mirror of
https://github.com/yarrick/iodine.git
synced 2024-11-28 20:45:12 +00:00
Modified options packet to change more than 1 option at a time
This commit is contained in:
frekky
parent
4f16dd10e6
commit
e454a7edb5
@ -111,12 +111,14 @@ Options:
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Client sends:
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First byte o or O
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5 bits coded as Base32 char, meaning userid
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1 char, meaning option
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number of options (n) as decimal digit
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n chars, each a valid option (to be processed in order)
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CMC as 3 Base32 chars
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Server sends:
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Full name of option if accepted. After this, option immediately takes
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effect in server.
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Option chars in the same order as request, indicating that options were
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accepted by the server.
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BADCODEC if not accepted. Previous situation remains.
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BADLEN if number of options doesn't match length of query.
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All options affect only the requesting client.
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Option chars:
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229
src/client.c
229
src/client.c
@ -474,7 +474,7 @@ send_query(int fd, uint8_t *hostname)
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" always work any more. Start with -L0 next time on this network.");
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lazymode = 0;
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server_timeout_ms = 0;
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handshake_lazyoff(fd);
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handshake_switch_options(fd, 0, compression_down, downenc);
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}
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}
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}
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@ -1455,51 +1455,21 @@ send_codec_switch(int fd, int userid, int bits)
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}
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static void
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send_compression_switch(int fd, int userid)
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send_server_options(int fd, int userid, int lazy, int compression, char denc, char *options)
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/* Options must be length >=4 */
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{
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char buf[512] = "o_____.";
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buf[1] = b32_5to8(userid);
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buf[2] = compression_down ? 'c' : 'd';
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buf[3] = b32_5to8((rand_seed >> 10) & 0x1f);
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buf[4] = b32_5to8((rand_seed >> 5) & 0x1f);
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buf[5] = b32_5to8((rand_seed) & 0x1f);
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rand_seed++;
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strncat(buf, topdomain, 512 - strlen(buf));
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send_query(fd, (uint8_t *)buf);
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}
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static void
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send_downenc_switch(int fd, int userid)
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{
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char buf[512] = "o_____.";
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buf[1] = b32_5to8(userid);
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buf[2] = tolower(downenc);
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buf[3] = b32_5to8((rand_seed >> 10) & 0x1f);
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buf[4] = b32_5to8((rand_seed >> 5) & 0x1f);
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buf[5] = b32_5to8((rand_seed) & 0x1f);
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rand_seed++;
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strncat(buf, topdomain, 512 - strlen(buf));
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send_query(fd, (uint8_t *)buf);
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}
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static void
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send_lazy_switch(int fd, int userid)
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{
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char buf[512] = "o_____.";
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char buf[512] = "oU3___CMC.";
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buf[1] = b32_5to8(userid);
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if (lazymode)
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buf[2] = 'l';
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else
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buf[2] = 'i';
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options[0] = tolower(denc);
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options[1] = lazy ? 'l' : 'i';
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options[2] = compression ? 'c' : 'd';
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options[3] = 0;
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strncpy(buf + 3, options, 3);
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buf[3] = b32_5to8((rand_seed >> 10) & 0x1f);
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buf[4] = b32_5to8((rand_seed >> 5) & 0x1f);
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buf[5] = b32_5to8((rand_seed ) & 0x1f);
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buf[6] = b32_5to8((rand_seed >> 10) & 0x1f);
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buf[7] = b32_5to8((rand_seed >> 5) & 0x1f);
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buf[8] = b32_5to8((rand_seed) & 0x1f);
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rand_seed++;
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strncat(buf, topdomain, 512 - strlen(buf));
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@ -2185,87 +2155,54 @@ codec_revert:
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fprintf(stderr, "Falling back to upstream codec %s\n", dataenc->name);
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}
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static void
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handshake_switch_downcompression(int dns_fd)
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void
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handshake_switch_options(int dns_fd, int lazy, int compression, char denc)
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{
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char in[4096];
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int i;
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int read;
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char *status;
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char *dname, *comp_status, *lazy_status;
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char opts[4];
