--- /dev/null
+/*
+ * multilink.c - support routines for multilink.
+ *
+ * Copyright (c) 2000 Paul Mackerras.
+ * 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. The name of the author 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.
+ */
+#include <string.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <netdb.h>
+#include <netinet/in.h>
+
+#include "pppd.h"
+#include "fsm.h"
+#include "lcp.h"
+#include "tdb.h"
+
+bool endpoint_specified; /* user gave explicit endpoint discriminator */
+char *bundle_id; /* identifier for our bundle */
+
+extern TDB_CONTEXT *pppdb;
+extern char db_key[];
+
+static int get_default_epdisc __P((struct epdisc *));
+
+#define set_ip_epdisc(ep, addr) do { \
+ ep->length = 4; \
+ ep->value[0] = addr >> 24; \
+ ep->value[1] = addr >> 16; \
+ ep->value[2] = addr >> 8; \
+ ep->value[3] = addr; \
+} while (0)
+
+#define LOCAL_IP_ADDR(addr) \
+ (((addr) & 0xff000000) == 0x0a000000 /* 10.x.x.x */ \
+ || ((addr) & 0xfff00000) == 0xac100000 /* 172.16.x.x */ \
+ || ((addr) & 0xffff0000) == 0xc0a80000) /* 192.168.x.x */
+
+void
+mp_check_options()
+{
+ lcp_options *wo = &lcp_wantoptions[0];
+ lcp_options *ao = &lcp_allowoptions[0];
+
+ if (!multilink)
+ return;
+ /* if we're doing multilink, we have to negotiate MRRU */
+ if (!wo->neg_mrru) {
+ /* mrru not specified, default to mru */
+ wo->mrru = wo->mru;
+ wo->neg_mrru = 1;
+ }
+ ao->mrru = ao->mru;
+ ao->neg_mrru = 1;
+
+ if (!wo->neg_endpoint && !noendpoint) {
+ /* get a default endpoint value */
+ wo->neg_endpoint = get_default_epdisc(&wo->endpoint);
+ if (wo->neg_endpoint)
+ info("using default endpoint %s",
+ epdisc_to_str(&wo->endpoint));
+ }
+}
+
+/*
+ * Make a new bundle or join us to an existing bundle
+ * if we are doing multilink.
+ */
+int
+mp_join_bundle()
+{
+ lcp_options *go = &lcp_gotoptions[0];
+ lcp_options *ho = &lcp_hisoptions[0];
+ int unit;
+ int i, l;
+ char *p, *endp;
+ TDB_DATA key, pid, rec;
+
+ if (!go->neg_mrru || !ho->neg_mrru) {
+ /* not doing multilink */
+ if (go->neg_mrru)
+ notice("oops, multilink negotiated only for receive");
+ multilink = 0;
+ make_new_bundle(0, 0, 0, 0);
+ set_ifunit(1);
+ return 0;
+ }
+
+ /*
+ * Find the appropriate bundle or join a new one.
+ * First we make up a name for the bundle.
+ * The length estimate is worst-case assuming every
+ * character has to be quoted.
+ */
+ l = 4 * strlen(peer_authname) + 10;
+ if (ho->neg_endpoint)
+ l += 3 * ho->endpoint.length + 8;
+ if (bundle_name)
+ l += 3 * strlen(bundle_name) + 2;
+ bundle_id = malloc(l);
+ if (bundle_id == 0)
+ novm("bundle identifier");
+
+ p = bundle_id;
+ p += slprintf(p, l-1, "BUNDLE=\"%q\"", peer_authname);
+ if (ho->neg_endpoint || bundle_name)
+ *p++ = '/';
+ if (ho->neg_endpoint)
+ p += slprintf(p, bundle_id+l-p, "%s",
+ epdisc_to_str(&ho->endpoint));
+ if (bundle_name)
+ p += slprintf(p, bundle_id+l-p, "/%v", bundle_name);
+ info("bundle_id = %s", bundle_id+7);
+
+ /*
+ * Check if the bundle ID is already in the database.
