this one is also needed for multilink :-)
authorPaul Mackerras <paulus@samba.org>
Tue, 4 Apr 2000 07:08:12 +0000 (07:08 +0000)
committerPaul Mackerras <paulus@samba.org>
Tue, 4 Apr 2000 07:08:12 +0000 (07:08 +0000)
pppd/multilink.c [new file with mode: 0644]

diff --git a/pppd/multilink.c b/pppd/multilink.c
new file mode 100644 (file)
index 0000000..7a81659
--- /dev/null
@@ -0,0 +1,325 @@
+/*
+ * 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;
+}