From ab5559aaabd1167a18ac882e64d97c5adc0e7d03 Mon Sep 17 00:00:00 2001 From: Guillaume Cottenceau Date: Mon, 11 Jun 2001 11:44:34 +0000 Subject: Initial revision --- mdk-stage1/ppp/pppd/main.c | 1831 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1831 insertions(+) create mode 100644 mdk-stage1/ppp/pppd/main.c (limited to 'mdk-stage1/ppp/pppd/main.c') diff --git a/mdk-stage1/ppp/pppd/main.c b/mdk-stage1/ppp/pppd/main.c new file mode 100644 index 000000000..8789d3b1d --- /dev/null +++ b/mdk-stage1/ppp/pppd/main.c @@ -0,0 +1,1831 @@ +/* + * main.c - Point-to-Point Protocol main module + * + * Copyright (c) 1989 Carnegie Mellon University. + * All rights reserved. + * + * Redistribution and use in source and binary forms are permitted + * provided that the above copyright notice and this paragraph are + * duplicated in all such forms and that any documentation, + * advertising materials, and other materials related to such + * distribution and use acknowledge that the software was developed + * by Carnegie Mellon University. The name of the + * University may not be used to endorse or promote products derived + * from this software without specific prior written permission. + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +#define RCSID "$Id$" + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "pppd.h" +#include "magic.h" +#include "fsm.h" +#include "lcp.h" +#include "ipcp.h" +#ifdef INET6 +#include "ipv6cp.h" +#endif +#include "upap.h" +#include "chap.h" +#include "ccp.h" +#include "pathnames.h" +#include "tdb.h" + +#ifdef CBCP_SUPPORT +#include "cbcp.h" +#endif + +#ifdef IPX_CHANGE +#include "ipxcp.h" +#endif /* IPX_CHANGE */ +#ifdef AT_CHANGE +#include "atcp.h" +#endif + +static const char rcsid[] = RCSID; + +/* interface vars */ +char ifname[32]; /* Interface name */ +int ifunit; /* Interface unit number */ + +struct channel *the_channel; + +char *progname; /* Name of this program */ +char hostname[MAXNAMELEN]; /* Our hostname */ +static char pidfilename[MAXPATHLEN]; /* name of pid file */ +static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */ +char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */ +uid_t uid; /* Our real user-id */ +struct notifier *pidchange = NULL; +struct notifier *phasechange = NULL; +struct notifier *exitnotify = NULL; +struct notifier *sigreceived = NULL; + +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 */ +volatile int status; /* exit status for pppd */ +int unsuccess; /* # unsuccessful connection attempts */ +int do_callback; /* != 0 if we should do callback next */ +int doing_callback; /* != 0 if we are doing callback */ +TDB_CONTEXT *pppdb; /* database for storing status etc. */ +char db_key[32]; + +int (*holdoff_hook) __P((void)) = NULL; +int (*new_phase_hook) __P((int)) = NULL; + +static int conn_running; /* we have a [dis]connector running */ +static int devfd; /* fd of underlying device */ +static int fd_ppp = -1; /* fd for talking PPP */ +static int fd_loop; /* fd for getting demand-dial packets */ + +int phase; /* where the link is at */ +int kill_link; +int open_ccp_flag; +int listen_time; +int got_sigusr2; +int got_sigterm; +int got_sighup; + +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 */ + +int privopen; /* don't lock, open device as root */ + +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_connect_time; +int link_stats_valid; + +/* + * 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; +}; + +static struct subprocess *children; + +/* Prototypes for procedures local to this file. */ + +static void setup_signals __P((void)); +static void create_pidfile __P((void)); +static void create_linkpidfile __P((void)); +static void cleanup __P((void)); +static void get_input __P((void)); +static void calltimeout __P((void)); +static struct timeval *timeleft __P((struct timeval *)); +static void kill_my_pg __P((int)); +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 holdoff_end __P((void *)); +static int reap_kids __P((int waitfor)); +static void update_db_entry __P((void)); +static void add_db_key __P((const char *)); +static void delete_db_key __P((const char *)); +static void cleanup_db __P((void)); +static void handle_events __P((void)); + +extern char *ttyname __P((int)); +extern char *getlogin __P((void)); +int main __P((int, char *[])); + +#ifdef ultrix +#undef O_NONBLOCK +#define O_NONBLOCK O_NDELAY +#endif + +#ifdef ULTRIX +#define setlogmask(x) +#endif + +/* + * PPP Data Link Layer "protocol" table. + * One