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status = compression_down ? "on" : "off";
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fprintf(stderr, "Switching %s downstream data compression\n", status);
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for (i = 0; running && i < 5; i++) {
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send_compression_switch(dns_fd, userid);
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read = handshake_waitdns(dns_fd, in, sizeof(in), 'O', i+1);
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if (read > 0) {
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if (strncmp("BADLEN", in, 6) == 0) {
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fprintf(stderr, "Server got bad message length.\n");
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goto fail;
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} else if (strncmp("BADIP", in, 5) == 0) {
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fprintf(stderr, "Server rejected sender IP address.\n");
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goto fail;
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} else if (strncmp("BADCODEC", in, 8) == 0) {
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fprintf(stderr, "Server rejected the compression option.\n");
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goto fail;
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}
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in[read] = 0; /* zero terminate */
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fprintf(stderr, "Server %s downstream compression\n", in);
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return;
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}
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fprintf(stderr, "Retrying downstream compression switch...\n");
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}
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if (!running)
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return;
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fprintf(stderr, "No reply from server on downstream compression switch.\n");
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fail:
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fprintf(stderr, "Failed to switch %s downstream data compression\n", status);
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}
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static void
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handshake_switch_downenc(int dns_fd)
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{
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char in[4096];
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int i;
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int read;
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char *dname;
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comp_status = compression ? "enabled" : "disabled";
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dname = "Base32";
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if (downenc == 'S')
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if (denc == 'S')
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dname = "Base64";
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else if (downenc == 'U')
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else if (denc == 'U')
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dname = "Base64u";
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else if (downenc == 'V')
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else if (denc == 'V')
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dname = "Base128";
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else if (downenc == 'R')
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else if (denc == 'R')
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dname = "Raw";
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fprintf(stderr, "Switching downstream to codec %s\n", dname);
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for (i=0; running && i<5 ;i++) {
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lazy_status = lazy ? "lazy" : "immediate";
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send_downenc_switch(dns_fd, userid);
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fprintf(stderr, "Switching server options: %s mode, downstream codec %s, compression %s...\n",
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lazy_status, dname, comp_status);
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for (int i = 0; running && i < 5; i++) {
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read = handshake_waitdns(dns_fd, in, sizeof(in), 'O', i+1);
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send_server_options(dns_fd, userid, lazy, compression, denc, opts);
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read = handshake_waitdns(dns_fd, in, sizeof(in) - 1, 'O', i + 1);
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if (read > 0) {
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if (strncmp("BADLEN", in, 6) == 0) {
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fprintf(stderr, "Server got bad message length.\n");
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goto codec_revert;
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goto opt_revert;
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} else if (strncmp("BADIP", in, 5) == 0) {
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fprintf(stderr, "Server rejected sender IP address.\n");
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goto codec_revert;
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goto opt_revert;
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} else if (strncmp("BADCODEC", in, 8) == 0) {
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fprintf(stderr, "Server rejected the selected codec.\n");
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goto codec_revert;
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fprintf(stderr, "Server rejected the selected options.\n");
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goto opt_revert;
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} else if (strncasecmp(opts, in + 3, 3) != 0) {
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fprintf(stderr, "Server failed to change options.\n");
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goto opt_revert;
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}
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in[read] = 0; /* zero terminate */
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fprintf(stderr, "Server switched downstream to codec %s\n", in);
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fprintf(stderr, "Switched server options successfully. (%s)\n", opts);
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lazymode = lazy;
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compression_down = compression;
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downenc = denc;
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return;
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}
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@ -2276,79 +2213,9 @@ handshake_switch_downenc(int dns_fd)
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fprintf(stderr, "No reply from server on codec switch.\n");
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codec_revert:
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fprintf(stderr, "Falling back to downstream codec Base32\n");
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}
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static void
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handshake_try_lazy(int dns_fd)
