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srlog2.c
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srlog2.c
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#include <sys/types.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <bglibs/sysdeps.h>
#include <bglibs/systime.h>
#include <bglibs/crc32.h>
#include <bglibs/iobuf.h>
#include <bglibs/msg.h>
#include <bglibs/wrap.h>
#include <bglibs/resolve.h>
#include <bglibs/socket.h>
#include <bglibs/str.h>
#include <bglibs/sig.h>
#include "conf_etc.c"
#include "srlog2.h"
#include "srlog2-cli.h"
#define REJECTf(FORMAT, ...) do { \
debugf(DEBUG_PACKET, FORMAT, __VA_ARGS__); \
return 0; \
} while (0)
#define REJECT1(STRING) do { \
debug1(DEBUG_PACKET, STRING); \
return 0; \
} while (0)
static const char* keydir = conf_etc;
static const char* sender;
static const char* service;
static ipv4addr ip;
static ipv4port port;
static int sock;
static unsigned long ack_timeout = 1000;
static unsigned long cid_timeout = 5*1000;
static unsigned long retransmits = 4;
static unsigned long readwait = 100;
static unsigned long startlines = 250;
static const char** patterns;
static str keyex_name;
static const struct key_cb* keyex;
static str tmpstr;
static unsigned char nonce[8];
static int exitoneof = 0;
static int exitasap;
static str packet;
static str rpacket;
static const struct buffer_ops* buffer = 0;
/* Key/Encryption Handling ------------------------------------------------- */
static struct keylist shared_secrets;
static struct keylist server_publics;
static struct keylist client_secrets;
static AUTH_CTX ini_authenticator;
static AUTH_CTX msg_authenticator;
static AUTH_CTX cid_authenticator;
static ENCR_CTX encryptor;
/* ------------------------------------------------------------------------- */
static int stdin_eof = 0;
static struct line last_line;
static void gettimestamp(struct timestamp* ts)
{
static struct timeval tv;
gettimeofday(&tv, 0);
ts->sec = tv.tv_sec;
ts->nsec = tv.tv_usec * 1000 + 500;
}
static int read_line(void)
{
const char** p;
int matches;
if (!ibuf_getstr(&inbuf, &last_line.line, LF)) {
exitasap = exitoneof || seq_next == seq_send;
if (!ibuf_eof(&inbuf))
error1sys("Could not read line from stdin");
stdin_eof = 1;
return 0;
}
--last_line.line.len; /* Strip off the trailing LF */
if (patterns != 0) {
matches = 1;
for (p = patterns; *p != 0; ++p) {
if (str_matchs(&last_line.line, (*p)+1))
matches = **p == '+';
}
if (!matches) return 0;
}
gettimestamp(&last_line.timestamp);
SET_SEQ(last_line.seq = seq_next++);
if (last_line.line.len > MAX_LINE) {
str_rcut(&last_line.line, last_line.line.len - MAX_LINE);
memcpy(last_line.line.s + MAX_LINE - 17, "[...truncated...]", 17);
}
buffer->push(&last_line);
return 1;
}
static int read_lines(void)
{
int count = 0;
do {
count += read_line();
} while (inbuf.io.buflen > inbuf.io.bufstart);
return count;
}
/* Polling ----------------------------------------------------------------- */
static int poll_timeout;
static struct timeval poll_timestamp;
static iopoll_fd io[2];
#define stdin_ready (io[0].revents)
#define stdin_error (stdin_ready && (io[0].revents & IOPOLL_READ) == 0)
