mirror of
https://github.com/yarrick/iodine.git
synced 2024-06-26 17:29:20 +03:00
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
|
|
@ -498,22 +498,17 @@ send_codec_switch(int fd, int userid, int bits)
|
|||
strncat(buf, topdomain, 512 - strlen(buf));
|
||||
send_query(fd, buf);
|
||||
}
|
||||
|
||||
|
||||
static int
|
||||
handshake(int dns_fd)
|
||||
handshake_version(int dns_fd, int *seed)
|
||||
{
|
||||
struct timeval tv;
|
||||
uint32_t payload;
|
||||
char server[65];
|
||||
char client[65];
|
||||
char login[16];
|
||||
char in[4096];
|
||||
fd_set fds;
|
||||
int read;
|
||||
int mtu;
|
||||
int seed;
|
||||
uint32_t payload;
|
||||
int i;
|
||||
int r;
|
||||
int read;
|
||||
|
||||
for (i = 0; running && i < 5; i++) {
|
||||
tv.tv_sec = i + 1;
|
||||
|
|
@ -544,11 +539,11 @@ handshake(int dns_fd)
|
|||
((in[7] & 0xff)));
|
||||
|
||||
if (strncmp("VACK", in, 4) == 0) {
|
||||
seed = payload;
|
||||
*seed = payload;
|
||||
userid = in[8];
|
||||
|
||||
printf("Version ok, both using protocol v 0x%08x. You are user #%d\n", VERSION, userid);
|
||||
goto perform_login;
|
||||
return 0;
|
||||
} else if (strncmp("VNAK", in, 4) == 0) {
|
||||
warnx("You use protocol v 0x%08x, server uses v 0x%08x. Giving up",
|
||||
VERSION, payload);
|
||||
|
|
@ -563,10 +558,24 @@ handshake(int dns_fd)
|
|||
|
||||
printf("Retrying version check...\n");
|
||||
}
|
||||
errx(1, "couldn't connect to server");
|
||||
/* NOTREACHED */
|
||||
|
||||
perform_login:
|
||||
warnx("couldn't connect to server");
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int
|
||||
handshake_login(int dns_fd, int seed)
|
||||
{
|
||||
struct timeval tv;
|
||||
char in[4096];
|
||||
char login[16];
|
||||
char server[65];
|
||||
char client[65];
|
||||
int mtu;
|
||||
fd_set fds;
|
||||
int i;
|
||||
int r;
|
||||
int read;
|
||||
|
||||
login_calculate(login, 16, password, seed);
|
||||
|
||||
for (i=0; running && i<5 ;i++) {
|
||||
|
|
@ -600,7 +609,7 @@ perform_login:
|
|||
client[64] = 0;
|
||||
if (tun_setip(client, netmask) == 0 &&
|
||||
tun_setmtu(mtu) == 0) {
|
||||
goto perform_case_check;
|
||||
return 0;
|
||||
} else {
|
||||
warnx("Received handshake with bad data");
|
||||
}
|
||||
|
|
@ -614,8 +623,18 @@ perform_login:
|
|||
}
|
||||
warnx("couldn't login to server");
|
||||
return 1;
|
||||
}
|
||||
|
||||
static void
|
||||
handshake_case_check(int dns_fd)
|
||||
{
|
||||
struct timeval tv;
|
||||
char in[4096];
|
||||
fd_set fds;
|
||||
int i;
|
||||
int r;
|
||||
int read;
|
||||
|
||||
perform_case_check:
|
||||
case_preserved = 0;
|
||||
for (i=0; running && i<5 ;i++) {
|
||||
tv.tv_sec = i + 1;
|
||||
|
|
@ -635,7 +654,7 @@ perform_case_check:
|
|||
if (in[0] == 'z' || in[0] == 'Z') {
|
||||
if (read < (27 * 2)) {
|
||||
printf("Received short case check reply. Will use base32 encoder\n");
|
||||
goto switch_codec;
|
||||
return;
|
||||
} else {
|
||||
int k;
|
||||
|
||||
|
|
@ -647,14 +666,14 @@ perform_case_check:
|
|||
case_preserved = 0;
|
||||
}
|
||||
}
|
||||
goto switch_codec;
|
||||
return;
|
||||
}
|
||||
} else {
|
||||
printf("Received bad case check reply\n");
|
||||
}
|
||||
} else {
|
||||
printf("Got error on case check, will use base32\n");
