X-Git-Url: http://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=pppd%2Fmain.c;h=f136a281291b297e8b81ace181b57397f0764d2a;hp=6541a3be3c472d208f43059ba8f74e3f88431425;hb=f9f667ee187be5d34ac94f11bf366dd218191122;hpb=215baf28fc53e909b987a4b31d7d25ecd4ee7a71;ds=sidebyside diff --git a/pppd/main.c b/pppd/main.c index 6541a3b..f136a28 100644 --- a/pppd/main.c +++ b/pppd/main.c @@ -1,23 +1,72 @@ /* * main.c - Point-to-Point Protocol main module * - * Copyright (c) 1989 Carnegie Mellon University. - * All rights reserved. + * Copyright (c) 1984-2000 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. + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. The name "Carnegie Mellon University" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For permission or any legal + * details, please contact + * Office of Technology Transfer + * Carnegie Mellon University + * 5000 Forbes Avenue + * Pittsburgh, PA 15213-3890 + * (412) 268-4387, fax: (412) 268-7395 + * tech-transfer@andrew.cmu.edu + * + * 4. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by Computing Services + * at Carnegie Mellon University (http://www.cmu.edu/computing/)." + * + * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO + * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE + * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN + * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING + * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + * Copyright (c) 1999-2004 Paul Mackerras. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. The name(s) of the authors of this software must not be used to + * endorse or promote products derived from this software without + * prior written permission. + * + * 3. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by Paul Mackerras + * ". + * + * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO + * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY + * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN + * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING + * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ -#define RCSID "$Id: main.c,v 1.109 2002/01/11 18:10:16 etbe Exp $" +#define RCSID "$Id: main.c,v 1.149 2004/11/14 22:53:42 carlsonj Exp $" #include #include @@ -51,10 +100,15 @@ #include "ipv6cp.h" #endif #include "upap.h" -#include "chap.h" +#include "chap-new.h" +#include "eap.h" #include "ccp.h" +#include "ecp.h" #include "pathnames.h" + +#ifdef USE_TDB #include "tdb.h" +#endif #ifdef CBCP_SUPPORT #include "cbcp.h" @@ -85,6 +139,7 @@ struct notifier *pidchange = NULL; struct notifier *phasechange = NULL; struct notifier *exitnotify = NULL; struct notifier *sigreceived = NULL; +struct notifier *fork_notifier = NULL; int hungup; /* terminal has been hung up */ int privileged; /* we're running as real uid root */ @@ -94,25 +149,37 @@ 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 */ +int ppp_session_number; /* Session number, for channels with such a + concept (eg PPPoE) */ +int childwait_done; /* have timed out waiting for children */ + +#ifdef USE_TDB TDB_CONTEXT *pppdb; /* database for storing status etc. */ +#endif + char db_key[32]; int (*holdoff_hook) __P((void)) = NULL; int (*new_phase_hook) __P((int)) = NULL; +void (*snoop_recv_hook) __P((unsigned char *p, int len)) = NULL; +void (*snoop_send_hook) __P((unsigned char *p, int len)) = 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 fd_devnull; /* fd for /dev/null */ +int devfd = -1; /* fd of underlying device */ +int fd_ppp = -1; /* fd for talking