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{
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char in[4096];
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int i;
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int read;
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fprintf(stderr, "Switching to lazy mode for low-latency\n");
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for (i=0; running && i<5; i++) {
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send_lazy_switch(dns_fd, userid);
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read = handshake_waitdns(dns_fd, in, sizeof(in), 'O', i+1);
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if (read > 0) {
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if (strncmp("BADLEN", in, 6) == 0) {
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fprintf(stderr, "Server got bad message length.\n");
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goto codec_revert;
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} else if (strncmp("BADIP", in, 5) == 0) {
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fprintf(stderr, "Server rejected sender IP address.\n");
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goto codec_revert;
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} else if (strncmp("BADCODEC", in, 8) == 0) {
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fprintf(stderr, "Server rejected lazy mode.\n");
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goto codec_revert;
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} else if (strncmp("Lazy", in, 4) == 0) {
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fprintf(stderr, "Server switched to lazy mode\n");
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lazymode = 1;
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return;
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}
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}
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fprintf(stderr, "Retrying lazy mode switch...\n");
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}
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if (!running)
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return;
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fprintf(stderr, "No reply from server on lazy switch.\n");
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codec_revert:
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fprintf(stderr, "Falling back to legacy mode\n");
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lazymode = 0;
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max_timeout_ms = 1000;
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}
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void
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handshake_lazyoff(int dns_fd)
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/* Used in the middle of data transfer, timing is different and no error msgs */
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{
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char in[4096];
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int i;
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int read;
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for (i=0; running && i<5; i++) {
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send_lazy_switch(dns_fd, userid);
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read = handshake_waitdns(dns_fd, in, sizeof(in), 'O', 1);
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if (read == 9 && strncmp("Immediate", in, 9) == 0) {
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warnx("Server switched back to legacy mode.");
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lazymode = 0;
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max_timeout_ms = 1000;
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return;
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}
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}
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if (!running)
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return;
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warnx("No reply from server on legacy mode switch.");
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opt_revert:
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fprintf(stderr, "Falling back to previous configuration, downstream codec %s.\n",
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dataenc->name);
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}
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static int
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@ -2600,16 +2467,8 @@ client_handshake(int dns_fd, int raw_mode, int autodetect_frag_size, int fragsiz
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if (!running)
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return -1;
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handshake_switch_downenc(dns_fd);
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if (!running)
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return -1;
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if (!compression_down)
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handshake_switch_downcompression(dns_fd);
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if (lazymode) {
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handshake_try_lazy(dns_fd);
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}
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/* Set options for compression, lazymode and downstream codec */
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handshake_switch_options(dns_fd, lazymode, compression_down, downenc);
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if (!running)
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return -1;
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@ -49,7 +49,7 @@ void client_set_hostname_maxlen(size_t i);
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int client_handshake(int dns_fd, int raw_mode, int autodetect_frag_size, int fragsize);
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int client_tunnel(int tun_fd, int dns_fd);
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void handshake_lazyoff(int dns_fd);
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void handshake_switch_options(int dns_fd, int lazy, int compression, char denc);
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void send_ping(int fd, int ping_response, int ack);
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#endif
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68
src/server.c
68
src/server.c
@ -1388,7 +1388,12 @@ handle_null_request(int tun_fd, int dns_fd, struct dnsfd *dns_fds, struct query
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}
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return;
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} else if(in[0] == 'O' || in[0] == 'o') { /* Protocol options */
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if (domain_len < 3) { /* len at least 3, example: "O1T" */
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int bits = 0;
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int numopts;
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char num[2], *opts;
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int tmp_lazy, tmp_downenc, tmp_comp;
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if (domain_len < 7) { /* len at least 7, example: "oa1tcmc" */
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write_dns(dns_fd, q, "BADLEN", 6, 'T');
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return;
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}