#define sock_ready (io[1].revents)
static void poll_reset(int timeout)
{
poll_timeout = timeout;
poll_timestamp.tv_sec = 0;
}
static int poll_both(void)
{
struct timeval timestamp;
int ready;
/* Sanity check to make sure no data is lost */
if (inbuf.io.buflen > inbuf.io.bufstart) {
stdin_ready = IOPOLL_READ;
sock_ready = 0;
return 1;
}
/* Calculate remaining timeout */
gettimeofday(×tamp, 0);
if (poll_timestamp.tv_sec != 0) {
poll_timeout -= (timestamp.tv_sec - poll_timestamp.tv_sec) * 1000 +
(timestamp.tv_usec - poll_timestamp.tv_usec) / 1000;
if (poll_timeout < 0) poll_timeout = 0;
}
poll_timestamp = timestamp;
io[0].fd = stdin_eof ? -1 : 0;
io[0].events = stdin_eof ? 0 : IOPOLL_READ;
io[1].fd = sock;
io[1].events = IOPOLL_READ;
switch (ready = iopoll(io, 2, poll_timeout)) {
case -1:
if (errno == EAGAIN || errno == EINTR)
exitasap = 1;
else
die1sys(1, "Poll failed!");
return 0;
case 0:
poll_timeout = 0;
return 0;
default:
if (stdin_error) {
stdin_eof = 1;
if (exitoneof || seq_next == seq_send)
exitasap = 1;
io[0].revents = 0;
}
return ready;
}
}
/* Packet generation ------------------------------------------------------- */
static uint64 seq_last;
static uint64 seq_first;
static int saw_seq_gap = 0;
static int add_msg(const struct line* l)
{
if ((unsigned char)packet.s[8+8] == 0xff
|| packet.len + 8 + 2 + l->line.len + 4 + AUTH_LENGTH >= MAX_PACKET)
return 0;
if (seq_last > 0 && l->seq != seq_last + 1) {
saw_seq_gap = 1;
return 0;
}
debugf(DEBUG_MSG, "{Adding line #}llu", l->seq);
++packet.s[8+8];
pkt_add_ts(&packet, &l->timestamp);
pkt_add_s2(&packet, &l->line);
seq_last = l->seq;
return 1;
}
static void start_msg(const struct line* l)
{
seq_first = l->seq;
pkt_start(&packet, MSG1);
pkt_add_u8(&packet, l->seq);
pkt_add_u1(&packet, 0);
add_msg(l);
}
static void end_msg(void)
{
unsigned char pad[ENCR_BLOCK_SIZE - (packet.len - 17 + 4) % ENCR_BLOCK_SIZE];
brandom_fill(pad, sizeof pad);
pkt_add_b(&packet, pad, sizeof pad);
pkt_add_u4(&packet, crc32_block(packet.s+17, packet.len-17));
encr_blocks(&encryptor,
(unsigned char*)packet.s+17, packet.len-17, seq_first);
pkt_add_cc(&packet, &msg_authenticator);
}
static int make_msg(void)
{
const struct line* line;
if ((line = buffer->read()) == 0)
return 0;
start_msg(line);
while ((line = buffer->peek()) != 0) {
if (!add_msg(line))
break;
buffer->read();
}
end_msg();
return 1;
}
static void make_prq(void)
{
brandom_fill(nonce, sizeof nonce);
pkt_start(&packet, PRQ1);
pkt_add_b(&packet, nonce, sizeof nonce);
pkt_add_s1c(&packet, AUTHENTICATOR_NAME);
wrap_str(str_copys(&keyex_name, nistp224_cb.name));
if (keylist_get(&shared_secrets, &curve25519_cb) != 0) {
wrap_str(str_catc(&keyex_name, 0));
wrap_str(str_cats(&keyex_name, curve25519_cb.name));
}
pkt_add_s1(&packet, &keyex_name);
pkt_add_s1c(&packet, KEYHASH_NAME);
pkt_add_s1c(&packet, ENCRYPTOR_NAME);
pkt_add_s1c(&packet, "null");
}
static void make_ini(const struct key* key, const struct line* line)
{
const struct timestamp* ts;
struct timestamp now;
pkt_start(&packet, INI1);
pkt_add_u8(&packet, seq_send);
if (line == 0) {
