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https://github.com/yarrick/iodine.git
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Reverted new protocol
This commit is contained in:
Erik Ekman
Erik Ekman
parent
7eb7c02e5f
commit
8a093efa59
15
src/common.h
15
src/common.h
@ -30,20 +30,7 @@
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#define QUERY_NAME_SIZE 256
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#define MAKE_HEADER(c,u) ((((c) & 0xf) << 4) | ((u) & 0xf))
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#define HEADER_GET_COMMAND(h) (((h) & 0xf0) >> 4)
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#define HEADER_GET_USERID(h) ((h) & 0x0f)
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enum header_command {
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CMD_VERSION = 0,
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CMD_LOGIN,
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CMD_CASE_CHECK,
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CMD_CODEC_SWITCH,
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CMD_DATA,
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CMD_PING
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};
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#define DATAHEADER_TOTLEN 3
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#define DATAHEADER_TOTLEN 2
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#define MAKE_DATAHEADER(last,compressed,fragno) \
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((((last) & 0x1) << 7) | (((compressed) & 0x1) << 6) | ((fragno) & 0x3f))
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124
src/iodine.c
124
src/iodine.c
@ -69,7 +69,10 @@ static char userid;
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/* DNS id for next packet */
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static uint16_t chunkid;
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/* The encoder used for packets
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/* Base32 encoder used for non-data packets */
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static struct encoder *b32;
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/* The encoder used for data packets
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* Defaults to Base32, can be changed after handshake */
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static struct encoder *dataenc;
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@ -102,11 +105,13 @@ send_query(int fd, char *hostname)
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}
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static void
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send_packet(int fd, const char *data, const size_t datalen)
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send_packet(int fd, char cmd, const char *data, const size_t datalen)
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{
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char buf[4096];
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/* Encode the data and add the topdomain */
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build_hostname(buf, sizeof(buf), data, datalen, topdomain, dataenc);
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buf[0] = cmd;
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build_hostname(buf + 1, sizeof(buf) - 1, data, datalen, topdomain, b32);
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send_query(fd, buf);
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}
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@ -115,6 +120,7 @@ build_hostname(char *buf, size_t buflen,
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const char *data, const size_t datalen,
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const char *topdomain, struct encoder *encoder)
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{
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int encsize;
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size_t space;
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char *b;
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@ -125,7 +131,7 @@ build_hostname(char *buf, size_t buflen,
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memset(buf, 0, buflen);
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encoder->encode(buf, &space, data, datalen);
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encsize = encoder->encode(buf, &space, data, datalen);
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if (!encoder->places_dots())
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inline_dotify(buf, buflen);
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@ -203,8 +209,6 @@ tunnel_tun(int tun_fd, int dns_fd)
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packet.sentlen = 0;
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packet.offset = 0;
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packet.len = outlen;
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packet.seqno++;
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packet.fragment = 0;
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send_chunk(dns_fd);
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@ -283,51 +287,26 @@ tunnel(int tun_fd, int dns_fd)
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static void
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send_chunk(int fd)
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{
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char buf[2048];
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char header[64];
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char headerenc[64];
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char hex[] = "0123456789ABCDEF";
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char buf[4096];
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int avail;
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int code;
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char *p;
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int rawblock;
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int headerblocks;
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int pkt_encoffset;
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int buf_encoffset;
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int sentlen;
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int i;
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size_t enclen;
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rawblock = dataenc->blocksize_raw();
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headerblocks = 1;
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while (headerblocks * rawblock < DATAHEADER_TOTLEN) {
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headerblocks++;
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}
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rawblock *= headerblocks;
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pkt_encoffset = rawblock - DATAHEADER_TOTLEN;
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buf_encoffset = dataenc->blocksize_encoded() * headerblocks;
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/* Encode all of the message except the first headerblocks block */
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p = packet.data;
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p += packet.offset;
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avail = packet.len - packet.offset + pkt_encoffset;
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sentlen = build_hostname(buf + buf_encoffset, sizeof(buf) - buf_encoffset,
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&p[pkt_encoffset], avail, topdomain, dataenc);
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avail = packet.len - packet.offset;
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packet.sentlen = sentlen + pkt_encoffset;
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packet.sentlen = build_hostname(buf + 1, sizeof(buf) - 1, p, avail, topdomain, dataenc);
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if (packet.sentlen == avail)
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code = 1;
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else
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code = 0;
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code |= (userid << 1);
