diff options
Diffstat (limited to 'usr.sbin/ppp/ipcp.c')
| -rw-r--r-- | usr.sbin/ppp/ipcp.c | 1482 |
1 files changed, 1482 insertions, 0 deletions
diff --git a/usr.sbin/ppp/ipcp.c b/usr.sbin/ppp/ipcp.c new file mode 100644 index 000000000000..23f68ad0f7c6 --- /dev/null +++ b/usr.sbin/ppp/ipcp.c @@ -0,0 +1,1482 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> + * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> + * Internet Initiative Japan, Inc (IIJ) + * 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. + */ + +#include <sys/param.h> +#include <netinet/in_systm.h> +#include <netinet/in.h> +#include <netinet/ip.h> +#include <arpa/inet.h> +#include <sys/socket.h> +#include <net/if.h> +#include <net/route.h> +#include <netdb.h> +#include <sys/un.h> + +#include <errno.h> +#include <fcntl.h> +#include <resolv.h> +#include <stdarg.h> +#include <stdlib.h> +#include <string.h> +#include <sys/stat.h> +#include <termios.h> +#include <unistd.h> + +#ifndef NONAT +#ifdef LOCALNAT +#include "alias.h" +#else +#include <alias.h> +#endif +#endif + +#include "layer.h" +#include "ua.h" +#include "defs.h" +#include "command.h" +#include "mbuf.h" +#include "log.h" +#include "timer.h" +#include "fsm.h" +#include "proto.h" +#include "iplist.h" +#include "throughput.h" +#include "slcompress.h" +#include "lqr.h" +#include "hdlc.h" +#include "lcp.h" +#include "ncpaddr.h" +#include "ip.h" +#include "ipcp.h" +#include "filter.h" +#include "descriptor.h" +#include "vjcomp.h" +#include "async.h" +#include "ccp.h" +#include "link.h" +#include "physical.h" +#include "mp.h" +#ifndef NORADIUS +#include "radius.h" +#endif +#include "ipv6cp.h" +#include "ncp.h" +#include "bundle.h" +#include "id.h" +#include "arp.h" +#include "systems.h" +#include "prompt.h" +#include "route.h" +#include "iface.h" + +#undef REJECTED +#define REJECTED(p, x) ((p)->peer_reject & (1<<(x))) +#define issep(ch) ((ch) == ' ' || (ch) == '\t') +#define isip(ch) (((ch) >= '0' && (ch) <= '9') || (ch) == '.') + +struct compreq { + u_short proto; + u_char slots; + u_char compcid; +}; + +static int IpcpLayerUp(struct fsm *); +static void IpcpLayerDown(struct fsm *); +static void IpcpLayerStart(struct fsm *); +static void IpcpLayerFinish(struct fsm *); +static void IpcpInitRestartCounter(struct fsm *, int); +static void IpcpSendConfigReq(struct fsm *); +static void IpcpSentTerminateReq(struct fsm *); +static void IpcpSendTerminateAck(struct fsm *, u_char); +static void IpcpDecodeConfig(struct fsm *, u_char *, u_char *, int, + struct fsm_decode *); + +extern struct libalias *la; + +static struct fsm_callbacks ipcp_Callbacks = { + IpcpLayerUp, + IpcpLayerDown, + IpcpLayerStart, + IpcpLayerFinish, + IpcpInitRestartCounter, + IpcpSendConfigReq, + IpcpSentTerminateReq, + IpcpSendTerminateAck, + IpcpDecodeConfig, + fsm_NullRecvResetReq, + fsm_NullRecvResetAck +}; + +static const char * +protoname(int proto) +{ + static struct { + int id; + const char *txt; + } cftypes[] = { + /* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */ + { 1, "IPADDRS" }, /* IP-Addresses */ /* deprecated */ + { 2, "COMPPROTO" }, /* IP-Compression-Protocol */ + { 3, "IPADDR" }, /* IP-Address */ + { 129, "PRIDNS" }, /* 129: Primary DNS Server Address */ + { 130, "PRINBNS" }, /* 130: Primary NBNS Server Address */ + { 131, "SECDNS" }, /* 131: Secondary DNS Server Address */ + { 132, "SECNBNS" } /* 132: Secondary NBNS Server Address */ + }; + unsigned f; + + for (f = 0; f < sizeof cftypes / sizeof *cftypes; f++) + if (cftypes[f].id == proto) + return cftypes[f].txt; + + return NumStr(proto, NULL, 0); +} + +void +ipcp_AddInOctets(struct ipcp *ipcp, int n) +{ + throughput_addin(&ipcp->throughput, n); +} + +void +ipcp_AddOutOctets(struct ipcp *ipcp, int n) +{ + throughput_addout(&ipcp->throughput, n); +} + +void +ipcp_LoadDNS(struct ipcp *ipcp) +{ + int fd; + + ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr = INADDR_NONE; + + if (ipcp->ns.resolv != NULL) { + free(ipcp->ns.resolv); + ipcp->ns.resolv = NULL; + } + if (ipcp->ns.resolv_nons != NULL) { + free(ipcp->ns.resolv_nons); + ipcp->ns.resolv_nons = NULL; + } + ipcp->ns.resolver = 0; + + if ((fd = open(_PATH_RESCONF, O_RDONLY)) != -1) { + struct stat st; + + if (fstat(fd, &st) == 0) { + ssize_t got; + + /* + * Note, ns.resolv and ns.resolv_nons are assumed to always point to + * buffers of the same size! See the strcpy() below. + */ + if ((ipcp->ns.resolv_nons = (char *)malloc(st.st_size + 1)) == NULL) + log_Printf(LogERROR, "Failed to malloc %lu for %s: %s\n", + (unsigned long)st.st_size, _PATH_RESCONF, strerror(errno)); + else if ((ipcp->ns.resolv = (char *)malloc(st.st_size + 1)) == NULL) { + log_Printf(LogERROR, "Failed(2) to malloc %lu for %s: %s\n", + (unsigned long)st.st_size, _PATH_RESCONF, strerror(errno)); + free(ipcp->ns.resolv_nons); + ipcp->ns.resolv_nons = NULL; + } else if ((got = read(fd, ipcp->ns.resolv, st.st_size)) != st.st_size) { + if (got == -1) + log_Printf(LogERROR, "Failed to read %s: %s\n", + _PATH_RESCONF, strerror(errno)); + else + log_Printf(LogERROR, "Failed to read %s, got %lu not %lu\n", + _PATH_RESCONF, (unsigned long)got, + (unsigned long)st.st_size); + free(ipcp->ns.resolv_nons); + ipcp->ns.resolv_nons = NULL; + free(ipcp->ns.resolv); + ipcp->ns.resolv = NULL; + } else { + char *cp, *cp_nons, *ncp, ch; + int n; + + ipcp->ns.resolv[st.st_size] = '\0'; + ipcp->ns.resolver = 1; + + cp_nons = ipcp->ns.resolv_nons; + cp = ipcp->ns.resolv; + n = 0; + + while ((ncp = strstr(cp, "nameserver")) != NULL) { + if (ncp != cp) { + memcpy(cp_nons, cp, ncp - cp); + cp_nons += ncp - cp; + } + if ((ncp != cp && ncp[-1] != '\n') || !issep(ncp[10])) { + memcpy(cp_nons, ncp, 9); + cp_nons += 9; + cp = ncp + 9; /* Can't match "nameserver" at cp... */ + continue; + } + + for (cp = ncp + 11; issep(*cp); cp++) /* Skip whitespace */ + ; + + for (ncp = cp; isip(*ncp); ncp++) /* Jump over IP */ + ; + + ch = *ncp; + *ncp = '\0'; + if (n < 2 && inet_aton(cp, ipcp->ns.dns)) + n++; + *ncp = ch; + + if ((cp = strchr(ncp, '\n')) == NULL) /* Point at next line */ + cp = ncp + strlen(ncp); + else + cp++; + } + /* + * Note, cp_nons and cp always point to buffers of the same size, so + * strcpy is ok! + */ + strcpy(cp_nons, cp); /* Copy the end - including the NUL */ + cp_nons += strlen(cp_nons) - 1; + while (cp_nons >= ipcp->ns.resolv_nons && *cp_nons == '\n') + *cp_nons-- = '\0'; + if (n == 2 && ipcp->ns.dns[0].s_addr == INADDR_ANY) { + ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr; + ipcp->ns.dns[1].s_addr = INADDR_ANY; + } + bundle_AdjustDNS(ipcp->fsm.bundle); + } + } else + log_Printf(LogERROR, "Failed to stat opened %s: %s\n", + _PATH_RESCONF, strerror(errno)); + + close(fd); + } +} + +int +ipcp_WriteDNS(struct ipcp *ipcp) +{ + const char *paddr; + mode_t mask; + FILE *fp; + + if (ipcp->ns.dns[0].s_addr == INADDR_ANY && + ipcp->ns.dns[1].s_addr == INADDR_ANY) { + log_Printf(LogIPCP, "%s not modified: All nameservers NAKd\n", + _PATH_RESCONF); + return 0; + } + + if (ipcp->ns.dns[0].s_addr == INADDR_ANY) { + ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr; + ipcp->ns.dns[1].s_addr = INADDR_ANY; + } + + mask = umask(022); + if ((fp = ID0fopen(_PATH_RESCONF, "w")) != NULL) { + umask(mask); + if (ipcp->ns.resolv_nons) + fputs(ipcp->ns.resolv_nons, fp); + paddr = inet_ntoa(ipcp->ns.dns[0]); + log_Printf(LogIPCP, "Primary nameserver set to %s\n", paddr); + fprintf(fp, "\nnameserver %s\n", paddr); + if (ipcp->ns.dns[1].s_addr != INADDR_ANY && + ipcp->ns.dns[1].s_addr != INADDR_NONE && + ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr) { + paddr = inet_ntoa(ipcp->ns.dns[1]); + log_Printf(LogIPCP, "Secondary nameserver set to %s\n", paddr); + fprintf(fp, "nameserver %s\n", paddr); + } + if (fclose(fp) == EOF) { + log_Printf(LogERROR, "write(): Failed updating %s: %s\n", _PATH_RESCONF, + strerror(errno)); + return 0; + } + } else { + umask(mask); + log_Printf(LogERROR,"fopen(\"%s\", \"w\") failed: %s\n", _PATH_RESCONF, + strerror(errno)); + } + + return 1; +} + +void +ipcp_RestoreDNS(struct ipcp *ipcp) +{ + if (ipcp->ns.resolver) { + ssize_t got, len; + int fd; + + if ((fd = ID0open(_PATH_RESCONF, O_WRONLY|O_TRUNC, 0644)) != -1) { + len = strlen(ipcp->ns.resolv); + if ((got = write(fd, ipcp->ns.resolv, len)) != len) { + if (got == -1) + log_Printf(LogERROR, "Failed rewriting %s: write: %s\n", + _PATH_RESCONF, strerror(errno)); + else + log_Printf(LogERROR, "Failed rewriting %s: wrote %ld of %ld\n", + _PATH_RESCONF, (long)got, (long)len); + } + close(fd); + } else + log_Printf(LogERROR, "Failed rewriting %s: open: %s\n", _PATH_RESCONF, + strerror(errno)); + } else if (remove(_PATH_RESCONF) == -1) + log_Printf(LogERROR, "Failed removing %s: %s\n", _PATH_RESCONF, + strerror(errno)); + +} + +int +ipcp_Show(struct cmdargs const *arg) +{ + struct ipcp *ipcp = &arg->bundle->ncp.ipcp; + + prompt_Printf(arg->prompt, "%s [%s]\n", ipcp->fsm.name, + State2Nam(ipcp->fsm.state)); + if (ipcp->fsm.state == ST_OPENED) { + prompt_Printf(arg->prompt, " His side: %s, %s\n", + inet_ntoa(ipcp->peer_ip), vj2asc(ipcp->peer_compproto)); + prompt_Printf(arg->prompt, " My side: %s, %s\n", + inet_ntoa(ipcp->my_ip), vj2asc(ipcp->my_compproto)); + prompt_Printf(arg->prompt, " Queued packets: %lu\n", + (unsigned long)ipcp_QueueLen(ipcp)); + } + + prompt_Printf(arg->prompt, "\nDefaults:\n"); + prompt_Printf(arg->prompt, " FSM retry = %us, max %u Config" + " REQ%s, %u Term REQ%s\n", ipcp->cfg.fsm.timeout, + ipcp->cfg.fsm.maxreq, ipcp->cfg.fsm.maxreq == 1 ? "" : "s", + ipcp->cfg.fsm.maxtrm, ipcp->cfg.fsm.maxtrm == 1 ? "" : "s"); + prompt_Printf(arg->prompt, " My Address: %s\n", + ncprange_ntoa(&ipcp->cfg.my_range)); + if (ipcp->cfg.HaveTriggerAddress) + prompt_Printf(arg->prompt, " Trigger address: %s\n", + inet_ntoa(ipcp->cfg.TriggerAddress)); + + prompt_Printf(arg->prompt, " VJ compression: %s (%d slots %s slot " + "compression)\n", command_ShowNegval(ipcp->cfg.vj.neg), + ipcp->cfg.vj.slots, ipcp->cfg.vj.slotcomp ? "with" : "without"); + + if (iplist_isvalid(&ipcp->cfg.peer_list)) + prompt_Printf(arg->prompt, " His Address: %s\n", + ipcp->cfg.peer_list.src); + else + prompt_Printf(arg->prompt, " His Address: %s\n", + ncprange_ntoa(&ipcp->cfg.peer_range)); + + prompt_Printf(arg->prompt, " DNS: %s", + ipcp->cfg.ns.dns[0].s_addr == INADDR_NONE ? + "none" : inet_ntoa(ipcp->cfg.ns.dns[0])); + if (ipcp->cfg.ns.dns[1].s_addr != INADDR_NONE) + prompt_Printf(arg->prompt, ", %s", + inet_ntoa(ipcp->cfg.ns.dns[1])); + prompt_Printf(arg->prompt, ", %s\n", + command_ShowNegval(ipcp->cfg.ns.dns_neg)); + prompt_Printf(arg->prompt, " Resolver DNS: %s", + ipcp->ns.dns[0].s_addr == INADDR_NONE ? + "none" : inet_ntoa(ipcp->ns.dns[0])); + if (ipcp->ns.dns[1].s_addr != INADDR_NONE && + ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr) + prompt_Printf(arg->prompt, ", %s", + inet_ntoa(ipcp->ns.dns[1])); + prompt_Printf(arg->prompt, "\n NetBIOS NS: %s, ", + inet_ntoa(ipcp->cfg.ns.nbns[0])); + prompt_Printf(arg->prompt, "%s\n\n", + inet_ntoa(ipcp->cfg.ns.nbns[1])); + + throughput_disp(&ipcp->throughput, arg->prompt); + + return 0; +} + +int +ipcp_vjset(struct cmdargs const *arg) +{ + if (arg->argc != arg->argn+2) + return -1; + if (!strcasecmp(arg->argv[arg->argn], "slots")) { + int slots; + + slots = atoi(arg->argv[arg->argn+1]); + if (slots < 4 || slots > 16) + return 1; + arg->bundle->ncp.ipcp.cfg.vj.slots = slots; + return 0; + } else if (!strcasecmp(arg->argv[arg->argn], "slotcomp")) { + if (!strcasecmp(arg->argv[arg->argn+1], "on")) + arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 1; + else if (!strcasecmp(arg->argv[arg->argn+1], "off")) + arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 0; + else + return 2; + return 0; + } + return -1; +} + +void +ipcp_Init(struct ipcp *ipcp, struct bundle *bundle, struct link *l, + const struct fsm_parent *parent) +{ + struct hostent *hp; + struct in_addr host; + char name[MAXHOSTNAMELEN]; + static const char * const timer_names[] = + {"IPCP restart", "IPCP openmode", "IPCP stopped"}; + + fsm_Init(&ipcp->fsm, "IPCP", PROTO_IPCP, 1, IPCP_MAXCODE, LogIPCP, + bundle, l, parent, &ipcp_Callbacks, timer_names); + + ipcp->cfg.vj.slots = DEF_VJ_STATES; + ipcp->cfg.vj.slotcomp = 1; + memset(&ipcp->cfg.my_range, '\0', sizeof ipcp->cfg.my_range); + + host.s_addr = htonl(INADDR_LOOPBACK); + ipcp->cfg.netmask.s_addr = INADDR_ANY; + if (gethostname(name, sizeof name) == 0) { + hp = gethostbyname(name); + if (hp && hp->h_addrtype == AF_INET && hp->h_length == sizeof host.s_addr) + memcpy(&host.s_addr, hp->h_addr, sizeof host.s_addr); + } + ncprange_setip4(&ipcp->cfg.my_range, host, ipcp->cfg.netmask); + ncprange_setip4(&ipcp->cfg.peer_range, ipcp->cfg.netmask, ipcp->cfg.netmask); + + iplist_setsrc(&ipcp->cfg.peer_list, ""); + ipcp->cfg.HaveTriggerAddress = 0; + + ipcp->cfg.ns.dns[0].s_addr = INADDR_NONE; + ipcp->cfg.ns.dns[1].s_addr = INADDR_NONE; + ipcp->cfg.ns.dns_neg = 0; + ipcp->cfg.ns.nbns[0].s_addr = INADDR_ANY; + ipcp->cfg.ns.nbns[1].s_addr = INADDR_ANY; + + ipcp->cfg.fsm.timeout = DEF_FSMRETRY; + ipcp->cfg.fsm.maxreq = DEF_FSMTRIES; + ipcp->cfg.fsm.maxtrm = DEF_FSMTRIES; + ipcp->cfg.vj.neg = NEG_ENABLED|NEG_ACCEPTED; + + memset(&ipcp->vj, '\0', sizeof ipcp->vj); + + ipcp->ns.resolv = NULL; + ipcp->ns.resolv_nons = NULL; + ipcp->ns.writable = 1; + ipcp_LoadDNS(ipcp); + + throughput_init(&ipcp->throughput, SAMPLE_PERIOD); + memset(ipcp->Queue, '\0', sizeof ipcp->Queue); + ipcp_Setup(ipcp, INADDR_NONE); +} + +void +ipcp_Destroy(struct ipcp *ipcp) +{ + throughput_destroy(&ipcp->throughput); + + if (ipcp->ns.resolv != NULL) { + free(ipcp->ns.resolv); + ipcp->ns.resolv = NULL; + } + if (ipcp->ns.resolv_nons != NULL) { + free(ipcp->ns.resolv_nons); + ipcp->ns.resolv_nons = NULL; + } +} + +void +ipcp_SetLink(struct ipcp *ipcp, struct link *l) +{ + ipcp->fsm.link = l; +} + +void +ipcp_Setup(struct ipcp *ipcp, u_int32_t mask) +{ + struct iface *iface = ipcp->fsm.bundle->iface; + struct ncpaddr ipaddr; + struct in_addr peer; + int pos; + unsigned n; + + ipcp->fsm.open_mode = 0; + ipcp->ifmask.s_addr = mask == INADDR_NONE ? ipcp->cfg.netmask.s_addr : mask; + + if (iplist_isvalid(&ipcp->cfg.peer_list)) { + /* Try to give the peer a previously configured IP address */ + for (n = 0; n < iface->addrs; n++) { + if (!ncpaddr_getip4(&iface->addr[n].peer, &peer)) + continue; + if ((pos = iplist_ip2pos(&ipcp->cfg.peer_list, peer)) != -1) { + ncpaddr_setip4(&ipaddr, iplist_setcurpos(&ipcp->cfg.peer_list, pos)); + break; + } + } + if (n == iface->addrs) + /* Ok, so none of 'em fit.... pick a random one */ + ncpaddr_setip4(&ipaddr, iplist_setrandpos(&ipcp->cfg.peer_list)); + + ncprange_sethost(&ipcp->cfg.peer_range, &ipaddr); + } + + ipcp->heis1172 = 0; + ipcp->peer_req = 0; + ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip); + ipcp->peer_compproto = 0; + + if (ipcp->cfg.HaveTriggerAddress) { + /* + * Some implementations of PPP require that we send a + * *special* value as our address, even though the rfc specifies + * full negotiation (e.g. "0.0.0.0" or Not "0.0.0.0"). + */ + ipcp->my_ip = ipcp->cfg.TriggerAddress; + log_Printf(LogIPCP, "Using trigger address %s\n", + inet_ntoa(ipcp->cfg.TriggerAddress)); + } else { + /* + * Otherwise, if we've used an IP number before and it's still within + * the network specified on the ``set ifaddr'' line, we really + * want to keep that IP number so that we can keep any existing + * connections that are bound to that IP. + */ + for (n = 0; n < iface->addrs; n++) { + ncprange_getaddr(&iface->addr[n].ifa, &ipaddr); + if (ncprange_contains(&ipcp->cfg.my_range, &ipaddr)) { + ncpaddr_getip4(&ipaddr, &ipcp->my_ip); + break; + } + } + if (n == iface->addrs) + ncprange_getip4addr(&ipcp->cfg.my_range, &ipcp->my_ip); + } + + if (IsEnabled(ipcp->cfg.vj.neg) +#ifndef NORADIUS + || (ipcp->fsm.bundle->radius.valid && ipcp->fsm.bundle->radius.vj) +#endif + ) + ipcp->my_compproto = (PROTO_VJCOMP << 16) + + ((ipcp->cfg.vj.slots - 1) << 8) + + ipcp->cfg.vj.slotcomp; + else + ipcp->my_compproto = 0; + sl_compress_init(&ipcp->vj.cslc, ipcp->cfg.vj.slots - 1); + + ipcp->peer_reject = 0; + ipcp->my_reject = 0; + + /* Copy startup values into ipcp->ns.dns */ + if (ipcp->cfg.ns.dns[0].s_addr != INADDR_NONE) + memcpy(ipcp->ns.dns, ipcp->cfg.ns.dns, sizeof ipcp->ns.dns); +} + +static int +numaddresses(struct in_addr mask) +{ + u_int32_t bit, haddr; + int n; + + haddr = ntohl(mask.s_addr); + bit = 1; + n = 1; + + do { + if (!(haddr & bit)) + n <<= 1; + } while (bit <<= 1); + + return n; +} + +static int +ipcp_proxyarp(struct ipcp *ipcp, + int (*proxyfun)(struct bundle *, struct in_addr), + const struct iface_addr *addr) +{ + struct bundle *bundle = ipcp->fsm.bundle; + struct in_addr peer, mask, ip; + int n, ret; + + if (!ncpaddr_getip4(&addr->peer, &peer)) { + log_Printf(LogERROR, "Oops, ipcp_proxyarp() called with unexpected addr\n"); + return 0; + } + + ret = 0; + + if (Enabled(bundle, OPT_PROXYALL)) { + ncprange_getip4mask(&addr->ifa, &mask); + if ((n = numaddresses(mask)) > 256) { + log_Printf(LogWARN, "%s: Too many addresses for proxyall\n", + ncprange_ntoa(&addr->ifa)); + return 0; + } + ip.s_addr = peer.s_addr & mask.s_addr; + if (n >= 4) { + ip.s_addr = htonl(ntohl(ip.s_addr) + 1); + n -= 2; + } + while (n) { + if (!((ip.s_addr ^ peer.s_addr) & mask.s_addr)) { + if (!(ret = (*proxyfun)(bundle, ip))) + break; + n--; + } + ip.s_addr = htonl(ntohl(ip.s_addr) + 1); + } + ret = !n; + } else if (Enabled(bundle, OPT_PROXY)) + ret = (*proxyfun)(bundle, peer); + + return ret; +} + +static int +ipcp_SetIPaddress(struct ipcp *ipcp, struct in_addr myaddr, + struct in_addr hisaddr) +{ + struct bundle *bundle = ipcp->fsm.bundle; + struct ncpaddr myncpaddr, hisncpaddr; + struct ncprange myrange; + struct in_addr mask; + struct sockaddr_storage ssdst, ssgw, ssmask; + struct sockaddr *sadst, *sagw, *samask; + + sadst = (struct sockaddr *)&ssdst; + sagw = (struct sockaddr *)&ssgw; + samask = (struct sockaddr *)&ssmask; + + ncpaddr_setip4(&hisncpaddr, hisaddr); + ncpaddr_setip4(&myncpaddr, myaddr); + ncprange_sethost(&myrange, &myncpaddr); + + mask = addr2mask(myaddr); + + if (ipcp->ifmask.s_addr != INADDR_ANY && + (ipcp->ifmask.s_addr & mask.s_addr) == mask.s_addr) + ncprange_setip4mask(&myrange, ipcp->ifmask); + + if (!iface_Add(bundle->iface, &bundle->ncp, &myrange, &hisncpaddr, + IFACE_ADD_FIRST|IFACE_FORCE_ADD|IFACE_SYSTEM)) + return 0; + + if (!Enabled(bundle, OPT_IFACEALIAS)) + iface_Clear(bundle->iface, &bundle->ncp, AF_INET, + IFACE_CLEAR_ALIASES|IFACE_SYSTEM); + + if (bundle->ncp.cfg.sendpipe > 0 || bundle->ncp.cfg.recvpipe > 0) { + ncprange_getsa(&myrange, &ssgw, &ssmask); + ncpaddr_getsa(&hisncpaddr, &ssdst); + rt_Update(bundle, sadst, sagw, samask, NULL, NULL); + } + + if (Enabled(bundle, OPT_SROUTES)) + route_Change(bundle, bundle->ncp.route, &myncpaddr, &hisncpaddr); + +#ifndef NORADIUS + if (bundle->radius.valid) + route_Change(bundle, bundle->radius.routes, &myncpaddr, &hisncpaddr); +#endif + + return 1; /* Ok */ +} + +static struct in_addr +ChooseHisAddr(struct bundle *bundle, struct in_addr gw) +{ + struct in_addr try; + u_long f; + + for (f = 0; f < bundle->ncp.ipcp.cfg.peer_list.nItems; f++) { + try = iplist_next(&bundle->ncp.ipcp.cfg.peer_list); + log_Printf(LogDEBUG, "ChooseHisAddr: Check item %ld (%s)\n", + f, inet_ntoa(try)); + if (ipcp_SetIPaddress(&bundle->ncp.ipcp, gw, try)) { + log_Printf(LogIPCP, "Selected IP address %s\n", inet_ntoa(try)); + break; + } + } + + if (f == bundle->ncp.ipcp.cfg.peer_list.nItems) { + log_Printf(LogDEBUG, "ChooseHisAddr: All addresses in use !