/*- * Copyright (c) 1998 Brian Somers * 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. 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $Id: bundle.c,v 1.11 1998/05/29 18:32:09 brian Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "command.h" #include "mbuf.h" #include "log.h" #include "id.h" #include "defs.h" #include "timer.h" #include "fsm.h" #include "iplist.h" #include "lqr.h" #include "hdlc.h" #include "throughput.h" #include "slcompress.h" #include "ipcp.h" #include "filter.h" #include "descriptor.h" #include "route.h" #include "lcp.h" #include "ccp.h" #include "link.h" #include "mp.h" #include "bundle.h" #include "async.h" #include "physical.h" #include "modem.h" #include "loadalias.h" #include "auth.h" #include "lcpproto.h" #include "chap.h" #include "tun.h" #include "prompt.h" #include "chat.h" #include "datalink.h" #include "ip.h" #define SCATTER_SEGMENTS 4 /* version, datalink, name, physical */ #define SOCKET_OVERHEAD 100 /* additional buffer space for large */ /* {recv,send}msg() calls */ static int bundle_RemainingIdleTime(struct bundle *); static int bundle_RemainingAutoLoadTime(struct bundle *); static const char *PhaseNames[] = { "Dead", "Establish", "Authenticate", "Network", "Terminate" }; const char * bundle_PhaseName(struct bundle *bundle) { return bundle->phase <= PHASE_TERMINATE ? PhaseNames[bundle->phase] : "unknown"; } void bundle_NewPhase(struct bundle *bundle, u_int new) { if (new == bundle->phase) return; if (new <= PHASE_TERMINATE) log_Printf(LogPHASE, "bundle: %s\n", PhaseNames[new]); switch (new) { case PHASE_DEAD: log_DisplayPrompts(); bundle->phase = new; break; case PHASE_ESTABLISH: bundle->phase = new; break; case PHASE_AUTHENTICATE: bundle->phase = new; log_DisplayPrompts(); break; case PHASE_NETWORK: ipcp_Setup(&bundle->ncp.ipcp); fsm_Up(&bundle->ncp.ipcp.fsm); fsm_Open(&bundle->ncp.ipcp.fsm); bundle->phase = new; log_DisplayPrompts(); break; case PHASE_TERMINATE: bundle->phase = new; mp_Down(&bundle->ncp.mp); log_DisplayPrompts(); break; } } static int bundle_CleanInterface(const struct bundle *bundle) { int s; struct ifreq ifrq; struct ifaliasreq ifra; s = ID0socket(AF_INET, SOCK_DGRAM, 0); if (s < 0) { log_Printf(LogERROR, "bundle_CleanInterface: socket(): %s\n", strerror(errno)); return (-1); } strncpy(ifrq.ifr_name, bundle->ifp.Name, sizeof ifrq.ifr_name - 1); ifrq.ifr_name[sizeof ifrq.ifr_name - 1] = '\0'; while (ID0ioctl(s, SIOCGIFADDR, &ifrq) == 0) { memset(&ifra.ifra_mask, '\0', sizeof ifra.ifra_mask); strncpy(ifra.ifra_name, bundle->ifp.Name, sizeof ifra.ifra_name - 1); ifra.ifra_name[sizeof ifra.ifra_name - 1] = '\0'; ifra.ifra_addr = ifrq.ifr_addr; if (ID0ioctl(s, SIOCGIFDSTADDR, &ifrq) < 0) { if (ifra.ifra_addr.sa_family == AF_INET) log_Printf(LogERROR, "bundle_CleanInterface: Can't get dst for %s on %s !\n", inet_ntoa(((struct sockaddr_in *)&ifra.ifra_addr)->sin_addr), bundle->ifp.Name); close(s); return 0; } ifra.ifra_broadaddr = ifrq.ifr_dstaddr; if (ID0ioctl(s, SIOCDIFADDR, &ifra) < 0) { if (ifra.ifra_addr.sa_family == AF_INET) log_Printf(LogERROR, "bundle_CleanInterface: Can't delete %s address on %s !\n", inet_ntoa(((struct sockaddr_in *)&ifra.ifra_addr)->sin_addr), bundle->ifp.Name); close(s); return 0; } } close(s); return 1; } static void bundle_LayerStart(void *v, struct fsm *fp) { /* The given FSM is about to start up ! */ } static void bundle_Notify(struct bundle *bundle, char c) { if (bundle->notify.fd != -1) { if (write(bundle->notify.fd, &c, 1) == 1) log_Printf(LogPHASE, "Parent notified of success.\n"); else log_Printf(LogPHASE, "Failed to notify parent of success.\n"); close(bundle->notify.fd); bundle->notify.fd = -1; } } static void bundle_AutoLoadTimeout(void *v) { struct bundle *bundle = (struct bundle *)v; if (bundle->autoload.comingup) { log_Printf(LogPHASE, "autoload: Another link is required\n"); /* bundle_Open() stops the timer */ bundle_Open(bundle, NULL, PHYS_AUTO); } else { struct datalink *dl, *last; timer_Stop(&bundle->autoload.timer); for (last = NULL, dl = bundle->links; dl; dl = dl->next) if (dl->physical->type == PHYS_AUTO && dl->state == DATALINK_OPEN) last = dl; if (last) datalink_Close(last, 1); } } static void bundle_StartAutoLoadTimer(struct bundle *bundle, int up) { struct datalink *dl; timer_Stop(&bundle->autoload.timer); if (bundle->CleaningUp || bundle->phase != PHASE_NETWORK) { dl = NULL; bundle->autoload.running = 0; } else if (up) { for (dl = bundle->links; dl; dl = dl->next) if (dl->state == DATALINK_CLOSED && dl->physical->type == PHYS_AUTO) { if (bundle->cfg.autoload.max.timeout) { bundle->autoload.timer.func = bundle_AutoLoadTimeout; bundle->autoload.timer.name = "autoload up"; bundle->autoload.timer.load = bundle->cfg.autoload.max.timeout * SECTICKS; bundle->autoload.timer.arg = bundle; timer_Start(&bundle->autoload.timer); bundle->autoload.done = time(NULL) + bundle->cfg.autoload.max.timeout; } else bundle_AutoLoadTimeout(bundle); break; } bundle->autoload.running = (dl || bundle->cfg.autoload.min.timeout) ? 