1 /*
2 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
19 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
21 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
25 * OF SUCH DAMAGE.
26 *
27 * This file is part of the lwIP TCP/IP stack.
28 *
29 * Author: Adam Dunkels <adam@sics.se>
30 *
31 */
32
33 #ifndef linux /* Apparently, this doesn't work under Linux. */
34
35 #include "lwip/debug.h"
36
37 #include <fcntl.h>
38 #include <stdlib.h>
39 #include <stdio.h>
40 #include <unistd.h>
41 #include <sys/types.h>
42 #include <sys/uio.h>
43 #include <sys/socket.h>
44 #include <sys/un.h>
45 #include <sys/stat.h>
46 #include <netinet/in.h>
47 #include <arpa/inet.h>
48
49 #include <pcap.h>
50
51 #include "netif/etharp.h"
52
53 #include "lwip/stats.h"
54
55 #include "lwip/def.h"
56 #include "lwip/mem.h"
57 #include "lwip/pbuf.h"
58 #include "lwip/sys.h"
59
60 #include "lwip/ip.h"
61
62
63 struct pcapif {
64 pcap_t *pd;
65 sys_sem_t sem;
66 u8_t pkt[2048];
67 u32_t len;
68 u32_t lasttime;
69 struct pbuf *p;
70 struct eth_addr *ethaddr;
71 };
72
73 static char errbuf[PCAP_ERRBUF_SIZE];
74
75 /*-----------------------------------------------------------------------------------*/
76 static err_t
pcapif_output(struct netif * netif,struct pbuf * p,ip_addr_t * ipaddr)77 pcapif_output(struct netif *netif, struct pbuf *p,
78 ip_addr_t *ipaddr)
79 {
80 return ERR_OK;
81 }
82 /*-----------------------------------------------------------------------------------*/
83 static void
timeout(void * arg)84 timeout(void *arg)
85 {
86 struct netif *netif;
87 struct pcapif *pcapif;
88 struct pbuf *p;
89 struct eth_hdr *ethhdr;
90
91 netif = (struct netif *)arg;
92 pcapif = netif->state;
93 ethhdr = (struct eth_hdr *)pcapif->pkt;
94
95
96 if (lwip_htons(ethhdr->type) != ETHTYPE_IP ||
97 ip_lookup(pcapif->pkt + 14, netif)) {
98
99 /* We allocate a pbuf chain of pbufs from the pool. */
100 p = pbuf_alloc(PBUF_LINK, pcapif->len, PBUF_POOL);
101
102 if (p != NULL) {
103 pbuf_take(p, pcapif->pkt, pcapif->len);
104
105 ethhdr = p->payload;
106 switch (lwip_htons(ethhdr->type)) {
107 /* IP or ARP packet? */
108 case ETHTYPE_IP:
109 case ETHTYPE_ARP:
110 #if PPPOE_SUPPORT
111 /* PPPoE packet? */
112 case ETHTYPE_PPPOEDISC:
113 case ETHTYPE_PPPOE:
114 #endif /* PPPOE_SUPPORT */
115 /* full packet send to tcpip_thread to process */
116 if (netif->input(p, netif) != ERR_OK) {
117 LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
118 pbuf_free(p);
119 p = NULL;
120 }
121 break;
122 default:
123 pbuf_free(p);
124 break;
125 }
126 }
127 } else {
128 printf("ip_lookup dropped\n");
129 }
130
131 sys_sem_signal(&pcapif->sem);
132 }
133 /*-----------------------------------------------------------------------------------*/
134 static void
callback(u_char * arg,const struct pcap_pkthdr * hdr,const u_char * pkt)135 callback(u_char *arg, const struct pcap_pkthdr *hdr, const u_char *pkt)
136 {
137 struct netif *netif;
138 struct pcapif *pcapif;
139 u32_t time, lasttime;
140
141 netif = (struct netif *)arg;
142 pcapif = netif->state;
143
144 pcapif->len = hdr->len;
145
146 bcopy(pkt, pcapif->pkt, hdr->len);
147
148 time = hdr->ts.tv_sec * 1000 + hdr->ts.tv_usec / 1000;
149
150 lasttime = pcapif->lasttime;
151 pcapif->lasttime = time;
152
153
154 if (lasttime == 0) {
155 sys_timeout(1000, timeout, netif);
156 } else {
157 sys_timeout(time - lasttime, timeout, netif);
158 }
159 }
160 /*-----------------------------------------------------------------------------------*/
161 static void
pcapif_thread(void * arg)162 pcapif_thread(void *arg)
163 {
164 struct netif *netif;
165 struct pcapif *pcapif;
166 netif = arg;
167 pcapif = netif->state;
168
169 while (1) {
170 pcap_loop(pcapif->pd, 1, callback, (u_char *)netif);
171 sys_sem_wait(&pcapif->sem);
172 if (pcapif->p != NULL) {
173 netif->input(pcapif->p, netif);
174 }
175 }
176 }
177 /*-----------------------------------------------------------------------------------*/
178 err_t
pcapif_init(struct netif * netif)179 pcapif_init(struct netif *netif)
180 {
181 struct pcapif *p;
182
183 p = malloc(sizeof(struct pcapif));
184 if (p == NULL)
185 return ERR_MEM;
186 netif->state = p;
187 netif->name[0] = 'p';
188 netif->name[1] = 'c';
189 netif->output = pcapif_output;
190
191 p->pd = pcap_open_offline("pcapdump", errbuf);
192 if (p->pd == NULL) {
193 printf("pcapif_init: failed %s\n", errbuf);
194 return ERR_IF;
195 }
196
197 if(sys_sem_new(&p->sem, 0) != ERR_OK) {
198 LWIP_ASSERT("Failed to create semaphore", 0);
199 }
200 p->p = NULL;
201 p->lasttime = 0;
202
203 sys_thread_new("pcapif_thread", pcapif_thread, netif, DEFAULT_THREAD_STACKSIZE, DEFAULT_THREAD_PRIO);
204 return ERR_OK;
205 }
206 /*-----------------------------------------------------------------------------------*/
207 #endif /* linux */
208