aboutsummaryrefslogtreecommitdiffstats
path: root/package/network/services/ppp/patches/520-uniq.patch
blob: fddb07f253a46de6a99ae257e4c9060b0d50e3e3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
--- a/pppd/plugins/rp-pppoe/common.c
+++ b/pppd/plugins/rp-pppoe/common.c
@@ -119,15 +119,11 @@ sendPADT(PPPoEConnection *conn, char con
     conn->session = 0;
 
     /* If we're using Host-Uniq, copy it over */
-    if (conn->useHostUniq) {
-	PPPoETag hostUniq;
-	pid_t pid = getpid();
-	hostUniq.type = htons(TAG_HOST_UNIQ);
-	hostUniq.length = htons(sizeof(pid));
-	memcpy(hostUniq.payload, &pid, sizeof(pid));
-	memcpy(cursor, &hostUniq, sizeof(pid) + TAG_HDR_SIZE);
-	cursor += sizeof(pid) + TAG_HDR_SIZE;
-	plen += sizeof(pid) + TAG_HDR_SIZE;
+    if (conn->hostUniq.length) {
+	int len = ntohs(conn->hostUniq.length);
+	memcpy(cursor, &conn->hostUniq, len + TAG_HDR_SIZE);
+	cursor += len + TAG_HDR_SIZE;
+	plen += len + TAG_HDR_SIZE;
     }
 
     /* Copy error message */
--- a/pppd/plugins/rp-pppoe/discovery.c
+++ b/pppd/plugins/rp-pppoe/discovery.c
@@ -80,13 +80,10 @@ static void
 parseForHostUniq(UINT16_t type, UINT16_t len, unsigned char *data,
 		 void *extra)
 {
-    int *val = (int *) extra;
-    if (type == TAG_HOST_UNIQ && len == sizeof(pid_t)) {
-	pid_t tmp;
-	memcpy(&tmp, data, len);
-	if (tmp == getpid()) {
-	    *val = 1;
-	}
+    PPPoETag *tag = extra;
+
+    if (type == TAG_HOST_UNIQ && len == ntohs(tag->length)) {
+	tag->length = memcmp(data, tag->payload, len);
     }
 }
 
@@ -104,16 +101,16 @@ parseForHostUniq(UINT16_t type, UINT16_t
 static int
 packetIsForMe(PPPoEConnection *conn, PPPoEPacket *packet)
 {
-    int forMe = 0;
+    PPPoETag hostUniq = conn->hostUniq;
 
     /* If packet is not directed to our MAC address, forget it */
     if (memcmp(packet->ethHdr.h_dest, conn->myEth, ETH_ALEN)) return 0;
 
     /* If we're not using the Host-Unique tag, then accept the packet */
-    if (!conn->useHostUniq) return 1;
+    if (!conn->hostUniq.length) return 1;
 
-    parsePacket(packet, parseForHostUniq, &forMe);
-    return forMe;
+    parsePacket(packet, parseForHostUniq, &hostUniq);
+    return (hostUniq.length == 0);
 }
 
 /**********************************************************************
@@ -301,16 +298,12 @@ sendPADI(PPPoEConnection *conn)
     }
 
     /* If we're using Host-Uniq, copy it over */
-    if (conn->useHostUniq) {
-	PPPoETag hostUniq;
-	pid_t pid = getpid();
-	hostUniq.type = htons(TAG_HOST_UNIQ);
-	hostUniq.length = htons(sizeof(pid));
-	memcpy(hostUniq.payload, &pid, sizeof(pid));
-	CHECK_ROOM(cursor, packet.payload, sizeof(pid) + TAG_HDR_SIZE);
-	memcpy(cursor, &hostUniq, sizeof(pid) + TAG_HDR_SIZE);
-	cursor += sizeof(pid) + TAG_HDR_SIZE;
-	plen += sizeof(pid) + TAG_HDR_SIZE;
+    if (conn->hostUniq.length) {
+	int len = ntohs(conn->hostUniq.length);
+	CHECK_ROOM(cursor, packet.payload, len + TAG_HDR_SIZE);
+	memcpy(cursor, &conn->hostUniq, len + TAG_HDR_SIZE);
+	cursor += len + TAG_HDR_SIZE;
+	plen += len + TAG_HDR_SIZE;
     }
 
     /* Add our maximum MTU/MRU */
@@ -478,16 +471,12 @@ sendPADR(PPPoEConnection *conn)
     cursor += namelen + TAG_HDR_SIZE;
 