entry per supported protocol. + * The last entry must be NULL. + */ +struct protent *protocols[] = { + &lcp_protent, + &pap_protent, + &chap_protent, +#ifdef CBCP_SUPPORT + &cbcp_protent, +#endif + &ipcp_protent, +#ifdef INET6 + &ipv6cp_protent, +#endif + &ccp_protent, +#ifdef IPX_CHANGE + &ipxcp_protent, +#endif +#ifdef AT_CHANGE + &atcp_protent, +#endif + NULL +}; + +/* + * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name. + */ +#if !defined(PPP_DRV_NAME) +#define PPP_DRV_NAME "ppp" +#endif /* !defined(PPP_DRV_NAME) */ + +int +main(argc, argv) + int argc; + char *argv[]; +{ + int i, t; + char *p; + struct passwd *pw; + struct protent *protp; + char numbuf[16]; + + new_phase(PHASE_INITIALIZE); + + /* + * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else. + * This way we can close 0, 1, 2 in detach() without clobbering + * a fd that we are using. + */ + if ((i = open("/dev/null", O_RDWR)) >= 0) { + while (0 <= i && i <= 2) + i = dup(i); + if (i >= 0) + close(i); + } + + script_env = NULL; + + /* Initialize syslog facilities */ + reopen_log(); + + if (gethostname(hostname, MAXNAMELEN) < 0 ) { + option_error("Couldn't get hostname: %m"); + exit(1); + } + hostname[MAXNAMELEN-1] = 0; + + /* make sure we don't create world or group writable files. */ + umask(umask(0777) | 022); + + uid = getuid(); + privileged = uid == 0; + slprintf(numbuf, sizeof(numbuf), "%d", uid); + script_setenv("ORIG_UID", numbuf, 0); + + ngroups = getgroups(NGROUPS_MAX, groups); + + /* + * Initialize magic number generator now so that protocols may + * use magic numbers in initialization. + */ + magic_init(); + + /* + * Initialize each protocol. + */ + for (i = 0; (protp = protocols[i]) != NULL; ++i) + (*protp->init)(0); + + /* + * Initialize the default channel. + */ + tty_init(); + + progname = *argv; + + /* + * Parse, in order, the system options file, the user's options file, + * and the command line arguments. + */ + if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1) + || !options_from_user() + || !parse_args(argc-1, argv+1)) + exit(EXIT_OPTION_ERROR); + devnam_fixed = 1; /* can no longer change device name */ + + /* + * Work out the device name, if it hasn't already been specified, + * and parse the tty's options file. + */ + if (the_channel->process_extra_options) + (*the_channel->process_extra_options)(); + + if (debug) + setlogmask(LOG_UPTO(LOG_DEBUG)); + + /* + * Check that we are running as root. + */ + if (geteuid() != 0) { + option_error("must be root to run %s, since it is not setuid-root", + argv[0]); + exit(EXIT_NOT_ROOT); + } + + if (!ppp_available()) { + option_error("%s", no_ppp_msg); + exit(EXIT_NO_KERNEL_SUPPORT); + } + + /* + * Check that the options given are valid and consistent. + */ + check_options(); + if (!sys_check_options()) + exit(EXIT_OPTION_ERROR); + auth_check_options(); +#ifdef HAVE_MULTILINK + mp_check_options(); +#endif + for (i = 0; (protp = protocols[i]) != NULL; ++i) + if (protp->check_options != NULL) + (*protp->check_options)(); + if (the_channel->check_options) + (*the_channel->check_options)(); + + + if (dump_options || dryrun) { + init_pr_log(NULL, LOG_INFO); + print_options(pr_log, NULL); + end_pr_log(); + if (dryrun) + die(0); + } + + /* + * Initialize system-dependent stuff. + */ + sys_init(); + + pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644); + if (pppdb != NULL) { + slprintf(db_key, sizeof(db_key), "pppd%d", getpid()); + update_db_entry(); + } else { + warn("Warning: couldn't open ppp database %s", _PATH_PPPDB); + if (multilink) { + warn("Warning: disabling multilink"); + multilink = 0; + } + } + + /* + * Detach ourselves from the terminal, if required, + * and identify who is running us. + */ + if (!nodetach && !updetach) + detach(); + p = getlogin(); + if (p == NULL) { + pw = getpwuid(uid); + if (pw != NULL && pw->pw_name != NULL) + p = pw->pw_name; + else + p = "(unknown)"; + } + syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid); + script_setenv("PPPLOGNAME", p, 0); + + if (devnam[0]) + script_setenv("DEVICE", devnam, 1); + slprintf(numbuf, sizeof(numbuf), "%d", getpid()); + script_setenv("PPPD_PID", numbuf, 1); + + setup_signals(); + + waiting = 0; + + create_linkpidfile(); + + /* + * If we're doing dial-on-demand, set up the interface now. + */ + if (demand) { + /* + * Open the loopback channel and set it up to be the ppp interface. + */ + tdb_writelock(pppdb); + fd_loop = open_ppp_loopback(); + set_ifunit(1); + tdb_writeunlock(pppdb); + + /* + * Configure