PPP */ int phase; /* where the link is at */ int kill_link; +int asked_to_quit; int open_ccp_flag; int listen_time; int got_sigusr2; int got_sigterm; int got_sighup; +static sigset_t signals_handled; static int waiting; static sigjmp_buf sigjmp; @@ -134,10 +201,16 @@ int ngroups; /* How many groups valid in groups */ static struct timeval start_time; /* Time when link was started. */ +static struct pppd_stats old_link_stats; struct pppd_stats link_stats; -int link_connect_time; +unsigned link_connect_time; int link_stats_valid; +int error_count; + +bool bundle_eof; +bool bundle_terminating; + /* * We maintain a list of child process pids and * functions to call when they exit. @@ -155,8 +228,8 @@ 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 create_pidfile __P((int pid)); +static void create_linkpidfile __P((int pid)); static void cleanup __P((void)); static void get_input __P((void)); static void calltimeout __P((void)); @@ -169,13 +242,18 @@ 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 int reap_kids __P((void)); +static void childwait_end __P((void *)); + +#ifdef USE_TDB 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)); +#endif + static void handle_events __P((void)); -static void print_link_stats __P((void)); +void print_link_stats __P((void)); extern char *ttyname __P((int)); extern char *getlogin __P((void)); @@ -207,12 +285,14 @@ struct protent *protocols[] = { &ipv6cp_protent, #endif &ccp_protent, + &ecp_protent, #ifdef IPX_CHANGE &ipxcp_protent, #endif #ifdef AT_CHANGE &atcp_protent, #endif + &eap_protent, NULL }; @@ -237,18 +317,6 @@ main(argc, argv) link_stats_valid = 0; 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 */ @@ -344,8 +412,20 @@ main(argc, argv) init_pr_log(NULL, LOG_INFO); print_options(pr_log, NULL); end_pr_log(); - if (dryrun) - die(0); + } + + if (dryrun) + die(0); + + /* Make sure fds 0, 1, 2 are open to somewhere. */ + fd_devnull = open(_PATH_DEVNULL, O_RDWR); + if (fd_devnull < 0) + fatal("Couldn't open %s: %m", _PATH_DEVNULL); + while (fd_devnull <= 2) { + i = dup(fd_devnull); + if (i < 0) + fatal("Critical shortage of file descriptors: dup failed: %m"); + fd_devnull = i; } /* @@ -353,6 +433,7 @@ main(argc, argv) */ sys_init(); +#ifdef USE_TDB pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644); if (pppdb != NULL) { slprintf(db_key, sizeof(db_key), "pppd%d", getpid()); @@ -364,6 +445,7 @@ main(argc, argv) multilink = 0; } } +#endif /* * Detach ourselves from the terminal, if required, @@ -389,9 +471,9 @@ main(argc, argv) setup_signals(); - waiting = 0; + create_linkpidfile(getpid()); - create_linkpidfile(); + waiting = 0; /* * If we're doing dial-on-demand, set up the interface now. @@ -400,11 +482,8 @@ main(argc, argv) /* * 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. */ @@ -414,6 +493,8 @@ main(argc, argv) do_callback = 0; for (;;) { + bundle_eof = 0; + bundle_terminating = 0; listen_time = 0; need_holdoff = 1; devfd = -1; @@ -431,13 +512,13 @@ main(argc, argv) add_fd(fd_loop); for (;;) { handle_events(); - if (kill_link && !persist) + if (asked_to_quit) break; if (get_loop_output()) break; } remove_fd(fd_loop); - if (kill_link && !persist) + if (asked_to_quit) break; /* @@ -447,48 +528,22 @@ main(argc, argv) 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.). - */ - if (ifunit >= 0) - notice("Connect: %s <--> %s", ifname, ppp_devnam); - else - notice("Starting negotiation on %s", ppp_devnam); gettimeofday(&start_time, NULL); 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 (asked_to_quit) { + bundle_terminating = 1; + if (phase == PHASE_MASTER) + mp_bundle_terminated(); + } if (open_ccp_flag) { if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) { ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */ @@ -497,54 +552,7 @@ main(argc, argv) } } - print_link_stats(); - - /* - * 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)) + if (!persist || asked_to_quit || (maxfail > 0 && unsuccess >= maxfail)) break; if (demand) @@ -566,16 +574,21 @@ main(argc, argv) } /* Wait for scripts to finish */ - /* XXX should have a timeout here */ - while (n_children > 0) { + reap_kids(); + if (n_children > 0) { + if (child_wait > 0) + TIMEOUT(childwait_end, NULL, child_wait); 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; + while (n_children > 0 && !childwait_done) { + handle_events(); + if (kill_link && !childwait_done) + childwait_end(NULL); + } } die(status); @@ -589,36 +602,38 @@ 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); + sigprocmask(SIG_BLOCK, &signals_handled, NULL); if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) { - sigprocmask(SIG_UNBLOCK, &mask, NULL); + sigprocmask(SIG_UNBLOCK, &signals_handled, NULL); } else { waiting = 1; - sigprocmask(SIG_UNBLOCK, &mask, NULL); + sigprocmask(SIG_UNBLOCK, &signals_handled, NULL); wait_input(timeleft(&timo)); } } waiting = 0; calltimeout(); if (got_sighup) { + info("Hangup (SIGHUP)"); kill_link = 1; got_sighup = 0; if (status != EXIT_HANGUP) status = EXIT_USER_REQUEST; } if (got_sigterm) { + info("Terminating on signal %d", got_sigterm); kill_link = 1; + asked_to_quit = 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; + reap_kids(); /* Don't leave dead kids lying around */ } if (got_sigusr2) { open_ccp_flag = 1; @@ -633,19 +648,18 @@ 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); + sigemptyset(&signals_handled); + sigaddset(&signals_handled, SIGHUP); + sigaddset(&signals_handled, SIGINT); + sigaddset(&signals_handled, SIGTERM); + sigaddset(&signals_handled, SIGCHLD); + sigaddset(&signals_handled, SIGUSR2); #define SIGNAL(s, handler) do { \ sa.sa_handler = handler; \ @@ -653,7 +667,7 @@ setup_signals() fatal("Couldn't establish signal handler (%d): %m", s); \ } while (0) - sa.sa_mask = mask; + sa.sa_mask = signals_handled; sa.sa_flags = 0; SIGNAL(SIGHUP, hup); /* Hangup */ SIGNAL(SIGINT, term); /* Interrupt */ @@ -722,8 +736,8 @@ set_ifunit(iskey) 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(); + create_pidfile(getpid()); /* write pid to file */ + create_linkpidfile(getpid()); } } @@ -735,9 +749,12 @@ detach() { int pid; char numbuf[16]; + int pipefd[2]; if (detached) return; + if (pipe(pipefd) == -1) + pipefd[0] = pipefd[1] = -1; if ((pid = fork()) < 0) { error("Couldn't detach (fork failed: %m)"); die(1); /* or just return? */ @@ -745,23 +762,28 @@ detach() if (pid != 0) { /* parent */ notify(pidchange, pid); + /* update pid files if they have been written already */ + if (pidfilename[0]) + create_pidfile(pid); + if (linkpidfile[0]) + create_linkpidfile(pid); exit(0); /* parent dies */ } setsid(); chdir("/"); - close(0); - close(1); - close(2); + dup2(fd_devnull, 0); + dup2(fd_devnull, 1); + dup2(fd_devnull, 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); + + /* wait for parent to finish updating pid & lock files and die */ + close(pipefd[1]); + complete_read(pipefd[0], numbuf, 1); + close(pipefd[0]); } /* @@ -770,26 +792,23 @@ detach() 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() +create_pidfile(pid) + int pid; { FILE *pidfile; slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid", _PATH_VARRUN, ifname); if ((pidfile = fopen(pidfilename, "w")) != NULL) { - fprintf(pidfile, "%d\n", getpid()); + fprintf(pidfile, "%d\n", pid); (void) fclose(pidfile); } else { error("Failed to create pid file %s: %m", pidfilename); @@ -797,8 +816,9 @@ create_pidfile() } } -static void -create_linkpidfile() +void +create_linkpidfile(pid) + int pid; { FILE *pidfile; @@ -808,7 +828,7 @@ create_linkpidfile() slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid", _PATH_VARRUN, linkname); if ((pidfile = fopen(linkpidfile, "w")) != NULL) { - fprintf(pidfile, "%d\n", getpid()); + fprintf(pidfile, "%d\n", pid); if (ifname[0]) fprintf(pidfile, "%s\n", ifname); (void) fclose(pidfile); @@ -818,6 +838,19 @@ create_linkpidfile() } } +/* + * remove_pidfile - remove our pid files + */ +void remove_pidfiles() +{ + 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; +} + /* * holdoff_end - called via a timeout when the holdoff period ends. */ @@ -856,14 +889,54 @@ struct protocol_list { { 0x4b, "SNA over 802.2" }, { 0x4d, "SNA" }, { 0x4f, "IP6 Header Compression" }, + { 0x51, "KNX Bridging Data" }, + { 0x53, "Encryption" }, + { 0x55, "Individual Link Encryption" }, + { 0x57, "IPv6" }, + { 0x59, "PPP Muxing" }, + { 0x5b, "Vendor-Specific Network Protocol" }, + { 0x61, "RTP IPHC Full Header" }, + { 0x63, "RTP IPHC Compressed TCP" }, + { 0x65, "RTP IPHC Compressed non-TCP" }, + { 0x67, "RTP IPHC Compressed UDP 8" }, + { 0x69, "RTP IPHC Compressed RTP 8" }, { 0x6f, "Stampede Bridging" }, + { 0x73, "MP+" }, + { 0xc1, "NTCITS IPI" }, { 0xfb, "single-link compression" }, - { 0xfd, "1st choice compression" }, + { 0xfd, "Compressed Datagram" }, { 0x0201, "802.1d Hello Packets" }, { 0x0203, "IBM Source Routing BPDU" }, { 0x0205, "DEC LANBridge100 Spanning Tree" }, + { 0x0207, "Cisco Discovery Protocol" }, + { 0x0209, "Netcs Twin Routing" }, + { 0x020b, "STP - Scheduled Transfer Protocol" }, + { 0x020d, "EDP - Extreme Discovery Protocol" }, + { 0x0211, "Optical Supervisory Channel Protocol" }, + { 0x0213, "Optical Supervisory Channel Protocol" }, { 0x0231, "Luxcom" }, { 0x0233, "Sigma Network Systems" }, + { 0x0235, "Apple Client Server Protocol" }, + { 0x0281, "MPLS Unicast" }, + { 0x0283, "MPLS Multicast" }, + { 0x0285, "IEEE p1284.4 standard - data packets" }, + { 0x0287, "ETSI TETRA Network Protocol Type 1" }, + { 0x0289, "Multichannel Flow Treatment Protocol" }, + { 0x2063, "RTP IPHC Compressed TCP No Delta" }, + { 0x2065, "RTP IPHC Context State" }, + { 0x2067, "RTP IPHC Compressed UDP 16" }, + { 0x2069, "RTP IPHC Compressed RTP 16" }, + { 0x4001, "Cray Communications Control Protocol" }, + { 0x4003, "CDPD Mobile Network Registration Protocol" }, + { 0x4005, "Expand accelerator protocol" }, + { 0x4007, "ODSICP NCP" }, + { 0x4009, "DOCSIS DLL" }, + { 0x400B, "Cetacean Network Detection Protocol" }, + { 0x4021, "Stacker LZS" }, + { 0x4023, "RefTek Protocol" }, + { 0x4025, "Fibre Channel" }, + { 0x4027, "EMIT Protocols" }, + { 0x405b, "Vendor-Specific Protocol (VSP)" }, { 0x8021, "Internet Protocol Control Protocol" }, { 0x8023, "OSI Network Layer Control Protocol" }, { 0x8025, "Xerox NS IDP Control Protocol" }, @@ -883,17 +956,43 @@ struct protocol_list { { 0x804b, "SNA over 802.2 Control Protocol" }, { 0x804d, "SNA Control Protocol" }, { 0x804f, "IP6 Header Compression Control Protocol" }, - { 0x006f, "Stampede Bridging Control Protocol" }, + { 0x8051, "KNX Bridging Control Protocol" }, + { 0x8053, "Encryption Control