error: dereferencing pointer to incomplete type and ICMP undeclared

Himalay

2012-04-27 06:43:30 UTC

I am using CYGWIN gcc compiler on Windows XP Prof. OS. I am getting following
errors. I have defined __USE_BSD in ip_icmp.h.
Anyone please help me in solving errors.

recv_v4.c: In function `recv_v4':
recv_v4.c:38: error: dereferencing pointer to incomplete type
recv_v4.c:38: error: `ICMP_TIMXCEED' undeclared (first use in this function)
recv_v4.c:38: error: (Each undeclared identifier is reported only once
recv_v4.c:38: error: for each function it appears in.)
recv_v4.c:39: error: dereferencing pointer to incomplete type
recv_v4.c:39: error: `ICMP_TIMXCEED_INTRANS' undeclared (first use in this
function)
recv_v4.c:51: error: dereferencing pointer to incomplete type
recv_v4.c:51: error: `ICMP_UNREACH' undeclared (first use in this function)
recv_v4.c:61: error: dereferencing pointer to incomplete type
recv_v4.c:61: error: `ICMP_UNREACH_PORT' undeclared (first use in this function)
recv_v4.c:64: error: dereferencing pointer to incomplete type
recv_v4.c:69: error: dereferencing pointer to incomplete type
recv_v4.c:69: error: dereferencing pointer to incomplete type

Following is the code:

trace.h:
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <netdb.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/udp.h>
#include <unistd.h>
#include <stdio.h>

#ifdef HAVE_SOCKADDR_DL_STRUCT
#include <net/if_dl.h>
#endif

#define BUFSIZE 1500

struct rec { /* format of outgoing UDP data
*/
u_short rec_seq; /* sequence number */
u_short rec_ttl; /* TTL packet left with */
struct timeval rec_tv; /* time packet left */
};

/* globals */
char recvbuf[BUFSIZE];
char sendbuf[BUFSIZE];

int datalen; /* # bytes of data following
ICMP header */
char *host;
u_short sport, dport;
int nsent; /* add 1 for each sendto() */
pid_t pid; /* our PID */
int probe, nprobes;
int sendfd, recvfd; /* send on UDP sock, read on raw ICMP
sock */
int ttl, max_ttl;
int verbose;

/* function prototypes */
const char *icmpcode_v4(int);
const char *icmpcode_v6(int);
int recv_v4(int, struct timeval *);
int recv_v6(int, struct timeval *);
void sig_alrm(int);
void traceloop(void);
void tv_sub(struct timeval *, struct timeval *);

struct proto {
const char *(*icmpcode)(int);
int (*recv)(int, struct timeval *);
struct sockaddr *sasend; /* sockaddr{} for send, from getaddrinfo */
struct sockaddr *sarecv; /* sockaddr{} for receiving */
struct sockaddr *salast; /* last sockaddr{} for receiving */
struct sockaddr *sabind; /* sockaddr{} for binding source port */
socklen_t salen; /* length of sockaddr{}s */
int icmpproto; /* IPPROTO_xxx value for ICMP */
int ttllevel; /* setsockopt() level to set TTL */
int ttloptname; /* setsockopt() name to set TTL */
} *pr;

#ifdef IPV6

#include <netinet/ip6.h>
#include <netinet/icmp6.h>

#endif

recv_v4.c:
#include "trace.h"

/*
* Return: -3 on timeout
* -2 on ICMP time exceeded in transit (caller keeps going)
* -1 on ICMP port unreachable (caller is done)
* >= 0 return value is some other ICMP unreachable code
*/

int recv_v4(int seq, struct timeval *tv)
{
int hlen1, hlen2, icmplen;
socklen_t len;
ssize_t n;
struct ip *ip, *hip;
struct icmp *icmp;
struct udphdr *udp;

alarm(3);
for ( ; ; ) {
len = pr->salen;
n = recvfrom(recvfd, recvbuf, sizeof(recvbuf), 0, pr->sarecv,
&len);
if (n < 0) {
if (errno == EINTR)
return(-3); /* alarm expired */
else
err_sys("recvfrom error");
}
gettimeofday(tv, NULL); /* get time of packet arrival */

ip = (struct ip *) recvbuf; /* start of IP header */
hlen1 = ip->ip_hl << 2; /* length of IP header */

icmp = (struct icmp *) (recvbuf + hlen1); /* start of ICMP
header */
if ( (icmplen = n - hlen1) < 8)
err_quit("icmplen (%d) < 8", icmplen);

if (icmp->icmp_type == ICMP_TIMXCEED &&
icmp->icmp_code == ICMP_TIMXCEED_INTRANS) {
if (icmplen < 8 + 20 + 8)
err_quit("icmplen (%d) < 8 + 20 + 8", icmplen);

hip = (struct ip *) (recvbuf + hlen1 + 8);
hlen2 = hip->ip_hl << 2;
udp = (struct udphdr *) (recvbuf + hlen1 + 8 + hlen2);
if (hip->ip_p == IPPROTO_UDP &&
udp->uh_sport == htons(sport) &&
udp->uh_dport == htons(dport + seq))
return(-2); /* we hit an
intermediate router */

} else if (icmp->icmp_type == ICMP_UNREACH) {
if (icmplen < 8 + 20 + 8)
err_quit("icmplen (%d) < 8 + 20 + 8", icmplen);

hip = (struct ip *) (recvbuf + hlen1 + 8);
hlen2 = hip->ip_hl << 2;
udp = (struct udphdr *) (recvbuf + hlen1 + 8 + hlen2);
if (hip->ip_p == IPPROTO_UDP &&
udp->uh_sport == htons(sport) &&
udp->uh_dport == htons(dport + seq)) {
if (icmp->icmp_code == ICMP_UNREACH_PORT)
return(-1); /* have reached
destination */
else
return(icmp->icmp_code); /* 0,
1, 2, ... */
}
} else if (verbose) {
printf(" (from %s: type = %d, code = %d)\n",
Sock_ntop_host(pr->sarecv, pr->salen),
icmp->icmp_type, icmp->icmp_code);
}
/* Some other ICMP error, recvfrom() again */
}
}

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