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https://github.com/yarrick/iodine.git
synced 2024-11-22 06:41:26 +00:00
#7, set max fragsize with -m in the client
This commit is contained in:
parent
d4e077aff4
commit
9ababcaa96
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@ -46,6 +46,18 @@ Server sends:
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be encoded with the new codec.
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BADCODEC if not accepted. Client must then revert to Base32
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Set downstream fragment size:
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Client sends:
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First byte n or N
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Rest encoded with base32:
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1 byte userid
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2 bytes new downstream fragment size
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CMC
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Server sends:
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2 bytes new downstream fragment size. After this all downstream
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payloads will be max (fragsize + 2) bytes long.
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BADFRAG if not accepted.
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Data:
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Upstream data header:
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3210 432 10 43 210 4321 0
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87
src/iodine.c
87
src/iodine.c
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@ -64,7 +64,10 @@ static int downstream_fragment;
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static int down_ack_seqno;
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static int down_ack_fragment;
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/* Current IP packet */
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static int max_downstream_frag_size;
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static int autodetect_frag_size;
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/* Current up/downstream IP packet */
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static struct packet outpkt;
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static struct packet inpkt;
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@ -406,6 +409,22 @@ send_ping(int fd)
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send_packet(fd, 'P', data, sizeof(data));
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}
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static void
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send_set_downstream_fragsize(int fd, int fragsize)
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{
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char data[5];
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data[0] = userid;
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data[1] = (fragsize & 0xff00) >> 8;
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data[2] = (fragsize & 0x00ff);
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data[3] = (rand_seed >> 8) & 0xff;
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data[4] = (rand_seed >> 0) & 0xff;
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rand_seed++;
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send_packet(fd, 'N', data, sizeof(data));
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}
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static void
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send_version(int fd, uint32_t version)
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{
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@ -612,7 +631,7 @@ perform_case_check:
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printf("No reply on case check, continuing\n");
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switch_codec:
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if (!case_preserved)
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return 0;
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goto set_downstream_fragment_size;
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dataenc = get_base64_encoder();
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printf("Switching to %s codec\n", dataenc->name);
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@ -647,7 +666,7 @@ switch_codec:
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}
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in[read] = 0; /* zero terminate */
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printf("Server switched to codec %s\n", in);
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return 0;
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goto autodetect_max_fragsize;
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}
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}
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printf("Retrying codec switch...\n");
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@ -656,9 +675,49 @@ switch_codec:
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codec_revert:
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printf("Falling back to base32\n");
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dataenc = get_base32_encoder();
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autodetect_max_fragsize:
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if (autodetect_frag_size) {
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printf("Autoprobing max downstream fragment size...\n");
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/* TODO */
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}
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set_downstream_fragment_size:
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printf("Setting downstream fragment size to max %d...\n", max_downstream_frag_size);
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for (i=0; running && i<5 ;i++) {
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tv.tv_sec = i + 1;
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tv.tv_usec = 0;
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send_set_downstream_fragsize(dns_fd, max_downstream_frag_size);
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FD_ZERO(&fds);
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FD_SET(dns_fd, &fds);
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r = select(dns_fd + 1, &fds, NULL, NULL, &tv);
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if(r > 0) {
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read = read_dns(dns_fd, in, sizeof(in));
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if (read > 0) {
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int accepted_fragsize;
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if (strncmp("BADFRAG", in, 7) == 0) {
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printf("Server rejected fragsize. Keeping default.");
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goto done;
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} else if (strncmp("BADIP", in, 5) == 0) {
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printf("Server rejected sender IP address.\n");
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goto done;
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}
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accepted_fragsize = ((in[0] & 0xff) << 8) | (in[1] & 0xff);
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goto done;
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}
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}
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printf("Retrying set fragsize...\n");
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}
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printf("No reply from server when setting fragsize. Keeping default.\n");
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done:
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return 0;
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}
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static char *
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get_resolvconf_addr()
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{
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@ -705,7 +764,7 @@ usage() {
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extern char *__progname;
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printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-d device] "
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"[nameserver] topdomain\n", __progname);
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"[-P password] [-m maxfragsize] [nameserver] topdomain\n", __progname);
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exit(2);
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}
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@ -715,7 +774,7 @@ help() {
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printf("iodine IP over DNS tunneling client\n");
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printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-d device] "
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"[-P password] [nameserver] topdomain\n", __progname);
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"[-P password] [-m maxfragsize] [nameserver] topdomain\n", __progname);
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printf(" -v to print version info and exit\n");
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printf(" -h to print this help and exit\n");
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printf(" -f to keep running in foreground\n");
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@ -723,6 +782,7 @@ help() {
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printf(" -t dir to chroot to directory dir\n");
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printf(" -d device to set tunnel device name\n");
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printf(" -P password used for authentication (max 32 chars will be used)\n");
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printf(" -m maxfragsize, to limit size of downstream packets\n");
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printf("nameserver is the IP number of the relaying nameserver, if absent /etc/resolv.conf is used\n");
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printf("topdomain is the FQDN that is delegated to the tunnel endpoint.\n");
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@ -764,6 +824,9 @@ main(int argc, char **argv)
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outpkt.seqno = 0;
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inpkt.len = 0;
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autodetect_frag_size = 1;
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max_downstream_frag_size = 3072;
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b32 = get_base32_encoder();
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dataenc = get_base32_encoder();
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@ -775,7 +838,7 @@ main(int argc, char **argv)
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__progname++;
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#endif
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while ((choice = getopt(argc, argv, "vfhu:t:d:P:")) != -1) {
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while ((choice = getopt(argc, argv, "vfhu:t:d:P:m:")) != -1) {
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switch(choice) {
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case 'v':
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version();
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@ -804,6 +867,10 @@ main(int argc, char **argv)
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/* XXX: find better way of cleaning up ps(1) */
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memset(optarg, 0, strlen(optarg));
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break;
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case 'm':
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autodetect_frag_size = 0;
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max_downstream_frag_size = atoi(optarg);
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break;
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default:
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usage();
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/* NOTREACHED */
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@ -833,6 +900,12 @@ main(int argc, char **argv)
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/* NOTREACHED */
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}
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if (max_downstream_frag_size < 1 || max_downstream_frag_size > 0xffff) {
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warnx("Use a max frag size between 1 and 65535 bytes.\n");
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usage();
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/* NOTREACHED */
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}
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set_nameserver(nameserv_addr);
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if(strlen(topdomain) <= 128) {
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@ -377,6 +377,25 @@ handle_null_request(int tun_fd, int dns_fd, struct query *q, int domain_len)
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break;
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}
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return;
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} else if(in[0] == 'N' || in[0] == 'n') {
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int max_frag_size;
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read = unpack_data(unpacked, sizeof(unpacked), &(in[1]), domain_len - 1, b32);
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/* Downstream fragsize packet */
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userid = unpacked[0];
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if (userid < 0 || userid >= USERS || ip_cmp(userid, q) != 0) {
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write_dns(dns_fd, q, "BADIP", 5);
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return; /* illegal id */
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}
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max_frag_size = ((unpacked[1] & 0xff) << 8) | (unpacked[2] & 0xff);
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if (max_frag_size < 1) {
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write_dns(dns_fd, q, "BADFRAG", 7);
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} else {
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users[userid].fragsize = max_frag_size;
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write_dns(dns_fd, q, &unpacked[1], 2);
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}
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return;
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} else if(in[0] == 'P' || in[0] == 'p') {
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int dn_seq;
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int dn_frag;
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