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@ -1400,59 +1405,67 @@ handle_null_request(int tun_fd, int dns_fd, struct dnsfd *dns_fds, struct query
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return; /* illegal id */
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}
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int bits = 0;
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switch (toupper(in[2])) {
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num[0] = in[2];
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num[1] = 0;
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numopts = atoi(num);
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if (domain_len != numopts + 6 || numopts == 0) {
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write_dns(dns_fd, q, "BADLEN", 6, 'T');
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}
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/* Temporary variables: don't change anything until all options parsed */
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tmp_lazy = users[userid].lazy;
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tmp_comp = users[userid].down_compression;
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tmp_downenc = users[userid].downenc;
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opts = (char *) in + 3;
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for (int i = 0; i < numopts; i++) {
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switch (toupper(opts[i])) {
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case 'T':
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users[userid].downenc = 'T';
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write_dns(dns_fd, q, "Base32", 6, users[userid].downenc);
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tmp_downenc = 'T';
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bits = 5;
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break;
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case 'S':
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users[userid].downenc = 'S';
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write_dns(dns_fd, q, "Base64", 6, users[userid].downenc);
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tmp_downenc = 'S';
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bits = 6;
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break;
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case 'U':
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users[userid].downenc = 'U';
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write_dns(dns_fd, q, "Base64u", 7, users[userid].downenc);
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tmp_downenc = 'U';
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bits = 6;
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break;
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case 'V':
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users[userid].downenc = 'V';
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write_dns(dns_fd, q, "Base128", 7, users[userid].downenc);
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tmp_downenc = 'V';
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bits = 7;
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break;
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case 'R':
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users[userid].downenc = 'R';
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write_dns(dns_fd, q, "Raw", 3, users[userid].downenc);
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tmp_downenc = 'R';
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bits = 8;
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break;
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case 'L':
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users[userid].lazy = 1;
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write_dns(dns_fd, q, "Lazy", 4, users[userid].downenc);
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tmp_lazy = 1;
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break;
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case 'I':
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users[userid].lazy = 0;
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write_dns(dns_fd, q, "Immediate", 9, users[userid].downenc);
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tmp_lazy = 0;
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break;
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case 'C':
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users[userid].down_compression = 1;
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write_dns(dns_fd, q, "Enabled", 7, users[userid].downenc);
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tmp_comp = 1;
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break;
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case 'D':
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users[userid].down_compression = 0;
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write_dns(dns_fd, q, "Disabled", 8, users[userid].downenc);
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tmp_comp = 0;
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break;
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default:
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write_dns(dns_fd, q, "BADCODEC", 8, users[userid].downenc);
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break;
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return;
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}
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}
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/* Automatically switch to raw encoding if PRIVATE or NULL request */
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if (q->type == T_NULL || q->type == T_PRIVATE) {
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if ((q->type == T_NULL || q->type == T_PRIVATE) && !bits) {
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users[userid].downenc = 'R';
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bits = 8;
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if (debug >= 3)
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warnx("Assuming raw data encoding due to NULL/PRIVATE requests for user %d.", userid);
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warnx("Assuming raw data encoding with NULL/PRIVATE requests for user %d.", userid);
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}
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if (bits) {
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int f = users[userid].fragsize;
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@ -1462,6 +1475,13 @@ handle_null_request(int tun_fd, int dns_fd, struct dnsfd *dns_fds, struct query
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users[userid].outgoing->maxfraglen, userid, bits, users[userid].downenc);
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users[userid].downenc_bits = bits;
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}
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/* Store any changes */
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users[userid].down_compression = tmp_comp;
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users[userid].downenc = tmp_downenc;
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users[userid].lazy = tmp_lazy;
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write_dns(dns_fd, q, opts, numopts, users[userid].downenc);
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return;
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} else if(in[0] == 'Y' || in[0] == 'y') { /* Downstream codec check */
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int i;
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