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avformat/rtmpproto: guard usage of undefined functions with preprocessor

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The asumption is that DCE will remove references to those functions.
However some compilers with certain instrumentation enabled doesn't DCE
those at all, resulting in linking failure. Tested with cl.exe -RTCu -RTCs.

Signed-off-by: Kacper Michajłow <kasper93@gmail.com>
This commit is contained in:
Kacper Michajłow
2025-07-21 01:45:23 +02:00
parent 40b56c6536
commit d12863a693
1 changed files with 24 additions and 7 deletions
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31
libavformat/rtmpproto.c
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@ -1256,7 +1256,10 @@ static int rtmp_handshake(URLContext *s, RTMPContext *rt)
int i;
int server_pos, client_pos;
uint8_t digest[32], signature[32];
int ret, type = 0;
int ret;
#if CONFIG_FFRTMPCRYPT_PROTOCOL
int type = 0;
#endif
av_log(s, AV_LOG_DEBUG, "Handshaking...\n");
@ -1265,7 +1268,8 @@ static int rtmp_handshake(URLContext *s, RTMPContext *rt)
for (i = 9; i <= RTMP_HANDSHAKE_PACKET_SIZE; i++)
tosend[i] = av_lfg_get(&rnd) >> 24;
if (CONFIG_FFRTMPCRYPT_PROTOCOL && rt->encrypted) {
#if CONFIG_FFRTMPCRYPT_PROTOCOL
if (rt->encrypted) {
/* When the client wants to use RTMPE, we have to change the command
* byte to 0x06 which means to use encrypted data and we have to set
* the flash version to at least 9.0.115.0. */
@ -1280,6 +1284,7 @@ static int rtmp_handshake(URLContext *s, RTMPContext *rt)
if ((ret = ff_rtmpe_gen_pub_key(rt->stream, tosend + 1)) < 0)
return ret;
}
#endif
client_pos = rtmp_handshake_imprint_with_digest(tosend + 1, rt->encrypted);
if (client_pos < 0)
@ -1313,7 +1318,9 @@ static int rtmp_handshake(URLContext *s, RTMPContext *rt)
return server_pos;
if (!server_pos) {
#if CONFIG_FFRTMPCRYPT_PROTOCOL
type = 1;
#endif
server_pos = rtmp_validate_digest(serverdata + 1, 8);
if (server_pos < 0)
return server_pos;
@ -1343,7 +1350,8 @@ static int rtmp_handshake(URLContext *s, RTMPContext *rt)
if (ret < 0)
return ret;
if (CONFIG_FFRTMPCRYPT_PROTOCOL && rt->encrypted) {
#if CONFIG_FFRTMPCRYPT_PROTOCOL
if (rt->encrypted) {
/* Compute the shared secret key sent by the server and initialize
* the RC4 encryption. */
if ((ret = ff_rtmpe_compute_secret_key(rt->stream, serverdata + 1,
@ -1353,6 +1361,7 @@ static int rtmp_handshake(URLContext *s, RTMPContext *rt)
/* Encrypt the signature received by the server. */
ff_rtmpe_encrypt_sig(rt->stream, signature, digest, serverdata[0]);
}
#endif
if (memcmp(signature, clientdata + RTMP_HANDSHAKE_PACKET_SIZE - 32, 32)) {
av_log(s, AV_LOG_ERROR, "Signature mismatch\n");
@ -1373,25 +1382,30 @@ static int rtmp_handshake(URLContext *s, RTMPContext *rt)
if (ret < 0)
return ret;
if (CONFIG_FFRTMPCRYPT_PROTOCOL && rt->encrypted) {
#if CONFIG_FFRTMPCRYPT_PROTOCOL
if (rt->encrypted) {
/* Encrypt the signature to be send to the server. */
ff_rtmpe_encrypt_sig(rt->stream, tosend +
RTMP_HANDSHAKE_PACKET_SIZE - 32, digest,
serverdata[0]);
}
#endif
// write reply back to the server
if ((ret = ffurl_write(rt->stream, tosend,
RTMP_HANDSHAKE_PACKET_SIZE)) < 0)
return ret;
if (CONFIG_FFRTMPCRYPT_PROTOCOL && rt->encrypted) {
#if CONFIG_FFRTMPCRYPT_PROTOCOL
if (rt->encrypted) {
/* Set RC4 keys for encryption and update the keystreams. */
if ((ret = ff_rtmpe_update_keystream(rt->stream)) < 0)
return ret;
}
#endif
} else {
if (CONFIG_FFRTMPCRYPT_PROTOCOL && rt->encrypted) {
#if CONFIG_FFRTMPCRYPT_PROTOCOL
if (rt->encrypted) {
/* Compute the shared secret key sent by the server and initialize
* the RC4 encryption. */
if ((ret = ff_rtmpe_compute_secret_key(rt->stream, serverdata + 1,
@ -1404,16 +1418,19 @@ static int rtmp_handshake(URLContext *s, RTMPContext *rt)
serverdata[0]);
}
}
#endif
if ((ret = ffurl_write(rt->stream, serverdata + 1,
RTMP_HANDSHAKE_PACKET_SIZE)) < 0)
return ret;
if (CONFIG_FFRTMPCRYPT_PROTOCOL && rt->encrypted) {
#if CONFIG_FFRTMPCRYPT_PROTOCOL
if (rt->encrypted) {
/* Set RC4 keys for encryption and update the keystreams. */
if ((ret = ff_rtmpe_update_keystream(rt->stream)) < 0)
return ret;
}
#endif
}
return 0;