\n"); + try.s_addr = INADDR_ANY; + } + + return try; +} + +static void +IpcpInitRestartCounter(struct fsm *fp, int what) +{ + /* Set fsm timer load */ + struct ipcp *ipcp = fsm2ipcp(fp); + + fp->FsmTimer.load = ipcp->cfg.fsm.timeout * SECTICKS; + switch (what) { + case FSM_REQ_TIMER: + fp->restart = ipcp->cfg.fsm.maxreq; + break; + case FSM_TRM_TIMER: + fp->restart = ipcp->cfg.fsm.maxtrm; + break; + default: + fp->restart = 1; + break; + } +} + +static void +IpcpSendConfigReq(struct fsm *fp) +{ + /* Send config REQ please */ + struct physical *p = link2physical(fp->link); + struct ipcp *ipcp = fsm2ipcp(fp); + u_char buff[MAX_FSM_OPT_LEN]; + struct fsm_opt *o; + + o = (struct fsm_opt *)buff; + + if ((p && !physical_IsSync(p)) || !REJECTED(ipcp, TY_IPADDR)) { + memcpy(o->data, &ipcp->my_ip.s_addr, 4); + INC_FSM_OPT(TY_IPADDR, 6, o); + } + + if (ipcp->my_compproto && !REJECTED(ipcp, TY_COMPPROTO)) { + if (ipcp->heis1172) { + u_int16_t proto = PROTO_VJCOMP; + + ua_htons(&proto, o->data); + INC_FSM_OPT(TY_COMPPROTO, 4, o); + } else { + struct compreq req; + + req.proto = htons(ipcp->my_compproto >> 16); + req.slots = (ipcp->my_compproto >> 8) & 255; + req.compcid = ipcp->my_compproto & 1; + memcpy(o->data, &req, 4); + INC_FSM_OPT(TY_COMPPROTO, 6, o); + } + } + + if (IsEnabled(ipcp->cfg.ns.dns_neg)) { + if (!REJECTED(ipcp, TY_PRIMARY_DNS - TY_ADJUST_NS)) { + memcpy(o->data, &ipcp->ns.dns[0].s_addr, 4); + INC_FSM_OPT(TY_PRIMARY_DNS, 6, o); + } + + if (!REJECTED(ipcp, TY_SECONDARY_DNS - TY_ADJUST_NS)) { + memcpy(o->data, &ipcp->ns.dns[1].s_addr, 4); + INC_FSM_OPT(TY_SECONDARY_DNS, 6, o); + } + } + + fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff, + MB_IPCPOUT); +} + +static void +IpcpSentTerminateReq(struct fsm *fp __unused) +{ + /* Term REQ just sent by FSM */ +} + +static void +IpcpSendTerminateAck(struct fsm *fp, u_char id) +{ + /* Send Term ACK please */ + fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_IPCPOUT); +} + +static void +IpcpLayerStart(struct fsm *fp) +{ + /* We're about to start up ! */ + struct ipcp *ipcp = fsm2ipcp(fp); + + log_Printf(LogIPCP, "%s: LayerStart.\n", fp->link->name); + throughput_start(&ipcp->throughput, "IPCP throughput", + Enabled(fp->bundle, OPT_THROUGHPUT)); + fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3; + ipcp->peer_req = 0; +} + +static void +IpcpLayerFinish(struct fsm *fp) +{ + /* We're now down */ + struct ipcp *ipcp = fsm2ipcp(fp); + + log_Printf(LogIPCP, "%s: LayerFinish.\n", fp->link->name); + throughput_stop(&ipcp->throughput); + throughput_log(&ipcp->throughput, LogIPCP, NULL); +} + +/* + * Called from iface_Add() via ncp_IfaceAddrAdded() + */ +void +ipcp_IfaceAddrAdded(struct ipcp *ipcp, const struct iface_addr *addr) +{ + struct bundle *bundle = ipcp->fsm.bundle; + + if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL)) + ipcp_proxyarp(ipcp, arp_SetProxy, addr); +} + +/* + * Called from iface_Clear() and iface_Delete() via ncp_IfaceAddrDeleted() + */ +void +ipcp_IfaceAddrDeleted(struct ipcp *ipcp, const struct iface_addr *addr) +{ + struct bundle *bundle = ipcp->fsm.bundle; + + if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL)) + ipcp_proxyarp(ipcp, arp_ClearProxy, addr); +} + +static void +IpcpLayerDown(struct fsm *fp) +{ + /* About to come down */ + struct ipcp *ipcp = fsm2ipcp(fp); + static int recursing; + char addr[16]; + + if (!recursing++) { + snprintf(addr, sizeof addr, "%s", inet_ntoa(ipcp->my_ip)); + log_Printf(LogIPCP, "%s: LayerDown: %s\n", fp->link->name, addr); + +#ifndef NORADIUS + radius_Flush(&fp->bundle->radius); + radius_Account(&fp->bundle->radius, &fp->bundle->radacct, + fp->bundle->links, RAD_STOP, &ipcp->throughput); + + if (*fp->bundle->radius.cfg.file && fp->bundle->radius.filterid) + system_Select(fp->bundle, fp->bundle->radius.filterid, LINKDOWNFILE, + NULL, NULL); + radius_StopTimer(&fp->bundle->radius); +#endif + + /* + * XXX this stuff should really live in the FSM. Our config should + * associate executable sections in files with events. + */ + if (system_Select(fp->bundle, addr, LINKDOWNFILE, NULL, NULL) < 0) { + if (bundle_GetLabel(fp->bundle)) { + if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle), + LINKDOWNFILE, NULL, NULL) < 0) + system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL); + } else + system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL); + } + + ipcp_Setup(ipcp, INADDR_NONE); + } + recursing--; +} + +int +ipcp_InterfaceUp(struct ipcp *ipcp) +{ + if (!ipcp_SetIPaddress(ipcp, ipcp->my_ip, ipcp->peer_ip)) { + log_Printf(LogERROR, "ipcp_InterfaceUp: unable to set ip address\n"); + return 0; + } + + if (!iface_SetFlags(ipcp->fsm.bundle->iface->name, IFF_UP)) { + log_Printf(LogERROR, "ipcp_InterfaceUp: Can't set the IFF_UP flag on %s\n", + ipcp->fsm.bundle->iface->name); + return 0; + } + +#ifndef NONAT + if (ipcp->fsm.bundle->NatEnabled) + LibAliasSetAddress(la, ipcp->my_ip); +#endif + + return 1; +} + +static int +IpcpLayerUp(struct fsm *fp) +{ + /* We're now up */ + struct ipcp *ipcp = fsm2ipcp(fp); + char tbuff[16]; + + log_Printf(LogIPCP, "%s: LayerUp.