     /* If we're using Host-Uniq, copy it over */
-    if (conn->useHostUniq) {
-	PPPoETag hostUniq;
-	pid_t pid = getpid();
-	hostUniq.type = htons(TAG_HOST_UNIQ);
-	hostUniq.length = htons(sizeof(pid));
-	memcpy(hostUniq.payload, &pid, sizeof(pid));
-	CHECK_ROOM(cursor, packet.payload, sizeof(pid)+TAG_HDR_SIZE);
-	memcpy(cursor, &hostUniq, sizeof(pid) + TAG_HDR_SIZE);
-	cursor += sizeof(pid) + TAG_HDR_SIZE;
-	plen += sizeof(pid) + TAG_HDR_SIZE;
+    if (conn->hostUniq.length) {
+	int len = ntohs(conn->hostUniq.length);
+	CHECK_ROOM(cursor, packet.payload, len+TAG_HDR_SIZE);
+	memcpy(cursor, &conn->hostUniq, len + TAG_HDR_SIZE);
+	cursor += len + TAG_HDR_SIZE;
+	plen += len + TAG_HDR_SIZE;
     }
 
     /* Add our maximum MTU/MRU */
--- a/pppd/plugins/rp-pppoe/plugin.c
+++ b/pppd/plugins/rp-pppoe/plugin.c
@@ -65,6 +65,7 @@ static char *existingSession = NULL;
 static int printACNames = 0;
 static char *pppoe_reqd_mac = NULL;
 unsigned char pppoe_reqd_mac_addr[6];
+static char *host_uniq = NULL;
 
 static int PPPoEDevnameHook(char *cmd, char **argv, int doit);
 static option_t Options[] = {
@@ -82,6 +83,8 @@ static option_t Options[] = {
       "Be verbose about discovered access concentrators"},
     { "pppoe-mac", o_string, &pppoe_reqd_mac,
       "Only connect to specified MAC address" },
+    { "host-uniq", o_string, &host_uniq,
+      "Specify custom Host-Uniq" },
     { NULL }
 };
 int (*OldDevnameHook)(char *cmd, char **argv, int doit) = NULL;
@@ -107,7 +110,6 @@ PPPOEInitDevice(void)
     conn->ifName = devnam;
     conn->discoverySocket = -1;
     conn->sessionSocket = -1;
-    conn->useHostUniq = 1;
     conn->printACNames = printACNames;
     conn->discoveryTimeout = PADI_TIMEOUT;
     return 1;
@@ -163,6 +165,9 @@ PPPOEConnectDevice(void)
     if (lcp_wantoptions[0].mru > ifr.ifr_mtu - TOTAL_OVERHEAD)
 	lcp_wantoptions[0].mru = ifr.ifr_mtu - TOTAL_OVERHEAD;
 
+    if (host_uniq && !parseHostUniq(host_uniq, &conn->hostUniq))
+	fatal("Illegal value for host-uniq option");
+
     conn->acName = acName;
     conn->serviceName = pppd_pppoe_service;
     strlcpy(ppp_devnam, devnam, sizeof(ppp_devnam));
--- a/pppd/plugins/rp-pppoe/pppoe-discovery.c
+++ b/pppd/plugins/rp-pppoe/pppoe-discovery.c
@@ -356,7 +356,7 @@ packetIsForMe(PPPoEConnection *conn, PPP
     if (memcmp(packet->ethHdr.h_dest, conn->myEth, ETH_ALEN)) return 0;
 
     /* If we're not using the Host-Unique tag, then accept the packet */
-    if (!conn->useHostUniq) return 1;
+    if (!conn->hostUniq.length) return 1;
 
     parsePacket(packet, parseForHostUniq, &forMe);
     return forMe;
@@ -494,16 +494,12 @@ sendPADI(PPPoEConnection *conn)
     cursor += namelen + TAG_HDR_SIZE;
 