the interface and mark it up, etc. + */ + demand_conf(); + } + + do_callback = 0; + for (;;) { + + listen_time = 0; + need_holdoff = 1; + devfd = -1; + status = EXIT_OK; + ++unsuccess; + doing_callback = do_callback; + do_callback = 0; + + if (demand && !doing_callback) { + /* + * Don't do anything until we see some activity. + */ + new_phase(PHASE_DORMANT); + demand_unblock(); + add_fd(fd_loop); + for (;;) { + handle_events(); + if (kill_link && !persist) + break; + if (get_loop_output()) + break; + } + remove_fd(fd_loop); + if (kill_link && !persist) + break; + + /* + * Now we want to bring up the link. + */ + demand_block(); + info("Starting link"); + } + + new_phase(PHASE_SERIALCONN); + + devfd = the_channel->connect(); + if (devfd < 0) + goto fail; + + /* set up the serial device as a ppp interface */ + tdb_writelock(pppdb); + fd_ppp = the_channel->establish_ppp(devfd); + if (fd_ppp < 0) { + tdb_writeunlock(pppdb); + status = EXIT_FATAL_ERROR; + goto disconnect; + } + + if (!demand && ifunit >= 0) + set_ifunit(1); + tdb_writeunlock(pppdb); + + /* + * Start opening the connection and wait for + * incoming events (reply, timeout, etc.). + */ + notice("Connect: %s <--> %s", ifname, ppp_devnam); + gettimeofday(&start_time, NULL); + link_stats_valid = 0; + script_unsetenv("CONNECT_TIME"); + script_unsetenv("BYTES_SENT"); + script_unsetenv("BYTES_RCVD"); + lcp_lowerup(0); + + add_fd(fd_ppp); + lcp_open(0); /* Start protocol */ + status = EXIT_NEGOTIATION_FAILED; + new_phase(PHASE_ESTABLISH); + while (phase != PHASE_DEAD) { + handle_events(); + get_input(); + if (kill_link) + lcp_close(0, "User request"); + if (open_ccp_flag) { + if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) { + ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */ + (*ccp_protent.open)(0); + } + } + } + + /* + * Print connect time and statistics. + */ + if (link_stats_valid) { + int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */ + info("Connect time %d.%d minutes.", t/10, t%10); + info("Sent %u bytes, received %u bytes.", + link_stats.bytes_out, link_stats.bytes_in); + } + + /* + * Delete pid file before disestablishing ppp. Otherwise it + * can happen that another pppd gets the same unit and then + * we delete its pid file. + */ + if (!demand) { + if (pidfilename[0] != 0 + && unlink(pidfilename) < 0 && errno != ENOENT) + warn("unable to delete pid file %s: %m", pidfilename); + pidfilename[0] = 0; + } + + /* + * If we may want to bring the link up again, transfer + * 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(); + the_channel->disestablish_ppp(devfd); + fd_ppp = -1; + if (!hungup) + lcp_lowerdown(0); + if (!demand) + script_unsetenv("IFNAME"); + + /* + * Run disconnector script, if requested. + * XXX we may not be able to do this if the line has hung up! + */ + disconnect: + new_phase(PHASE_DISCONNECT); + the_channel->disconnect(); + + fail: + if (the_channel->cleanup) + (*the_channel->cleanup)(); + + if (!demand) { + if (pidfilename[0] != 0 + && unlink(pidfilename) < 0 && errno != ENOENT) + warn("unable to delete pid file %s: %m", pidfilename); + pidfilename[0] = 0; + } + + if (!persist || (maxfail > 0 && unsuccess >= maxfail)) + break; + + if (demand) + demand_discard(); + t = need_holdoff? holdoff: 0; + if (holdoff_hook) + t = (*holdoff_hook)(); + if (t > 0) { + new_phase(PHASE_HOLDOFF); + TIMEOUT(holdoff_end, NULL, t); + do { + handle_events(); + if (kill_link) + new_phase(PHASE_DORMANT); /* allow signal to end holdoff */ + } while (phase == PHASE_HOLDOFF); + if (!persist) + break; + } + } + + /* Wait for scripts to finish */ + /* XXX should have a timeout here */ + while (n_children > 0) { + if (debug) { + struct subprocess *chp; + dbglog("Waiting for %d child processes...", n_children); + for (chp = children; chp != NULL; chp = chp->next) + dbglog(" script %s, pid %d", chp->prog, chp->pid); + } + if (reap_kids(1) < 0) + break; + } + + die(status); + return 0; +} + +/* + * handle_events - wait for something to happen and respond to it. + */ +static void +handle_events() +{ + struct timeval timo; + sigset_t mask; + + kill_link = open_ccp_flag = 0; + if (sigsetjmp(sigjmp, 1) == 0) { + sigprocmask(SIG_BLOCK, &mask, NULL); + if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) { + sigprocmask(SIG_UNBLOCK, &mask, NULL); + } else { + waiting = 1; + sigprocmask(SIG_UNBLOCK, &mask, NULL); + wait_input(timeleft(&timo)); + } + } + waiting = 0; + calltimeout(); + if (got_sighup) { + kill_link = 1; + got_sighup = 0; + if (status != EXIT_HANGUP) + status = EXIT_USER_REQUEST; + } + if (got_sigterm) { + kill_link = 1; + persist = 0; + status = EXIT_USER_REQUEST; + got_sigterm = 0; + } + if (got_sigchld) { + reap_kids(0); /* Don't leave dead kids lying around */ + got_sigchld = 0; + } + if (got_sigusr2) { + open_ccp_flag = 1; + got_sigusr2 = 0; + } +} + +/* + * setup_signals - initialize signal handling. + */ +static void +setup_signals() +{ + struct sigaction sa; + sigset_t mask; + + /* + * Compute mask of all interesting signals and install signal handlers + * for each. Only one signal handler may be active at a time. Therefore, + * all other signals should be masked when any handler is executing. + */ + sigemptyset(&mask); + sigaddset(&mask, SIGHUP); + sigaddset(&mask, SIGINT); + sigaddset(&mask, SIGTERM); + sigaddset(&mask, SIGCHLD); + sigaddset(&mask, SIGUSR2); + +#define SIGNAL(s, handler) do { \ + sa.sa_handler = handler; \ + 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; + SIGNAL(SIGHUP, hup); /* Hangup */ + SIGNAL(SIGINT, term); /* Interrupt */ + SIGNAL(SIGTERM, term); /* Terminate */ + SIGNAL(SIGCHLD, chld); + + 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 + + /* + * Apparently we can get a SIGPIPE when we call syslog, if + * syslogd has died and been restarted. Ignoring it seems + * be sufficient. + */ + signal(SIGPIPE, SIG_IGN); +} + +/* + * set_ifunit - do things we need to do once we know which ppp + * unit we are using. + */ +void +set_ifunit(iskey) + int iskey; +{ + info("Using interface %s%d", PPP_DRV_NAME, ifunit); + slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit); + script_setenv("IFNAME", ifname, iskey); + if (iskey) { + create_pidfile(); /* write pid to file */ + create_linkpidfile(); + } +} + +/* + * detach - detach us from the controlling terminal. + */ +void +detach() +{ + int pid; + char numbuf[16]; + + if (detached) + return; + if ((pid = fork()) < 0) { + error("Couldn't detach (fork failed: %m)"); + die(1); /* or just return? */ + } + if (pid != 0) { + /* parent */ + notify(pidchange, pid); + exit(0); /* parent dies */ + } + setsid(); + chdir("/"); + close(0); + close(1); + close(2); + detached = 1; + if (log_default) + log_to_fd = -1; + /* update pid files if they have been written already */ + if (pidfilename[0]) + create_pidfile(); + if (linkpidfile[0]) + create_linkpidfile(); + slprintf(numbuf, sizeof(numbuf), "%d", getpid()); + script_setenv("PPPD_PID", numbuf, 1); +} + +/* + * 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; + + slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid", + _PATH_VARRUN, ifname); + if ((pidfile = fopen(pidfilename, "w")) != NULL) { + fprintf(pidfile, "%d\n", getpid()); + (void) fclose(pidfile); + } else { + error("Failed to create pid file %s: %m", pidfilename); + pidfilename[0] = 0; + } +} + +static void +create_linkpidfile() +{ + FILE *pidfile; + + if (linkname[0] == 0) + return; + script_setenv("LINKNAME", linkname, 1); + slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid", + _PATH_VARRUN, linkname); + if ((pidfile = fopen(linkpidfile, "w")) != NULL) { + fprintf(pidfile, "%d\n", getpid()); + if (ifname[0]) + fprintf(pidfile, "%s\n", ifname); + (void) fclose(pidfile); + } else { + error("Failed to create pid file %s: %m", linkpidfile); + linkpidfile[0] = 0; + } +} + +/* + * holdoff_end - called via a timeout when the holdoff period ends. + */ +static void +holdoff_end(arg) + void *arg; +{ + new_phase(PHASE_DORMANT); +} + +/* List of protocol names, to make our messages a little more informative. */ +struct protocol_list { + u_short proto; + const char *name; +} protocol_list[] = { + { 0x21, "IP" }, + { 0x23, "OSI Network Layer" }, + { 0x25, "Xerox NS IDP" }, + { 0x27, "DECnet Phase IV" }, + { 0x29, "Appletalk" }, + { 0x2b, "Novell IPX" }, + { 0x2d, "VJ compressed TCP/IP" }, + { 0x2f, "VJ uncompressed TCP/IP" }, + { 0x31, "Bridging PDU" }, + { 0x33, "Stream Protocol ST-II" }, + { 0x35, "Banyan Vines" }, + { 0x39, "AppleTalk EDDP" }, + { 0x3b, "AppleTalk SmartBuffered" }, + { 0x3d, "Multi-Link" }, + { 0x3f, "NETBIOS Framing" }, + { 0x41, "Cisco Systems" }, + { 0x43, "Ascom Timeplex" }, + { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" }, + { 0x47, "DCA Remote Lan" }, + { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" }, + { 0x4b, "SNA over 802.2" }, + { 0x4d, "SNA" }, + { 0x4f, "IP6 Header Compression" }, + { 0x6f, "Stampede Bridging" }, + { 