\n", fp->link->name); + snprintf(tbuff, sizeof tbuff, "%s", inet_ntoa(ipcp->my_ip)); + log_Printf(LogIPCP, "myaddr %s hisaddr = %s\n", + tbuff, inet_ntoa(ipcp->peer_ip)); + + if (ipcp->peer_compproto >> 16 == PROTO_VJCOMP) + sl_compress_init(&ipcp->vj.cslc, (ipcp->peer_compproto >> 8) & 255); + + if (!ipcp_InterfaceUp(ipcp)) + return 0; + +#ifndef NORADIUS + radius_Account_Set_Ip(&fp->bundle->radacct, &ipcp->peer_ip, &ipcp->ifmask); + radius_Account(&fp->bundle->radius, &fp->bundle->radacct, fp->bundle->links, + RAD_START, &ipcp->throughput); + + if (*fp->bundle->radius.cfg.file && fp->bundle->radius.filterid) + system_Select(fp->bundle, fp->bundle->radius.filterid, LINKUPFILE, + NULL, NULL); + radius_StartTimer(fp->bundle); +#endif + + /* + * XXX this stuff should really live in the FSM. Our config should + * associate executable sections in files with events. + */ + if (system_Select(fp->bundle, tbuff, LINKUPFILE, NULL, NULL) < 0) { + if (bundle_GetLabel(fp->bundle)) { + if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle), + LINKUPFILE, NULL, NULL) < 0) + system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL); + } else + system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL); + } + + fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3; + log_DisplayPrompts(); + + return 1; +} + +static void +ipcp_ValidateReq(struct ipcp *ipcp, struct in_addr ip, struct fsm_decode *dec) +{ + struct bundle *bundle = ipcp->fsm.bundle; + struct iface *iface = bundle->iface; + struct in_addr myaddr, peer; + unsigned n; + + if (iplist_isvalid(&ipcp->cfg.peer_list)) { + ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); + if (ip.s_addr == INADDR_ANY || + iplist_ip2pos(&ipcp->cfg.peer_list, ip) < 0 || + !ipcp_SetIPaddress(ipcp, myaddr, ip)) { + log_Printf(LogIPCP, "%s: Address invalid or already in use\n", + inet_ntoa(ip)); + /* + * If we've already had a valid address configured for the peer, + * try NAKing with that so that we don't have to upset things + * too much. + */ + for (n = 0; n < iface->addrs; n++) { + if (!ncpaddr_getip4(&iface->addr[n].peer, &peer)) + continue; + if (iplist_ip2pos(&ipcp->cfg.peer_list, peer) >= 0) { + ipcp->peer_ip = peer; + break; + } + } + + if (n == iface->addrs) { + /* Just pick an IP number from our list */ + ipcp->peer_ip = ChooseHisAddr(bundle, myaddr); + } + + if (ipcp->peer_ip.s_addr == INADDR_ANY) { + *dec->rejend++ = TY_IPADDR; + *dec->rejend++ = 6; + memcpy(dec->rejend, &ip.s_addr, 4); + dec->rejend += 4; + } else { + *dec->nakend++ = TY_IPADDR; + *dec->nakend++ = 6; + memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4); + dec->nakend += 4; + } + return; + } + } else if (ip.s_addr == INADDR_ANY || + !ncprange_containsip4(&ipcp->cfg.peer_range, ip)) { + /* + * If the destination address is not acceptable, NAK with what we + * want to use. + */ + *dec->nakend++ = TY_IPADDR; + *dec->nakend++ = 6; + for (n = 0; n < iface->addrs; n++) + if (ncprange_contains(&ipcp->cfg.peer_range, &iface->addr[n].peer)) { + /* We prefer the already-configured address */ + ncpaddr_getip4addr(&iface->addr[n].peer, (u_int32_t *)dec->nakend); + break; + } + + if (n == iface->addrs) + memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4); + + dec->nakend += 4; + return; + } + + ipcp->peer_ip = ip; + *dec->ackend++ = TY_IPADDR; + *dec->ackend++ = 6; + memcpy(dec->ackend, &ip.s_addr, 4); + dec->ackend += 4; +} + +static void +IpcpDecodeConfig(struct fsm *fp, u_char *cp, u_char *end, int mode_type, + struct fsm_decode *dec) +{ + /* Deal with incoming PROTO_IPCP */ + struct ncpaddr ncpaddr; + struct ipcp *ipcp = fsm2ipcp(fp); + int gotdnsnak; + u_int32_t compproto; + struct compreq pcomp; + struct in_addr ipaddr, dstipaddr, have_ip; + char tbuff[100], tbuff2[100]; + struct fsm_opt *opt, nak; + + gotdnsnak = 0; + + while (end - cp >= (int)sizeof(opt->hdr)) { + if ((opt = fsm_readopt(&cp)) == NULL) + break; + + snprintf(tbuff, sizeof tbuff, " %s[%d]", protoname(opt->hdr.id), + opt->hdr.len); + + switch (opt->hdr.id) { + case TY_IPADDR: /* RFC1332 */ + memcpy(&ipaddr.s_addr, opt->data, 4); + log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); + + switch (mode_type) { + case MODE_REQ: + ipcp->peer_req = 1; + ipcp_ValidateReq(ipcp, ipaddr, dec); + break; + + case MODE_NAK: + if (ncprange_containsip4(&ipcp->cfg.my_range, ipaddr)) { + /* Use address suggested by peer */ + snprintf(tbuff2, sizeof tbuff2, "%s changing address: %s ", tbuff, + inet_ntoa(ipcp->my_ip)); + log_Printf(LogIPCP, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr)); + ipcp->my_ip = ipaddr; + ncpaddr_setip4(&ncpaddr, ipcp->my_ip); + bundle_AdjustFilters(fp->bundle, &ncpaddr, NULL); + } else { + log_Printf(log_IsKept(LogIPCP) ? LogIPCP : LogPHASE, + "%s: Unacceptable address!