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Use packet functions for packet handling. Prepare for sending fragmented ( #7 )
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@ -122,6 +122,16 @@ send_version_response(int fd, version_ack_t ack, uint32_t payload, struct user *
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write_dns(fd, &u->q, out, sizeof(out));
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}
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static void
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send_chunk(int dns_fd, struct query *q, int userid)
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{
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/* XXX: check MTU and only send part of packet if needed */
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write_dns(dns_fd, q, users[userid].outpacket.data, users[userid].outpacket.len);
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/* move this reset to after receiving ack */
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users[userid].outpacket.len = 0;
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users[userid].q.id = 0;
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}
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static int
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tunnel_dns(int tun_fd, int dns_fd)
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{
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@ -257,8 +267,8 @@ tunnel_dns(int tun_fd, int dns_fd)
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if (code & 1) {
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outlen = sizeof(out);
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uncompress((uint8_t*)out, &outlen,
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(uint8_t*)users[userid].inpacket.data, users[userid].inpacket.len);
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uncompress((uint8_t*)out, &outlen, (uint8_t*)users[userid].inpacket.data,
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users[userid].inpacket.len);
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hdr = (struct ip*) (out + 4);
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touser = find_user_by_ip(hdr->ip_dst.s_addr);
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@ -269,23 +279,21 @@ tunnel_dns(int tun_fd, int dns_fd)
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} else {
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/* send the compressed packet to other client
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* if another packet is queued, throw away this one. TODO build queue */
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if (users[touser].outpacket.len == 0) {
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memcpy(users[touser].outpacket.data, users[userid].inpacket.data, users[userid].inpacket.len);
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users[touser].outpacket.len = users[userid].inpacket.len;
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if (packet_empty(&(users[touser].outpacket))) {
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packet_fill(&(users[touser].outpacket), users[userid].inpacket.data,
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users[userid].inpacket.len);
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}
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}
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users[userid].inpacket.len = users[userid].inpacket.offset = 0;
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packet_init(&(users[userid].inpacket)); /* clear inpacket */
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}
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}
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}
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/* userid must be set for a reply to be sent */
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if (userid >= 0 && userid < USERS && dummy.q.fromlen == users[userid].addrlen &&
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memcmp(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen) == 0 &&
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users[userid].outpacket.len > 0) {
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packet_empty(&(users[userid].outpacket)) == 0) {
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write_dns(dns_fd, &(dummy.q), users[userid].outpacket.data, users[userid].outpacket.len);
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users[userid].outpacket.len = 0;
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users[userid].q.id = 0;
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send_chunk(dns_fd, &(dummy.q), userid);
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}
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return 0;
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@ -326,9 +334,7 @@ tunnel(int tun_fd, int dns_fd)
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if (i==0) {
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for (j = 0; j < USERS; j++) {
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if (users[j].q.id != 0) {
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write_dns(dns_fd, &(users[j].q), users[j].outpacket.data, users[j].outpacket.len);
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users[j].outpacket.len = 0;
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users[j].q.id = 0;
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send_chunk(dns_fd, &(users[j].q), j);
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}
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}
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} else {
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