1 : 0; } else { int nlinks; struct datalink *adl; for (nlinks = 0, adl = NULL, dl = bundle->links; dl; dl = dl->next) if (dl->state == DATALINK_OPEN) { if (dl->physical->type == PHYS_AUTO) adl = dl; if (++nlinks > 1 && adl) { if (bundle->cfg.autoload.min.timeout) { bundle->autoload.timer.func = bundle_AutoLoadTimeout; bundle->autoload.timer.name = "autoload down"; bundle->autoload.timer.load = bundle->cfg.autoload.min.timeout * SECTICKS; bundle->autoload.timer.arg = bundle; timer_Start(&bundle->autoload.timer); bundle->autoload.done = time(NULL) + bundle->cfg.autoload.min.timeout; } break; } } bundle->autoload.running = 1; } bundle->autoload.comingup = up ? 1 : 0; } static void bundle_StopAutoLoadTimer(struct bundle *bundle) { timer_Stop(&bundle->autoload.timer); bundle->autoload.done = 0; } static int bundle_RemainingAutoLoadTime(struct bundle *bundle) { if (bundle->autoload.done) return bundle->autoload.done - time(NULL); return -1; } static void bundle_LayerUp(void *v, struct fsm *fp) { /* * The given fsm is now up * If it's an LCP set our mtu (if we're multilink, add up the link * speeds and set the MRRU) and start our autoload timer. * If it's an NCP, tell our -background parent to go away. * If it's the first NCP, start the idle timer. */ struct bundle *bundle = (struct bundle *)v; if (fp->proto == PROTO_LCP) { if (bundle->ncp.mp.active) { struct datalink *dl; bundle->ifp.Speed = 0; for (dl = bundle->links; dl; dl = dl->next) if (dl->state == DATALINK_OPEN) bundle->ifp.Speed += modem_Speed(dl->physical); tun_configure(bundle, bundle->ncp.mp.peer_mrru); bundle->autoload.running = 1; } else { bundle->ifp.Speed = modem_Speed(link2physical(fp->link)); tun_configure(bundle, fsm2lcp(fp)->his_mru); } } else if (fp->proto == PROTO_IPCP) { bundle_StartIdleTimer(bundle); bundle_Notify(bundle, EX_NORMAL); } } static void bundle_LayerDown(void *v, struct fsm *fp) { /* * The given FSM has been told to come down. * If it's our last NCP, stop the idle timer. * If it's an LCP and we're in multilink mode, adjust our tun * speed and make sure our minimum sequence number is adjusted. */ struct bundle *bundle = (struct bundle *)v; if (fp->proto == PROTO_IPCP) bundle_StopIdleTimer(bundle); else if (fp->proto == PROTO_LCP && bundle->ncp.mp.active) { struct datalink *dl; struct datalink *lost; bundle->ifp.Speed = 0; lost = NULL; for (dl = bundle->links; dl; dl = dl->next) if (fp == &dl->physical->link.lcp.fsm) lost = dl; else if (dl->state == DATALINK_OPEN) bundle->ifp.Speed += modem_Speed(dl->physical); if (bundle->ifp.Speed) /* Don't configure down to a speed of 0 */ tun_configure(bundle, bundle->ncp.mp.link.lcp.his_mru); if (lost) mp_LinkLost(&bundle->ncp.mp, lost); else log_Printf(LogERROR, "Oops, lost an unrecognised datalink (%s) !\n", fp->link->name); } } static void bundle_LayerFinish(void *v, struct fsm *fp) { /* The given fsm is now down (fp cannot be NULL) * * If it's the last LCP, fsm_Down all NCPs * If it's the last NCP, fsm_Close all LCPs */ struct bundle *bundle = (struct bundle *)v; struct datalink *dl; if (fp->proto == PROTO_IPCP) { if (bundle_Phase(bundle) != PHASE_DEAD) bundle_NewPhase(bundle, PHASE_TERMINATE); for (dl = bundle->links; dl; dl = dl->next) datalink_Close(dl, 0); fsm_Down(fp); fsm_Close(fp); } else if (fp->proto == PROTO_LCP) { int others_active; others_active = 0; for (dl = bundle->links; dl; dl = dl->next) if (fp != &dl->physical->link.lcp.fsm && dl->state != DATALINK_CLOSED && dl->state != DATALINK_HANGUP) others_active++; if (!others_active) { fsm_Down(&bundle->ncp.ipcp.fsm); fsm_Close(&bundle->ncp.ipcp.fsm); /* ST_INITIAL please */ } } } int bundle_LinkIsUp(const struct bundle *bundle) { return bundle->ncp.ipcp.fsm.state == ST_OPENED; } void bundle_Close(struct bundle *bundle, const char *name, int staydown) { /* * Please close the given datalink. * If name == NULL or name is the last datalink, fsm_Close all NCPs * (except our MP) * If it isn't the last datalink, just Close that datalink. */ struct datalink *dl, *this_dl; int others_active; if (bundle->phase == PHASE_TERMINATE || bundle->phase == PHASE_DEAD) return; others_active = 0; this_dl = NULL; for (dl = bundle->links; dl; dl = dl->next) { if (name && !strcasecmp(name, dl->name)) this_dl = dl; if (name == NULL || this_dl == dl) { if (staydown) datalink_StayDown(dl); } else if (dl->state != DATALINK_CLOSED && dl->state != DATALINK_HANGUP) others_active++; } if (name && this_dl == NULL) { log_Printf(LogWARN, "%s: Invalid datalink name\n", name); return; } if (!others_active) { bundle_StopIdleTimer(bundle); bundle_StopAutoLoadTimer(bundle); if (bundle->ncp.ipcp.fsm.state > ST_CLOSED || bundle->ncp.ipcp.fsm.state == ST_STARTING) fsm_Close(&bundle->ncp.ipcp.fsm); else { if (bundle->ncp.ipcp.fsm.state > ST_INITIAL) { fsm_Close(&bundle->ncp.ipcp.fsm); fsm_Down(&bundle->ncp.ipcp.fsm); } for (dl = bundle->links; dl; dl = dl->next) datalink_Close(dl, staydown); } } else if (this_dl && this_dl->state != DATALINK_CLOSED && this_dl->state != DATALINK_HANGUP) datalink_Close(this_dl, staydown); } void