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added debug output to help track down the recvmsg() control message IDs

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on linux (seem to be different than on BSD).
This commit is contained in:
gardners 2012-02-05 17:53:51 +10:30
parent eee99a7893
commit 9d3ab08f1e
1 changed files with 7 additions and 3 deletions
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10
server.c
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@ -69,15 +69,19 @@ int recvwithttl(int sock,unsigned char *buffer,int bufferlen,int *ttl,
cmsg != NULL;
cmsg = CMSG_NXTHDR(&msg,cmsg)) {
if ((cmsg->cmsg_level == IPPROTO_IP) && (cmsg->cmsg_type == IP_RECVTTL) &&
(cmsg->cmsg_len) ){
if ((cmsg->cmsg_level == IPPROTO_IP) &&
((cmsg->cmsg_type == IP_RECVTTL) ||(cmsg->cmsg_type == IP_TTL))
&&(cmsg->cmsg_len) ){
fprintf(stderr," TTL (%p) data location resolves to %p\n",
ttl,CMSG_DATA(cmsg));
if (CMSG_DATA(cmsg)) {
*ttl = *(unsigned char *) CMSG_DATA(cmsg);
fprintf(stderr," TTL of packet is %d\n",*ttl);
}
}
} else {
fprintf(stderr,"I didn't expect to see level=%02x, type=%02x\n",
cmsg->cmsg_level,cmsg->cmsg_type);
}
}
}
*recvaddrlen=msg.msg_namelen;