/[dynamips]/upstream/dynamips-0.2.6-RC3/gen_eth.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Annotation of /upstream/dynamips-0.2.6-RC3/gen_eth.c

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Revision 1 - (hide annotations)
Sat Oct 6 16:01:44 2007 UTC (14 years, 10 months ago) by dpavlin
Original Path: upstream/dynamips-0.2.5/gen_eth.c
File MIME type: text/plain
File size: 2754 byte(s)
import 0.2.5 from upstream

1 dpavlin 1 /*
2     * Copyright (c) 2006 Christophe Fillot.
3     * E-mail: cf@utc.fr
4     *
5     * gen_eth.c: module used to send/receive Ethernet packets.
6     *
7     * Use libpcap (0.9+) or WinPcap (0.4alpha1+) to receive and send packets.
8     */
9    
10     #include <stdio.h>
11     #include <stdlib.h>
12     #include <string.h>
13     #include <stdarg.h>
14     #include <unistd.h>
15     #include <errno.h>
16     #include <signal.h>
17     #include <fcntl.h>
18     #include <ctype.h>
19     #include <netdb.h>
20     #include <sys/time.h>
21     #include <sys/stat.h>
22     #include <sys/types.h>
23     #include <sys/socket.h>
24     #include <sys/wait.h>
25     #include <netinet/in.h>
26     #include <arpa/inet.h>
27     #include <pthread.h>
28    
29     #ifdef CYGWIN
30     /* Needed for pcap_open() flags */
31     #define HAVE_REMOTE
32     #endif
33    
34     #include "pcap.h"
35     #include "utils.h"
36     #include "gen_eth.h"
37    
38     /* Initialize a generic ethernet driver */
39     pcap_t *gen_eth_init(char *device)
40     {
41     char pcap_errbuf[PCAP_ERRBUF_SIZE];
42     pcap_t *p;
43    
44     #ifndef CYGWIN
45     if (!(p = pcap_open_live(device,2048,TRUE,10,pcap_errbuf)))
46     goto pcap_error;
47    
48     /* Accept only incoming packets */
49     pcap_setdirection(p,PCAP_D_IN);
50     #else
51     p = pcap_open(device,2048,
52     PCAP_OPENFLAG_PROMISCUOUS |
53     PCAP_OPENFLAG_NOCAPTURE_LOCAL |
54     PCAP_OPENFLAG_MAX_RESPONSIVENESS |
55     PCAP_OPENFLAG_NOCAPTURE_RPCAP,
56     10,NULL,pcap_errbuf);
57    
58     if (!p)
59     goto pcap_error;
60     #endif
61    
62     return p;
63    
64     pcap_error:
65     fprintf(stderr,"gen_eth_init: unable to open device '%s' "
66     "with PCAP (%s)\n",device,pcap_errbuf);
67     return NULL;
68     }
69    
70     /* Free resources of a generic ethernet driver */
71     void gen_eth_close(pcap_t *p)
72     {
73     pcap_close(p);
74     }
75    
76     /* Send an ethernet frame */
77     ssize_t gen_eth_send(pcap_t *p,char *buffer,size_t len)
78     {
79     return(pcap_sendpacket(p,(u_char *)buffer,len));
80     }
81    
82     /* Receive an ethernet frame */
83     ssize_t gen_eth_recv(pcap_t *p,char *buffer,size_t len)
84     {
85     struct pcap_pkthdr pkt_info;
86     u_char *pkt_ptr;
87     ssize_t rlen;
88    
89     if (!(pkt_ptr = (u_char *)pcap_next(p,&pkt_info)))
90     return(-1);
91    
92     rlen = m_min(len,pkt_info.caplen);
93    
94     memcpy(buffer,pkt_ptr,rlen);
95     return(rlen);
96     }
97    
98     /* Display Ethernet interfaces of the system */
99     int gen_eth_show_dev_list(void)
100     {
101     char pcap_errbuf[PCAP_ERRBUF_SIZE];
102     pcap_if_t *dev_list,*dev;
103     int res;
104    
105     printf("Network device list:\n\n");
106    
107     #ifndef CYGWIN
108     res = pcap_findalldevs(&dev_list,pcap_errbuf);
109     #else
110     res = pcap_findalldevs_ex(PCAP_SRC_IF_STRING,NULL,&dev_list,pcap_errbuf);
111     #endif
112    
113     if (res < 0) {
114     fprintf(stderr,"PCAP: unable to find device list (%s)\n",pcap_errbuf);
115     return(-1);
116     }
117    
118     for(dev=dev_list;dev;dev=dev->next) {
119     printf(" %s : %s\n",
120     dev->name,
121     dev->description ? dev->description : "no info provided");
122     }
123    
124     printf("\n");
125    
126     pcap_freealldevs(dev_list);
127     return(0);
128     }

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