bundle_Down(struct bundle *bundle) { struct datalink *dl; for (dl = bundle->links; dl; dl = dl->next) datalink_Down(dl, 1); } static int bundle_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n) { struct bundle *bundle = descriptor2bundle(d); struct datalink *dl; int result, want, queued, nlinks; result = 0; for (dl = bundle->links; dl; dl = dl->next) result += descriptor_UpdateSet(&dl->desc, r, w, e, n); /* If there are aren't many packets queued, look for some more. */ for (nlinks = 0, dl = bundle->links; dl; dl = dl->next) nlinks++; if (nlinks) { queued = r ? bundle_FillQueues(bundle) : ip_QueueLen(); if (bundle->autoload.running) { if (queued < bundle->cfg.autoload.max.packets) { if (queued > bundle->cfg.autoload.min.packets) bundle_StopAutoLoadTimer(bundle); else if (bundle->autoload.timer.state != TIMER_RUNNING || bundle->autoload.comingup) bundle_StartAutoLoadTimer(bundle, 0); } else if (bundle->autoload.timer.state != TIMER_RUNNING || !bundle->autoload.comingup) bundle_StartAutoLoadTimer(bundle, 1); } if (r && (bundle->phase == PHASE_NETWORK || bundle->phys_type & PHYS_AUTO)) { /* enough surplus so that we can tell if we're getting swamped */ want = bundle->cfg.autoload.max.packets + nlinks * 2; /* but at least 20 packets ! */ if (want < 20) want = 20; if (queued < want) { /* Not enough - select() for more */ FD_SET(bundle->dev.fd, r); if (*n < bundle->dev.fd + 1) *n = bundle->dev.fd + 1; log_Printf(LogTIMER, "%s: fdset(r) %d\n", TUN_NAME, bundle->dev.fd); result++; } } } /* * This *MUST* be called after the datalink UpdateSet()s as it * might be ``holding'' one of the datalinks (death-row) and * wants to be able to de-select() it from the descriptor set. */ result += descriptor_UpdateSet(&bundle->ncp.mp.server.desc, r, w, e, n); return result; } static int bundle_IsSet(struct descriptor *d, const fd_set *fdset) { struct bundle *bundle = descriptor2bundle(d); struct datalink *dl; for (dl = bundle->links; dl; dl = dl->next) if (descriptor_IsSet(&dl->desc, fdset)) return 1; if (descriptor_IsSet(&bundle->ncp.mp.server.desc, fdset)) return 1; return FD_ISSET(bundle->dev.fd, fdset); } static void bundle_DescriptorRead(struct descriptor *d, struct bundle *bundle, const fd_set *fdset) { struct datalink *dl; if (descriptor_IsSet(&bundle->ncp.mp.server.desc, fdset)) descriptor_Read(&bundle->ncp.mp.server.desc, bundle, fdset); for (dl = bundle->links; dl; dl = dl->next) if (descriptor_IsSet(&dl->desc, fdset)) descriptor_Read(&dl->desc, bundle, fdset); if (FD_ISSET(bundle->dev.fd, fdset)) { struct tun_data tun; int n, pri; /* something to read from tun */ n = read(bundle->dev.fd, &tun, sizeof tun); if (n < 0) { log_Printf(LogERROR, "read from %s: %s\n", TUN_NAME, strerror(errno)); return; } n -= sizeof tun - sizeof tun.data; if (n <= 0) { log_Printf(LogERROR, "read from %s: Only %d bytes read\n", TUN_NAME, n); return; } if (!tun_check_header(tun, AF_INET)) return; if (((struct ip *)tun.data)->ip_dst.s_addr == bundle->ncp.ipcp.my_ip.s_addr) { /* we've been asked to send something addressed *to* us :( */ if (Enabled(bundle, OPT_LOOPBACK)) { pri = PacketCheck(bundle, tun.data, n, &bundle->filter.in); if (pri >= 0) { struct mbuf *bp; #ifndef NOALIAS if (alias_IsEnabled()) { (*PacketAlias.In)(tun.data, sizeof tun.data); n = ntohs(((struct ip *)tun.data)->ip_len); } #endif bp = mbuf_Alloc(n, MB_IPIN); memcpy(MBUF_CTOP(bp), tun.data, n); ip_Input(bundle, bp); log_Printf(LogDEBUG, "Looped back packet addressed to myself\n"); } return; } else log_Printf(LogDEBUG, "Oops - forwarding packet addressed to myself\n"); } /* * Process on-demand dialup. Output packets are queued within tunnel * device until IPCP is opened. */ if (bundle_Phase(bundle) == PHASE_DEAD) { /* * Note, we must be in AUTO mode :-/ otherwise our interface should * *not* be UP and we can't receive data */ if ((pri = PacketCheck(bundle, tun.data, n, &bundle->filter.dial)) >= 0) bundle_Open(bundle, NULL, PHYS_AUTO); else /* * Drop the packet. If we were to queue it, we'd just end up with * a pile of timed-out data in our output queue by the time we get * around to actually dialing. We'd also prematurely reach the * threshold at which we stop select()ing to read() the tun * device - breaking auto-dial. */ return; } pri = PacketCheck(bundle, tun.data, n, &bundle->filter.out); if (pri >= 0) { #ifndef NOALIAS if (alias_IsEnabled()) { (*PacketAlias.Out)(tun.data, sizeof tun.data); n = ntohs(((struct ip *)tun.data)->ip_len); } #endif ip_Enqueue(pri, tun.data, n); } } } static void bundle_DescriptorWrite(struct descriptor *d, struct bundle *bundle, const fd_set *fdset) { struct datalink *dl; /* This is not actually necessary as struct mpserver doesn't Write() */ if (descriptor_IsSet(&bundle->ncp.mp.server.desc, fdset)) descriptor_Write(&bundle->ncp.mp.server.desc, bundle, fdset); for (dl = bundle->links; dl; dl = dl->next) if (descriptor_IsSet(&dl->desc, fdset)) descriptor_Write(&dl->desc, bundle, fdset); } static void bundle_LockTun(struct bundle *bundle) { FILE *lockfile; char pidfile[MAXPATHLEN]; snprintf(pidfile, sizeof pidfile, "%stun%d.pid", _PATH_VARRUN, bundle->unit); lockfile = ID0fopen(pidfile, "w"); if (lockfile != NULL) { fprintf(lockfile, "%d\n", (int)getpid()); fclose(lockfile); } #ifndef RELEASE_CRUNCH else log_Printf(LogERROR, "Warning: Can't create %s: %s\n", pidfile, strerror(errno)); #endif } static void bundle_UnlockTun(struct bundle *bundle) { char pidfile[MAXPATHLEN]; snprintf(pidfile, sizeof pidfile, "%stun%d.pid", _PATH_VARRUN, bundle->unit); ID0unlink(pidfile); } struct bundle * bundle_Create(const char *prefix, int type, const char **argv) { int s, enoentcount, err; struct ifreq ifrq; static struct bundle bundle; /* there can be only one */ if (bundle.ifp.Name != NULL) { /* Already allocated ! */ log_Printf(LogERROR, "bundle_Create: There's only one BUNDLE !\n"); return NULL; } err = ENOENT; enoentcount = 0; for (bundle.unit = 0; ; bundle.unit++) { snprintf(bundle.dev.Name, sizeof bundle.dev.Name, "%s%d", prefix, bundle.unit); bundle.dev.fd = ID0open(bundle.dev.Name, O_RDWR); if (bundle.dev.fd >= 0) break; else if (errno == ENXIO) { err = errno; break; } else if (errno == ENOENT) { if (++enoentcount > 2) break; } else err = errno; } if (bundle.dev.fd < 0) { log_Printf(LogWARN, "No available tunnel devices found (%s).\n", strerror(err)); return NULL; } log_SetTun(bundle.unit); bundle.argv = argv; s = socket(AF_INET, SOCK_DGRAM, 0); if (s < 0) { log_Printf(LogERROR, "bundle_Create: socket(): %s\n", strerror(errno)); close(bundle.dev.fd); return NULL; } bundle.ifp.Name = strrchr(bundle.dev.Name, '/'); if (bundle.ifp.Name == NULL) bundle.ifp.Name = bundle.dev.Name; else bundle.ifp.Name++; /* * Now, bring up the interface. */ memset(&ifrq, '\0', sizeof ifrq); strncpy(ifrq.ifr_name, bundle.ifp.Name, sizeof ifrq.ifr_name - 1); ifrq.ifr_name[sizeof ifrq.ifr_name - 1] = '\0'; if (ID0ioctl(s, SIOCGIFFLAGS, &ifrq) < 0) { log_Printf(LogERROR, "OpenTunnel: ioctl(SIOCGIFFLAGS): %s\n", strerror(errno)); close(s); close(bundle.dev.fd); bundle.ifp.Name = NULL; return NULL; } ifrq.ifr_flags |= IFF_UP; if (ID0ioctl(s, SIOCSIFFLAGS, &ifrq) < 0) { log_Printf(LogERROR, "OpenTunnel: ioctl(SIOCSIFFLAGS): %s\n", strerror(errno)); close(s); close(bundle.dev.fd); bundle.ifp.Name = NULL; return NULL; } close(s); if ((bundle.ifp.Index = GetIfIndex(bundle.ifp.Name)) < 0) { log_Printf(LogERROR, "OpenTunnel: Can't find interface index.\n"); close(bundle.dev.fd); bundle.ifp.Name = NULL; return NULL; } log_Printf(LogPHASE, "Using interface: %s\n", bundle.ifp.Name); bundle.ifp.Speed = 0; bundle.routing_seq = 0; bundle.phase = PHASE_DEAD; bundle.CleaningUp = 0; bundle.fsm.LayerStart = bundle_LayerStart; bundle.fsm.LayerUp = bundle_LayerUp; bundle.fsm.LayerDown = bundle_LayerDown; bundle.fsm.LayerFinish = bundle_LayerFinish; bundle.fsm.object = &bundle; bundle.cfg.idle_timeout = NCP_IDLE_TIMEOUT; *bundle.cfg.auth.name = '\0'; *bundle.cfg.auth.key = '\0'; bundle.cfg.opt = OPT_SROUTES | OPT_IDCHECK | OPT_LOOPBACK | OPT_THROUGHPUT | OPT_UTMP; *bundle.cfg.label = '\0'; bundle.cfg.mtu = DEF_MTU; bundle.cfg.autoload.max.packets = 0; bundle.cfg.autoload.max.timeout = 0; bundle.cfg.autoload.min.packets = 0; bundle.cfg.autoload.min.timeout = 0; bundle.phys_type = type; bundle.links = datalink_Create("deflink", &bundle, type); if (bundle.links == NULL) { log_Printf(LogERROR, "Cannot create data link: %s\n", strerror(errno)); close(bundle.dev.fd); bundle.ifp.Name = NULL; return NULL; } bundle.desc.type = BUNDLE_DESCRIPTOR; bundle.desc.UpdateSet = bundle_UpdateSet; bundle.desc.IsSet = bundle_IsSet; bundle.desc.Read = bundle_DescriptorRead; bundle.desc.Write = bundle_DescriptorWrite; mp_Init(&bundle.ncp.mp, &bundle); /* Send over the first physical link by default */ ipcp_Init(&bundle.ncp.ipcp, &bundle, &bundle.links->physical->link, &bundle.fsm); memset(&bundle.filter, '\0', sizeof bundle.filter); bundle.filter.in.fragok = bundle.filter.in.logok = 1; bundle.filter.in.name = "IN"; bundle.filter.out.fragok = bundle.filter.out.logok = 1; bundle.filter.out.name = "OUT"; bundle.filter.dial.name = "DIAL"; bundle.filter.dial.logok = 1; bundle.filter.alive.name = "ALIVE"; bundle.filter.alive.logok = 1; memset(&bundle.idle.timer, '\0', sizeof bundle.idle.timer); bundle.idle.done = 0; bundle.notify.fd = -1; memset(&bundle.autoload.timer, '\0', sizeof bundle.autoload.timer); bundle.autoload.done = 0; bundle.autoload.running = 0; /* Clean out any leftover crud */ bundle_CleanInterface(&bundle); bundle_LockTun(&bundle); return &bundle; } static void bundle_DownInterface(struct bundle *bundle) { struct ifreq ifrq; int s; route_IfDelete(bundle, 1); s = ID0socket(AF_INET, SOCK_DGRAM, 0); if (s < 0) { log_Printf(LogERROR, "bundle_DownInterface: socket: %s\n", strerror(errno)); return; } memset(&ifrq, '\0', sizeof ifrq); strncpy(ifrq.ifr_name, bundle->ifp.Name, sizeof ifrq.ifr_name - 1); ifrq.ifr_name[sizeof ifrq.ifr_name - 1] = '\0'; if (ID0ioctl(s, SIOCGIFFLAGS, &ifrq) < 0) { log_Printf(LogERROR, "bundle_DownInterface: ioctl(SIOCGIFFLAGS): %s\n", strerror(errno)); close(s); return; } ifrq.ifr_flags &= ~IFF_UP; if (ID0ioctl(s, SIOCSIFFLAGS, &ifrq) < 0) { log_Printf(LogERROR, "bundle_DownInterface: ioctl(SIOCSIFFLAGS): %s\n", strerror(errno)); close(s); return; } close(s); } void bundle_Destroy(struct bundle *bundle) { struct datalink *dl; /* * Clean up the interface. We don't need to timer_Stop()s, mp_Down(), * ipcp_CleanInterface() and bundle_DownInterface() unless we're getting * out under exceptional conditions such as a descriptor exception. */ timer_Stop(&bundle->idle.timer); timer_Stop(&bundle->autoload.timer); mp_Down(&bundle->ncp.mp); ipcp_CleanInterface(&bundle->ncp.ipcp); bundle_DownInterface(bundle); /* Again, these are all DATALINK_CLOSED unless we're abending */ dl = bundle->links; while (dl) dl = datalink_Destroy(dl); close(bundle->dev.fd); bundle_UnlockTun(bundle); /* In case we never made PHASE_NETWORK */ bundle_Notify(bundle, EX_ERRDEAD); bundle->ifp.Name = NULL; } struct rtmsg { struct rt_msghdr m_rtm; char m_space[64]; }; int bundle_SetRoute(struct bundle *bundle, int cmd, struct in_addr dst, struct in_addr gateway, struct in_addr mask, int bang) { struct rtmsg rtmes; int s, nb, wb; char *cp; const char *cmdstr; struct sockaddr_in rtdata; int result = 1; if (bang) cmdstr = (cmd == RTM_ADD ? "Add!" : "Delete!"); else cmdstr = (cmd == RTM_ADD ? "Add" : "Delete"); s = ID0socket(PF_ROUTE, SOCK_RAW, 0); if (s < 0) { log_Printf(LogERROR, "bundle_SetRoute: socket(): %s\n", strerror(errno)); return result; } memset(&rtmes, '\0', sizeof rtmes); rtmes.m_rtm.rtm_version = RTM_VERSION; rtmes.m_rtm.rtm_type = cmd; rtmes.m_rtm.rtm_addrs = RTA_DST; rtmes.m_rtm.rtm_seq = ++bundle->routing_seq; rtmes.m_rtm.rtm_pid = getpid(); rtmes.m_rtm.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC; memset(&rtdata, '\0', sizeof rtdata); rtdata.sin_len = sizeof rtdata; rtdata.sin_family = AF_INET; rtdata.sin_port = 0; rtdata.sin_addr = dst; cp = rtmes.m_space; memcpy(cp, &rtdata, rtdata.sin_len); cp += rtdata.sin_len; if (cmd == RTM_ADD) { if (gateway.s_addr == INADDR_ANY) { /* Add a route through the interface */ struct sockaddr_dl dl; const char *iname; int ilen; iname = Index2Nam(bundle->ifp.Index); ilen = strlen(iname); dl.sdl_len = sizeof dl - sizeof dl.sdl_data + ilen; dl.sdl_family = AF_LINK; dl.sdl_index = bundle->ifp.Index; dl.sdl_type = 0; dl.sdl_nlen = ilen; dl.sdl_alen = 0; dl.sdl_slen = 0; strncpy(dl.sdl_data, iname, sizeof dl.sdl_data); memcpy(cp, &dl, dl.sdl_len); cp += dl.sdl_len; rtmes.m_rtm.rtm_addrs |= RTA_GATEWAY; } else { rtdata.sin_addr = gateway; memcpy(cp, &rtdata, rtdata.sin_len); cp += rtdata.sin_len; rtmes.m_rtm.rtm_addrs |= RTA_GATEWAY; } } if (dst.s_addr == INADDR_ANY) mask.s_addr = INADDR_ANY; if (cmd == RTM_ADD || dst.s_addr == INADDR_ANY) { rtdata.sin_addr = mask; memcpy(cp, &rtdata, rtdata.sin_len); cp += rtdata.sin_len; rtmes.m_rtm.rtm_addrs |= RTA_NETMASK; } nb = cp - (char *) &rtmes; rtmes.m_rtm.rtm_msglen = nb; wb = ID0write(s, &rtmes, nb); if (wb < 0) { log_Printf(LogTCPIP, "bundle_SetRoute failure:\n"); log_Printf(LogTCPIP, "bundle_SetRoute: Cmd = %s\n", cmdstr); log_Printf(LogTCPIP, "bundle_SetRoute: Dst = %s\n", inet_ntoa(dst)); log_Printf(LogTCPIP, "bundle_SetRoute: Gateway = %s\n", inet_ntoa(gateway)); log_Printf(LogTCPIP, "bundle_SetRoute: Mask = %s\n", inet_ntoa(mask)); failed: if (cmd == RTM_ADD && (rtmes.m_rtm.rtm_errno == EEXIST || (rtmes.m_rtm.rtm_errno == 0 && errno == EEXIST))) { if (!bang) { log_Printf(LogWARN, "Add route failed: %s already exists\n", inet_ntoa(dst)); result = 0; /* Don't add to our dynamic list */ } else { rtmes.m_rtm.rtm_type = cmd = RTM_CHANGE; if ((wb = ID0write(s, &rtmes, nb)) < 0) goto failed; } } else if (cmd == RTM_DELETE && (rtmes.m_rtm.rtm_errno == ESRCH || (rtmes.m_rtm.rtm_errno == 0 && errno == ESRCH))) { if (!bang) log_Printf(LogWARN, "Del route failed: %s: Non-existent\n", inet_ntoa(dst)); } else if (rtmes.m_rtm.rtm_errno == 0) log_Printf(LogWARN, "%s route failed: %s: errno: %s\n", cmdstr, inet_ntoa(dst), strerror(errno)); else log_Printf(LogWARN, "%s route failed: %s: %s\n", cmdstr, inet_ntoa(dst), strerror(rtmes.m_rtm.rtm_errno)); } log_Printf(LogDEBUG, "wrote %d: cmd = %s, dst = %x, gateway = %x\n", wb, cmdstr, (unsigned)dst.s_addr, (unsigned)gateway.s_addr); close(s); return result; } void bundle_LinkClosed(struct bundle *bundle, struct datalink *dl) { /* * Our datalink has closed. * CleanDatalinks() (called from DoLoop()) will remove closed * BACKGROUND and DIRECT links. * If it's the last data link, enter phase DEAD. * * NOTE: dl may not be in our list (bundle_SendDatalink()) ! */ struct datalink *odl; int other_links; other_links = 0; for (odl = bundle->links; odl; odl = odl->next) if (odl != dl && odl->state != DATALINK_CLOSED) other_links++; if (!other_links) { if (dl->physical->type != PHYS_AUTO) /* Not in -auto mode */ bundle_DownInterface(bundle); if (bundle->ncp.ipcp.fsm.state > ST_CLOSED || bundle->ncp.ipcp.fsm.state == ST_STARTING) { fsm_Down(&bundle->ncp.ipcp.fsm); fsm_Close(&bundle->ncp.ipcp.fsm); /* ST_INITIAL please */ } bundle_NewPhase(bundle, PHASE_DEAD); bundle_StopIdleTimer(bundle); bundle_StopAutoLoadTimer(bundle); bundle->autoload.running = 0; } else bundle->autoload.running = 1; } void bundle_Open(struct bundle *bundle, const char *name, int mask) { /* * Please open the given datalink, or all if name == NULL */ struct datalink *dl; timer_Stop(&bundle->autoload.timer); for (dl = bundle->links; dl; dl = dl->next) if (name == NULL || !strcasecmp(dl->name, name)) { if (dl->state == DATALINK_CLOSED && (mask & dl->physical->type)) { datalink_Up(dl, 1, 1); if (mask == PHYS_AUTO) /* Only one AUTO link at a time (see the AutoLoad timer) */ break; } if (name != NULL) break; } } struct datalink * bundle2datalink(struct bundle *bundle, const char *name) { struct datalink *dl; if (name != NULL) { for (dl = bundle->links; dl; dl = dl->next) if (!strcasecmp(dl->name, name)) return dl; } else if (bundle->links && !bundle->links->next) return bundle->links; return NULL; } int bundle_FillQueues(struct bundle *bundle) { int total; if (bundle->ncp.mp.active) total = mp_FillQueues(bundle); else { struct datalink *dl; int add; for (total = 0, dl = bundle->links; dl; dl = dl->next) if (dl->state == DATALINK_OPEN) { add = link_QueueLen(&dl->physical->link); if (add == 0 && dl->physical->out == NULL) add = ip_FlushPacket(&dl->physical->link, bundle); total += add; } } return total + ip_QueueLen(); } int bundle_ShowLinks(struct cmdargs const *arg) { struct datalink *dl; for (dl = arg->bundle->links; dl; dl = dl->next) { prompt_Printf(arg->prompt, "Name: %s [%s, %s]", dl->name, mode2Nam(dl->physical->type), datalink_State(dl)); if (dl->physical->link.throughput.rolling && dl->state == DATALINK_OPEN) prompt_Printf(arg->prompt, " weight %d, %d bytes/sec", dl->mp.weight, dl->physical->link.throughput.OctetsPerSecond); prompt_Printf(arg->prompt, "\n"); } return 0; } static const char * optval(struct bundle *bundle, int bit) { return (bundle->cfg.opt & bit) ? "enabled" : "disabled"; } int bundle_ShowStatus(struct cmdargs const *arg) { int remaining; prompt_Printf(arg->prompt, "Phase %s\n", bundle_PhaseName(arg->bundle)); prompt_Printf(arg->prompt, " Device: %s\n", arg->bundle->dev.Name); prompt_Printf(arg->prompt, " Interface: %s @ %lubps\n", arg->bundle->ifp.Name, arg->bundle->ifp.Speed); prompt_Printf(arg->prompt, "\nDefaults:\n"); prompt_Printf(arg->prompt, " Label: %s\n", arg->bundle->cfg.label); prompt_Printf(arg->prompt, " Auth name: %s\n", arg->bundle->cfg.auth.name); prompt_Printf(arg->prompt, " Auto Load: Up after %ds of >= %d packets\n", arg->bundle->cfg.autoload.max.timeout, arg->bundle->cfg.autoload.max.packets); prompt_Printf(arg->prompt, " Down after %ds of <= %d" " packets\n", arg->bundle->cfg.autoload.min.timeout, arg->bundle->cfg.autoload.min.packets); if (arg->bundle->autoload.timer.state == TIMER_RUNNING) prompt_Printf(arg->prompt, " %ds remaining 'till " "a link comes %s\n", bundle_RemainingAutoLoadTime(arg->bundle), arg->bundle->autoload.comingup ? "up" : "down"); else prompt_Printf(arg->prompt, " %srunning with %d" " packets queued\n", arg->bundle->autoload.running ? "" : "not ", ip_QueueLen()); prompt_Printf(arg->prompt, " Idle Timer: "); if (arg->bundle->cfg.idle_timeout) { prompt_Printf(arg->prompt, "%ds", arg->bundle->cfg.idle_timeout); remaining = bundle_RemainingIdleTime(arg->bundle); if (remaining != -1) prompt_Printf(arg->prompt, " (%ds remaining)", remaining); prompt_Printf(arg->prompt, "\n"); } else prompt_Printf(arg->prompt, "disabled\n"); prompt_Printf(arg->prompt, " MTU: "); if (arg->bundle->cfg.mtu) prompt_Printf(arg->prompt, "%d\n", arg->bundle->cfg.mtu); else prompt_Printf(arg->prompt, "unspecified\n"); prompt_Printf(arg->prompt, " Sticky Routes: %s\n", optval(arg->bundle, OPT_SROUTES)); prompt_Printf(arg->prompt, " ID check: %s\n", optval(arg->bundle, OPT_IDCHECK)); prompt_Printf(arg->prompt, " Loopback: %s\n", optval(arg->bundle, OPT_LOOPBACK)); prompt_Printf(arg->prompt, " PasswdAuth: %s\n", optval(arg->bundle, OPT_PASSWDAUTH)); prompt_Printf(arg->prompt, " Proxy: %s\n", optval(arg->bundle, OPT_PROXY)); prompt_Printf(arg->prompt, " Throughput: %s\n", optval(arg->bundle, OPT_THROUGHPUT)); prompt_Printf(arg->prompt, " Utmp Logging: %s\n", optval(arg->bundle, OPT_UTMP)); return 0; } static void bundle_IdleTimeout(void *v) { struct bundle *bundle = (struct bundle *)v; log_Printf(LogPHASE, "Idle timer expired.