Protocol" }, + { 0x8055, "Individual Link Encryption Control Protocol" }, + { 0x8057, "IPv6 Control Protovol" }, + { 0x8059, "PPP Muxing Control Protocol" }, + { 0x805b, "Vendor-Specific Network Control Protocol (VSNCP)" }, + { 0x806f, "Stampede Bridging Control Protocol" }, + { 0x8073, "MP+ Control Protocol" }, + { 0x80c1, "NTCITS IPI Control Protocol" }, { 0x80fb, "Single Link Compression Control Protocol" }, { 0x80fd, "Compression Control Protocol" }, + { 0x8207, "Cisco Discovery Protocol Control" }, + { 0x8209, "Netcs Twin Routing" }, + { 0x820b, "STP - Control Protocol" }, + { 0x820d, "EDPCP - Extreme Discovery Protocol Ctrl Prtcl" }, + { 0x8235, "Apple Client Server Protocol Control" }, + { 0x8281, "MPLSCP" }, + { 0x8285, "IEEE p1284.4 standard - Protocol Control" }, + { 0x8287, "ETSI TETRA TNP1 Control Protocol" }, + { 0x8289, "Multichannel Flow Treatment Protocol" }, { 0xc021, "Link Control Protocol" }, { 0xc023, "Password Authentication Protocol" }, { 0xc025, "Link Quality Report" }, { 0xc027, "Shiva Password Authentication Protocol" }, { 0xc029, "CallBack Control Protocol (CBCP)" }, + { 0xc02b, "BACP Bandwidth Allocation Control Protocol" }, + { 0xc02d, "BAP" }, + { 0xc05b, "Vendor-Specific Authentication Protocol (VSAP)" }, { 0xc081, "Container Control Protocol" }, { 0xc223, "Challenge Handshake Authentication Protocol" }, + { 0xc225, "RSA Authentication Protocol" }, + { 0xc227, "Extensible Authentication Protocol" }, + { 0xc229, "Mitsubishi Security Info Exch Ptcl (SIEP)" }, + { 0xc26f, "Stampede Bridging Authorization Protocol" }, { 0xc281, "Proprietary Authentication Protocol" }, + { 0xc283, "Proprietary Authentication Protocol" }, + { 0xc481, "Proprietary Node ID Authentication Protocol" }, { 0, NULL }, }; @@ -930,6 +1029,11 @@ get_input() return; if (len == 0) { + if (bundle_eof && multilink_master) { + notice("Last channel has disconnected"); + mp_bundle_terminated(); + return; + } notice("Modem hangup"); hungup = 1; status = EXIT_HANGUP; @@ -944,6 +1048,7 @@ get_input() } dump_packet("rcvd", p, len); + if (snoop_recv_hook) snoop_recv_hook(p, len); p += 2; /* Skip address and control */ GETSHORT(protocol, p); @@ -953,7 +1058,7 @@ get_input() * 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.")); + dbglog("Discarded non-LCP packet when LCP not open"); return; } @@ -963,9 +1068,10 @@ get_input() */ 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)); + || protocol == PPP_PAP || protocol == PPP_CHAP || + protocol == PPP_EAP)) { + dbglog("discarding proto 0x%x in phase %d", + protocol, phase); return; } @@ -994,6 +1100,48 @@ get_input() lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN); } +/* + * ppp_send_config - configure the transmit-side characteristics of + * the ppp interface. Returns -1, indicating an error, if the channel + * send_config procedure called error() (or incremented error_count + * itself), otherwise 0. + */ +int +ppp_send_config(unit, mtu, accm, pcomp, accomp) + int unit, mtu; + u_int32_t accm; + int pcomp, accomp; +{ + int errs; + + if (the_channel->send_config == NULL) + return 0; + errs = error_count; + (*the_channel->send_config)(mtu, accm, pcomp, accomp); + return (error_count != errs)? -1: 0; +} + +/* + * ppp_recv_config - configure the receive-side characteristics of + * the ppp interface. Returns -1, indicating an error, if the channel + * recv_config procedure called error() (or incremented error_count + * itself), otherwise 0. + */ +int +ppp_recv_config(unit, mru, accm, pcomp, accomp) + int unit, mru; + u_int32_t