0xfb, "single-link compression" }, + { 0xfd, "1st choice compression" }, + { 0x0201, "802.1d Hello Packets" }, + { 0x0203, "IBM Source Routing BPDU" }, + { 0x0205, "DEC LANBridge100 Spanning Tree" }, + { 0x0231, "Luxcom" }, + { 0x0233, "Sigma Network Systems" }, + { 0x8021, "Internet Protocol Control Protocol" }, + { 0x8023, "OSI Network Layer Control Protocol" }, + { 0x8025, "Xerox NS IDP Control Protocol" }, + { 0x8027, "DECnet Phase IV Control Protocol" }, + { 0x8029, "Appletalk Control Protocol" }, + { 0x802b, "Novell IPX Control Protocol" }, + { 0x8031, "Bridging NCP" }, + { 0x8033, "Stream Protocol Control Protocol" }, + { 0x8035, "Banyan Vines Control Protocol" }, + { 0x803d, "Multi-Link Control Protocol" }, + { 0x803f, "NETBIOS Framing Control Protocol" }, + { 0x8041, "Cisco Systems Control Protocol" }, + { 0x8043, "Ascom Timeplex" }, + { 0x8045, "Fujitsu LBLB Control Protocol" }, + { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" }, + { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" }, + { 0x804b, "SNA over 802.2 Control Protocol" }, + { 0x804d, "SNA Control Protocol" }, + { 0x804f, "IP6 Header Compression Control Protocol" }, + { 0x006f, "Stampede Bridging Control Protocol" }, + { 0x80fb, "Single Link Compression Control Protocol" }, + { 0x80fd, "Compression Control Protocol" }, + { 0xc021, "Link Control Protocol" }, + { 0xc023, "Password Authentication Protocol" }, + { 0xc025, "Link Quality Report" }, + { 0xc027, "Shiva Password Authentication Protocol" }, + { 0xc029, "CallBack Control Protocol (CBCP)" }, + { 0xc081, "Container Control Protocol" }, + { 0xc223, "Challenge Handshake Authentication Protocol" }, + { 0xc281, "Proprietary Authentication Protocol" }, + { 0, NULL }, +}; + +/* + * protocol_name - find a name for a PPP protocol. + */ +const char * +protocol_name(proto) + int proto; +{ + struct protocol_list *lp; + + for (lp = protocol_list; lp->proto != 0; ++lp) + if (proto == lp->proto) + return lp->name; + return NULL; +} + +/* + * get_input - called when incoming data is available. + */ +static void +get_input() +{ + int len, i; + u_char *p; + u_short protocol; + struct protent *protp; + + p = inpacket_buf; /* point to beginning of packet buffer */ + + len = read_packet(inpacket_buf); + if (len < 0) + return; + + if (len == 0) { + notice("Modem hangup"); + hungup = 1; + status = EXIT_HANGUP; + lcp_lowerdown(0); /* serial link is no longer available */ + link_terminated(0); + return; + } + + if (debug /*&& (debugflags & DBG_INPACKET)*/) + dbglog("rcvd %P", p, len); + + if (len < PPP_HDRLEN) { + MAINDEBUG(("io(): Received short packet.")); + return; + } + + 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(("get_input: Received non-LCP packet when LCP not open.")); + return; + } + + /* + * Until we get past the authentication phase, toss all packets + * except LCP, LQR and authentication packets. + */ + if (phase <= PHASE_AUTHENTICATE + && !(protocol == PPP_LCP || protocol == PPP_LQR + || protocol == PPP_PAP || protocol == PPP_CHAP)) { + MAINDEBUG(("get_input: discarding proto 0x%x in phase %d", + protocol, phase)); + return; + } + + /* + * Upcall the proper protocol input routine. + */ + for (i = 0; (protp = protocols[i]) != NULL; ++i) { + if (protp->protocol == protocol && protp->enabled_flag) { + (*protp->input)(0, p, len); + return; + } + if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag + && protp->datainput != NULL) { + (*protp->datainput)(0, p, len); + return; + } + } + + if (debug) { + const char *pname = protocol_name(protocol); + if (pname != NULL) + warn("Unsupported protocol '%s' (0x%x) received", pname, protocol); + else + warn("Unsupported protocol 0x%x received", protocol); + } + lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN); +} + +/* + * new_phase - signal the start of a new phase of pppd's operation. + */ +void +new_phase(p) + int p; +{ + phase = p; + if (new_phase_hook) + (*new_phase_hook)(p); + notify(phasechange, p); +} + +/* + * die - clean up state and exit with the specified status. + */ +void +die(status) + int status; +{ + cleanup(); + notify(exitnotify, status); + syslog(LOG_INFO, "Exit."); + exit(status); +} + +/* + * cleanup - restore anything which needs to be restored before we exit + */ +/* ARGSUSED */ +static void +cleanup() +{ + sys_cleanup(); + + if (fd_ppp >= 0) + the_channel->disestablish_ppp(devfd); + if (the_channel->cleanup) + (*the_channel->cleanup)(); + + if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT) + warn("unable