\n"); bundle_StopIdleTimer(bundle); bundle_Close(bundle, NULL, 1); } /* * Start Idle timer. If timeout is reached, we call bundle_Close() to * close LCP and link. */ void bundle_StartIdleTimer(struct bundle *bundle) { timer_Stop(&bundle->idle.timer); if ((bundle->phys_type & (PHYS_DEDICATED|PHYS_DDIAL)) != bundle->phys_type && bundle->cfg.idle_timeout) { bundle->idle.timer.func = bundle_IdleTimeout; bundle->idle.timer.name = "idle"; bundle->idle.timer.load = bundle->cfg.idle_timeout * SECTICKS; bundle->idle.timer.arg = bundle; timer_Start(&bundle->idle.timer); bundle->idle.done = time(NULL) + bundle->cfg.idle_timeout; } } void bundle_SetIdleTimer(struct bundle *bundle, int value) { bundle->cfg.idle_timeout = value; if (bundle_LinkIsUp(bundle)) bundle_StartIdleTimer(bundle); } void bundle_StopIdleTimer(struct bundle *bundle) { timer_Stop(&bundle->idle.timer); bundle->idle.done = 0; } static int bundle_RemainingIdleTime(struct bundle *bundle) { if (bundle->idle.done) return bundle->idle.done - time(NULL); return -1; } int bundle_IsDead(struct bundle *bundle) { return !bundle->links || (bundle->phase == PHASE_DEAD && bundle->CleaningUp); } static void bundle_LinkAdded(struct bundle *bundle, struct datalink *dl) { bundle->phys_type |= dl->physical->type; if (dl->physical->type == PHYS_AUTO && bundle->autoload.timer.state == TIMER_STOPPED && bundle->phase == PHASE_NETWORK) bundle->autoload.running = 1; } static void bundle_LinksRemoved(struct bundle *bundle) { struct datalink *dl; bundle->phys_type = 0; for (dl = bundle->links; dl; dl = dl->next) bundle_LinkAdded(bundle, dl); if ((bundle->phys_type & (PHYS_DEDICATED|PHYS_DDIAL)) == bundle->phys_type) timer_Stop(&bundle->idle.timer); } static struct datalink * bundle_DatalinkLinkout(struct bundle *bundle, struct datalink *dl) { struct datalink **dlp; for (dlp = &bundle->links; *dlp; dlp = &(*dlp)->next) if (*dlp == dl) { *dlp = dl->next; dl->next = NULL; bundle_LinksRemoved(bundle); return dl; } return NULL; } static void bundle_DatalinkLinkin(struct bundle *bundle, struct datalink *dl) { struct datalink **dlp = &bundle->links; while (*dlp) dlp = &(*dlp)->next; *dlp = dl; dl->next = NULL; bundle_LinkAdded(bundle, dl); } void bundle_CleanDatalinks(struct bundle *bundle) { struct datalink **dlp = &bundle->links; int found = 0; while (*dlp) if ((*dlp)->state == DATALINK_CLOSED && (*dlp)->physical->type & (PHYS_DIRECT|PHYS_BACKGROUND)) { *dlp = datalink_Destroy(*dlp); found++; } else dlp = &(*dlp)->next; if (found) bundle_LinksRemoved(bundle); } int bundle_DatalinkClone(struct bundle *bundle, struct datalink *dl, const char *name) { if (bundle2datalink(bundle, name)) { log_Printf(LogWARN, "Clone: %s: name already exists\n", name); return 0; } bundle_DatalinkLinkin(bundle, datalink_Clone(dl, name)); return 1; } void bundle_DatalinkRemove(struct bundle *bundle, struct datalink *dl) { dl = bundle_DatalinkLinkout(bundle, dl); if (dl) datalink_Destroy(dl); } void bundle_SetLabel(struct bundle *bundle, const char *label) { if (label) strncpy(bundle->cfg.label, label, sizeof bundle->cfg.label - 1); else *bundle->cfg.label = '\0'; } const char * bundle_GetLabel(struct bundle *bundle) { return *bundle->cfg.label ? bundle->cfg.label : NULL; } void bundle_ReceiveDatalink(struct bundle *bundle, int s, struct sockaddr_un *sun) { char cmsgbuf[sizeof(struct cmsghdr) + sizeof(int)]; struct cmsghdr *cmsg = (struct cmsghdr *)cmsgbuf; struct msghdr msg; struct iovec iov[SCATTER_SEGMENTS]; struct datalink *dl; int niov, link_fd, expect, f; pid_t pid; log_Printf(LogPHASE, "Receiving datalink\n"); /* Create our scatter/gather array */ niov = 1; iov[0].iov_len = strlen(Version) + 1; iov[0].iov_base = (char *)malloc(iov[0].iov_len); if (datalink2iov(NULL, iov, &niov, sizeof iov / sizeof *iov, 0) == -1) { close(s); return; } pid = getpid(); write(s, &pid, sizeof pid); for (f = expect = 0; f < niov; f++) expect += iov[f].iov_len; /* Set up our message */ cmsg->cmsg_len = sizeof cmsgbuf; cmsg->cmsg_level = SOL_SOCKET; cmsg->cmsg_type = 0; memset(&msg, '\0', sizeof msg); msg.msg_name = (caddr_t)sun; msg.msg_namelen = sizeof *sun; msg.msg_iov = iov; msg.msg_iovlen = niov; msg.msg_control = cmsgbuf; msg.msg_controllen = sizeof cmsgbuf; log_Printf(LogDEBUG, "Expecting %d scatter/gather bytes\n", expect); f = expect + 100; setsockopt(s, SOL_SOCKET, SO_RCVBUF, &f, sizeof f); if ((f = recvmsg(s, &msg, MSG_WAITALL)) != expect) { if (f == -1) log_Printf(LogERROR, "Failed recvmsg: %s\n", strerror(errno)); else log_Printf(LogERROR, "Failed recvmsg: Got %d, not %d\n", f, expect); while (niov--) free(iov[niov].iov_base); close(s); return; } write(s, "!", 1); /* ACK */ if (cmsg->cmsg_type == SCM_RIGHTS) { /* We've successfully received an open file descriptor through our socket */ log_Printf(LogDEBUG, "Receiving non-tty device\n"); link_fd = *(int *)CMSG_DATA(cmsg); } else { /* It's a ``controlling'' tty device via CATPROG */ log_Printf(LogDEBUG, "Receiving tty device\n"); link_fd = dup(s); fcntl(link_fd, F_SETFL, fcntl(link_fd, F_GETFL, 0) | O_NONBLOCK); } if (strncmp(Version, iov[0].iov_base, iov[0].iov_len)) { log_Printf(LogWARN, "Cannot receive datalink, incorrect version" " (\"%.