accm; + int pcomp, accomp; +{ + int errs; + + if (the_channel->recv_config == NULL) + return 0; + errs = error_count; + (*the_channel->recv_config)(mru, accm, pcomp, accomp); + return (error_count != errs)? -1: 0; +} + /* * new_phase - signal the start of a new phase of pppd's operation. */ @@ -1014,6 +1162,7 @@ void die(status) int status; { + if (!doing_multilink || multilink_master) print_link_stats(); cleanup(); notify(exitnotify, status); @@ -1034,16 +1183,13 @@ cleanup() the_channel->disestablish_ppp(devfd); if (the_channel->cleanup) (*the_channel->cleanup)(); + remove_pidfiles(); - 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; - +#ifdef USE_TDB if (pppdb != NULL) cleanup_db(); +#endif + } void @@ -1057,9 +1203,22 @@ print_link_stats() 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); + link_stats_valid = 0; } } +/* + * reset_link_stats - "reset" stats when link goes up. + */ +void +reset_link_stats(u) + int u; +{ + if (!get_ppp_stats(u, &old_link_stats)) + return; + gettimeofday(&start_time, NULL); +} + /* * update_link_stats - get stats at link termination. */ @@ -1076,11 +1235,16 @@ update_link_stats(u) link_connect_time = now.tv_sec - start_time.tv_sec; link_stats_valid = 1; - slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time); + link_stats.bytes_in -= old_link_stats.bytes_in; + link_stats.bytes_out -= old_link_stats.bytes_out; + link_stats.pkts_in -= old_link_stats.pkts_in; + link_stats.pkts_out -= old_link_stats.pkts_out; + + slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time); script_setenv("CONNECT_TIME", numbuf, 0); - slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_out); + slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_out); script_setenv("BYTES_SENT", numbuf, 0); - slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_in); + slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_in); script_setenv("BYTES_RCVD", numbuf, 0); } @@ -1106,9 +1270,6 @@ timeout(func, arg, secs, usecs) { struct callout *newp, *p, **pp; - MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg, - secs, usecs/1000)); - /* * Allocate timeout. */ @@ -1147,8 +1308,6 @@ untimeout(func, arg) { struct callout **copp, *freep; - MAINDEBUG(("Untimeout %p:%p.", func, arg)); - /* * Find first matching timeout and remove it from the list. */ @@ -1213,6 +1372,7 @@ timeleft(tvp) /* * kill_my_pg - send a signal to our process group, and ignore it ourselves. + * We assume that sig is currently blocked. */ static void kill_my_pg(sig) @@ -1220,9 +1380,21 @@ kill_my_pg(sig) { struct sigaction act, oldact; + sigemptyset(&act.sa_mask); /* unnecessary in fact */ act.sa_handler = SIG_IGN; act.sa_flags = 0; kill(0, sig); + /* + * The kill() above made the signal pending for us, as well as + * the rest of our process group, but we don't want it delivered + * to us. It is blocked at the moment. Setting it to be ignored + * will cause the pending signal to be discarded. If we did the + * kill() after setting the signal to be ignored, it is unspecified + * (by POSIX) whether the signal is immediately discarded or left + * pending, and in fact Linux would leave it pending, and so it + * would be delivered after the current signal handler exits, + * leading to an infinite loop. + */ sigaction(sig, &act, &oldact); sigaction(sig, &oldact, NULL); } @@ -1239,7 +1411,7 @@ static void hup(sig) int sig; { - info("Hangup (SIGHUP)"); + /* can't log a message here, it can deadlock */ got_sighup = 1; if (conn_running) /* Send the signal to the [dis]connector