\n", inet_ntoa(ipaddr)); + fsm_Close(&ipcp->fsm); + } + break; + + case MODE_REJ: + ipcp->peer_reject |= (1 << opt->hdr.id); + break; + } + break; + + case TY_COMPPROTO: + memcpy(&pcomp, opt->data, sizeof pcomp); + compproto = (ntohs(pcomp.proto) << 16) + ((int)pcomp.slots << 8) + + pcomp.compcid; + log_Printf(LogIPCP, "%s %s\n", tbuff, vj2asc(compproto)); + + switch (mode_type) { + case MODE_REQ: + if (!IsAccepted(ipcp->cfg.vj.neg)) + fsm_rej(dec, opt); + else { + switch (opt->hdr.len) { + case 4: /* RFC1172 */ + if (ntohs(pcomp.proto) == PROTO_VJCOMP) { + log_Printf(LogWARN, "Peer is speaking RFC1172 compression " + "protocol !\n"); + ipcp->heis1172 = 1; + ipcp->peer_compproto = compproto; + fsm_ack(dec, opt); + } else { + pcomp.proto = htons(PROTO_VJCOMP); + nak.hdr.id = TY_COMPPROTO; + nak.hdr.len = 4; + memcpy(nak.data, &pcomp, 2); + fsm_nak(dec, &nak); + } + break; + case 6: /* RFC1332 */ + if (ntohs(pcomp.proto) == PROTO_VJCOMP) { + /* We know pcomp.slots' max value == MAX_VJ_STATES */ + if (pcomp.slots >= MIN_VJ_STATES) { + /* Ok, we can do that */ + ipcp->peer_compproto = compproto; + ipcp->heis1172 = 0; + fsm_ack(dec, opt); + } else { + /* Get as close as we can to what he wants */ + ipcp->heis1172 = 0; + pcomp.slots = MIN_VJ_STATES; + nak.hdr.id = TY_COMPPROTO; + nak.hdr.len = 4; + memcpy(nak.data, &pcomp, 2); + fsm_nak(dec, &nak); + } + } else { + /* What we really want */ + pcomp.proto = htons(PROTO_VJCOMP); + pcomp.slots = DEF_VJ_STATES; + pcomp.compcid = 1; + nak.hdr.id = TY_COMPPROTO; + nak.hdr.len = 6; + memcpy(nak.data, &pcomp, sizeof pcomp); + fsm_nak(dec, &nak); + } + break; + default: + fsm_rej(dec, opt); + break; + } + } + break; + + case MODE_NAK: + if (ntohs(pcomp.proto) == PROTO_VJCOMP) { + /* We know pcomp.slots' max value == MAX_VJ_STATES */ + if (pcomp.slots < MIN_VJ_STATES) + pcomp.slots = MIN_VJ_STATES; + compproto = (ntohs(pcomp.proto) << 16) + (pcomp.slots << 8) + + pcomp.compcid; + } else + compproto = 0; + log_Printf(LogIPCP, "%s changing compproto: %08x --> %08x\n", + tbuff, ipcp->my_compproto, compproto); + ipcp->my_compproto = compproto; + break; + + case MODE_REJ: + ipcp->peer_reject |= (1 << opt->hdr.id); + break; + } + break; + + case TY_IPADDRS: /* RFC1172 */ + memcpy(&ipaddr.s_addr, opt->data, 4); + memcpy(&dstipaddr.s_addr, opt->data + 4, 4); + snprintf(tbuff2, sizeof tbuff2, "%s %s,", tbuff, inet_ntoa(ipaddr)); + log_Printf(LogIPCP, "%s %s\n", tbuff2, inet_ntoa(dstipaddr)); + + switch (mode_type) { + case MODE_REQ: + fsm_rej(dec, opt); + break; + + case MODE_NAK: + case MODE_REJ: + break; + } + break; + + case TY_PRIMARY_DNS: /* DNS negotiation (rfc1877) */ + case TY_SECONDARY_DNS: + memcpy(&ipaddr.s_addr, opt->data, 4); + log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); + + switch (mode_type) { + case MODE_REQ: + if (!IsAccepted(ipcp->cfg.ns.dns_neg)) { + ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); + fsm_rej(dec, opt); + break; + } + have_ip = ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1]; + + if (opt->hdr.id == TY_PRIMARY_DNS && ipaddr.s_addr != have_ip.s_addr && + ipaddr.s_addr == ipcp->ns.dns[1].s_addr) { + /* Swap 'em 'round */ + ipcp->ns.dns[0] = ipcp->ns.dns[1]; + ipcp->ns.dns[1] = have_ip; + have_ip = ipcp->ns.dns[0]; + } + + if (ipaddr.s_addr != have_ip.s_addr) { + /* + * The client has got the DNS stuff wrong (first request) so + * we'll tell 'em how it is + */ + nak.hdr.id = opt->hdr.id; + nak.hdr.len = 6; + memcpy(nak.data, &have_ip.s_addr, 4); + fsm_nak(dec, &nak); + } else { + /* + * Otherwise they have it right (this time) so we send an ack packet + * back confirming it... end of story + */ + fsm_ack(dec, opt); + } + break; + + case MODE_NAK: + if (IsEnabled(ipcp->cfg.ns.dns_neg)) { + gotdnsnak = 1; + memcpy(&ipcp->ns.dns[opt->hdr.id == TY_PRIMARY_DNS ? 0 : 1].s_addr, + opt->data, 4); + } + break; + + case MODE_REJ: /* Can't do much, stop asking */ + ipcp->peer_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); + break; + } + break; + + case TY_PRIMARY_NBNS: /* M$ NetBIOS nameserver hack (rfc1877) */ + case TY_SECONDARY_NBNS: + memcpy(&ipaddr.s_addr, opt->data, 4); + log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); + + switch (mode_type) { + case MODE_REQ: + have_ip.s_addr = + ipcp->cfg.ns.nbns[opt->hdr.id == TY_PRIMARY_NBNS ? 0 : 1].s_addr; + + if (have_ip.s_addr == INADDR_ANY) { + log_Printf(LogIPCP, "NBNS REQ - rejected - nbns not set\n"); + ipcp->my_reject |= (1 << (opt->hdr.id - TY_ADJUST_NS)); + fsm_rej(dec, opt); + break; + } + + if (ipaddr.s_addr != have_ip.s_addr) { + nak.hdr.id = opt->hdr.id; + nak.hdr.len = 6; + memcpy(nak.data, &have_ip.s_addr, 4); + fsm_nak(dec, &nak); + } else + fsm_ack(dec, opt); + break; + + case MODE_NAK: + log_Printf(LogIPCP, "MS NBNS req %d - NAK??\n", opt->hdr.id); + break; + + case MODE_REJ: + log_Printf(LogIPCP, "MS NBNS req %d - REJ??