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converted iodine.c to use packet struct

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This commit is contained in:
Erik Ekman 2007-07-11 22:39:56 +00:00 committed by Erik Ekman
parent 60e00a629a
commit e8b2310fae
2 changed files with 30 additions and 32 deletions
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7
src/common.h
View File

@ -30,9 +30,10 @@
struct packet struct packet
{ {
int len; int len; /* Total packet length */
int offset; int sentlen; /* Length of chunk currently transmitted */
char data[64*1024]; int offset; /* Current offset */
char data[64*1024]; /* The data */
}; };
struct query { struct query {

53
src/iodine.c
View File

@ -58,11 +58,8 @@ static char *topdomain;
uint16_t rand_seed; uint16_t rand_seed;
/* Current IP packet */ /* Current IP packet */
static char activepacket[4096]; static struct packet packet;
static char userid; static char userid;
static int lastlen;
static int packetpos;
static int packetlen;
static uint16_t chunkid; static uint16_t chunkid;
/* Base32 encoder used for non-data packets */ /* Base32 encoder used for non-data packets */
@ -131,36 +128,36 @@ build_hostname(char *buf, size_t buflen,
int int
is_sending() is_sending()
{ {
return (packetlen != 0); return (packet.len != 0);
} }
int int
read_dns(int fd, char *buf, int buflen) read_dns(int fd, char *buf, int buflen)
{ {
struct sockaddr_in from; struct sockaddr_in from;
char packet[64*1024]; char data[64*1024];
socklen_t addrlen; socklen_t addrlen;
struct query q; struct query q;
int rv; int rv;
int r; int r;
addrlen = sizeof(struct sockaddr); addrlen = sizeof(struct sockaddr);
if ((r = recvfrom(fd, packet, sizeof(packet), 0, if ((r = recvfrom(fd, data, sizeof(data), 0,
(struct sockaddr*)&from, &addrlen)) == -1) { (struct sockaddr*)&from, &addrlen)) == -1) {
warn("recvfrom"); warn("recvfrom");
return 0; return 0;
} }
rv = dns_decode(buf, buflen, &q, QR_ANSWER, packet, r); rv = dns_decode(buf, buflen, &q, QR_ANSWER, data, r);
if (is_sending() && chunkid == q.id) { if (is_sending() && chunkid == q.id) {
/* Got ACK on sent packet */ /* Got ACK on sent packet */
packetpos += lastlen; packet.offset += packet.sentlen;
if (packetpos == packetlen) { if (packet.offset == packet.len) {
/* Packet completed */ /* Packet completed */
packetpos = 0; packet.offset = 0;
packetlen = 0; packet.len = 0;
lastlen = 0; packet.sentlen = 0;
} else { } else {
/* More to send */ /* More to send */
send_chunk(fd); send_chunk(fd);
@ -186,10 +183,10 @@ tunnel_tun(int tun_fd, int dns_fd)
inlen = read; inlen = read;
compress2((uint8_t*)out, &outlen, (uint8_t*)in, inlen, 9); compress2((uint8_t*)out, &outlen, (uint8_t*)in, inlen, 9);
memcpy(activepacket, out, MIN(outlen, sizeof(activepacket))); memcpy(packet.data, out, MIN(outlen, sizeof(packet.data)));
lastlen = 0; packet.sentlen = 0;
packetpos = 0; packet.offset = 0;
packetlen = outlen; packet.len = outlen;
send_chunk(dns_fd); send_chunk(dns_fd);
@ -268,7 +265,7 @@ static void
send_chunk(int fd) send_chunk(int fd)
{ {
char hex[] = "0123456789ABCDEF"; char hex[] = "0123456789ABCDEF";
char packet[4096]; char data[4096];
struct query q; struct query q;
char buf[4096]; char buf[4096];
int avail; int avail;
@ -279,22 +276,22 @@ send_chunk(int fd)
q.id = ++chunkid; q.id = ++chunkid;
q.type = T_NULL; q.type = T_NULL;
p = activepacket; p = packet.data;
p += packetpos; p += packet.offset;
avail = packetlen - packetpos; avail = packet.len - packet.offset;
lastlen = build_hostname(buf + 1, sizeof(buf) - 1, p, avail, topdomain, dataenc); packet.sentlen = build_hostname(buf + 1, sizeof(buf) - 1, p, avail, topdomain, dataenc);
if (lastlen == avail) if (packet.sentlen == avail)
code = 1; code = 1;
else else
code = 0; code = 0;
code |= (userid << 1); code |= (userid << 1);
buf[0] = hex[code]; buf[0] = hex[code];
len = dns_encode(packet, sizeof(packet), &q, QR_QUERY, buf, strlen(buf)); len = dns_encode(data, sizeof(data), &q, QR_QUERY, buf, strlen(buf));
sendto(fd, packet, len, 0, (struct sockaddr*)&peer, sizeof(peer)); sendto(fd, data, len, 0, (struct sockaddr*)&peer, sizeof(peer));
} }
void void
@ -320,9 +317,9 @@ send_ping(int fd)
char data[3]; char data[3];
if (is_sending()) { if (is_sending()) {
lastlen = 0; packet.sentlen = 0;
packetpos = 0; packet.offset = 0;
packetlen = 0; packet.len = 0;
} }
data[0] = userid; data[0] = userid;