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/*
20140125
20241210 - reformated using clang-format
Jan Mojzis
Public domain.
*/
#include "buf.h"
#include "byte.h"
#include "writeall.h"
#include "purge.h"
#include "log.h"
#include "str.h"
#include "getln.h"
#include "e.h"
#include "packet.h"
/*
The 'packet_hello_send()' function sends SSH hello string to the client.
See RFC 4253 4.2. Protocol Version Exchange.
Example: SSH-2.0-tinyssh_20160201 iX512l8j
*/
int packet_hello_send(void) {
struct buf *b = &packet.hellosend;
buf_purge(b);
buf_puts(b, "SSH-2.0-tinyssh");
#ifdef VERSION
buf_puts(b, "_");
buf_puts(b, VERSION);
#endif
buf_puts(b, " ");
buf_puts(b, log_string());
buf_puts(b, "\r\n");
if (writeall(1, b->buf, b->len) == -1) return 0;
b->len -= 2; /* remove "\r\n" */
b->buf[b->len] = 0;
log_d2("hello: server: ", (char *) (b->buf));
purge(b->buf + b->len, b->alloc - b->len);
return 1;
}
/*
The 'packet_hello_receive()' function receives SSH hello string from the client.
See RFC 4253 4.2. Protocol Version Exchange.
Example: SSH-2.0-OpenSSH_6.6.1p1 Debian-4~bpo70+1
*/
int packet_hello_receive(void) {
int r;
struct buf *b = &packet.helloreceive;
r = getln(0, b->buf, b->alloc);
if (r == 0) {
errno = ECONNRESET;
return 0;
}
if (r != 1) return 0;
b->len = str_len((char *) b->buf);
if (b->len < 6) {
errno = EPROTO;
return 0;
}
if (b->buf[b->len - 1] == '\n') --(b->len); /* remove '\n' */
if (b->buf[b->len - 1] == '\r') --(b->len); /* remove '\r' */
b->buf[b->len] = 0;
if (!byte_isequal(b->buf, 4, "SSH-")) {
errno = EPROTO;
return 0;
}
log_d2("hello: client: ", (char *) b->buf);
purge(b->buf + b->len, b->alloc - b->len);
return 1;
}
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