ((i = open(devnam, O_RDWR)) >= 0) + break; if (errno != EINTR) - syslog(LOG_ERR, "Failed to reopen %s: %m", devnam); + error("Failed to reopen %s: %m", devnam); if (!persist || errno != EINTR || hungup || kill_link) goto fail; } close(i); } + slprintf(numbuf, sizeof(numbuf), "%d", baud_rate); + script_setenv("SPEED", numbuf); + /* run welcome script, if any */ if (welcomer && welcomer[0]) { - if (device_script(welcomer, ttyfd, ttyfd) < 0) - syslog(LOG_WARNING, "Welcome script failed"); + if (device_script(welcomer, ttyfd, ttyfd, 0) < 0) + warn("Welcome script failed"); } /* set up the serial device as a ppp interface */ - establish_ppp(ttyfd); + fd_ppp = establish_ppp(ttyfd); + if (fd_ppp < 0) + goto fail; if (!demand) { - syslog(LOG_INFO, "Using interface ppp%d", ifunit); - (void) sprintf(ifname, "ppp%d", ifunit); - - /* write pid to file */ - (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname); - if ((pidfile = fopen(pidfilename, "w")) != NULL) { - fprintf(pidfile, "%d\n", pid); - (void) fclose(pidfile); - } else { - syslog(LOG_ERR, "Failed to create pid file %s: %m", - pidfilename); - pidfilename[0] = 0; - } + info("Using interface ppp%d", ifunit); + slprintf(ifname, sizeof(ifname), "ppp%d", ifunit); + script_setenv("IFNAME", ifname); + + create_pidfile(); /* write pid to file */ } /* * Start opening the connection and wait for * incoming events (reply, timeout, etc.). */ - syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devnam); + notice("Connect: %s <--> %s", ifname, ppp_devnam); + gettimeofday(&start_time, NULL); lcp_lowerup(0); + + /* + * If we are initiating this connection, wait for a short + * time for something from the peer. This can avoid bouncing + * our packets off his tty before he has it set up. + */ + if (connector != NULL || ptycommand != NULL) { + struct timeval t; + t.tv_sec = 1; + t.tv_usec = 0; + wait_input(&t); + } + lcp_open(0); /* Start protocol */ + open_ccp_flag = 0; + add_fd(fd_ppp); for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) { - wait_input(timeleft(&timo)); + if (sigsetjmp(sigjmp, 1) == 0) { + sigprocmask(SIG_BLOCK, &mask, NULL); + if (kill_link || open_ccp_flag) { + sigprocmask(SIG_UNBLOCK, &mask, NULL); + } else { + waiting = 1; + sigprocmask(SIG_UNBLOCK, &mask, NULL); + wait_input(timeleft(&timo)); + } + } + waiting = 0; calltimeout(); get_input(); if (kill_link) { @@ -537,7 +708,21 @@ main(argc, argv) } open_ccp_flag = 0; } - reap_kids(); /* Don't leave dead kids lying around */ + if (got_sigchld) + reap_kids(0); /* Don't leave dead kids lying around */ + } + + /* + * Print connect time and statistics. + */ + if (gettimeofday(&now, NULL) >= 0) { + int t = now.tv_sec - start_time.tv_sec; + t = (t + 5) / 6; /* now in 1/10ths of minutes */ + info("Connect time %d.%d minutes.", t/10, t%10); + } + if (link_stats_valid) { + info("Sent %d bytes, received %d bytes.", + link_stats.bytes_out, link_stats.bytes_in); } /* @@ -545,26 +730,35 @@ main(argc, argv) * the ppp unit back to the loopback. Set the * real serial device back to its normal mode of operation. */ + remove_fd(fd_ppp); clean_check(); if (demand) restore_loop(); disestablish_ppp(ttyfd); + fd_ppp = -1; /* * Run disconnector script, if requested. * XXX we may not be able to do this if the line has hung up! */ if (disconnector && !hungup) { - set_up_tty(ttyfd, 1); - if (device_script(disconnector, ttyfd, ttyfd) < 0) { - syslog(LOG_WARNING, "disconnect script failed"); + if (real_ttyfd >= 0) + set_up_tty(real_ttyfd, 1); + if (device_script(disconnector, ttyfd, ttyfd, 0) < 0) { + warn("disconnect script failed"); } else { - syslog(LOG_INFO, "Serial link disconnected."); + info("Serial link disconnected."); } } + if (!hungup) + lcp_lowerdown(0); fail: - if (ttyfd >= 0) + if (pty_master >= 0) + close(pty_master); + if (pty_slave >= 0) + close(pty_slave); + if (real_ttyfd >= 0) close_tty(); if (locked) { unlock(); @@ -574,36 +768,108 @@ main(argc, argv) if (!demand) { if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT) - syslog(LOG_WARNING, "unable to delete pid file: %m"); + warn("unable to delete pid file: %m"); pidfilename[0] = 0; } if (!persist) break; + kill_link = 0; if (demand) demand_discard(); if (holdoff > 0 && need_holdoff) { phase = PHASE_HOLDOFF; TIMEOUT(holdoff_end, NULL, holdoff); do { - wait_time(timeleft(&timo)); + if (sigsetjmp(sigjmp, 