Split handshake() function into smaller functions
This commit is contained in:
Erik Ekman
parent
f741e3d551
commit
7de1455c96
240
src/iodine.c
240
src/iodine.c
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@ -498,22 +498,17 @@ send_codec_switch(int fd, int userid, int bits)
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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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handshake(int dns_fd)
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handshake_version(int dns_fd, int *seed)
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{
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struct timeval tv;
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uint32_t payload;
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char server[65];
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char client[65];
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char login[16];
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char in[4096];
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fd_set fds;
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int read;
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int mtu;
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int seed;
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uint32_t payload;
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int i;
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int r;
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int read;
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for (i = 0; running && i < 5; i++) {
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tv.tv_sec = i + 1;
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@ -544,11 +539,11 @@ handshake(int dns_fd)
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((in[7] & 0xff)));
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if (strncmp("VACK", in, 4) == 0) {
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seed = payload;
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*seed = payload;
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userid = in[8];
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printf("Version ok, both using protocol v 0x%08x. You are user #%d\n", VERSION, userid);
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goto perform_login;
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return 0;
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} else if (strncmp("VNAK", in, 4) == 0) {
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warnx("You use protocol v 0x%08x, server uses v 0x%08x. Giving up",
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VERSION, payload);
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@ -563,10 +558,24 @@ handshake(int dns_fd)
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printf("Retrying version check...\n");
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}
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errx(1, "couldn't connect to server");
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/* NOTREACHED */
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perform_login:
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warnx("couldn't connect to server");
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return 1;
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}
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static int
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handshake_login(int dns_fd, int seed)
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{
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struct timeval tv;
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char in[4096];
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char login[16];
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char server[65];
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char client[65];
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int mtu;
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fd_set fds;
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int i;
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int r;
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int read;
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login_calculate(login, 16, password, seed);
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for (i=0; running && i<5 ;i++) {
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@ -600,7 +609,7 @@ perform_login:
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client[64] = 0;
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if (tun_setip(client, netmask) == 0 &&
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tun_setmtu(mtu) == 0) {
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goto perform_case_check;
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return 0;
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} else {
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warnx("Received handshake with bad data");
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}
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@ -614,8 +623,18 @@ perform_login:
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}
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warnx("couldn't login to server");
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return 1;
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}
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static void
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handshake_case_check(int dns_fd)
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{
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struct timeval tv;
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char in[4096];
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fd_set fds;
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int i;
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int r;
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int read;
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perform_case_check:
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case_preserved = 0;
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for (i=0; running && i<5 ;i++) {
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tv.tv_sec = i + 1;
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@ -635,7 +654,7 @@ perform_case_check:
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if (in[0] == 'z' || in[0] == 'Z') {
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if (read < (27 * 2)) {
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printf("Received short case check reply. Will use base32 encoder\n");
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goto switch_codec;
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return;
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} else {
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int k;
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@ -647,14 +666,14 @@ perform_case_check:
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case_preserved = 0;
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}
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}
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goto switch_codec;
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return;
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}
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} else {
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printf("Received bad case check reply\n");
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}
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} else {
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printf("Got error on case check, will use base32\n");
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goto switch_codec;
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return;
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}
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}
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@ -662,9 +681,17 @@ perform_case_check:
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}
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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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goto autodetect_max_fragsize;
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}
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static void
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handshake_switch_codec(int dns_fd)
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{
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struct timeval tv;
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char in[4096];
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fd_set fds;
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int i;
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int r;
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int read;
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dataenc = get_base64_encoder();
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printf("Switching to %s codec\n", dataenc->name);
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@ -699,76 +726,99 @@ 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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goto autodetect_max_fragsize;
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return;
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}
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}
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printf("Retrying codec switch...\n");
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}
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printf("No reply from server on codec switch. ");
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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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int proposed_fragsize = 768;
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int range = 768;
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max_downstream_frag_size = 0;
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printf("Autoprobing max downstream fragment size... (skip with -m fragsize)\n");
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while (running && range > 0 && (range >= 8 || !max_downstream_frag_size)) {
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for (i=0; running && i<3 ;i++) {
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tv.tv_sec = 1;
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tv.tv_usec = 0;
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send_fragsize_probe(dns_fd, proposed_fragsize);