     /* If we're using Host-Uniq, copy it over */
-    if (conn->useHostUniq) {
-	PPPoETag hostUniq;
-	pid_t pid = getpid();
-	hostUniq.type = htons(TAG_HOST_UNIQ);
-	hostUniq.length = htons(sizeof(pid));
-	memcpy(hostUniq.payload, &pid, sizeof(pid));
-	CHECK_ROOM(cursor, packet.payload, sizeof(pid) + TAG_HDR_SIZE);
-	memcpy(cursor, &hostUniq, sizeof(pid) + TAG_HDR_SIZE);
-	cursor += sizeof(pid) + TAG_HDR_SIZE;
-	plen += sizeof(pid) + TAG_HDR_SIZE;
+    if (conn->hostUniq.length) {
+	int len = ntohs(conn->hostUniq.length);
+	CHECK_ROOM(cursor, packet.payload, len + TAG_HDR_SIZE);
+	memcpy(cursor, &conn->hostUniq, len + TAG_HDR_SIZE);
+	cursor += len + TAG_HDR_SIZE;
+	plen += len + TAG_HDR_SIZE;
     }
 
     packet.length = htons(plen);
@@ -669,7 +665,7 @@ int main(int argc, char *argv[])
     conn->discoveryTimeout = PADI_TIMEOUT;
     conn->discoveryAttempts = MAX_PADI_ATTEMPTS;
 
-    while ((opt = getopt(argc, argv, "I:D:VUQS:C:t:a:h")) > 0) {
+    while ((opt = getopt(argc, argv, "I:D:VUW:QS:C:t:a:h")) > 0) {
 	switch(opt) {
 	case 'S':
 	    conn->serviceName = xstrdup(optarg);
@@ -696,7 +692,23 @@ int main(int argc, char *argv[])
 	    }
 	    break;
 	case 'U':
-	    conn->useHostUniq = 1;
+	    if(conn->hostUniq.length) {
+		fprintf(stderr, "-U and -W are mutually exclusive\n");
+		exit(EXIT_FAILURE);
+	    }
+            char pidbuf[5];
+            snprintf(pidbuf, sizeof(pidbuf), "%04x", getpid());
+            parseHostUniq(pidbuf, &conn->hostUniq);
+	    break;
+	case 'W':
+	    if(conn->hostUniq.length) {
+		fprintf(stderr, "-U and -W are mutually exclusive\n");
+		exit(EXIT_FAILURE);
+	    }
+	    if (!parseHostUniq(optarg, &conn->hostUniq)) {
+                fprintf(stderr, "Invalid host-uniq argument: %s\n", optarg);
+                exit(EXIT_FAILURE);
+            }
 	    break;
 	case 'D':
 	    conn->debugFile = fopen(optarg, "w");
--- a/pppd/plugins/rp-pppoe/pppoe.h
+++ b/pppd/plugins/rp-pppoe/pppoe.h
@@ -21,6 +21,8 @@
 
 #include <stdio.h>		/* For FILE */
 #include <sys/types.h>		/* For pid_t */
+#include <ctype.h>
+#include <string.h>
 
 /* How do we access raw Ethernet devices? */
 #undef USE_LINUX_PACKET
@@ -219,7 +221,7 @@ typedef struct PPPoEConnectionStruct {
     char *serviceName;		/* Desired service name, if any */
     char *acName;		/* Desired AC name, if any */
     int synchronous;		/* Use synchronous PPP */
-    int useHostUniq;		/* Use Host-Uniq tag */
+    PPPoETag hostUniq;		/* Use Host-Uniq tag */
     int printACNames;		/* Just print AC names */
     FILE *debugFile;		/* Debug file for dumping packets */
     int numPADOs;		/* Number of PADO packets received */
@@ -276,6 +278,33 @@ void pppoe_printpkt(PPPoEPacket *packet,
 		    void (*printer)(void *, char *, ...), void *arg);
 void pppoe_log_packet(const char *prefix, PPPoEPacket *packet);
 
+static inline int parseHostUniq(const char *uniq, PPPoETag *tag)
+{
+    int i, len = strlen(uniq);
+
+#define hex(x) \
+    (((x) <= '9') ? ((x) - '0') : \
+        (((x) <= 'F') ? ((x) - 'A' + 10) : \
+            ((x) - 'a' + 10)))
+
+    if (len % 2)
+        return 0;
+
+    for (i = 0; i < len; i += 2)
+    {
+        if (!isxdigit(uniq[i]) || !isxdigit(uniq[i+1]))
+            return 0;
+
+        tag->payload[i / 2] = (char)(16 * hex(uniq[i]) + hex(uniq[i+1]));
+    }
+
+#undef hex
+
+    tag->type = htons(TAG_HOST_UNIQ);
+    tag->length = htons(len / 2);
+    return 1;
+}
+
 #define SET_STRING(var, val) do { if (var) free(var); var = strDup(val); } while(0);
 
 #define CHECK_ROOM(cursor, start, len) \