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Put handling of incoming data on agent channels into its own function.

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This function can be shared between SSH-1 and SSH-2, and makes the
per-protocol data-handling functions more generic.
This commit is contained in:
Ben Harris 2016-04-22 23:00:46 +01:00
parent b22c0b6f3e
commit 5347f9e69c
1 changed files with 44 additions and 83 deletions
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127
ssh.c
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@ -5751,6 +5751,48 @@ static void ssh1_msg_channel_close(Ssh ssh, struct Packet *pktin)
}
}
/*
* Handle incoming data on an SSH-1 or SSH-2 agent-forwarding channel.
*/
static int ssh_agent_channel_data(struct ssh_channel *c, char *data,
int length)
{
while (length > 0) {
if (c->u.a.lensofar < 4) {
unsigned int l = min(4 - c->u.a.lensofar, (unsigned)length);
memcpy(c->u.a.msglen + c->u.a.lensofar, data, l);
data += l;
length -= l;
c->u.a.lensofar += l;
}
if (c->u.a.lensofar == 4) {
c->u.a.totallen = 4 + GET_32BIT(c->u.a.msglen);
c->u.a.message = snewn(c->u.a.totallen, unsigned char);
memcpy(c->u.a.message, c->u.a.msglen, 4);
}
if (c->u.a.lensofar >= 4 && length > 0) {
unsigned int l = min(c->u.a.totallen - c->u.a.lensofar,
(unsigned)length);
memcpy(c->u.a.message + c->u.a.lensofar, data, l);
data += l;
length -= l;
c->u.a.lensofar += l;
}
if (c->u.a.lensofar == c->u.a.totallen) {
void *reply;
int replylen;
c->u.a.outstanding_requests++;
if (agent_query(c->u.a.message, c->u.a.totallen, &reply, &replylen,
ssh_agentf_callback, c))
ssh_agentf_callback(c, reply, replylen);
sfree(c->u.a.message);
c->u.a.message = NULL;
c->u.a.lensofar = 0;
}
}
return 0; /* agent channels never back up */
}
static void ssh1_msg_channel_data(Ssh ssh, struct Packet *pktin)
{
/* Data sent down one of our channels. */
@ -5772,47 +5814,7 @@ static void ssh1_msg_channel_data(Ssh ssh, struct Packet *pktin)
bufsize = pfd_send(c->u.pfd.pf, p, len);
break;
case CHAN_AGENT:
/* Data for an agent message. Buffer it. */
while (len > 0) {
if (c->u.a.lensofar < 4) {
unsigned int l = min(4 - c->u.a.lensofar, (unsigned)len);
memcpy(c->u.a.msglen + c->u.a.lensofar, p,
l);
p += l;
len -= l;
c->u.a.lensofar += l;
}
if (c->u.a.lensofar == 4) {
c->u.a.totallen =
4 + GET_32BIT(c->u.a.msglen);
c->u.a.message = snewn(c->u.a.totallen,
unsigned char);
memcpy(c->u.a.message, c->u.a.msglen, 4);
}
if (c->u.a.lensofar >= 4 && len > 0) {
unsigned int l =
min(c->u.a.totallen - c->u.a.lensofar,
(unsigned)len);
memcpy(c->u.a.message + c->u.a.lensofar, p,
l);
p += l;
len -= l;
c->u.a.lensofar += l;
}
if (c->u.a.lensofar == c->u.a.totallen) {
void *reply;
int replylen;
c->u.a.outstanding_requests++;
if (agent_query(c->u.a.message,
c->u.a.totallen,
&reply, &replylen,
ssh_agentf_callback, c))
ssh_agentf_callback(c, reply, replylen);
sfree(c->u.a.message);
c->u.a.lensofar = 0;
}
}
bufsize = 0; /* agent channels never back up */
bufsize = ssh_agent_channel_data(c, p, len);
break;
}
if (!c->throttling_conn && bufsize > SSH1_BUFFER_LIMIT) {
@ -8079,48 +8081,7 @@ static void ssh2_msg_channel_data(Ssh ssh, struct Packet *pktin)
bufsize = pfd_send(c->u.pfd.pf, data, length);
break;
case CHAN_AGENT:
while (length > 0) {
if (c->u.a.lensofar < 4) {
unsigned int l = min(4 - c->u.a.lensofar,
(unsigned)length);
memcpy(c->u.a.msglen + c->u.a.lensofar,
data, l);
data += l;
length -= l;
c->u.a.lensofar += l;
}
if (c->u.a.lensofar == 4) {
c->u.a.totallen =
4 + GET_32BIT(c->u.a.msglen);
c->u.a.message = snewn(c->u.a.totallen,
unsigned char);
memcpy(c->u.a.message, c->u.a.msglen, 4);
}
if (c->u.a.lensofar >= 4 && length > 0) {
unsigned int l =
min(c->u.a.totallen - c->u.a.lensofar,
(unsigned)length);
memcpy(c->u.a.message + c->u.a.lensofar,
data, l);
data += l;
length -= l;
c->u.a.lensofar += l;
}
if (c->u.a.lensofar == c->u.a.totallen) {
void *reply;
int replylen;
c->u.a.outstanding_requests++;
if (agent_query(c->u.a.message,
c->u.a.totallen,
&reply, &replylen,
ssh_agentf_callback, c))
ssh_agentf_callback(c, reply, replylen);
sfree(c->u.a.message);
c->u.a.message = NULL;
c->u.a.lensofar = 0;
}
}
bufsize = 0;
bufsize = ssh_agent_channel_data(c, data, length);
break;
}
/*