\n", opt->hdr.id); + break; + } + break; + + default: + if (mode_type != MODE_NOP) { + ipcp->my_reject |= (1 << opt->hdr.id); + fsm_rej(dec, opt); + } + break; + } + } + + if (gotdnsnak) { + if (ipcp->ns.writable) { + log_Printf(LogDEBUG, "Updating resolver\n"); + if (!ipcp_WriteDNS(ipcp)) { + ipcp->peer_reject |= (1 << (TY_PRIMARY_DNS - TY_ADJUST_NS)); + ipcp->peer_reject |= (1 << (TY_SECONDARY_DNS - TY_ADJUST_NS)); + } else + bundle_AdjustDNS(fp->bundle); + } else { + log_Printf(LogDEBUG, "Not updating resolver (readonly)\n"); + bundle_AdjustDNS(fp->bundle); + } + } + + if (mode_type != MODE_NOP) { + if (mode_type == MODE_REQ && !ipcp->peer_req) { + if (dec->rejend == dec->rej && dec->nakend == dec->nak) { + /* + * Pretend the peer has requested an IP. + * We do this to ensure that we only send one NAK if the only + * reason for the NAK is because the peer isn't sending a + * TY_IPADDR REQ. This stops us from repeatedly trying to tell + * the peer that we have to have an IP address on their end. + */ + ipcp->peer_req = 1; + } + ipaddr.s_addr = INADDR_ANY; + ipcp_ValidateReq(ipcp, ipaddr, dec); + } + fsm_opt_normalise(dec); + } +} + +extern struct mbuf * +ipcp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp) +{ + /* Got PROTO_IPCP from link */ + m_settype(bp, MB_IPCPIN); + if (bundle_Phase(bundle) == PHASE_NETWORK) + fsm_Input(&bundle->ncp.ipcp.fsm, bp); + else { + if (bundle_Phase(bundle) < PHASE_NETWORK) + log_Printf(LogIPCP, "%s: Error: Unexpected IPCP in phase %s (ignored)\n", + l->name, bundle_PhaseName(bundle)); + m_freem(bp); + } + return NULL; +} + +int +ipcp_UseHisIPaddr(struct bundle *bundle, struct in_addr hisaddr) +{ + struct ipcp *ipcp = &bundle->ncp.ipcp; + struct in_addr myaddr; + + memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range); + iplist_reset(&ipcp->cfg.peer_list); + ipcp->peer_ip = hisaddr; + ncprange_setip4host(&ipcp->cfg.peer_range, hisaddr); + ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); + + return ipcp_SetIPaddress(ipcp, myaddr, hisaddr); +} + +int +ipcp_UseHisaddr(struct bundle *bundle, const char *hisaddr, int setaddr) +{ + struct in_addr myaddr; + struct ncp *ncp = &bundle->ncp; + struct ipcp *ipcp = &ncp->ipcp; + struct ncpaddr ncpaddr; + + /* Use `hisaddr' for the peers address (set iface if `setaddr') */ + memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range); + iplist_reset(&ipcp->cfg.peer_list); + if (strpbrk(hisaddr, ",-")) { + iplist_setsrc(&ipcp->cfg.peer_list, hisaddr); + if (iplist_isvalid(&ipcp->cfg.peer_list)) { + iplist_setrandpos(&ipcp->cfg.peer_list); + ipcp->peer_ip = ChooseHisAddr(bundle, ipcp->my_ip); + if (ipcp->peer_ip.s_addr == INADDR_ANY) { + log_Printf(LogWARN, "%s: None available !\n", ipcp->cfg.peer_list.src); + return 0; + } + ncprange_setip4host(&ipcp->cfg.peer_range, ipcp->peer_ip); + } else { + log_Printf(LogWARN, "%s: Invalid range !\n", hisaddr); + return 0; + } + } else if (ncprange_aton(&ipcp->cfg.peer_range, ncp, hisaddr) != 0) { + if (ncprange_family(&ipcp->cfg.my_range) != AF_INET) { + log_Printf(LogWARN, "%s: Not an AF_INET address !\n", hisaddr); + return 0; + } + ncprange_getip4addr(&ipcp->cfg.my_range, &myaddr); + ncprange_getip4addr(&ipcp->cfg.peer_range, &ipcp->peer_ip); + + if (setaddr && !ipcp_SetIPaddress(ipcp, myaddr, ipcp->peer_ip)) + return 0; + } else + return 0; + + ncpaddr_setip4(&ncpaddr, ipcp->peer_ip); + bundle_AdjustFilters(bundle, NULL, &ncpaddr); + + return 1; /* Ok */ +} + +struct in_addr +addr2mask(struct in_addr addr) +{ + u_int32_t haddr = ntohl(addr.s_addr); + + haddr = IN_CLASSA(haddr) ? IN_CLASSA_NET : + IN_CLASSB(haddr) ? IN_CLASSB_NET : + IN_CLASSC_NET; + addr.s_addr = htonl(haddr); + + return addr; +} + +size_t +ipcp_QueueLen(struct ipcp *ipcp) +{ + struct mqueue *q; + size_t result; + + result = 0; + for (q = ipcp->Queue; q < ipcp->Queue + IPCP_QUEUES(ipcp); q++) + result += q->len; + + return result; +} + +int +ipcp_PushPacket(struct ipcp *ipcp, struct link *l) +{ + struct bundle *bundle = ipcp->fsm.bundle; + struct mqueue *queue; + struct mbuf *bp; + int m_len; + u_int32_t secs = 0; + unsigned alivesecs = 0; + + if (ipcp->fsm.state != ST_OPENED) + return 0; + + /* + * If ccp is not open but is required, do nothing. + */ + if (l->ccp.fsm.state != ST_OPENED && ccp_Required(&l->ccp)) { + log_Printf(LogPHASE, "%s: Not transmitting... waiting for CCP\n", l->name); + return 0; + } + + queue = ipcp->Queue + IPCP_QUEUES(ipcp) - 1; + do { + if (queue->top) { + bp = m_dequeue(queue); + bp = mbuf_Read(bp, &secs, sizeof secs); + bp = m_pullup(bp); + m_len = m_length(bp); + if (!FilterCheck(MBUF_CTOP(bp), AF_INET, &bundle->filter.alive, + &alivesecs)) { + if (secs == 0) + secs = alivesecs; + bundle_StartIdleTimer(bundle, secs); + } + link_PushPacket(l, bp, bundle, 0, PROTO_IP); + ipcp_AddOutOctets(ipcp, m_len); + return 1; + } + } while (queue-- != ipcp->Queue); + + return 0; +} |