process(es) also */ @@ -1260,8 +1432,8 @@ static void term(sig) int sig; { - info("Terminating on signal %d.", sig); - got_sigterm = 1; + /* can't log a message here, it can deadlock */ + got_sigterm = sig; if (conn_running) /* Send the signal to the [dis]connector process(es) also */ kill_my_pg(sig); @@ -1339,6 +1511,89 @@ bad_signal(sig) die(127); } +/* + * safe_fork - Create a child process. The child closes all the + * file descriptors that we don't want to leak to a script. + * The parent waits for the child to do this before returning. + * This also arranges for the specified fds to be dup'd to + * fds 0, 1, 2 in the child. + */ +pid_t +safe_fork(int infd, int outfd, int errfd) +{ + pid_t pid; + int fd, pipefd[2]; + char buf[1]; + + /* make sure fds 0, 1, 2 are occupied (probably not necessary) */ + while ((fd = dup(fd_devnull)) >= 0) { + if (fd > 2) { + close(fd); + break; + } + } + + if (pipe(pipefd) == -1) + pipefd[0] = pipefd[1] = -1; + pid = fork(); + if (pid < 0) { + error("fork failed: %m"); + return -1; + } + if (pid > 0) { + /* parent */ + close(pipefd[1]); + /* this read() blocks until the close(pipefd[1]) below */ + complete_read(pipefd[0], buf, 1); + close(pipefd[0]); + return pid; + } + + /* Executing in the child */ + sys_close(); +#ifdef USE_TDB + tdb_close(pppdb); +#endif + + /* make sure infd, outfd and errfd won't get tromped on below */ + if (infd == 1 || infd == 2) + infd = dup(infd); + if (outfd == 0 || outfd == 2) + outfd = dup(outfd); + if (errfd == 0 || errfd == 1) + errfd = dup(errfd); + + /* dup the in, out, err fds to 0, 1, 2 */ + if (infd != 0) + dup2(infd, 0); + if (outfd != 1) + dup2(outfd, 1); + if (errfd != 2) + dup2(errfd, 2); + + closelog(); + if (log_to_fd > 2) + close(log_to_fd); + if (the_channel->close) + (*the_channel->close)(); + else + close(devfd); /* some plugins don't have a close function */ + close(fd_ppp); + close(fd_devnull); + if (infd != 0) + close(infd); + if (outfd != 1) + close(outfd); + if (errfd != 2) + close(errfd); + + notify(fork_notifier, 0); + close(pipefd[0]); + /* this close unblocks the read() call above in the parent */ + close(pipefd[1]); + + return 0; +} /* * device_script - run a program to talk to the specified fds @@ -1351,12 +1606,20 @@ device_script(program, in, out, dont_wait) int in, out; int dont_wait; { - int pid, fd; + int pid; int status = -1; int errfd; + if (log_to_fd >= 0) + errfd = log_to_fd; + else + errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600); + ++conn_running; - pid = fork(); + pid = safe_fork(in, out, errfd); + + if (pid != 0 && log_to_fd < 0) + close(errfd); if (pid < 0) { --conn_running; @@ -1380,50 +1643,15 @@ device_script(program, in, out, dont_wait) } /* 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); - } + setgid(getgid()); setuid(uid); if (getuid() != uid) { - error("setuid failed"); + fprintf(stderr, "pppd: setuid failed\n"); exit(1); } - setgid(getgid()); execl("/bin/sh", "sh", "-c", program, (char *)0); - error("could not exec /bin/sh: %m"); + perror("pppd: could not exec /bin/sh"); exit(99); /* NOTREACHED */ } @@ -1464,66 +1692,41 @@ run_program(prog, args, must_exist, done, arg) return 0; } - pid = fork(); + pid = safe_fork(fd_devnull, fd_devnull, fd_devnull); 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()); + if (pid != 0) { + if (debug) + dbglog("Script %s started (pid %d)", prog, pid); + record_child(pid, prog, done, arg); + return pid; + } - /* 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 */ - } + /* 