Problen with a little C program

Tyler T espartano.list at gmail.com
Fri Sep 23 02:06:05 PDT 2005


2005/9/23, Tyler T <espartano.list at gmail.com>:
> hi list, firts sorry for my english.
>
> for hobbye i am trying to write a little program in C lenguage, the
> program create a ip header and show the values of ip header whitout
> send any data, only create the header, the program is this:
>
> //////BEGIN////////
> #include <stdio.h>
> #include <stdlib.h>
> #include <unistd.h>
> #include <netinet/in.h>
> #include <sys/types.h>
> #include <sys/socket.h>
> #include <netinet/ip.h>
> #include <netinet/tcp.h>
> #include <sys/time.h>
> #include <arpa/inet.h>
>
> #include <netdb.h>
>
> struct ip *create_iph(char *ips, char *ipd, int sec);
> void show_iph(struct ip *iph);
>
> int main(){
>
>    struct ip *iph;
>
>    iph = create_iph("127.0.0.1","127.0.0.1",10);
>    showiph(iph);
>
>    free(iph);
>
>    iph=NULL;
>
>    return 0;
>
> }
>
> struct ip *create_iph(char *ips, char *ipd, int sec){
>
>         struct ip *iph;
>
>         iph = malloc(sizeof(struct ip));
>
>         iph->ip_v = 4;
>         iph->ip_hl = 5;
>         iph->ip_tos = 0;
>         iph->ip_len = sizeof(struct ip) + sizeof(struct tcphdr);
>         iph->ip_id = htons(sec); //cambiar el id por el numero de port a scanear
>         iph->ip_ttl = 255;
>         iph->ip_p = 6;
>         iph->ip_sum = 0;  //checksum
>         iph->ip_src.s_addr = inet_addr(ips);
>         iph->ip_dst.s_addr = inet_addr(ipd);
>
>         return iph;
> }
>
> void show_iph(struct ip *iph){
>
>         printf("version %d\n",iph->ip_v);
>         printf("header leng (ihl) %d\n",iph->ip_hl);
>         printf("total leng %d\n",iph->ip_len);
>         printf("identification %d\n",iph->ip_id);
>         printf("TTL %d\n",iph->ip_ttl);
>         printf("protocol %d\n",iph->ip_p);
>         printf("checksum %d\n",iph->ip_sum);
>         printf("type of service (TOS) %d\n",iph->ip_tos);
>         printf("ip source %s\n",inet_ntoa(iph->ip_src));
>         printf("ip destination %s\n",inet_ntoa(iph->ip_dst));
>
> }
> ////////END///////
>
> when i execute:  "gcc -o sock_raw sock_raw.c"  i obtain:
>
> -bash-2.05b$ gcc -o sock_raw sock_raw.c
> In file included from sock_raw.c:7:
> /usr/include/netinet/ip.h:160: error: syntax error before "n_long"
> /usr/include/netinet/ip.h:163: error: syntax error before "n_long"
> -bash-2.05b$
>
>
> my system is: FreeBSD 5.4 STABLE
> and my gcc version is: gcc version 3.4.2 [FreeBSD] 20040728
>
> thanks in advance.
>

sorry, i have the solution:  It was necessary to include the library
<netinet/in_systm.h>

thanks for all.


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