|
||||
goto switch_codec;
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -662,9 +681,17 @@ perform_case_check:
|
|||
}
|
||||
|
||||
printf("No reply on case check, continuing\n");
|
||||
switch_codec:
|
||||
if (!case_preserved)
|
||||
goto autodetect_max_fragsize;
|
||||
}
|
||||
|
||||
static void
|
||||
handshake_switch_codec(int dns_fd)
|
||||
{
|
||||
struct timeval tv;
|
||||
char in[4096];
|
||||
fd_set fds;
|
||||
int i;
|
||||
int r;
|
||||
int read;
|
||||
|
||||
dataenc = get_base64_encoder();
|
||||
printf("Switching to %s codec\n", dataenc->name);
|
||||
|
|
@ -699,76 +726,99 @@ switch_codec:
|
|||
}
|
||||
in[read] = 0; /* zero terminate */
|
||||
printf("Server switched to codec %s\n", in);
|
||||
goto autodetect_max_fragsize;
|
||||
return;
|
||||
}
|
||||
}
|
||||
printf("Retrying codec switch...\n");
|
||||
}
|
||||
printf("No reply from server on codec switch. ");
|
||||
|
||||
codec_revert:
|
||||
printf("Falling back to base32\n");
|
||||
dataenc = get_base32_encoder();
|
||||
autodetect_max_fragsize:
|
||||
if (autodetect_frag_size) {
|
||||
int proposed_fragsize = 768;
|
||||
int range = 768;
|
||||
max_downstream_frag_size = 0;
|
||||
printf("Autoprobing max downstream fragment size... (skip with -m fragsize)\n");
|
||||
while (running && range > 0 && (range >= 8 || !max_downstream_frag_size)) {
|
||||
for (i=0; running && i<3 ;i++) {
|
||||
tv.tv_sec = 1;
|
||||
tv.tv_usec = 0;
|
||||
send_fragsize_probe(dns_fd, proposed_fragsize);
|
||||
}
|
||||
|
||||
FD_ZERO(&fds);
|
||||
FD_SET(dns_fd, &fds);
|
||||
static int
|
||||
handshake_autoprobe_fragsize(int dns_fd)
|
||||
{
|
||||
struct timeval tv;
|
||||
char in[4096];
|
||||
fd_set fds;
|
||||
int i;
|
||||
int r;
|
||||
int read;
|
||||
int proposed_fragsize = 768;
|
||||
int range = 768;
|
||||
|
||||
r = select(dns_fd + 1, &fds, NULL, NULL, &tv);
|
||||
max_downstream_frag_size = 0;
|
||||
printf("Autoprobing max downstream fragment size... (skip with -m fragsize)\n");
|
||||
while (running && range > 0 && (range >= 8 || !max_downstream_frag_size)) {
|
||||
for (i=0; running && i<3 ;i++) {
|
||||
tv.tv_sec = 1;
|
||||
tv.tv_usec = 0;
|
||||
send_fragsize_probe(dns_fd, proposed_fragsize);
|
||||
|
||||
if(r > 0) {
|
||||
read = read_dns(dns_fd, in, sizeof(in));
|
||||
|
||||
if (read > 0) {
|
||||
/* We got a reply */
|
||||
int acked_fragsize = ((in[0] & 0xff) << 8) | (in[1] & 0xff);
|
||||
if (acked_fragsize == proposed_fragsize) {
|
||||
if (read == proposed_fragsize) {
|
||||
printf("%d ok.. ", acked_fragsize);
|
||||
fflush(stdout);
|
||||
max_downstream_frag_size = acked_fragsize;
|
||||
range >>= 1;
|
||||
proposed_fragsize += range;
|
||||
continue;
|
||||
} else {
|
||||
goto badlen;
|
||||
}
|
||||
}
|
||||
if (strncmp("BADIP", in, 5) == 0) {
|
||||
printf("got BADIP.. ");
|
||||
FD_ZERO(&fds);
|
||||
FD_SET(dns_fd, &fds);
|
||||
|
||||
r = select(dns_fd + 1, &fds, NULL, NULL, &tv);
|
||||
|
||||
if(r > 0) {
|
||||
read = read_dns(dns_fd, in, sizeof(in));
|
||||
|
||||
if (read > 0) {
|
||||
/* We got a reply */
|
||||
int acked_fragsize = ((in[0] & 0xff) << 8) | (in[1] & 0xff);
|
||||
if (acked_fragsize == proposed_fragsize) {
|
||||