+ */
+ unit = -1;
+ key.dptr = bundle_id;
+ key.dsize = p - bundle_id;
+ pid = tdb_fetch(pppdb, key);
+ if (pid.dptr != NULL) {
+ /* bundle ID exists, see if the pppd record still exists */
+ rec = tdb_fetch(pppdb, pid);
+ if (rec.dptr != NULL) {
+ /* it is, parse the interface number */
+ p = strstr(rec.dptr, "IFNAME=ppp");
+ if (p != 0) {
+ p += 10; /* skip to unit number */
+ i = strtol(p, &endp, 10);
+ if (endp != p && (*endp == 0 || *endp == ';'))
+ unit = i;
+ }
+ free(rec.dptr);
+ }
+ free(pid.dptr);
+ }
+
+ if (unit >= 0) {
+ /* attach to existing unit */
+ if (bundle_attach(unit)) {
+ info("attached link to interface %d", ifunit);
+ set_ifunit(0);
+ script_setenv("BUNDLE", bundle_id + 7, 0);
+ return 1;
+ }
+ /* attach failed because bundle doesn't exist */
+ }
+
+ /* we have to make a new bundle */
+ make_new_bundle(go->mrru, ho->mrru, go->neg_ssnhf, ho->neg_ssnhf);
+ set_ifunit(1);
+ script_setenv("BUNDLE", bundle_id + 7, 1);
+ return 0;
+}
+
+static int
+get_default_epdisc(ep)
+ struct epdisc *ep;
+{
+ char *p;
+ struct hostent *hp;
+ u_int32_t addr;
+
+ /* First try for an ethernet MAC address */
+ p = get_first_ethernet();
+ if (p != 0 && get_if_hwaddr(ep->value, p) >= 0) {
+ ep->class = EPD_MAC;
+ ep->length = 6;
+ return 1;
+ }
+
+ /* see if our hostname corresponds to a reasonable IP address */
+ hp = gethostbyname(hostname);
+ if (hp != NULL) {
+ addr = *(u_int32_t *)hp->h_addr;
+ if (!bad_ip_adrs(addr)) {
+ addr = ntohl(addr);
+ if (!LOCAL_IP_ADDR(addr)) {
+ ep->class = EPD_IP;
+ set_ip_epdisc(ep, addr);
+ return 1;
+ }
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * epdisc_to_str - make a printable string from an endpoint discriminator.
+ */
+
+static char *endp_class_names[] = {
+ "null", "local", "IP", "MAC", "magic", "phone"
+};
+
+char *
+epdisc_to_str(ep)
+ struct epdisc *ep;
+{
+ static char str[MAX_ENDP_LEN*3+8];
+ u_char *p = ep->value;
+ int i, mask = 0;
+ char *q, c, c2;
+
+ if (ep->class == EPD_NULL && ep->length == 0)
+ return "null";
+ if (ep->class == EPD_IP && ep->length == 4) {
+ u_int32_t addr;
+
+ GETLONG(addr, p);
+ slprintf(str, sizeof(str), "IP:%I", htonl(addr));
+ return str;
+ }
+
+ c = ':';
+ c2 = '.';
+ if (ep->class == EPD_MAC && ep->length == 6)
+ c2 = ':';
+ else if (ep->class == EPD_MAGIC && (ep->length % 4) == 0)
+ mask = 3;
+ q = str;
+ if (ep->class <= EPD_PHONENUM)
+ q += slprintf(q, sizeof(str)-1, "%s",
+ endp_class_names[ep->class]);
+ else
+ q += slprintf(q, sizeof(str)-1, "%d", ep->class);
+ c = ':';
+ for (i = 0; i < ep->length && i < MAX_ENDP_LEN; ++i) {
+ if ((i & mask) == 0) {
+ *q++ = c;
+ c = c2;
+ }
+ q += slprintf(q, str + sizeof(str) - q, "%.2x", ep->value[i]);
+ }
+ return str;
+}
+
+static int hexc_val(int c)
+{
+ if (c >= 'a')
+ return c - 'a' + 10;
+ if (c >= 'A')
+ return c - 'A' + 10;
+ return c - '0';
+}
+
+int
+str_to_epdisc(ep, str)
+ struct epdisc *ep;
+ char *str;
+{
+ int i, l;
+ char *p, *endp;
+
+ for (i = EPD_NULL; i <= EPD_PHONENUM; ++i) {
+ int sl = strlen(endp_class_names[i]);
+ if (strncasecmp(str, endp_class_names[i], sl) == 0) {
+ str += sl;
+ break;
+ }
+ }
+ if (i > EPD_PHONENUM) {
+ /* not a class name, try a decimal class number */
+ i = strtol(str, &endp, 10);
+ if (endp == str)
+ return 0; /* can't parse class number */
+ str = endp;
+ }
+ ep->class = i;
+ if (*str == 0) {
+ ep->length = 0;
+ return 1;
+ }
+ if (*str != ':' && *str != '.')
+ return 0;
+ ++str;
+
+ if (i == EPD_IP) {
+ u_int32_t addr;
+ i = parse_dotted_ip(str, &addr);
+ if (i == 0 || str[i] != 0)
+ return 0;
+ set_ip_epdisc(ep, addr);
+ dbglog("str_to_epdisc -> %s", epdisc_to_str(ep));
+ return 1;
+ }
+ if (i == EPD_MAC && get_if_hwaddr(ep->value, str) >= 0) {
+ ep->length = 6;
+ dbglog("str_to_epdisc -> %s", epdisc_to_str(ep));
+ return 1;
+ }
+
+ p = str;
+ for (l = 0; l < MAX_ENDP_LEN; ++l) {
+ if (*str == 0)
+ break;
+ if (p <= str)
+ for (p = str; isxdigit(*p); ++p)
+ ;
+ i = p - str;
+ if (i == 0)
+ return 0;
+ ep->value[l] = hexc_val(*str++);
+ if ((i & 1) == 0)
+ ep->value[l] = (ep->value[l] << 4) + hexc_val(*str++);
+ if (*str == ':' || *str == '.')
+ ++str;
+ }
+ if (*str != 0 || (ep->class == EPD_MAC && l != 6))
+ return 0;
+ ep->length = l;
+ dbglog("str_to_epdisc -> %s", epdisc_to_str(ep));
+ return 1;
+}
projects / ppp.git / commitdiff