Hi Sean,

I just observed that I am able to capture ICMP reply packets only but not ICMP request packets though qnx does reply to 
the ICMP request.

Is this expected behaviour (should not be right, in linux I could capture the request too with the same code.)?

Below is the program:

#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<errno.h>
#include<stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <netdb.h>

typedef struct _icmphdr {
		unsigned char type;
		unsigned char code;
		unsigned short chksum;
		unsigned char data[0];
}icmphdr;

typedef struct _echohdr {
	unsigned short iden;
	unsigned short seqno;
}echohdr;

int main(int argc, char *argv[])
{
        int s, len;
        struct sockaddr_in saddr, daddr;
        unsigned char dbuf[200];
        char *buf=NULL;
        socklen_t addrlen;
        int offset;
        if ((s=socket(PF_INET, SOCK_RAW, IPPROTO_ICMP))<0) {
                printf("Socket creation error! %s\n", strerror(errno));
                return 1;
        }
        while (1) {
        		memset(&daddr, 0, sizeof(daddr));
        		memset(dbuf, 0, 100);
        		addrlen = sizeof(daddr);
                if ((len=recvfrom(s, dbuf, 200, 0, (struct sockaddr *)&saddr, &addrlen))<0)
                {
                	printf("Receive Error: %s\n", strerror(errno));
                	continue;
                }
                printf("Packet received from %s, bytes = %d\n ", inet_ntoa(saddr.sin_addr), len);
                offset = dbuf[0] & 0x0f;
                buf = dbuf + offset*4;
                printf("ICMP [TYPE]=%01x [CODE]=%01x\n",((icmphdr *)buf)->type, ((icmphdr *)buf)->code);
                if (((icmphdr *)buf)->code ==0) {
                	icmphdr *hdr = (icmphdr *)buf;
                	if (hdr->type == 0) {
                		printf("Echo reply\n");
                	} else if (hdr->type ==8) {
                		printf("Echo request\n");
                	} else {
                		printf("Illegal echo packet\n");
                	}
                	printf("Echo [IDEN]=%02x [SEQ NO]=%02x\n",((echohdr *)hdr->data)->iden, ((echohdr *)hdr->data)->seqno);

                }
                printf("=========END=======\n");
        } 
        return 0;
}

> ooops... sleepy eyes made me type DGRAM... and IPPROTO_ICMP is defined as 1 
> anyway...
> Thanks for the utils/p/ping tip.. will try...


How can I get the source code of such utility?
Can you give me the link?