1) == 0) { + sigprocmask(SIG_BLOCK, &mask, NULL); + if (kill_link) { + sigprocmask(SIG_UNBLOCK, &mask, NULL); + } else { + waiting = 1; + sigprocmask(SIG_UNBLOCK, &mask, NULL); + wait_input(timeleft(&timo)); + } + } + waiting = 0; calltimeout(); if (kill_link) { - if (!persist) - die(0); kill_link = 0; phase = PHASE_DORMANT; /* allow signal to end holdoff */ } - reap_kids(); + if (got_sigchld) + reap_kids(0); } while (phase == PHASE_HOLDOFF); + if (!persist) + break; } } + /* Wait for scripts to finish */ + while (n_children > 0) + reap_kids(1); + die(0); return 0; } +/* + * detach - detach us from the controlling terminal. + */ +void +detach() +{ + if (detached) + return; + if (daemon(0, 0) < 0) { + perror("Couldn't detach from controlling terminal"); + die(1); + } + detached = 1; + log_to_fd = -1; + pid = getpid(); + /* update pid file if it has been written already */ + if (pidfilename[0]) + create_pidfile(); +} + +/* + * reopen_log - (re)open our connection to syslog. + */ +void +reopen_log() +{ +#ifdef ULTRIX + openlog("pppd", LOG_PID); +#else + openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP); + setlogmask(LOG_UPTO(LOG_INFO)); +#endif +} + +/* + * Create a file containing our process ID. + */ +static void +create_pidfile() +{ + FILE *pidfile; + char numbuf[16]; + + slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid", + _PATH_VARRUN, ifname); + if ((pidfile = fopen(pidfilename, "w")) != NULL) { + fprintf(pidfile, "%d\n", pid); + (void) fclose(pidfile); + } else { + error("Failed to create pid file %s: %m", pidfilename); + pidfilename[0] = 0; + } + slprintf(numbuf, sizeof(numbuf), "%d", pid); + script_setenv("PPPD_PID", numbuf); +} + /* * holdoff_end - called via a timeout when the holdoff period ends. */ @@ -632,7 +898,7 @@ get_input() return; if (len == 0) { - syslog(LOG_NOTICE, "Modem hangup"); + notice("Modem hangup"); hungup = 1; lcp_lowerdown(0); /* serial link is no longer available */ link_terminated(0); @@ -640,10 +906,10 @@ get_input() } if (debug /*&& (debugflags & DBG_INPACKET)*/) - log_packet(p, len, "rcvd ", LOG_DEBUG); + dbglog("rcvd %P", p, len); if (len < PPP_HDRLEN) { - MAINDEBUG((LOG_INFO, "io(): Received short packet.")); + MAINDEBUG(("io(): Received short packet.")); return; } @@ -655,8 +921,7 @@ get_input() * Toss all non-LCP packets unless LCP is OPEN. */ if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) { - MAINDEBUG((LOG_INFO, - "get_input: Received non-LCP packet when LCP not open.")); + MAINDEBUG(("get_input: Received non-LCP packet when LCP not open.")); return; } @@ -667,7 +932,7 @@ get_input() if (phase <= PHASE_AUTHENTICATE && !(protocol == PPP_LCP || protocol == PPP_LQR || protocol == PPP_PAP || protocol == PPP_CHAP)) { - MAINDEBUG((LOG_INFO, "get_input: discarding proto 0x%x in phase %d", + MAINDEBUG(("get_input: discarding proto 0x%x in phase %d", protocol, phase)); return; } @@ -688,22 +953,13 @@ get_input() } if (debug) - syslog(LOG_WARNING, "Unsupported protocol (0x%x) received", protocol); + warn("Unsupported protocol (0x%x) received", protocol); lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN); } /* - * quit - Clean up state and exit (with an error indication). - */ -void -quit() -{ - die(1); -} - -/* - * die - like quit, except we can specify an exit status. + * die - clean up state and exit with the specified status. */ void die(status) @@ -723,11 +979,13 @@ cleanup() { sys_cleanup(); - if (ttyfd >= 0) + if (fd_ppp >= 0) + disestablish_ppp(ttyfd); + if (real_ttyfd >= 0) close_tty(); if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT) - syslog(LOG_WARNING, "unable to delete pid file: %m"); + warn("unable to delete pid file: %m"); pidfilename[0] = 0; if (locked) @@ -740,11 +998,9 @@ cleanup() static void close_tty() { - disestablish_ppp(ttyfd); - /* drop dtr to hang up */ - if (modem) { - setdtr(ttyfd, FALSE); + if (!default_device && modem) { + setdtr(real_ttyfd, 0); /* * This sleep is in case the serial port has CLOCAL set by default, * and consequently will reassert DTR when we close the device. @@ -752,13 +1008,17 @@ close_tty() sleep(1); } - restore_tty(ttyfd); + restore_tty(real_ttyfd); - if (tty_mode != (mode_t) -1) - chmod(devnam, tty_mode); + if (tty_mode != (mode_t) -1) { + if (fchmod(real_ttyfd, tty_mode) != 0) { + /* XXX if devnam is a symlink, this will change the link */ + chmod(devnam, tty_mode); + } + } - close(ttyfd); - ttyfd = -1; + close(real_ttyfd); + real_ttyfd = -1; } @@ -786,16 +1046,13 @@ timeout(func, arg, time) { struct callout *newp, *p, **pp; - MAINDEBUG((LOG_DEBUG, "Timeout %lx:%lx in %d seconds.", - (long) func, (long) arg, time)); + MAINDEBUG(("Timeout %p:%p in %d seconds.", func, arg, time)); /* * Allocate timeout. */ - if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) { - syslog(LOG_ERR, "Out of memory in timeout()!"); - die(1); - } + if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) + fatal("Out of memory in timeout()!"); newp->c_arg = arg; newp->c_func = func; gettimeofday(&timenow, NULL); @@ -808,7 +1065,7 @@ timeout(func, arg, time) for (pp = &callout; (p = *pp); pp = &p->c_next) 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)) + && newp->c_time.tv_usec < p->c_time.tv_usec)) break; newp->c_next = p; *pp = newp; @@ -825,7 +1082,7 @@ untimeout(func, arg) { struct callout **copp, *freep; - MAINDEBUG((LOG_DEBUG, "Untimeout %lx:%lx.", (long) func, (long) arg)); + MAINDEBUG(("Untimeout %p:%p.", func, arg)); /* * Find first matching timeout and remove it from the list. @@ -850,10 +1107,8 @@ calltimeout() while (callout != NULL) { p = callout; - if (gettimeofday(&timenow, NULL) < 0) { - syslog(LOG_ERR, "Failed to get time of day: %m"); - die(1); - } + if (gettimeofday(&timenow, NULL) < 0) + fatal("Failed to get time of day: %m"); if (!(p->c_time.tv_sec < timenow.tv_sec || (p->c_time.tv_sec == timenow.tv_sec && p->c_time.tv_usec <= timenow.tv_usec))) @@ -919,11 +1174,15 @@ static void hup(sig) int sig; { - syslog(LOG_INFO, "Hangup (SIGHUP)"); + info("Hangup (SIGHUP)"); kill_link = 1; if (conn_running) /* Send the signal to the [dis]connector process(es) also */ kill_my_pg(sig); + if (charshunt_pid) + kill(charshunt_pid, sig); + if (waiting) + siglongjmp(sigjmp, 1); } @@ -937,24 +1196,30 @@ static void term(sig) int sig; { - syslog(LOG_INFO, "Terminating on signal %d.", sig); + info("Terminating on signal %d.", sig); persist = 0; /* don't try to restart */ kill_link = 1; if (conn_running) /* Send the signal to the [dis]connector process(es) also */ kill_my_pg(sig); + if (charshunt_pid) + kill(charshunt_pid, sig); + if (waiting) + siglongjmp(sigjmp, 1); } /* * chld - Catch SIGCHLD signal. - * Calls reap_kids to get status for any dead kids. + * Sets a flag so we will call reap_kids in the mainline. */ static void chld(sig) int sig; { - reap_kids(); + got_sigchld = 1; + if (waiting) + siglongjmp(sigjmp, 1); } @@ -988,6 +1253,8 @@ open_ccp(sig) int sig; { open_ccp_flag = 1; + if (waiting) + siglongjmp(sigjmp, 1); } @@ -998,112 +1265,173 @@ static void bad_signal(sig) int sig; { - syslog(LOG_ERR, "Fatal signal %d", sig); + static int crashed = 0; + + if (crashed) + _exit(127); + crashed = 1; + error("Fatal signal %d", sig); if (conn_running) kill_my_pg(SIGTERM); + if (charshunt_pid) + kill(charshunt_pid, SIGTERM); die(1); } /* - * device_script - run a program to connect or disconnect the - * serial device. + * device_script - run a program to talk to the serial device + * (e.g. to run the connector or disconnector script). */ static int -device_script(program, in, out) +device_script(program, in, out, dont_wait) char *program; int in, out; + int dont_wait; { int pid; - int status; + int status = 0; int errfd; - conn_running = 1; + ++conn_running; pid = fork(); if (pid < 0) { - conn_running = 0; - syslog(LOG_ERR, "Failed to create child process: %m"); - die(1); + --conn_running; + error("Failed to create child process: %m"); + return -1; } if (pid == 0) { sys_close(); closelog(); - if (in == out) { - if (in != 0) { - dup2(in, 0); - close(in); - } - dup2(0, 1); - } else { - if (out == 0) - out = dup(out); - if (in != 0) { - dup2(in, 0); - close(in); - } - if (out != 1) { - dup2(out, 1); - close(out); - } + if (in == 2) { + /* aargh!!! */ + int newin = dup(in); + if (in == out) + out = newin; + in = newin; + } else if (out == 2) { + out = dup(out); } - if (redirect_stderr) { + if (log_to_fd >= 0) { + if (log_to_fd != 2) + dup2(log_to_fd, 2); + } else { close(2); - errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0644); + errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600); if (errfd >= 0 && errfd != 2) { dup2(errfd, 2); close(errfd); } } - setuid(getuid()); + if (in != 0) { + if (out == 