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}
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FD_ZERO(&fds);
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FD_SET(dns_fd, &fds);
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static int
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handshake_autoprobe_fragsize(int dns_fd)
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{
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struct timeval tv;
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char in[4096];
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fd_set fds;
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int i;
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int r;
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int read;
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int proposed_fragsize = 768;
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int range = 768;
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r = select(dns_fd + 1, &fds, NULL, NULL, &tv);
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max_downstream_frag_size = 0;
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printf("Autoprobing max downstream fragment size... (skip with -m fragsize)\n");
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while (running && range > 0 && (range >= 8 || !max_downstream_frag_size)) {
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for (i=0; running && i<3 ;i++) {
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tv.tv_sec = 1;
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tv.tv_usec = 0;
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send_fragsize_probe(dns_fd, proposed_fragsize);
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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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/* We got a reply */
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int acked_fragsize = ((in[0] & 0xff) << 8) | (in[1] & 0xff);
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if (acked_fragsize == proposed_fragsize) {
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if (read == proposed_fragsize) {
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printf("%d ok.. ", acked_fragsize);
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fflush(stdout);
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max_downstream_frag_size = acked_fragsize;
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range >>= 1;
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proposed_fragsize += range;
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continue;
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} else {
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goto badlen;
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}
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}
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if (strncmp("BADIP", in, 5) == 0) {
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printf("got BADIP.. ");
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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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/* We got a reply */
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int acked_fragsize = ((in[0] & 0xff) << 8) | (in[1] & 0xff);
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if (acked_fragsize == proposed_fragsize) {
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if (read == proposed_fragsize) {
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printf("%d ok.. ", acked_fragsize);
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fflush(stdout);
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max_downstream_frag_size = acked_fragsize;
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range >>= 1;
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proposed_fragsize += range;
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continue;
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} else {
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goto badlen;
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}
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}
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if (strncmp("BADIP", in, 5) == 0) {
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printf("got BADIP.. ");
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fflush(stdout);
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}
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}
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}
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}
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badlen:
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printf("%d not ok.. ", proposed_fragsize);
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fflush(stdout);
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range >>= 1;
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proposed_fragsize -= range;
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}
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if (!running) {
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printf("\n");
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warnx("stopped while autodetecting fragment size (Try probing manually with -m)");
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return 1;
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}
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if (range == 0) {
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/* Tried all the way down to 2 and found no good size */
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printf("\n");
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warnx("found no accepted fragment size. (Try probing manually with -m)");
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return 1;
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}
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printf("will use %d\n", max_downstream_frag_size);
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printf("%d not ok.. ", proposed_fragsize);
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fflush(stdout);
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range >>= 1;
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proposed_fragsize -= range;
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}
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if (!running) {
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printf("\n");
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warnx("stopped while autodetecting fragment size (Try probing manually with -m)");
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return 1;
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}
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if (range == 0) {
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/* Tried all the way down to 2 and found no good size */
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printf("\n");
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warnx("found no accepted fragment size. (Try probing manually with -m)");
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return 1;
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}
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printf("will use %d\n", max_downstream_frag_size);
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return 0;
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}
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static void
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handshake_set_fragsize(int dns_fd)
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{
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struct timeval tv;
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char in[4096];
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fd_set fds;
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int i;
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int r;
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int read;
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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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@ -789,20 +839,52 @@ badlen:
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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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return;
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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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return;
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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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return;
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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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}
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static int
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handshake(int dns_fd)
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{
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int seed;
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int r;
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r = handshake_version(dns_fd, &seed);
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if (r) {
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return r;
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}
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r = handshake_login(dns_fd, seed);
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if (r) {
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return r;
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}
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handshake_case_check(dns_fd);
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if (case_preserved) {
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handshake_switch_codec(dns_fd);
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}
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if (autodetect_frag_size) {
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r = handshake_autoprobe_fragsize(dns_fd);
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if (r) {
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return r;
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}
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}
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handshake_set_fragsize(dns_fd);
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return 0;
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}
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