gettimestamp(&now);
ts = &now;
}
else
ts = &line->timestamp;
pkt_add_ts(&packet, ts);
pkt_add_s1c(&packet, sender);
pkt_add_s1c(&packet, service);
pkt_add_s1c(&packet, AUTHENTICATOR_NAME);
pkt_add_s1c(&packet, keyex->name);
pkt_add_s1c(&packet, KEYHASH_NAME);
pkt_add_s1c(&packet, ENCRYPTOR_NAME);
pkt_add_s1c(&packet, "null");
pkt_add_key(&packet, key);
pkt_add_cc(&packet, &ini_authenticator);
}
/* Network I/O ------------------------------------------------------------- */
static void send_packet(const char* type, int timeout)
{
if (!socket_send4(sock, packet.s, packet.len, &ip, port)) {
errorfsys("{Could not send }s{ packet to server}", type);
exitasap = 1;
}
else {
debugf(DEBUG_PACKET, "{Sent }s{ packet}", type);
poll_reset(timeout);
}
}
static int receive_packet(uint32 type, int minlength, int maxlength)
{
int i;
uint32 t;
if ((i = socket_recv4(sock, rpacket.s, rpacket.size, &ip,&port)) < 0)
REJECT1("Socket receive failed");
if (i < minlength)
REJECT1("Received packet is too short");
if (maxlength > 0
&& i > maxlength)
REJECT1("Received packet is too long");
rpacket.len = i;
pkt_get_u4(&rpacket, 0, &t);
if (t != SRL2)
REJECT1("Received packet format was not SRL2");
pkt_get_u4(&rpacket, 4, &t);
if (t != type)
REJECT1("Received incorrect packet type");
return 1;
}
static int receive_prf(void)
{
unsigned offset;
struct key* key;
if (!receive_packet(PRF1, 8+8+2+2+2+2+2, 8+8+256+256+256+256+256))
return 0;
if ((offset = pkt_get_b(&rpacket, 8, &tmpstr, sizeof nonce)) == 0
|| memcmp(tmpstr.s, nonce, sizeof nonce) != 0
|| (offset = pkt_get_s1(&rpacket, offset, &tmpstr)) == 0
|| strcasecmp(tmpstr.s, AUTHENTICATOR_NAME) != 0
|| (offset = pkt_get_s1(&rpacket, offset, &keyex_name)) == 0
|| (keyex = key_cb_lookup(keyex_name.s)) == 0
|| (offset = pkt_get_s1(&rpacket, offset, &tmpstr)) == 0
|| strcasecmp(tmpstr.s, KEYHASH_NAME) != 0
|| (offset = pkt_get_s1(&rpacket, offset, &tmpstr)) == 0
|| strcasecmp(tmpstr.s, ENCRYPTOR_NAME) != 0
|| (offset = pkt_get_s1(&rpacket, offset, &tmpstr)) == 0
|| strcasecmp(tmpstr.s, "null") != 0
|| offset != rpacket.len)
REJECT1("Received PRF1 had invalid format or parameters");
if ((keyex = key_cb_lookup(keyex_name.s)) == 0)
REJECTf("{PRF response contained bad keyex name: }s", keyex_name.s);
if ((key = keylist_get(&shared_secrets, keyex)) == 0)
REJECTf("{PRF response referenced missing shared secret: }s", keyex_name.s);
debug1(DEBUG_PACKET, "Received PRF packet");
auth_start(&ini_authenticator, key);
return 1;
}
static int receive_ack(void)
{
uint64 seq;
if (!receive_packet(ACK1, 8+8+AUTH_LENGTH, 8+8+AUTH_LENGTH))
return 0;
pkt_get_u8(&rpacket, 8, &seq);
if (seq != seq_last) {
debugf(DEBUG_PACKET, "{Received wrong ACK sequence #}llu{ sent #}llu",
seq, seq_last);
return 0;
}
if (!pkt_validate(&rpacket, &msg_authenticator)) {
debug1(DEBUG_PACKET, "Received ACK failed validation");
return 0;
}
debugf(DEBUG_PACKET, "{Received ACK packet #}llu", seq);
buffer->pop();
seq_last = 0;
return 1;
}
static int receive_cid(struct key* csession_secret)
{
struct key ssession_public;
struct key tmpkey;
if (!receive_packet(CID1,
8 + keyex->size + AUTH_LENGTH,