*s\", not \"%s\")\n", (int)iov[0].iov_len, iov[0].iov_base, Version); close(link_fd); while (niov--) free(iov[niov].iov_base); return; } niov = 1; dl = iov2datalink(bundle, iov, &niov, sizeof iov / sizeof *iov, link_fd); if (dl) { bundle_DatalinkLinkin(bundle, dl); datalink_AuthOk(dl); } else close(link_fd); free(iov[0].iov_base); close(s); } void bundle_SendDatalink(struct datalink *dl, int s, struct sockaddr_un *sun) { char cmsgbuf[sizeof(struct cmsghdr) + sizeof(int)], ack; struct cmsghdr *cmsg = (struct cmsghdr *)cmsgbuf; struct msghdr msg; struct iovec iov[SCATTER_SEGMENTS]; int niov, link_fd, f, expect, newsid; pid_t newpid; log_Printf(LogPHASE, "Transmitting datalink %s\n", dl->name); bundle_LinkClosed(dl->bundle, dl); bundle_DatalinkLinkout(dl->bundle, dl); /* Build our scatter/gather array */ iov[0].iov_len = strlen(Version) + 1; iov[0].iov_base = strdup(Version); niov = 1; read(s, &newpid, sizeof newpid); link_fd = datalink2iov(dl, iov, &niov, sizeof iov / sizeof *iov, newpid); if (link_fd != -1) { memset(&msg, '\0', sizeof msg); msg.msg_name = (caddr_t)sun; msg.msg_namelen = sizeof *sun; msg.msg_iov = iov; msg.msg_iovlen = niov; cmsg->cmsg_len = sizeof cmsgbuf; cmsg->cmsg_level = SOL_SOCKET; cmsg->cmsg_type = SCM_RIGHTS; *(int *)CMSG_DATA(cmsg) = link_fd; msg.msg_control = cmsgbuf; msg.msg_controllen = sizeof cmsgbuf; for (f = expect = 0; f < niov; f++) expect += iov[f].iov_len; log_Printf(LogDEBUG, "Sending %d bytes in scatter/gather array\n", expect); f = expect + SOCKET_OVERHEAD; setsockopt(s, SOL_SOCKET, SO_SNDBUF, &f, sizeof f); if (sendmsg(s, &msg, 0) == -1) log_Printf(LogERROR, "Failed sendmsg: %s\n", strerror(errno)); /* We must get the ACK before closing the descriptor ! */ read(s, &ack, 1); newsid = tcgetpgrp(link_fd) == getpgrp(); close(link_fd); if (newsid) bundle_setsid(dl->bundle, 1); } close(s); while (niov--) free(iov[niov].iov_base); } int bundle_RenameDatalink(struct bundle *bundle, struct datalink *ndl, const char *name) { struct datalink *dl; if (!strcasecmp(ndl->name, name)) return 1; for (dl = bundle->links; dl; dl = dl->next) if (!strcasecmp(dl->name, name)) return 0; datalink_Rename(ndl, name); return 1; } int bundle_SetMode(struct bundle *bundle, struct datalink *dl, int mode) { int omode; omode = dl->physical->type; if (omode == mode) return 1; if (mode == PHYS_AUTO && !(bundle->phys_type & PHYS_AUTO)) /* Changing to demand-dial mode */ if (bundle->ncp.ipcp.peer_ip.s_addr == INADDR_ANY) { log_Printf(LogWARN, "You must `set ifaddr' before changing mode to %s\n", mode2Nam(mode)); return 0; } if (!datalink_SetMode(dl, mode)) return 0; if (mode == PHYS_AUTO && !(bundle->phys_type & PHYS_AUTO)) ipcp_InterfaceUp(&bundle->ncp.ipcp); /* Regenerate phys_type and adjust autoload & idle timers */ bundle_LinksRemoved(bundle); if (omode == PHYS_AUTO && !(bundle->phys_type & PHYS_AUTO)) /* Changing from demand-dial mode */ ipcp_CleanInterface(&bundle->ncp.ipcp); return 1; } void bundle_setsid(struct bundle *bundle, int holdsession) { /* * Lose the current session. This means getting rid of our pid * too so that the tty device will really go away, and any getty * etc will be allowed to restart. */ pid_t pid, orig; int fds[2]; char done; struct datalink *dl; orig = getpid(); if (pipe(fds) == -1) { log_Printf(LogERROR, "pipe: %s\n", strerror(errno)); return; } switch ((pid = fork())) { case -1: log_Printf(LogERROR, "fork: %s\n", strerror(errno)); close(fds[0]); close(fds[1]); return; case 0: close(fds[0]); read(fds[1], &done, 1); /* uu_locks are mine ! */ close(fds[1]); if (pipe(fds) == -1) { log_Printf(LogERROR, "pipe(2): %s\n", strerror(errno)); return; } switch ((pid = fork())) { case -1: log_Printf(LogERROR, "fork: %s\n", strerror(errno)); close(fds[0]); close(fds[1]); return; case 0: close(fds[0]); bundle_LockTun(bundle); /* update pid */ read(fds[1], &done, 1); /* uu_locks are mine ! */ close(fds[1]); setsid(); log_Printf(LogPHASE, "%d -> %d: %s session control\n", (int)orig, (int)getpid(), holdsession ? "Passed" : "Dropped"); break; default: close(fds[1]); /* Give away all our modem locks (to the final process) */ for (dl = bundle->links; dl; dl = dl->next) if (dl->state != DATALINK_CLOSED) modem_ChangedPid(dl->physical, pid); write(fds[0], "!", 1); /* done */ close(fds[0]); exit(0); break; } break; default: close(fds[1]); /* Give away all our modem locks (to the intermediate process) */ for (dl = bundle->links; dl; dl = dl->next) if (dl->state != DATALINK_CLOSED) modem_ChangedPid(dl->physical, pid); write(fds[0], "!", 1); /* done */ close(fds[0]); if (holdsession) { int fd, status; timer_TermService(); signal(SIGPIPE, SIG_DFL); signal(SIGALRM, SIG_DFL); signal(SIGHUP, SIG_DFL); signal(SIGTERM, SIG_DFL); signal(SIGINT, SIG_DFL); signal(SIGQUIT, SIG_DFL); for (fd = getdtablesize(); fd >= 0; fd--) close(fd); setuid(geteuid()); /* * Reap the intermediate process. As we're not exiting but the * intermediate is, we don't want it to become defunct. */ waitpid(pid, &status, 0); /* Tweak our process arguments.... */ bundle->argv[0] = "session owner"; bundle->argv[1] = NULL; /* * Hang around for a HUP. This should happen as soon as the * ppp that we passed our ctty descriptor to closes it. * NOTE: If this process dies, the passed descriptor becomes * invalid and will give a select() error by setting one * of the error fds, aborting the other ppp. We don't * want that to happen ! */ pause(); } exit(0); break; } }