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/*
20160226
Jan Mojzis
Public domain.
*/
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
#include "log.h"
#include "packet.h"
#include "ssh.h"
#include "bug.h"
#include "packetparser.h"
#include "global.h"
static void cleanup(void) { global_purge(); }
__attribute__((noreturn)) static void die_fatal(const char *trouble,
const char *d, const char *fn) {
cleanup();
if (d) {
if (fn)
log_f5(trouble, " ", d, "/", fn);
else
log_f3(trouble, " ", d);
}
else { log_f1(trouble); }
_exit(111);
}
static int packet_disconnect_(struct buf *b) {
buf_purge(b);
buf_putnum8(b, SSH_MSG_DISCONNECT); /* byte SSH_MSG_DISCONNECT */
buf_putnum32(b, 0); /* uint32 reason code */
buf_putstring(b, "bye"); /* string description in ISO-10646 UTF-8
encoding [RFC3629] */
buf_putstring(b, ""); /* string language tag [RFC3066] */
packet_put(b);
return packet_sendall();
}
#if 0
static int _packet_debug(struct buf *b) {
buf_purge(b);
buf_putnum8(b, SSH_MSG_DEBUG); /* SSH_MSG_DEBUG */
buf_putnum8(b, 1); /* always_display */
buf_putstring(b, "test message"); /* message in ISO-10646 UTF-8 encoding [RFC3629] */
buf_putstring(b, ""); /* language tag [RFC3066] */
packet_put(b);
return packet_sendall();
}
#endif
static int packet_kex_receive_(void) {
struct buf *b = &packet.kexrecv;
long long pos = 0;
crypto_uint8 ch;
crypto_uint32 len;
if (!packet_getall(b, SSH_MSG_KEXINIT)) return 0;
/* parse packet */
pos = packetparser_uint8(b->buf, b->len, pos, &ch); /* SSH_MSG_KEXINIT */
if (ch != SSH_MSG_KEXINIT) bug_proto();
pos = packetparser_skip(b->buf, b->len, pos, 16); /* cookie */
pos = packetparser_uint32(b->buf, b->len, pos, &len); /* kex algorithms */
pos = packetparser_skip(b->buf, b->len, pos, len);
log_i2("kex algorithms: ", (char *) b->buf + pos - len);
pos = packetparser_uint32(b->buf, b->len, pos,
&len); /* server host key algorithms */
pos = packetparser_skip(b->buf, b->len, pos, len);
log_i2("server host key algorithms: ", (char *) b->buf + pos - len);
pos = packetparser_uint32(
b->buf, b->len, pos, &len); /* encryption algorithms client to server */
pos = packetparser_skip(b->buf, b->len, pos, len);
log_i2("encryption algorithms client to server: ",
(char *) b->buf + pos - len);
pos = packetparser_uint32(
b->buf, b->len, pos, &len); /* encryption algorithms server to client */
pos = packetparser_skip(b->buf, b->len, pos, len);
log_i2("encryption algorithms server to client: ",
(char *) b->buf + pos - len);
pos = packetparser_uint32(b->buf, b->len, pos,
&len); /* mac algorithms client to server */
pos = packetparser_skip(b->buf, b->len, pos, len);
log_i2("mac algorithms client to server: ", (char *) b->buf + pos - len);
pos = packetparser_uint32(b->buf, b->len, pos,
&len); /* mac algorithms server to client */
pos = packetparser_skip(b->buf, b->len, pos, len);
log_i2("mac algorithms server to client: ", (char *) b->buf + pos - len);
pos = packetparser_uint32(b->buf, b->len, pos,
&len); /* compress algorithms client to server */
pos = packetparser_skip(b->buf, b->len, pos, len);
pos = packetparser_uint32(b->buf, b->len, pos,
&len); /* compress algorithms server to client */
pos = packetparser_skip(b->buf, b->len, pos, len);
pos = packetparser_uint32(b->buf, b->len, pos,
&len); /* languages client to server */
pos = packetparser_skip(b->buf, b->len, pos, len);
pos = packetparser_uint32(b->buf, b->len, pos,
&len); /* languages server to client */
pos = packetparser_skip(b->buf, b->len, pos, len);
pos = packetparser_uint8(b->buf, b->len, pos,
&ch); /* kex first packet follows */
pos = packetparser_uint32(b->buf, b->len, pos, &len); /* reserved */
return 1;
}
static unsigned char bspace[1024];
static struct buf b;
int main(int argc, char **argv) {
pid_t pid;
int tochild[2] = {-1, -1};
int fromchild[2] = {-1, -1};
if (argc < 2) _exit(111);
if (!argv[0]) _exit(111);
if (!argv[1]) _exit(111);
++argv;
buf_init(&b, bspace, sizeof bspace);
if (pipe(tochild) == -1) _exit(111);
if (pipe(fromchild) == -1) _exit(111);
pid = fork();
if (pid == -1) _exit(111);
if (pid == 0) {
close(tochild[1]);
close(fromchild[0]);
if (dup2(tochild[0], 0) == -1) _exit(111);
if (dup2(fromchild[1], 1) == -1) _exit(111);
execvp(*argv, argv);
_exit(111);
}
close(tochild[0]);
close(fromchild[1]);
close(0);
if (dup2(fromchild[0], 0) == -1) _exit(111);
close(1);
if (dup2(tochild[1], 1) == -1) _exit(111);
signal(SIGPIPE, SIG_IGN);
global_init();
log_init(0, "_tinysshd-test-kex1", 0, 0);
if (!packet_hello_receive())
die_fatal("unable to receive hello-string", 0, 0);
if (!packet_hello_send()) die_fatal("unable to send hello-string", 0, 0);
if (!packet_kex_receive_())
die_fatal("unable to receive kex-message", 0, 0);
if (!packet_disconnect_(&b))
die_fatal("unable to send disconnect-message", 0, 0);
_exit(111);
}
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