0) + out = dup(out); + dup2(in, 0); + if (in > 2) + close(in); + } + if (out != 1) { + dup2(out, 1); + if (out > 2) + close(out); + } + if (real_ttyfd > 2) + close(real_ttyfd); + if (pty_master > 2) + close(pty_master); + if (pty_slave > 2) + close(pty_slave); + setuid(uid); + if (getuid() != uid) { + error("setuid failed"); + exit(1); + } setgid(getgid()); execl("/bin/sh", "sh", "-c", program, (char *)0); - syslog(LOG_ERR, "could not exec /bin/sh: %m"); - _exit(99); + error("could not exec /bin/sh: %m"); + exit(99); /* NOTREACHED */ } - while (waitpid(pid, &status, 0) < 0) { - if (errno == EINTR) - continue; - syslog(LOG_ERR, "error waiting for (dis)connection process: %m"); - die(1); + if (dont_wait) { + record_child(pid, program, NULL, NULL); + } else { + while (waitpid(pid, &status, 0) < 0) { + if (errno == EINTR) + continue; + fatal("error waiting for (dis)connection process: %m"); + } + --conn_running; } - conn_running = 0; return (status == 0 ? 0 : -1); } +/* + * We maintain a list of child process pids and + * functions to call when they exit. + */ +struct subprocess { + pid_t pid; + char *prog; + void (*done) __P((void *)); + void *arg; + struct subprocess *next; +}; + +struct subprocess *children; + /* * run-program - execute a program with given arguments, * but don't wait for it. * If the program can't be executed, logs an error unless * must_exist is 0 and the program file doesn't exist. + * Returns -1 if it couldn't fork, 0 if the file doesn't exist + * or isn't an executable plain file, or the process ID of the child. + * If done != NULL, (*done)(arg) will be called later (within + * reap_kids) iff the return value is > 0. */ -int -run_program(prog, args, must_exist) +pid_t +run_program(prog, args, must_exist, done, arg) char *prog; char **args; int must_exist; + void (*done) __P((void *)); + void *arg; { int pid; - char *nullenv[1]; + struct stat sbuf; + + /* + * First check if the file exists and is executable. + * We don't use access() because that would use the + * real user-id, which might not be root, and the script + * might be accessible only to root. + */ + errno = EINVAL; + if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode) + || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) { + if (must_exist || errno != ENOENT) + warn("Can't execute %s: %m", prog); + return 0; + } pid = fork(); if (pid == -1) { - syslog(LOG_ERR, "Failed to create child process for %s: %m", prog); + error("Failed to create child process for %s: %m", prog); return -1; } if (pid == 0) { int new_fd; /* Leave the current location */ - (void) setsid(); /* No controlling tty. */ + (void) setsid(); /* No controlling tty. */ (void) umask (S_IRWXG|S_IRWXO); - (void) chdir ("/"); /* no current directory. */ - setuid(geteuid()); + (void) chdir ("/"); /* no current directory. */ + setuid(0); /* set real UID = root */ setgid(getegid()); /* Ensure that nothing of our device environment is inherited. */ @@ -1113,6 +1441,8 @@ run_program(prog, args, must_exist) close (1); close (2); close (ttyfd); /* tty interface to the ppp device */ + if (real_ttyfd >= 0) + close(real_ttyfd); /* Don't pass handles to the PPP device, even by accident. */ new_fd = open (_PATH_DEVNULL, O_RDWR); @@ -1128,21 +1458,57 @@ run_program(prog, args, must_exist) #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"); + warn("can't reset priority to 0: %m"); #endif /* SysV recommends a second fork at this point. */ - /* 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); + /* run the program */ + execve(prog, args, script_env); + if (must_exist || errno != ENOENT) { + /* have to reopen the log, there's nowhere else + for the message to go. */ + reopen_log(); + syslog(LOG_ERR, "Can't execute %s: %m", prog); + closelog(); + } _exit(-1); } - MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %d", prog, pid)); + + if (debug) + dbglog("Script %s started; pid = %d", prog, pid); + record_child(pid, prog, done, arg); + + return pid; +} + + +/* + * record_child - add a child process to the list for reap_kids + * to use. + */ +static void +record_child(pid, prog, done, arg) + int pid; + char *prog; + void (*done) __P((void *)); + void *arg; +{ + struct subprocess *chp; + ++n_children; - return 0; + + chp = (struct subprocess *) malloc(sizeof(struct subprocess)); + if (chp == NULL) { + warn("losing track of %s process", prog); + } else { + chp->pid = pid; + chp->prog = prog; + chp->done = done; + chp->arg = arg; + chp->next = children; + children = chp; + } } @@ -1151,24 +1517,32 @@ run_program(prog, args, must_exist) * and log a message for abnormal terminations. */ static void -reap_kids() +reap_kids(waitfor) + int waitfor; { int pid, status; + struct subprocess *chp, **prevp; + got_sigchld = 0; if (n_children == 0) return; - if ((pid = waitpid(-1, &status, WNOHANG)) == -1) { - if (errno != ECHILD) - syslog(LOG_ERR, "Error waiting for child process: %m"); - return; - } - if (pid > 0) { + while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1 + && pid != 0) { --n_children; + for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) + if (chp->pid == pid) + break; if (WIFSIGNALED(status)) { - syslog(LOG_WARNING, "Child process %d terminated with signal %d", - pid, WTERMSIG(status)); - } + warn("Child process %s (pid %d) terminated with signal %d", + (chp? chp->prog: "??"), pid, WTERMSIG(status)); + } else if (debug) + dbglog("process %d (%s) finished, status = 0x%x", + pid, (chp? chp->prog: "??"), status); + if (chp && chp->done) + (*chp->done)(chp->arg); } + if (pid == -1 && errno != ECHILD && errno != EINTR) + error("Error waiting for child process: %m"); } @@ -1186,7 +1560,7 @@ log_packet(p, len, prefix, level) char *prefix; int level; { - strcpy(line, prefix); + strlcpy(line, prefix, sizeof(line)); linep = line + strlen(line); format_packet(p, len, pr_log, NULL); if (linep != line) @@ -1197,7 +1571,7 @@ log_packet(p, len, prefix, level) * format_packet - make a readable representation of a packet, * calling `printer(arg, format, ...)' to output it. */ -void +static void format_packet(p, len, printer, arg) u_char *p; int len; @@ -1206,7 +1580,6 @@ format_packet(p, len, printer, arg) { int i, n; u_short proto; - u_char x; struct protent *protp; if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) { @@ -1223,14 +1596,25 @@ format_packet(p, len, printer, arg) p += n; len -= n; } else { - printer(arg, "[proto=0x%x]", proto); + for (i = 0; (protp = protocols[i]) != NULL; ++i) + if (proto == (protp->protocol & ~0x8000)) + break; + if (protp != 0 && protp->data_name != 0) { + printer(arg, "[%s data]", protp->data_name); + if (len > 8) + printer(arg, "%.8B ...", p); + else + printer(arg, "%.*B", len, p); + len = 0; + } else + printer(arg, "[proto=0x%x]", proto); } } - for (; len > 0; --len) { - GETCHAR(x, p); - printer(arg, " %.2x", x); - } + if (len > 32) + printer(arg, "%.32B ...", p); + else + printer(arg, "%.*B", len, p); } static void @@ -1250,18 +1634,50 @@ pr_log __V((void *arg, char *fmt, ...)) fmt = va_arg(pvar, char *); #endif - vsprintf(buf, fmt, pvar); + n = vslprintf(buf, sizeof(buf), fmt, pvar); va_end(pvar); - n = strlen(buf); if (linep + n + 1 > line + sizeof(line)) { syslog(LOG_DEBUG, "%s", line); linep = line; } - strcpy(linep, buf); + strlcpy(linep, buf, line + sizeof(line) - linep); linep += n; } +/* + * vslp_printer - used in processing a %P format + */ +struct buffer_info { + char *ptr; + int len; +}; + +static void +vslp_printer __V((void *arg, char *fmt, ...)) +{ + int n; + va_list pvar; + struct buffer_info *bi; + +#if __STDC__ + va_start(pvar, fmt); +#else + void *arg; + char *fmt; + va_start(pvar); + arg = va_arg(pvar, void *); + fmt = va_arg(pvar, char *); +#endif + + bi = (struct buffer_info *) arg; + n = vslprintf(bi->ptr, bi->len, fmt, pvar); + va_end(pvar); + + bi->ptr += n; + bi->len -= n; +} + /* * print_string - print a readable representation of a string using * printer. @@ -1308,19 +1724,19 @@ void novm(msg) char *msg; { - syslog(LOG_ERR, "Virtual memory exhausted allocating %s\n", msg); - die(1); + fatal("Virtual memory exhausted allocating %s\n", msg); } /* - * fmtmsg - format a message into a buffer. Like sprintf except we + * slprintf - format a message into a buffer. Like sprintf except we * also specify the length of the output buffer, and we handle - * %r (recursive format), %m (error message) and %I (IP address) formats. + * %r (recursive format), %m (error message), %v (visible string), + * %q (quoted string), %t (current time) and %I (IP address) formats. * Doesn't do floating-point formats. * Returns the number of chars put into buf. */ int -fmtmsg __V((char *buf, int buflen, char *fmt, ...)) +slprintf __V((char *buf, int