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ppp: rework host-uniq support to take hex encoded strings

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The previous implementation of the "host-uniq" option used plain strings for
passing the value to pppd which made it impossible to specify binary data.

Switch the format to a hex encoded string to support binary data.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

SVN-Revision: 44094
This commit is contained in:
Jo-Philipp Wich 2015-01-24 11:30:45 +00:00
parent c71cf8e6e4
commit 639f388fc2
3 changed files with 149 additions and 49 deletions
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4
package/network/services/ppp/Makefile
View file

@ -1,5 +1,5 @@
#
# Copyright (C) 2006-2014 OpenWrt.org
# Copyright (C) 2006-2015 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
@ -10,7 +10,7 @@ include $(INCLUDE_DIR)/kernel.mk
PKG_NAME:=ppp
PKG_VERSION:=2.4.7
PKG_RELEASE:=4
PKG_RELEASE:=5
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
PKG_SOURCE_URL:=ftp://ftp.samba.org/pub/ppp/

6
package/network/services/ppp/files/ppp.sh
View file

@ -113,7 +113,7 @@ proto_pppoe_init_config() {
ppp_generic_init_config
proto_config_add_string "ac"
proto_config_add_string "service"
proto_config_add_string host_uniq
proto_config_add_string "host_uniq"
}
proto_pppoe_setup() {
@ -135,8 +135,8 @@ proto_pppoe_setup() {
plugin rp-pppoe.so \
${ac:+rp_pppoe_ac "$ac"} \
${service:+rp_pppoe_service "$service"} \
"nic-$iface" \
${host_uniq:+host-uniq "$host_uniq"}
${host_uniq:+host-uniq "$host_uniq"} \
"nic-$iface"
}
proto_pppoe_teardown() {

