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/*
20140211
Jan Mojzis
Public domain.
*/
#include "bug.h"
#include "buf.h"
#include "channel.h"
#include "ssh.h"
#include "bug.h"
#include "crypto_uint32.h"
#include "packet.h"
void packet_channel_send_data(struct buf *b) {
long long r;
long long limit = PACKET_LIMIT;
if (channel.maxpacket > 0) {
if (channel.maxpacket < PACKET_LIMIT) { limit = channel.maxpacket; }
}
buf_purge(b);
if (b->alloc <= PACKET_LIMIT) bug_nomem();
if (!packet_putisready()) return;
r = channel_read(b->buf + 9, limit - 9);
if (r == 0) return;
b->len = r + 9;
b->buf[0] = SSH_MSG_CHANNEL_DATA; /* byte SSH_MSG_CHANNEL_DATA */
crypto_uint32_store_bigendian(
b->buf + 1, channel_getid()); /* uint32 recipient channel */
crypto_uint32_store_bigendian(b->buf + 5, r); /* string data */
packet_put(b);
buf_purge(b);
return;
}
void packet_channel_send_extendeddata(struct buf *b) {
long long r;
long long limit = PACKET_LIMIT;
if (channel.maxpacket > 0) {
if (channel.maxpacket < PACKET_LIMIT) { limit = channel.maxpacket; }
}
buf_purge(b);
if (b->alloc <= PACKET_LIMIT) bug_nomem();
if (!packet_putisready()) return;
r = channel_extendedread(b->buf + 13, limit - 13);
if (r == 0) return;
b->len = r + 13;
b->buf[0] =
SSH_MSG_CHANNEL_EXTENDED_DATA; /* byte SSH_MSG_CHANNEL_EXTENDED_DATA */
crypto_uint32_store_bigendian(
b->buf + 1, channel_getid()); /* uint32 recipient channel */
crypto_uint32_store_bigendian(
b->buf + 5, 1); /* uint32 data_type_code (1 = stderr) */
crypto_uint32_store_bigendian(b->buf + 9, r); /* string data */
packet_put(b);
buf_purge(b);
return;
}
int packet_channel_send_windowadjust(struct buf *b) {
crypto_uint32 plus;
if (channel_getlen0() > CHANNEL_BUFSIZE / 2) return 1;
if (channel_getlocalwindow() > CHANNEL_BUFSIZE / 2) return 1;
buf_purge(b);
buf_putnum8(b, SSH_MSG_CHANNEL_WINDOW_ADJUST);
buf_putnum32(b, channel_getid());
plus = CHANNEL_BUFSIZE - channel_getlen0() - channel_getlocalwindow();
buf_putnum32(b, plus);
channel_incrementlocalwindow(plus);
packet_put(b);
buf_purge(b);
return 1;
}
void packet_channel_send_eof(struct buf *b) {
if (packet.flageofsent) return;
buf_purge(b);
buf_putnum8(b, SSH_MSG_CHANNEL_EOF);
buf_putnum32(b, channel_getid());
packet_put(b);
buf_purge(b);
packet.flageofsent = 1;
}
int packet_channel_send_close(struct buf *b, int exitsignal, int exitcode) {
packet_channel_send_eof(b);
if (packet.flagclosesent) return 1;
if (exitsignal > 0) {
buf_purge(b);
buf_putnum8(b,
SSH_MSG_CHANNEL_REQUEST); /* byte SSH_MSG_CHANNEL_REQUEST */
buf_putnum32(b, channel_getid()); /* uint32 recipient channel */
buf_putstring(b, "exit-signal"); /* string "exit-signal" */
buf_putnum8(b, 0); /* boolean FALSE */
buf_putstring(b,
ssh_sigstr(exitsignal)); /* string signal name (without
the "SIG" prefix) */
buf_putnum8(b, 0); /* boolean core dumped */
buf_putstring(
b, ssh_sigstrlong(exitsignal)); /* string error message in
ISO-10646 UTF-8 encoding */
buf_putstring(b, ""); /* string language tag [RFC3066] */
packet_put(b);
buf_purge(b);
if (!packet_sendall()) return 0;
}
else {
buf_purge(b);
buf_putnum8(b,
SSH_MSG_CHANNEL_REQUEST); /* byte SSH_MSG_CHANNEL_REQUEST */
buf_putnum32(b, channel_getid()); /* uint32 recipient channel */
buf_putstring(b, "exit-status"); /* string "exit-status" */
buf_putnum8(b, 0); /* boolean FALSE */
buf_putnum32(b, exitcode); /* uint32 exit_status */
packet_put(b);
buf_purge(b);
if (!packet_sendall()) return 0;
}
buf_purge(b);
buf_putnum8(b, SSH_MSG_CHANNEL_CLOSE); /* byte SSH_MSG_CHANNEL_CLOSE */
buf_putnum32(b, channel_getid()); /* uint32 recipient channel */
packet_put(b);
if (!packet_sendall()) return 0;
buf_purge(b);
packet.flagclosesent = 1;
return 1;
}
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