From: hackbard Date: Thu, 19 Dec 2002 03:53:49 +0000 (+0000) Subject: added tcp support X-Git-Url: https://hackdaworld.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=91a86e79de34bb35c6abd72f6f71990de904915c;p=my-code%2Fhdw-sniff.git added tcp support --- diff --git a/hdw-sniff.c b/hdw-sniff.c index 8b35e82..d2e7077 100644 --- a/hdw-sniff.c +++ b/hdw-sniff.c @@ -4,6 +4,8 @@ * author: hackbard@hackdaworld.dyndns.org */ +#define _GNU_SOURCE + #include #include #include @@ -22,6 +24,7 @@ #include /* for ethhdr struct */ #include /* ip */ #include /* in_addr , inet_ntoa */ +#include /* tcp header and protocols */ /* IEEE 802.11 stuff -- will become one include later ... */ #include "ieee80211.h" /* from hunz's aeolus, short hostap_wlan.h */ @@ -136,7 +139,7 @@ void pcap_process(u_char *info,const struct pcap_pkthdr *pcap_header, struct beacon_struct *beacon_hdr; struct ethhdr *e_hdr; struct info_struct *my_info_struct; - int i,p_o,w_o,e_o,i_o; + int i,p_o,w_o,e_o,i_o,special_o=0; my_info_struct=(struct info_struct *)info; ++(my_info_struct->count); @@ -237,6 +240,7 @@ void pcap_process(u_char *info,const struct pcap_pkthdr *pcap_header, if((strncmp(my_info_struct->dev,"eth",3)==0)) { printf("ethernet: (%d bytes)\n",e_o); e_hdr=(struct ethhdr *)(package+p_o+w_o); + special_o=sizeof(struct ethhdr); /* what types ? */ printf("type = "); printf("%x ",ntohs(e_hdr->h_proto)); @@ -296,7 +300,7 @@ void pcap_process(u_char *info,const struct pcap_pkthdr *pcap_header, /* dump it */ #ifdef SHOW_HEX printf("all dump: (hex)\n"); - for(i=p_o+w_o;icaplen;i++) + for(i=p_o+w_o+special_o;icaplen;i++) printf("%x ",*(package+i)); printf("\n"); #endif @@ -335,10 +339,10 @@ int parse_ip(char *ip_o) { printf("ip protocol:\n"); ip_hdr=(struct iphdr *)ip_o; - printf("version = %x ",ntohs(ip_hdr->version)); - printf("header_length = %x \n",ntohs(ip_hdr->ihl)); - printf("service = %x ",ntohs(ip_hdr->tos)); - printf("total_length(dec.) = %d \n",ntohs(ip_hdr->tot_len)); + printf("version = %x ",ip_hdr->version); + printf("header_length = %x \n",ip_hdr->ihl); + printf("service = %x ",ip_hdr->tos); + printf("total_length(dec.) = %d \n",ip_hdr->tot_len); printf("source_ip: "); for(i=0;i<=3;++i) { printf("%d%s", @@ -352,8 +356,26 @@ int parse_ip(char *ip_o) { (i==3?"\n":".")); } printf("ip_id = %x ",ntohs(ip_hdr->id)); - printf("ip_offset = %x \n",ntohs(ip_hdr->frag_off)); - printf("time2live = %x ip_proto = %x\n",ntohs(ip_hdr->ttl), - ntohs(ip_hdr->protocol)); + printf("ip_offset = %x \n",ip_hdr->frag_off); + printf("time2live = %x ip_proto = %x\n",ip_hdr->ttl,ip_hdr->protocol); + /* how to continue */ + if(ip_hdr->protocol==IPPROTO_TCP) + parse_tcp(ip_hdr+sizeof(struct iphdr)); + if(ip_hdr->protocol==IPPROTO_UDP) + printf("udp package! get's parsed in the future\n"); // printf("chksum: %x\n",ntohs(ip_hdr->ip_sum)); } + +int parse_tcp(char *tcp_o) { + struct tcphdr *tcp_hdr; + + printf("tcp protocol:\n"); + tcp_hdr=(struct tcphdr *)tcp_o; + printf("source port: %d - dest port: %d\n",ntohs(tcp_hdr->source), + ntohs(tcp_hdr->dest)); + printf("sequence: %d - ack sequence: %d\n",ntohs(tcp_hdr->seq), + ntohs(tcp_hdr->ack_seq)); + printf("offset to data: %d - checksumm: %d\n",ntohs(tcp_hdr->doff) + ,ntohs(tcp_hdr->check)); + return 1; +} diff --git a/hdw-sniff.h b/hdw-sniff.h index 908b95b..83d4dbd 100644 --- a/hdw-sniff.h +++ b/hdw-sniff.h @@ -28,6 +28,7 @@ struct info_struct { /* hop_chanel function */ int hop_channel(struct info_struct *info,int foo_fd); int parse_ip(char *ip_o); +int parse_tcp(char *tcp_o); /* ssid struct */ struct ssid_struct {