188
package/network/services/ppp/patches/520-uniq.patch
View file

@ -1,20 +1,21 @@
--- a/pppd/plugins/rp-pppoe/common.c
+++ b/pppd/plugins/rp-pppoe/common.c
@@ -121,13 +121,13 @@ sendPADT(PPPoEConnection *conn, char con
@@ -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;
- if (conn->useHostUniq) {
- PPPoETag hostUniq;
- pid_t pid = getpid();
+ int len = strlen(conn->useHostUniq);
hostUniq.type = htons(TAG_HOST_UNIQ);
- 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;
+ hostUniq.length = htons(len);
+ memcpy(hostUniq.payload, conn->useHostUniq, len);
+ memcpy(cursor, &hostUniq, len + 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;
}
@ -22,65 +23,86 @@
/* Copy error message */
--- a/pppd/plugins/rp-pppoe/discovery.c
+++ b/pppd/plugins/rp-pppoe/discovery.c
@@ -104,7 +104,7 @@ parseForHostUniq(UINT16_t type, UINT16_t
@@ -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;
+ char *uniq = conn->useHostUniq;
+ 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;
@@ -112,8 +112,8 @@ packetIsForMe(PPPoEConnection *conn, PPP
/* If we're not using the Host-Unique tag, then accept the packet */
if (!conn->useHostUniq) return 1;
- if (!conn->useHostUniq) return 1;
+ if (!conn->hostUniq.length) return 1;
- parsePacket(packet, parseForHostUniq, &forMe);
- return forMe;
+ parsePacket(packet, parseForHostUniq, &uniq);
+ return uniq != 0;
+ parsePacket(packet, parseForHostUniq, &hostUniq);
+ return (hostUniq.length == 0);
}
/**********************************************************************
@@ -303,14 +303,14 @@ sendPADI(PPPoEConnection *conn)
@@ -301,16 +298,12 @@ sendPADI(PPPoEConnection *conn)
}
/* If we're using Host-Uniq, copy it over */
if (conn->useHostUniq) {
PPPoETag hostUniq;
- if (conn->useHostUniq) {
- PPPoETag hostUniq;
- pid_t pid = getpid();
+ int len = strlen(conn->useHostUniq);
hostUniq.type = htons(TAG_HOST_UNIQ);
- 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;
+ hostUniq.length = htons(len);
+ memcpy(hostUniq.payload, conn->useHostUniq, len);
+ if (conn->hostUniq.length) {
+ int len = ntohs(conn->hostUniq.length);
+ CHECK_ROOM(cursor, packet.payload, len + TAG_HDR_SIZE);
+ memcpy(cursor, &hostUniq, 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 */
@@ -480,14 +480,14 @@ sendPADR(PPPoEConnection *conn)
@@ -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;
- if (conn->useHostUniq) {
- PPPoETag hostUniq;
- pid_t pid = getpid();
+ int len = strlen(conn->useHostUniq);
hostUniq.type = htons(TAG_HOST_UNIQ);
- 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;
+ hostUniq.length = htons(len);
+ memcpy(hostUniq.payload, conn->useHostUniq, len);
+ if (conn->hostUniq.length) {
+ int len = ntohs(conn->hostUniq.length);
+ CHECK_ROOM(cursor, packet.payload, len+TAG_HDR_SIZE);
+ memcpy(cursor, &hostUniq, len + TAG_HDR_SIZE);
+ memcpy(cursor, &conn->hostUniq, len + TAG_HDR_SIZE);
+ cursor += len + TAG_HDR_SIZE;
+ plen += len + TAG_HDR_SIZE;
}
@ -105,28 +127,59 @@
{ NULL }
};
int (*OldDevnameHook)(char *cmd, char **argv, int doit) = NULL;
@@ -107,7 +110,7 @@ PPPOEInitDevice(void)
@@ -107,7 +110,6 @@ PPPOEInitDevice(void)
conn->ifName = devnam;
conn->discoverySocket = -1;
conn->sessionSocket = -1;
- conn->useHostUniq = 1;
+ conn->useHostUniq = NULL;
conn->printACNames = printACNames;
conn->discoveryTimeout = PADI_TIMEOUT;
return 1;
@@ -163,6 +166,9 @@ PPPOEConnectDevice(void)
@@ -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)
+ conn->useHostUniq = host_uniq;
+ 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
@@ -641,7 +641,7 @@ int main(int argc, char *argv[])
@@ -344,7 +344,7 @@ 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;
@@ -470,16 +470,12 @@ 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);
@@ -641,7 +637,7 @@ int main(int argc, char *argv[])
memset(conn, 0, sizeof(PPPoEConnection));
@ -135,35 +188,82 @@
switch(opt) {
case 'S':
conn->serviceName = xstrdup(optarg);
@@ -650,7 +650,19 @@ int main(int argc, char *argv[])
@@ -650,7 +646,23 @@ int main(int argc, char *argv[])
conn->acName = xstrdup(optarg);
break;
case 'U':
- conn->useHostUniq = 1;
+ if(conn->useHostUniq) {
+ if(conn->hostUniq.length) {
+ fprintf(stderr, "-U and -W are mutually exclusive\n");
+ exit(EXIT_FAILURE);
+ }
+ conn->useHostUniq = malloc(12);
+ snprintf(conn->useHostUniq, 12, "%d", getpid());
+ char pidbuf[5];
+ snprintf(pidbuf, sizeof(pidbuf), "%04x", getpid());
+ parseHostUniq(pidbuf, &conn->hostUniq);
+ break;
+ case 'W':
+ if(conn->useHostUniq) {
+ if(conn->hostUniq.length) {
+ fprintf(stderr, "-U and -W are mutually exclusive\n");
+ exit(EXIT_FAILURE);
+ }
+ conn->useHostUniq = xstrdup(optarg);
+ 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
@@ -224,7 +224,7 @@ typedef struct PPPoEConnectionStruct {
@@ -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
@@ -224,7 +226,7 @@ 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 */
+ char *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 */
@@ -280,6 +282,33 @@ 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) \