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()); #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"); + /* 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); + /* 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(); } - - if (debug) - dbglog("Script %s started (pid %d)", prog, pid); - record_child(pid, prog, done, arg); - - return pid; + _exit(-1); } @@ -1555,22 +1758,37 @@ record_child(pid, prog, done, arg) } } +/* + * childwait_end - we got fed up waiting for the child processes to + * exit, send them all a SIGTERM. + */ +static void +childwait_end(arg) + void *arg; +{ + struct subprocess *chp; + + for (chp = children; chp != NULL; chp = chp->next) { + if (debug) + dbglog("sending SIGTERM to process %d", chp->pid); + kill(chp->pid, SIGTERM); + } + childwait_done = 1; +} /* * reap_kids - get status from any dead child processes, * and log a message for abnormal terminations. */ static int -reap_kids(waitfor) - int waitfor; +reap_kids() { int pid, status; struct subprocess *chp, **prevp; if (n_children == 0) return 0; - while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1 - && pid != 0) { + while ((pid = waitpid(-1, &status, WNOHANG)) != -1 && pid != 0) { for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) { if (chp->pid == pid) { --n_children; @@ -1641,7 +1859,7 @@ remove_notifier(notif, func, arg) } /* - * notify - call a set of functions registered with add_notify. + * notify - call a set of functions registered with add_notifier. */ void notify(notif, val) @@ -1690,13 +1908,17 @@ script_setenv(var, value, iskey) if (script_env != 0) { for (i = 0; (p = script_env[i]) != 0; ++i) { if (strncmp(p, var, varl) == 0 && p[varl] == '=') { +#ifdef USE_TDB if (p[-1] && pppdb != NULL) delete_db_key(p); +#endif free(p-1); script_env[i] = newstring; +#ifdef USE_TDB if (iskey && pppdb != NULL) add_db_key(newstring); update_db_entry(); +#endif return; } } @@ -1723,11 +1945,13 @@ script_setenv(var, value, iskey) script_env[i] = newstring; script_env[i+1] = 0; +#ifdef USE_TDB if (pppdb != NULL) { if (iskey) add_db_key(newstring); update_db_entry(); } +#endif } /* @@ -1746,18 +1970,58 @@ script_unsetenv(var) return; for (i = 0; (p = script_env[i]) != 0; ++i) { if (strncmp(p, var, vl) == 0 && p[vl] == '=') { +#ifdef USE_TDB if (p[-1] && pppdb != NULL) delete_db_key(p); +#endif free(p-1); while ((script_env[i] = script_env[i+1]) != 0) ++i; break; } } +#ifdef USE_TDB if (pppdb != NULL) update_db_entry(); +#endif +} + +/* + * Any arbitrary string used as a key for locking the database. + * It doesn't matter what it is as long as all pppds use the same string. + */ +#define PPPD_LOCK_KEY "pppd lock" + +/* + * lock_db - get an exclusive lock on the TDB database. + * Used to ensure atomicity of various lookup/modify operations. + */ +void lock_db() +{ +#ifdef USE_TDB + TDB_DATA key; + + key.dptr = PPPD_LOCK_KEY; + key.dsize = strlen(key.dptr); + tdb_chainlock(pppdb, key); +#endif +} + +/* + * unlock_db - remove the exclusive lock obtained by lock_db. + */ +void unlock_db() +{ +#ifdef USE_TDB + TDB_DATA key; + + key.dptr = PPPD_LOCK_KEY; + key.dsize = strlen(key.dptr); + tdb_chainunlock(pppdb, key); +#endif } +#ifdef USE_TDB /* * update_db_entry - update our entry in the database. */ @@ -1773,7 +2037,7 @@ update_db_entry() vlen = 0; for (i = 0; (p = script_env[i]) != 0; ++i) vlen += strlen(p) + 1; - vbuf = malloc(vlen); + vbuf = malloc(vlen + 1); if (vbuf == 0) novm("database entry"); q = vbuf; @@ -1840,3 +2104,4 @@ cleanup_db() if (p[-1]) delete_db_key(p); } +#endif /* USE_TDB */