8 + keyex->size + AUTH_LENGTH))
return 0;
if (!pkt_validate(&rpacket, &cid_authenticator)) {
debug1(DEBUG_PACKET, "Received CID failed validation");
return 0;
}
pkt_get_key(&rpacket, 8, &ssession_public, keyex);
key_exchange(&tmpkey, &ssession_public, csession_secret);
auth_start(&msg_authenticator, &tmpkey);
encr_init(&encryptor, &tmpkey);
debug1(DEBUG_PACKET, "Received CID packet");
seq_last = 0;
return 1;
}
/* States ------------------------------------------------------------------ */
#define STATE_DISCONNECTED 0
#define STATE_NEGOTIATED 1
#define STATE_SENDING 2
#define STATE_CONNECTED 3
#define STATE_EXITING 4
const char* const state_name[] = {
"disconnected",
"negotiated",
"sending",
"connected",
"exiting",
};
static int do_negotiating(void)
{
unsigned backoff = 1;
make_prq();
while (!exitasap) {
send_packet("PRQ1", cid_timeout * backoff);
while (!exitasap) {
if (poll_both() == 0)
break;
if (stdin_ready)
read_lines();
if (sock_ready) {
if (receive_prf())
return STATE_NEGOTIATED;
backoff = 0;
}
}
if (backoff < retransmits)
++backoff;
}
return STATE_EXITING;
}
static int do_connecting(void)
{
struct key csession_secret;
struct key csession_public;
struct key tmpkey;
unsigned backoff = 1;
saw_seq_gap = 0;
buffer->rewind();
key_generate(&csession_secret, &csession_public, keyex);
make_ini(&csession_public, buffer->peek());
keylist_exchange_list_key(&tmpkey, &server_publics, &csession_secret);
auth_start(&cid_authenticator, &tmpkey);
while (!exitasap) {
send_packet("INI1", cid_timeout * backoff);
while (!exitasap) {
if (poll_both() == 0)
return STATE_DISCONNECTED;
if (stdin_ready)
read_lines();
if (sock_ready) {
if (receive_cid(&csession_secret))
return STATE_SENDING;
backoff = 0;
}
}
if (backoff < retransmits)
++backoff;
}
return STATE_EXITING;
}
static int do_sending(void)
{
unsigned i;
if (!make_msg())
return stdin_eof ? STATE_EXITING : STATE_CONNECTED;
/* Try to send the message packet multiple times. */
for (i = 1; !exitasap && i <= retransmits; ++i) {
debugf(DEBUG_PACKET, "{Sending seq #}llu{ to #}llu", seq_send, seq_last);
send_packet("MSG1", ack_timeout * i);
while (!exitasap) {
if (poll_both() == 0) {
debug1(DEBUG_STATE, "Timed out waiting for ACK");
break;
}
if (stdin_ready)
read_lines();
if (sock_ready && receive_ack())
return saw_seq_gap ? STATE_DISCONNECTED : STATE_SENDING;
}
}
return STATE_DISCONNECTED;
}
static int do_connected(void)
{
while (!exitasap) {
if (read_lines())
break;
}
/* Keep capturing lines as long as there are lines ready to read. */
while (!exitasap) {
if (seq_next - seq_send >= startlines)
return STATE_SENDING;
switch (iopoll(io, 1, readwait)) {
case -1:
return STATE_EXITING;
case 1:
if (stdin_error)
return exitoneof ? STATE_EXITING : STATE_SENDING;
if (read_lines() > 0 || stdin_eof)
return STATE_SENDING;
continue;
case 0:
return STATE_SENDING;
}
}
return STATE_EXITING;
}
/* State Machine ----------------------------------------------------------- */
static void mainloop(void)
{
int state = STATE_DISCONNECTED;
while (!exitasap) {
debugf(DEBUG_STATE, "{Entering state }s", state_name[state]);
switch (state) {