if (read == proposed_fragsize) {
|
||||
printf("%d ok.. ", acked_fragsize);
|
||||
fflush(stdout);
|
||||
max_downstream_frag_size = acked_fragsize;
|
||||
range >>= 1;
|
||||
proposed_fragsize += range;
|
||||
continue;
|
||||
} else {
|
||||
goto badlen;
|
||||
}
|
||||
}
|
||||
if (strncmp("BADIP", in, 5) == 0) {
|
||||
printf("got BADIP.. ");
|
||||
fflush(stdout);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
badlen:
|
||||
printf("%d not ok.. ", proposed_fragsize);
|
||||
fflush(stdout);
|
||||
range >>= 1;
|
||||
proposed_fragsize -= range;
|
||||
}
|
||||
if (!running) {
|
||||
printf("\n");
|
||||
warnx("stopped while autodetecting fragment size (Try probing manually with -m)");
|
||||
return 1;
|
||||
}
|
||||
if (range == 0) {
|
||||
/* Tried all the way down to 2 and found no good size */
|
||||
printf("\n");
|
||||
warnx("found no accepted fragment size. (Try probing manually with -m)");
|
||||
return 1;
|
||||
}
|
||||
printf("will use %d\n", max_downstream_frag_size);
|
||||
printf("%d not ok.. ", proposed_fragsize);
|
||||
fflush(stdout);
|
||||
range >>= 1;
|
||||
proposed_fragsize -= range;
|
||||
}
|
||||
if (!running) {
|
||||
printf("\n");
|
||||
warnx("stopped while autodetecting fragment size (Try probing manually with -m)");
|
||||
return 1;
|
||||
}
|
||||
if (range == 0) {
|
||||
/* Tried all the way down to 2 and found no good size */
|
||||
printf("\n");
|
||||
warnx("found no accepted fragment size. (Try probing manually with -m)");
|
||||
return 1;
|
||||
}
|
||||
printf("will use %d\n", max_downstream_frag_size);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void
|
||||
handshake_set_fragsize(int dns_fd)
|
||||
{
|
||||
struct timeval tv;
|
||||
char in[4096];
|
||||
fd_set fds;
|
||||
int i;
|
||||
int r;
|
||||
int read;
|
||||
|
||||
printf("Setting downstream fragment size to max %d...\n", max_downstream_frag_size);
|
||||
for (i=0; running && i<5 ;i++) {
|
||||
tv.tv_sec = i + 1;
|
||||
|
|
@ -789,20 +839,52 @@ badlen:
|
|||
|
||||
if (strncmp("BADFRAG", in, 7) == 0) {
|
||||
printf("Server rejected fragsize. Keeping default.");
|
||||
goto done;
|
||||
return;
|
||||
} else if (strncmp("BADIP", in, 5) == 0) {
|
||||
printf("Server rejected sender IP address.\n");
|
||||
goto done;
|
||||
return;
|
||||
}
|
||||
|
||||
accepted_fragsize = ((in[0] & 0xff) << 8) | (in[1] & 0xff);
|
||||
goto done;
|
||||
return;
|
||||
}
|
||||
}
|
||||
printf("Retrying set fragsize...\n");
|
||||
}
|
||||
printf("No reply from server when setting fragsize. Keeping default.\n");
|
||||
done:
|
||||
}
|
||||
|
||||
static int
|
||||
handshake(int dns_fd)
|
||||
{
|
||||
int seed;
|
||||
int r;
|
||||
|
||||
r = handshake_version(dns_fd, &seed);
|
||||
if (r) {
|
||||
return r;
|
||||
}
|
||||
|
||||
r = handshake_login(dns_fd, seed);
|
||||
if (r) {
|
||||
return r;
|
||||
}
|
||||
|
||||
handshake_case_check(dns_fd);
|
||||
|
||||
if (case_preserved) {
|
||||
handshake_switch_codec(dns_fd);
|
||||
}
|
||||
|
||||
if (autodetect_frag_size) {
|
||||
r = handshake_autoprobe_fragsize(dns_fd);
|
||||
if (r) {
|
||||
return r;
|
||||
}
|
||||
}
|
||||
|
||||
handshake_set_fragsize(dns_fd);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue