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Darren Reedbd81eb32006-06-15 16:06:55 +00001/*
2 * resend.c (C) 1995-1998 Darren Reed
3 *
Darren Reed9e45c8c2006-06-15 16:31:54 +00004 * See the IPFILTER.LICENCE file for details on licencing.
Darren Reedbd81eb32006-06-15 16:06:55 +00005 *
Darren Reedbd81eb32006-06-15 16:06:55 +00006 */
7#if !defined(lint)
8static const char sccsid[] = "@(#)resend.c 1.3 1/11/96 (C)1995 Darren Reed";
9static const char rcsid[] = "@(#)$Id$";
10#endif
Darren Reed9e45c8c2006-06-15 16:31:54 +000011#include <sys/param.h>
Darren Reedbd81eb32006-06-15 16:06:55 +000012#include <sys/types.h>
13#include <sys/time.h>
14#include <sys/socket.h>
15#include <net/if.h>
16#include <netinet/in.h>
17#include <arpa/inet.h>
18#include <netinet/in_systm.h>
19#include <netinet/ip.h>
Darren Reedbd81eb32006-06-15 16:06:55 +000020#ifndef linux
21# include <netinet/ip_var.h>
22# include <netinet/if_ether.h>
23# if __FreeBSD_version >= 300000
24# include <net/if_var.h>
25# endif
26#endif
Darren Reed9e45c8c2006-06-15 16:31:54 +000027#include <stdio.h>
28#include <netdb.h>
29#include <string.h>
30#include <stdlib.h>
31#include <unistd.h>
Darren Reedbd81eb32006-06-15 16:06:55 +000032#include "ipsend.h"
33
34extern int opts;
35
Darren Reedc4af1f32007-08-20 10:15:33 +000036void dumppacket __P((ip_t *));
Darren Reedbd81eb32006-06-15 16:06:55 +000037
38
Darren Reedc4af1f32007-08-20 10:15:33 +000039void dumppacket(ip)
Martti Kuparinen74b6c5c2007-10-25 12:55:40 +000040 ip_t *ip;
Darren Reedbd81eb32006-06-15 16:06:55 +000041{
42 tcphdr_t *t;
43 int i, j;
44
Darren Reed9e45c8c2006-06-15 16:31:54 +000045 t = (tcphdr_t *)((char *)ip + (IP_HL(ip) << 2));
Darren Reedbd81eb32006-06-15 16:06:55 +000046 if (ip->ip_tos)
47 printf("tos %#x ", ip->ip_tos);
48 if (ip->ip_off & 0x3fff)
49 printf("frag @%#x ", (ip->ip_off & 0x1fff) << 3);
50 printf("len %d id %d ", ip->ip_len, ip->ip_id);
51 printf("ttl %d p %d src %s", ip->ip_ttl, ip->ip_p,
52 inet_ntoa(ip->ip_src));
53 if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP)
54 printf(",%d", t->th_sport);
55 printf(" dst %s", inet_ntoa(ip->ip_dst));
56 if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP)
57 printf(",%d", t->th_dport);
58 if (ip->ip_p == IPPROTO_TCP) {
59 printf(" seq %lu:%lu flags ",
60 (u_long)t->th_seq, (u_long)t->th_ack);
61 for (j = 0, i = 1; i < 256; i *= 2, j++)
62 if (t->th_flags & i)
63 printf("%c", "FSRPAU--"[j]);
64 }
65 putchar('\n');
66}
67
68
69int ip_resend(dev, mtu, r, gwip, datain)
Martti Kuparinen74b6c5c2007-10-25 12:55:40 +000070 char *dev;
71 int mtu;
72 struct in_addr gwip;
73 struct ipread *r;
74 char *datain;
Darren Reedbd81eb32006-06-15 16:06:55 +000075{
76 ether_header_t *eh;
77 char dhost[6];
78 ip_t *ip;
Darren Reed9e45c8c2006-06-15 16:31:54 +000079 int fd, wfd = initdevice(dev, 5), len, i;
Darren Reed88151e32007-10-10 09:37:06 +000080 mb_t mb;
Darren Reedbd81eb32006-06-15 16:06:55 +000081
Darren Reedd4718fc2006-06-15 17:00:40 +000082 if (wfd == -1)
83 return -1;
84
Darren Reedbd81eb32006-06-15 16:06:55 +000085 if (datain)
86 fd = (*r->r_open)(datain);
87 else
88 fd = (*r->r_open)("-");
Darren Reed9e45c8c2006-06-15 16:31:54 +000089
Darren Reedbd81eb32006-06-15 16:06:55 +000090 if (fd < 0)
91 exit(-1);
92
Darren Reed88151e32007-10-10 09:37:06 +000093 ip = (struct ip *)mb.mb_buf;
Darren Reedbd81eb32006-06-15 16:06:55 +000094 eh = (ether_header_t *)malloc(sizeof(*eh));
Darren Reed9e45c8c2006-06-15 16:31:54 +000095 if(!eh)
96 {
97 perror("malloc failed");
98 return -2;
99 }
Darren Reedbd81eb32006-06-15 16:06:55 +0000100
101 bzero((char *)A_A eh->ether_shost, sizeof(eh->ether_shost));
102 if (gwip.s_addr && (arp((char *)&gwip, dhost) == -1))
103 {
104 perror("arp");
Darren Reedd4718fc2006-06-15 17:00:40 +0000105 free(eh);
Darren Reedbd81eb32006-06-15 16:06:55 +0000106 return -2;
107 }
108
Darren Reed88151e32007-10-10 09:37:06 +0000109 while ((i = (*r->r_readip)(&mb, NULL, NULL)) > 0)
Darren Reedbd81eb32006-06-15 16:06:55 +0000110 {
111 if (!(opts & OPT_RAW)) {
112 len = ntohs(ip->ip_len);
113 eh = (ether_header_t *)realloc((char *)eh, sizeof(*eh) + len);
114 eh->ether_type = htons((u_short)ETHERTYPE_IP);
115 if (!gwip.s_addr) {
116 if (arp((char *)&gwip,
117 (char *)A_A eh->ether_dhost) == -1) {
118 perror("arp");
119 continue;
120 }
121 } else
122 bcopy(dhost, (char *)A_A eh->ether_dhost,
123 sizeof(dhost));
124 if (!ip->ip_sum)
125 ip->ip_sum = chksum((u_short *)ip,
Darren Reed9e45c8c2006-06-15 16:31:54 +0000126 IP_HL(ip) << 2);
Darren Reedbd81eb32006-06-15 16:06:55 +0000127 bcopy(ip, (char *)(eh + 1), len);
128 len += sizeof(*eh);
Darren Reedc4af1f32007-08-20 10:15:33 +0000129 dumppacket(ip);
Darren Reedbd81eb32006-06-15 16:06:55 +0000130 } else {
Darren Reed88151e32007-10-10 09:37:06 +0000131 eh = (ether_header_t *)mb.mb_buf;
Darren Reedbd81eb32006-06-15 16:06:55 +0000132 len = i;
133 }
134
135 if (sendip(wfd, (char *)eh, len) == -1)
136 {
137 perror("send_packet");
138 break;
139 }
140 }
141 (*r->r_close)();
Darren Reedd4718fc2006-06-15 17:00:40 +0000142 free(eh);
Darren Reedbd81eb32006-06-15 16:06:55 +0000143 return 0;
144}