case STATE_DISCONNECTED: state = do_negotiating(); break;
case STATE_NEGOTIATED: state = do_connecting(); break;
case STATE_SENDING: state = do_sending(); break;
case STATE_CONNECTED: state = do_connected(); break;
case STATE_EXITING: exitasap = 1; break;
default: die1(1, "Illegal state");
}
}
}
/* Main Loop --------------------------------------------------------------- */
static void sigfn(int s) {
warnf("{Killed with signal }u", s);
exitasap = 1;
}
static void load_patterns(char** argv)
{
patterns = (const char**)argv;
while (*argv) {
if (*argv[0] != '-' && *argv[0] != '+')
usage(1, "Invalid pattern");
++argv;
}
}
static void load_keys(const char* server)
{
str path = {0,0,0};
wrap_str(str_copy4s(&path, keydir, "/servers/", server, "."));
if (!keylist_load_multi(&server_publics, path.s, 0) &&
!keylist_load_multi(&server_publics, "server.", 0))
die1sys(1, "Could not load server keys");
if (!keylist_load_multi(&client_secrets, "", 0)) {
wrap_str(str_copy2s(&path, keydir, "/"));
if (!keylist_load_multi(&client_secrets, path.s, 0))
die1sys(1, "Could not load sender keys");
}
if (!keylist_exchange_all(&shared_secrets, &server_publics, &client_secrets))
die1(1, "No server keys matched any sender keys");
str_free(&path);
}
static void getenvu(const char* name, unsigned long* dst)
{
const char* env;
char* end;
if ((env = getenv(name)) != 0)
if ((*dst = strtoul(env, &end, 10)) <= 0 || *end != 0)
die5(1, "Invalid value for $", name, ": '", env, "'");
}
static void prep_sender(void)
{
static char hostname[256];
char* p;
if ((sender = getenv("SENDER")) == 0) {
if (gethostname(hostname, sizeof hostname) != 0)
die1sys(1, "gethostname failed");
hostname[sizeof hostname - 1] = 0;
if ((p = strchr(hostname, '.')) != 0)
*p = 0;
sender = hostname;
}
}
int cli_main(int argc, char* argv[])
{
const char* server_name = 0;
const char* env;
msg_debug_init();
encr_start();
prep_sender();
service = argv[0];
if (argc > 1
&& argv[1][0] != '-'
&& argv[1][0] != '+') {
server_name = argv[1];
++argv;
--argc;
}
if (argc > 1)
load_patterns(argv + 1);
if (server_name == 0
&& (server_name = getenv("SERVER")) == 0)
die1(1, "Server address not named on command line nor in $SERVER");
if (!resolve_ipv4name(server_name, &ip))
die3(1, "Could not resolve '", server_name, "'");
brandom_init();
if ((env = getenv("KEYDIR")) != 0)
keydir = env;
load_keys(server_name);
if ((env = getenv("PORT")) != 0)
port = strtoul(env, 0, 10);
if (port == 0)
port = 11014;
if ((sock = socket_udp()) == -1)
die1sys(1, "Could not create UDP socket");
if (!socket_connect4(sock, &ip, port))
die1sys(1, "Could not bind socket");
if (!str_ready(&packet, 65535)
|| !str_ready(&rpacket, 4+4+8+256*5))
die1(1, "Out of memory");
getenvu("ACK_TIMEOUT", &ack_timeout);
getenvu("CID_TIMEOUT", &cid_timeout);
getenvu("RETRANSMITS", &retransmits);
getenvu("READWAIT", &readwait);
getenvu("STARTLINES", &startlines);
if (getenv("EXITONEOF") != 0)
exitoneof = 1;
if (getenv("NOFILES") == 0 && getenv("NOFILE") == 0)
buffer = buffer_file_init();
else
buffer = buffer_nofile_init();
sig_all_catch(sigfn);
exitasap = 0;
mainloop();
return 0;
}