diff options
Diffstat (limited to 'ipsend/resend.c')
| -rw-r--r-- | ipsend/resend.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/ipsend/resend.c b/ipsend/resend.c new file mode 100644 index 0000000..e7b1ef4 --- /dev/null +++ b/ipsend/resend.c @@ -0,0 +1,147 @@ +/* + * resend.c (C) 1995-1998 Darren Reed + * + * See the IPFILTER.LICENCE file for details on licencing. + * + */ +#if !defined(lint) +static const char sccsid[] = "@(#)resend.c 1.3 1/11/96 (C)1995 Darren Reed"; +static const char rcsid[] = "@(#)$Id: resend.c,v 2.8.2.3 2007/02/17 12:41:51 darrenr Exp $"; +#endif +#include <sys/param.h> +#include <sys/types.h> +#include <sys/time.h> +#include <sys/socket.h> +#ifdef __osf__ +# include "radix_ipf_local.h" +#endif +#include <net/if.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <netinet/in_systm.h> +#include <netinet/ip.h> +#ifndef linux +# include <netinet/ip_var.h> +# include <netinet/if_ether.h> +# if __FreeBSD_version >= 300000 +# include <net/if_var.h> +# endif +#endif +#include <stdio.h> +#include <netdb.h> +#include <string.h> +#include <stdlib.h> +#include <unistd.h> +#include "ipsend.h" + +extern int opts; + +static u_char pbuf[65536]; /* 1 big packet */ +void printpacket __P((ip_t *)); + + +void printpacket(ip) +ip_t *ip; +{ + tcphdr_t *t; + int i, j; + + t = (tcphdr_t *)((char *)ip + (IP_HL(ip) << 2)); + if (ip->ip_tos) + printf("tos %#x ", ip->ip_tos); + if (ip->ip_off & 0x3fff) + printf("frag @%#x ", (ip->ip_off & 0x1fff) << 3); + printf("len %d id %d ", ip->ip_len, ip->ip_id); + printf("ttl %d p %d src %s", ip->ip_ttl, ip->ip_p, + inet_ntoa(ip->ip_src)); + if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP) + printf(",%d", t->th_sport); + printf(" dst %s", inet_ntoa(ip->ip_dst)); + if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP) + printf(",%d", t->th_dport); + if (ip->ip_p == IPPROTO_TCP) { + printf(" seq %lu:%lu flags ", + (u_long)t->th_seq, (u_long)t->th_ack); + for (j = 0, i = 1; i < 256; i *= 2, j++) + if (t->th_flags & i) + printf("%c", "FSRPAU--"[j]); + } + putchar('\n'); +} + + +int ip_resend(dev, mtu, r, gwip, datain) +char *dev; +int mtu; +struct in_addr gwip; +struct ipread *r; +char *datain; +{ + ether_header_t *eh; + char dhost[6]; + ip_t *ip; + int fd, wfd = initdevice(dev, 5), len, i; + + if (wfd == -1) + return -1; + + if (datain) + fd = (*r->r_open)(datain); + else + fd = (*r->r_open)("-"); + + if (fd < 0) + exit(-1); + + ip = (struct ip *)pbuf; + eh = (ether_header_t *)malloc(sizeof(*eh)); + if(!eh) + { + perror("malloc failed"); + return -2; + } + + bzero((char *)A_A eh->ether_shost, sizeof(eh->ether_shost)); + if (gwip.s_addr && (arp((char *)&gwip, dhost) == -1)) + { + perror("arp"); + free(eh); + return -2; + } + + while ((i = (*r->r_readip)((char *)pbuf, sizeof(pbuf), NULL, NULL)) > 0) + { + if (!(opts & OPT_RAW)) { + len = ntohs(ip->ip_len); + eh = (ether_header_t *)realloc((char *)eh, sizeof(*eh) + len); + eh->ether_type = htons((u_short)ETHERTYPE_IP); + if (!gwip.s_addr) { + if (arp((char *)&gwip, + (char *)A_A eh->ether_dhost) == -1) { + perror("arp"); + continue; + } + } else + bcopy(dhost, (char *)A_A eh->ether_dhost, + sizeof(dhost)); + if (!ip->ip_sum) + ip->ip_sum = chksum((u_short *)ip, + IP_HL(ip) << 2); + bcopy(ip, (char *)(eh + 1), len); + len += sizeof(*eh); + printpacket(ip); + } else { + eh = (ether_header_t *)pbuf; + len = i; + } + + if (sendip(wfd, (char *)eh, len) == -1) + { + perror("send_packet"); + break; + } + } + (*r->r_close)(); + free(eh); + return 0; +} |