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buf[0] = hex[code];
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/* Then encode the header and maybe some pkt data */
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header[0] = MAKE_HEADER(CMD_DATA, userid);
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header[1] = packet.seqno;
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header[2] = MAKE_DATAHEADER(avail == sentlen, 1, packet.fragment++);
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for (i = 0; i < pkt_encoffset; i++) {
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header[i + DATAHEADER_TOTLEN] = p[i];
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}
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/* Encode the first part, copy it into the buffer */
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dataenc->encode(headerenc, &enclen, header, DATAHEADER_TOTLEN + pkt_encoffset);
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for (i = 0; i < enclen; i++) {
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buf[i] = headerenc[i];
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}
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send_query(fd, buf);
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}
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@ -337,7 +316,7 @@ send_login(int fd, char *login, int len)
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char data[19];
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memset(data, 0, sizeof(data));
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data[0] = MAKE_HEADER(CMD_LOGIN, userid);
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data[0] = userid;
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memcpy(&data[1], login, MIN(len, 16));
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data[17] = (rand_seed >> 8) & 0xff;
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@ -345,7 +324,7 @@ send_login(int fd, char *login, int len)
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rand_seed++;
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send_packet(fd, data, sizeof(data));
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send_packet(fd, 'L', data, sizeof(data));
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}
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static void
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@ -359,32 +338,31 @@ send_ping(int fd)
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packet.len = 0;
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}
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data[0] = MAKE_HEADER(CMD_PING, userid);
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data[0] = userid;
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data[1] = (rand_seed >> 8) & 0xff;
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data[2] = (rand_seed >> 0) & 0xff;
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rand_seed++;
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send_packet(fd, data, sizeof(data));
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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_version(int fd, uint32_t version)
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{
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char data[7];
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char data[6];
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data[0] = MAKE_HEADER(CMD_VERSION, 0xf);
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data[1] = (version >> 24) & 0xff;
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data[2] = (version >> 16) & 0xff;
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data[3] = (version >> 8) & 0xff;
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data[4] = (version >> 0) & 0xff;
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data[0] = (version >> 24) & 0xff;
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data[1] = (version >> 16) & 0xff;
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data[2] = (version >> 8) & 0xff;
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data[3] = (version >> 0) & 0xff;
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data[5] = (rand_seed >> 8) & 0xff;
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data[6] = (rand_seed >> 0) & 0xff;
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data[4] = (rand_seed >> 8) & 0xff;
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data[5] = (rand_seed >> 0) & 0xff;
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rand_seed++;
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send_packet(fd, data, sizeof(data));
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send_packet(fd, 'V', data, sizeof(data));
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}
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static void
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@ -393,15 +371,7 @@ send_case_check(int fd)
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/* The '+' plus character is not allowed according to RFC.
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* Expect to get SERVFAIL or similar if it is rejected.
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*/
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char buf[512] = "__zZ+-aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyY1234.";
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char header = MAKE_HEADER(CMD_CASE_CHECK, userid);
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char enc[5];
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unsigned enclen;
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dataenc->encode(enc, &enclen, &header, 1);
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/* Encode header into start of message */
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buf[0] = enc[0];
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buf[1] = enc[1];
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char buf[512] = "zZ+-aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyY1234.";
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strncat(buf, topdomain, 512 - strlen(buf));
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send_query(fd, buf);
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@ -410,12 +380,16 @@ send_case_check(int fd)
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static void
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send_codec_switch(int fd, int userid, int bits)
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{
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char data[2];
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data[0] = MAKE_HEADER(CMD_VERSION, 0xf);
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data[1] = bits & 0xff;
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send_packet(fd, data, sizeof(data));
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char buf[512] = "S00.";
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if (userid >= 0 && userid < 9) {
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buf[1] += userid;
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}
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if (bits >= 0 && bits < 9) {
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buf[2] += bits;
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}
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strncat(buf, topdomain, 512 - strlen(buf));
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send_query(fd, buf);
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}
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static int
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@ -731,10 +705,8 @@ main(int argc, char **argv)
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device = NULL;
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chunkid = 0;
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b32 = get_base32_encoder();
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dataenc = get_base32_encoder();
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packet.seqno = 0;
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packet.fragment = 0;
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#if !defined(BSD) && !defined(__GLIBC__)
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__progname = strrchr(argv[0], '/');
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