buflen, char *fmt, ...)) { va_list args; int n; @@ -1336,18 +1752,18 @@ fmtmsg __V((char *buf, int buflen, char *fmt, ...)) buflen = va_arg(args, int); fmt = va_arg(args, char *); #endif - n = vfmtmsg(buf, buflen, fmt, args); + n = vslprintf(buf, buflen, fmt, args); va_end(args); return n; } /* - * vfmtmsg - like fmtmsg, takes a va_list instead of a list of args. + * vslprintf - like slprintf, takes a va_list instead of a list of args. */ #define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0) int -vfmtmsg(buf, buflen, fmt, args) +vslprintf(buf, buflen, fmt, args) char *buf; int buflen; char *fmt; @@ -1361,7 +1777,9 @@ vfmtmsg(buf, buflen, fmt, args) unsigned char *p; char num[32]; time_t t; + u_int32_t ip; static char hexchars[] = "0123456789abcdef"; + struct buffer_info bufinfo; buf0 = buf; --buflen; @@ -1426,6 +1844,7 @@ vfmtmsg(buf, buflen, fmt, args) base = 8; break; case 'x': + case 'X': val = va_arg(args, unsigned int); base = 16; break; @@ -1446,15 +1865,19 @@ vfmtmsg(buf, buflen, fmt, args) str = strerror(errno); break; case 'I': - str = ip_ntoa(va_arg(args, u_int32_t)); + ip = va_arg(args, u_int32_t); + ip = ntohl(ip); + slprintf(num, sizeof(num), "%d.%d.%d.%d", (ip >> 24) & 0xff, + (ip >> 16) & 0xff, (ip >> 8) & 0xff, ip & 0xff); + str = num; break; case 'r': f = va_arg(args, char *); #ifndef __powerpc__ - n = vfmtmsg(buf, buflen + 1, f, va_arg(args, va_list)); + n = vslprintf(buf, buflen + 1, f, va_arg(args, va_list)); #else /* On the powerpc, a va_list is an array of 1 structure */ - n = vfmtmsg(buf, buflen + 1, f, va_arg(args, void *)); + n = vslprintf(buf, buflen + 1, f, va_arg(args, void *)); #endif buf += n; buflen -= n; @@ -1511,6 +1934,25 @@ vfmtmsg(buf, buflen, fmt, args) OUTCHAR(c); } continue; + case 'P': /* print PPP packet */ + bufinfo.ptr = buf; + bufinfo.len = buflen + 1; + p = va_arg(args, unsigned char *); + n = va_arg(args, int); + format_packet(p, n, vslp_printer, &bufinfo); + buf = bufinfo.ptr; + buflen = bufinfo.len - 1; + continue; + case 'B': + p = va_arg(args, unsigned char *); + for (n = prec; n > 0; --n) { + c = *p++; + if (fillch == ' ') + OUTCHAR(' '); + OUTCHAR(hexchars[(c >> 4) & 0xf]); + OUTCHAR(hexchars[c & 0xf]); + } + continue; default: *buf++ = '%'; if (c != '%') @@ -1560,3 +2002,545 @@ vfmtmsg(buf, buflen, fmt, args) *buf = 0; return buf - buf0; } + +/* + * script_setenv - set an environment variable value to be used + * for scripts that we run (e.g. ip-up, auth-up, etc.) + */ +void +script_setenv(var, value) + char *var, *value; +{ + size_t vl = strlen(var) + strlen(value) + 2; + int i; + char *p, *newstring; + + newstring = (char *) malloc(vl); + if (newstring == 0) + return; + slprintf(newstring, vl, "%s=%s", var, value); + + /* check if this variable is already set */ + if (script_env != 0) { + for (i = 0; (p = script_env[i]) != 0; ++i) { + if (strncmp(p, var, vl) == 0 && p[vl] == '=') { + free(p); + script_env[i] = newstring; + return; + } + } + } else { + i = 0; + script_env = (char **) malloc(16 * sizeof(char *)); + if (script_env == 0) + return; + s_env_nalloc = 16; + } + + /* reallocate script_env with more space if needed */ + if (i + 1 >= s_env_nalloc) { + int new_n = i + 17; + char **newenv = (char **) realloc((void *)script_env, + new_n * sizeof(char *)); + if (newenv == 0) + return; + script_env = newenv; + s_env_nalloc = new_n; + } + + script_env[i] = newstring; + script_env[i+1] = 0; +} + +/* + * script_unsetenv - remove a variable from the environment + * for scripts. + */ +void +script_unsetenv(var) + char *var; +{ + int vl = strlen(var); + int i; + char *p; + + if (script_env == 0) + return; + for (i = 0; (p = script_env[i]) != 0; ++i) { + if (strncmp(p, var, vl) == 0 && p[vl] == '=') { + free(p); + while ((script_env[i] = script_env[i+1]) != 0) + ++i; + break; + } + } +} + +/* + * strlcpy - like strcpy/strncpy, doesn't overflow destination buffer, + * always leaves destination null-terminated (for len > 0). + */ +size_t +strlcpy(dest, src, len) + char *dest; + const char *src; + size_t len; +{ + size_t ret = strlen(src); + + if (len != 0) { + if (ret < len) + strcpy(dest, src); + else { + strncpy(dest, src, len - 1); + dest[len-1] = 0; + } + } + return ret; +} + +/* + * strlcat - like strcat/strncat, doesn't overflow destination buffer, + * always leaves destination null-terminated (for len > 0). + */ +size_t +strlcat(dest, src, len) + char *dest; + const char *src; + size_t len; +{ + size_t dlen = strlen(dest); + + return dlen + strlcpy(dest + dlen, src, (len > dlen? len - dlen: 0)); +} + +/* + * logit - does the hard work for fatal et al. + */ +static void +logit(level, fmt, args) + int level; + char *fmt; + va_list args; +{ + int n; + char buf[256]; + + n = vslprintf(buf, sizeof(buf), fmt, args); + syslog(level, "%s", buf); + if (log_to_fd >= 0 && (level != LOG_DEBUG || debug)) { + if (buf[n-1] != '\n') + buf[n++] = '\n'; + if (write(log_to_fd, buf, n) != n) + log_to_fd = -1; + } +} + +/* + * fatal - log an error message and die horribly. + */ +void +fatal __V((char *fmt, ...)) +{ + va_list pvar; + +#if __STDC__ + va_start(pvar, fmt); +#else + char *fmt; + va_start(pvar); + fmt = va_arg(pvar, char *); +#endif + + logit(LOG_ERR, fmt, pvar); + va_end(pvar); + + die(1); /* as promised */ +} + +/* + * error - log an error message. + */ +void +error __V((char *fmt, ...)) +{ + va_list pvar; + +#if __STDC__ + va_start(pvar, fmt); +#else + char *fmt; + va_start(pvar); + fmt = va_arg(pvar, char *); +#endif + + logit(LOG_ERR, fmt, pvar); + va_end(pvar); +} + +/* + * warn - log a warning message. + */ +void +warn __V((char *fmt, ...)) +{ + va_list pvar; + +#if __STDC__ + va_start(pvar, fmt); +#else + char *fmt; + va_start(pvar); + fmt = va_arg(pvar, char *); +#endif + + logit(LOG_WARNING, fmt, pvar); + va_end(pvar); +} + +/* + * notice - log a notice-level message. + */ +void +notice __V((char *fmt, ...)) +{ + va_list pvar; + +#if __STDC__ + va_start(pvar, fmt); +#else + char *fmt; + va_start(pvar); + fmt = va_arg(pvar, char *); +#endif + + logit(LOG_NOTICE, fmt, pvar); + va_end(pvar); +} + +/* + * info - log an informational message. + */ +void +info __V((char *fmt, ...)) +{ + va_list pvar; + +#if __STDC__ + va_start(pvar, fmt); +#else + char *fmt; + va_start(pvar); + fmt = va_arg(pvar, char *); +#endif + + logit(LOG_INFO, fmt, pvar); + va_end(pvar); +} + +/* + * dbglog - log a debug message. + */ +void +dbglog __V((char *fmt, ...)) +{ + va_list pvar; + +#if __STDC__ + va_start(pvar, fmt); +#else + char *fmt; + va_start(pvar); + fmt = va_arg(pvar, char *); +#endif + + logit(LOG_DEBUG, fmt, pvar); + va_end(pvar); +} + +/* + * start_charshunt - create a child process to run the character shunt. + */ +static int +start_charshunt(ifd, ofd) + int ifd, ofd; +{ + int cpid; + + cpid = fork(); + if (cpid == -1) { + error("Can't fork process for character shunt: %m"); + return 0; + } + if (cpid == 0) { + /* child */ + close(pty_slave); + setuid(uid); + if (getuid() != uid) + fatal("setuid failed"); + setgid(getgid()); + if (!nodetach) + log_to_fd = -1; + charshunt(ifd, ofd, record_file); + exit(0); + } + charshunt_pid = cpid; + close(pty_master); + pty_master = -1; + ttyfd = pty_slave; + record_child(cpid, "pppd (charshunt)", charshunt_done, NULL); + return 1; +} + +static void +charshunt_done(arg) + void *arg; +{ + charshunt_pid = 0; +} + +/* + * charshunt - the character shunt, which passes characters between + * the pty master side and the serial port (or stdin/stdout). + * This runs as the user (not as root). + * (We assume ofd >= ifd which is true the way this gets called. :-). + */ +static void +charshunt(ifd, ofd, record_file) + int ifd, ofd; + char *record_file; +{ + int n, nfds; + fd_set ready, writey; + u_char *ibufp, *obufp; + int nibuf, nobuf; + int flags; + int pty_readable, stdin_readable; + struct timeval lasttime; + FILE *recordf = NULL; + + /* + * Reset signal handlers. + */ + signal(SIGHUP, SIG_IGN); /* Hangup */ + signal(SIGINT, SIG_DFL); /* Interrupt */ + signal(SIGTERM, SIG_DFL); /* Terminate */ + signal(SIGCHLD, SIG_DFL); + signal(SIGUSR1, SIG_DFL); + signal(SIGUSR2, SIG_DFL); + signal(SIGABRT, SIG_DFL); + signal(SIGALRM, SIG_DFL); + signal(SIGFPE, SIG_DFL); + signal(SIGILL, SIG_DFL); + signal(SIGPIPE, SIG_DFL); + signal(SIGQUIT, SIG_DFL); + signal(SIGSEGV, SIG_DFL); +#ifdef SIGBUS + signal(SIGBUS, SIG_DFL); +#endif +#ifdef SIGEMT + signal(SIGEMT, SIG_DFL); +#endif +#ifdef SIGPOLL + signal(SIGPOLL, SIG_DFL); +#endif +#ifdef SIGPROF + signal(SIGPROF, SIG_DFL); +#endif +#ifdef SIGSYS + signal(SIGSYS, SIG_DFL); +#endif +#ifdef SIGTRAP + signal(SIGTRAP, SIG_DFL); +#endif +#ifdef SIGVTALRM + signal(SIGVTALRM, SIG_DFL); +#endif +#ifdef SIGXCPU + signal(SIGXCPU, SIG_DFL); +#endif +#ifdef SIGXFSZ + signal(SIGXFSZ, SIG_DFL); +#endif + + /* + * Open the record file if required. + */ + if (record_file != NULL) { + recordf = fopen(record_file, "a"); + if (recordf == NULL) + error("Couldn't create record file %s: %m", record_file); + } + + /* set all the fds to non-blocking mode */ + flags = fcntl(pty_master, F_GETFL); + if (flags == -1 + || fcntl(pty_master, F_SETFL, flags | O_NONBLOCK) == -1) + warn("couldn't set pty master to nonblock: %m"); + flags = fcntl(ifd, F_GETFL); + if (flags == -1 + || fcntl(ifd, F_SETFL, flags | O_NONBLOCK) == -1) + warn("couldn't set %s to nonblock: %m", (ifd==0? "stdin": "tty")); + if (ofd != ifd) { + flags = fcntl(ofd, F_GETFL); + if (flags == -1 + || fcntl(ofd, F_SETFL, flags | O_NONBLOCK) == -1) + warn("couldn't set stdout to nonblock: %m"); + } + + nibuf = nobuf = 0; + ibufp = obufp = NULL; + pty_readable = stdin_readable = 1; + nfds = (ofd > pty_master? ofd: pty_master) + 1; + if (recordf != NULL) { + gettimeofday(&lasttime, NULL); + putc(7, recordf); /* put start marker */ + putc(lasttime.tv_sec >> 24, recordf); + putc(lasttime.tv_sec >> 16, recordf); + putc(lasttime.tv_sec >> 8, recordf); + putc(lasttime.tv_sec, recordf); + lasttime.tv_usec = 0; + } + + while (nibuf != 0 || nobuf != 0 || pty_readable || stdin_readable) { + FD_ZERO(&ready); + FD_ZERO(&writey); + if (nibuf != 0) + FD_SET(pty_master, &writey); + else if (stdin_readable) + FD_SET(ifd, &ready); + if (nobuf != 0) + FD_SET(ofd, &writey); + else if (pty_readable) + FD_SET(pty_master, &ready); + if (select(nfds, &ready, &writey, NULL, NULL) < 0) { + if (errno != EINTR) + fatal("select"); + continue; + } + if (FD_ISSET(ifd, &ready)) { + ibufp = inpacket_buf; + nibuf = read(ifd, ibufp, sizeof(inpacket_buf)); + if (nibuf < 0 && errno == EIO) + nibuf = 0; + if (nibuf < 0) { + if (!(errno == EINTR || errno == EAGAIN)) { + error("Error reading standard input: %m"); + break; + } + nibuf = 0; + } else if (nibuf == 0) { + /* end of file from stdin */ + stdin_readable = 0; + /* do a 0-length write, hopefully this will generate + an EOF (hangup) on the slave side. */ + write(pty_master, inpacket_buf, 0); + if (recordf) + if (!record_write(recordf, 4, NULL, 0, &lasttime)) + recordf = NULL; + } else { + FD_SET(pty_master, &writey); + if (recordf) + if (!record_write(recordf, 2, ibufp, nibuf, &lasttime)) + recordf = NULL; + } + } + if (FD_ISSET(pty_master, &ready)) { + obufp = outpacket_buf; + nobuf = read(pty_master, obufp, sizeof(outpacket_buf)); + if (nobuf < 0 && errno == EIO) + nobuf = 0; + if (nobuf < 0) { + if (!(errno == EINTR || errno == EAGAIN)) { + error("Error reading pseudo-tty master: %m"); + break; + } + nobuf = 0; + } else if (nobuf == 0) { + /* end of file from the pty - slave side has closed */ + pty_readable = 0; + stdin_readable = 0; /* pty is not writable now */ + nibuf = 0; + close(ofd); + if (recordf) + if (!record_write(recordf, 3, NULL, 0, &lasttime)) + recordf = NULL; + } else { + FD_SET(ofd, &writey); + if (recordf) + if (!record_write(recordf, 1, obufp, nobuf, &lasttime)) + recordf = NULL; + } + } + if (FD_ISSET(ofd, &writey)) { + n = write(ofd, obufp, nobuf); + if (n < 0) { + if (errno != EIO) { + error("Error writing standard output: %m"); + break; + } + pty_readable = 0; + nobuf = 0; + } else { + obufp += n; + nobuf -= n; + } + } + if (FD_ISSET(pty_master, &writey)) { + n = write(pty_master, ibufp, nibuf); + if (n < 0) { + if (errno != EIO) { + error("Error writing pseudo-tty master: %m"); + break; + } + stdin_readable = 0; + nibuf = 0; + } else { + ibufp += n; + nibuf -= n; + } + } + } + exit(0); +} + +static int +record_write(f, code, buf, nb, tp) + FILE *f; + int code; + u_char *buf; + int nb; + struct timeval *tp; +{ + struct timeval now; + int diff; + + gettimeofday(&now, NULL); + now.tv_usec /= 100000; /* actually 1/10 s, not usec now */ + diff = (now.tv_sec - tp->tv_sec) * 10 + (now.tv_usec - tp->tv_usec); + if (diff > 0) { + if (diff > 255) { + putc(5, f); + putc(diff >> 24, f); + putc(diff >> 16, f); + putc(diff >> 8, f); + putc(diff, f); + } else { + putc(6, f); + putc(diff, f); + } + *tp = now; + } + putc(code, f); + if (buf != NULL) { + putc(nb >> 8, f); + putc(nb, f); + fwrite(buf, nb, 1, f); + } + fflush(f); + if (ferror(f)) { + error("Error writing record file: %m"); + return 0; + } + return 1; +}