to delete pid file %s: %m", pidfilename); + pidfilename[0] = 0; + if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT) + warn("unable to delete pid file %s: %m", linkpidfile); + linkpidfile[0] = 0; + + if (pppdb != NULL) + cleanup_db(); +} + +/* + * update_link_stats - get stats at link termination. + */ +void +update_link_stats(u) + int u; +{ + struct timeval now; + char numbuf[32]; + + if (!get_ppp_stats(u, &link_stats) + || gettimeofday(&now, NULL) < 0) + return; + link_connect_time = now.tv_sec - start_time.tv_sec; + link_stats_valid = 1; + + slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time); + script_setenv("CONNECT_TIME", numbuf, 0); + slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_out); + script_setenv("BYTES_SENT", numbuf, 0); + slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_in); + script_setenv("BYTES_RCVD", numbuf, 0); +} + + +struct callout { + struct timeval c_time; /* time at which to call routine */ + void *c_arg; /* argument to routine */ + void (*c_func) __P((void *)); /* routine */ + struct callout *c_next; +}; + +static struct callout *callout = NULL; /* Callout list */ +static struct timeval timenow; /* Current time */ + +/* + * timeout - Schedule a timeout. + * + * Note that this timeout takes the number of milliseconds, NOT hz (as in + * the kernel). + */ +void +timeout(func, arg, secs, usecs) + void (*func) __P((void *)); + void *arg; + int secs, usecs; +{ + struct callout *newp, *p, **pp; + + MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg, + time / 1000, time % 1000)); + + /* + * Allocate timeout. + */ + 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); + newp->c_time.tv_sec = timenow.tv_sec + secs; + newp->c_time.tv_usec = timenow.tv_usec + usecs; + if (newp->c_time.tv_usec >= 1000000) { + newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000; + newp->c_time.tv_usec %= 1000000; + } + + /* + * Find correct place and link it in. + */ + 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_usec)) + break; + newp->c_next = p; + *pp = newp; +} + + +/* + * untimeout - Unschedule a timeout. + */ +void +untimeout(func, arg) + void (*func) __P((void *)); + void *arg; +{ + struct callout **copp, *freep; + + MAINDEBUG(("Untimeout %p:%p.", func, arg)); + + /* + * Find first matching timeout and remove it from the list. + */ + for (copp = &callout; (freep = *copp); copp = &freep->c_next) + if (freep->c_func == func && freep->c_arg == arg) { + *copp = freep->c_next; + free((char *) freep); + break; + } +} + + +/* + * calltimeout - Call any timeout routines which are now due. + */ +static void +calltimeout() +{ + struct callout *p; + + while (callout != NULL) { + p = callout; + + 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))) + break; /* no, it's not time yet */ + + callout = p->c_next; + (*p->c_func)(p->c_arg); + + free((char *) p); + } +} + + +/* + * timeleft - return the length of time until the next timeout is due. + */ +static struct timeval * +timeleft(tvp) + struct timeval *tvp; +{ + if (callout == NULL) + return NULL; + + gettimeofday(&timenow, NULL); + tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec; + tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec; + if (tvp->tv_usec < 0) { + tvp->tv_usec += 1000000; + tvp->tv_sec -= 1; + } + if (tvp->tv_sec < 0) + tvp->tv_sec = tvp->tv_usec = 0; + + return tvp; +} + + +/* + * kill_my_pg - send a signal to our process group, and ignore it ourselves. + */ +static void +kill_my_pg(sig) + int sig; +{ + struct sigaction act, oldact; + + act.sa_handler = SIG_IGN; + act.sa_flags = 0; + kill(0, sig); + sigaction(sig, &act, &oldact); + sigaction(sig, &oldact, NULL); +} + + +/* + * hup - Catch SIGHUP signal. + * + * Indicates that the physical layer has been disconnected. + * We don't rely on this indication; if the user has sent this + * signal, we just take the link down. + */ +static void +hup(sig) + int sig; +{ + info("Hangup (SIGHUP)"); + got_sighup = 1; + if (conn_running) + /* Send the signal to the [dis]connector process(es) also */ + kill_my_pg(sig); + notify(sigreceived, sig); + if (waiting) + siglongjmp(sigjmp, 1); +} + + +/* + * term - Catch SIGTERM signal and SIGINT signal (^C/del). + * + * Indicates that we should initiate a graceful disconnect and exit. + */ +/*ARGSUSED*/ +static void +term(sig) + int sig; +{ + info("Terminating on signal %d.", sig); + got_sigterm = 1; + if (conn_running) + /* Send the signal to the [dis]connector process(es) also */ + kill_my_pg(sig); + notify(sigreceived, sig); + if (waiting) + siglongjmp(sigjmp, 1); +} + + +/* + * chld - Catch SIGCHLD signal. + * Sets a flag so we will call reap_kids in the mainline. + */ +static void +chld(sig) + int sig; +{ + got_sigchld = 1; + if (waiting) + siglongjmp(sigjmp, 1); +} + + +/* + * toggle_debug - Catch SIGUSR1 signal. + * + * Toggle debug flag. + */ +/*ARGSUSED*/ +static void +toggle_debug(sig) + int sig; +{ + debug = !debug; + if (debug) { + setlogmask(LOG_UPTO(LOG_DEBUG)); + } else { + setlogmask(LOG_UPTO(LOG_WARNING)); + } +} + + +/* + * open_ccp - Catch SIGUSR2 signal. + * + * Try to (re)negotiate compression. + */ +/*ARGSUSED*/ +static void +open_ccp(sig) + int sig; +{ + got_sigusr2 = 1; + if (waiting) + siglongjmp(sigjmp, 1); +} + + +/* + * bad_signal - We've caught a fatal signal. Clean up state and exit. + */ +static void +bad_signal(sig) + int sig; +{ + static int crashed = 0; + + if (crashed) + _exit(127); + crashed = 1; + error("Fatal signal %d", sig); + if (conn_running) + kill_my_pg(SIGTERM); + notify(sigreceived, sig); + die(127); +} + + +/* + * device_script - run a program to talk to the specified fds + * (e.g. to run the connector or disconnector script). + * stderr gets connected to the log fd or to the _PATH_CONNERRS file. + */ +int +device_script(program, in, out, dont_wait) + char *program; + int in, out; + int dont_wait; +{ + int pid, fd; + int status = -1; + int errfd; + + ++conn_running; + pid = fork(); + + if (pid < 0) { + --conn_running; + error("Failed to create child process: %m"); + return -1; + } + + if (pid != 0) { + if (dont_wait) { + record_child(pid, program, NULL, NULL); + status = 0; + } else { + while (waitpid(pid, &status, 0) < 0) { + if (errno == EINTR) + continue; + fatal("error waiting for (dis)connection process: %m"); + } + --conn_running; + } + return (status == 0 ? 0 : -1); + } + + /* here we are executing in the child */ + /* make sure fds 0, 1, 2 are occupied */ + while ((fd = dup(in)) >= 0) { + if (fd > 2) { + close(fd); + break; + } + } + + /* dup in and out to fds > 2 */ + in = dup(in); + out = dup(out); + if (log_to_fd >= 0) { + errfd = dup(log_to_fd); + } else { + errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600); + } + + /* close fds 0 - 2 and any others we can think of */ + close(0); + close(1); + close(2); + sys_close(); + if (the_channel->close) + (*the_channel->close)(); + closelog(); + + /* dup the in, out, err fds to 0, 1, 2 */ + dup2(in, 0); + close(in); + dup2(out, 1); + close(out); + if (errfd >= 0) { + dup2(errfd, 2); + close(errfd); + } + + setuid(uid); + if (getuid() != uid) { + error("setuid failed"); + exit(1); + } + setgid(getgid()); + execl("/bin/sh", "sh", "-c", program, (char *)0); + error("could not exec /bin/sh: %m"); + exit(99); + /* NOTREACHED */ +} + + +/* + * 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. + */ +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; + 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) { + 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) umask (S_IRWXG|S_IRWXO); + (void) chdir ("/"); /* no current directory. */ + setuid(0); /* set real UID = root */ + setgid(getegid()); + + /* Ensure that nothing of our device environment is inherited. */ + sys_close(); + closelog(); + close (0); + close (1); + close (2); + if (the_channel->close) + (*the_channel->close)(); + + /* Don't pass handles to the PPP device, even by accident. */ + new_fd = open (_PATH_DEVNULL, O_RDWR); + if (new_fd >= 0) { + if (new_fd != 0) { + dup2 (new_fd, 0); /* stdin <- /dev/null */ + close (new_fd); + } + dup2 (0, 1); /* stdout -> /dev/null */ + 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) + warn("can't reset priority to 0: %m"); +#endif + + /* SysV recommends a second fork at this point. */ + + /* 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); + } + + 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. + */ +void +record_child(pid, prog, done, arg) + int pid; + char *prog; + void (*done) __P((void *)); + void *arg; +{ + struct subprocess *chp; + + ++n_children; + + 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; + } +} + + +/* + * reap_kids - get status from any dead child processes, + * and log a message for abnormal terminations. + */ +static int +reap_kids(waitfor) + int waitfor; +{ + int pid, status; + struct subprocess *chp, **prevp; + + if (n_children == 0) + return 0; + while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1 + && pid != 0) { + for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) { + if (chp->pid == pid) { + --n_children; + *prevp = chp->next; + break; + } + } + if (WIFSIGNALED(status)) { + warn("Child process %s (pid %d) terminated with signal %d", + (chp? chp->prog: "??"), pid, WTERMSIG(status)); + } else if (debug) + dbglog("Script %s finished (pid %d), status = 0x%x", + (chp? chp->prog: "??"), pid, status); + if (chp && chp->done) + (*chp->done)(chp->arg); + if (chp) + free(chp); + } + if (pid == -1) { + if (errno == ECHILD) + return -1; + if (errno != EINTR) + error("Error waiting for child process: %m"); + } + return 0; +} + +/* + * add_notifier - add a new function to be called when something happens. + */ +void +add_notifier(notif, func, arg) + struct notifier **notif; + notify_func func; + void *arg; +{ + struct notifier *np; + + np = malloc(sizeof(struct notifier)); + if (np == 0) + novm("notifier struct"); + np->next = *notif; + np->func = func; + np->arg = arg; + *notif = np; +} + +/* + * remove_notifier - remove a function from the list of things to + * be called when something happens. + */ +void +remove_notifier(notif, func, arg) + struct notifier **notif; + notify_func func; + void *arg; +{ + struct notifier *np; + + for (; (np = *notif) != 0; notif = &np->next) { + if (np->func == func && np->arg == arg) { + *notif = np->next; + free(np); + break; + } + } +} + +/* + * notify - call a set of functions registered with add_notify. + */ +void +notify(notif, val) + struct notifier *notif; + int val; +{ + struct notifier *np; + + while ((np = notif) != 0) { + notif = np->next; + (*np->func)(np->arg, val); + } +} + +/* + * novm - log an error message saying we ran out of memory, and die. + */ +void +novm(msg) + char *msg; +{ + fatal("Virtual memory exhausted allocating %s\n", msg); +} + +/* + * 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, iskey) + char *var, *value; + int iskey; +{ + size_t varl = strlen(var); + size_t vl = varl + strlen(value) + 2; + int i; + char *p, *newstring; + + newstring = (char *) malloc(vl+1); + if (newstring == 0) + return; + *newstring++ = iskey; + 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, varl) == 0 && p[varl] == '=') { + if (p[-1] && pppdb != NULL) + delete_db_key(p); + free(p-1); + script_env[i] = newstring; + if (iskey && pppdb != NULL) + add_db_key(newstring); + update_db_entry(); + return; + } + } + } else { + /* no space allocated for script env. ptrs. yet */ + 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; + + if (pppdb != NULL) { + if (iskey) + add_db_key(newstring); + update_db_entry(); + } +} + +/* + * 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] == '=') { + if (p[-1] && pppdb != NULL) + delete_db_key(p); + free(p-1); + while ((script_env[i] = script_env[i+1]) != 0) + ++i; + break; + } + } + if (pppdb != NULL) + update_db_entry(); +} + +/* + * update_db_entry - update our entry in the database. + */ +static void +update_db_entry() +{ + TDB_DATA key, dbuf; + int vlen, i; + char *p, *q, *vbuf; + + if (script_env == NULL) + return; + vlen = 0; + for (i = 0; (p = script_env[i]) != 0; ++i) + vlen += strlen(p) + 1; + vbuf = malloc(vlen); + if (vbuf == 0) + novm("database entry"); + q = vbuf; + for (i = 0; (p = script_env[i]) != 0; ++i) + q += slprintf(q, vbuf + vlen - q, "%s;", p); + + key.dptr = db_key; + key.dsize = strlen(db_key); + dbuf.dptr = vbuf; + dbuf.dsize = vlen; + if (tdb_store(pppdb, key, dbuf, TDB_REPLACE)) + error("tdb_store failed: %s", tdb_error(pppdb)); + +} + +/* + * add_db_key - add a key that we can use to look up our database entry. + */ +static void +add_db_key(str) + const char *str; +{ + TDB_DATA key, dbuf; + + key.dptr = (char *) str; + key.dsize = strlen(str); + dbuf.dptr = db_key; + dbuf.dsize = strlen(db_key); + if (tdb_store(pppdb, key, dbuf, TDB_REPLACE)) + error("tdb_store key failed: %s", tdb_error(pppdb)); +} + +/* + * delete_db_key - delete a key for looking up our database entry. + */ +static void +delete_db_key(str) + const char *str; +{ + TDB_DATA key; + + key.dptr = (char *) str; + key.dsize = strlen(str); + tdb_delete(pppdb, key); +} + +/* + * cleanup_db - delete all the entries we put in the database. + */ +static void +cleanup_db() +{ + TDB_DATA key; + int i; + char *p; + + key.dptr = db_key; + key.dsize = strlen(db_key); + tdb_delete(pppdb, key); + for (i = 0; (p = script_env[i]) != 0; ++i) + if (p[-1]) + delete_db_key(p); +} -- cgit v1.2.1