近期优化librtsp库的一些总结
1、rtsp增加认证功能；
DESCRIBER请求返回401，针对携带的用户名、密码登字段，解析出来并做MD5校验。
if (pRtsp->auth_checked != 1){
if ((p = strstr(pRtsp->in_buffer, HDR_AUTH)) == NULL)
{
printf( "Error %s,%i p:%s\n", __FILE__, __LINE__, p);
send_401_response(pRtsp);
return ERR_NOERROR;
}
//check auth
/*
*
Authorization: Digest username="admin", realm=“000102030405”, nonce=“59caf6cbb9d5dd0ae2a168059919f559”, uri=“rtsp://10.175.30.35”, response=“039837838f10192c7dcb98b0485265e9”
Authorization: Digest username="admin", realm="RTSPRealServer", nonce="31d68edb78591ab93655a66b2bd37d5d", uri="rtsp://192.168.16.34:554/live/0", response="a4f367f8db865b051d924388a9543880"
*/
char username[64], realm[64], nonce[64], uri_auth[256], client_response[33];
int ret = sscanf(p, "Authorization: Digest username=\"%255[^\"]\",",username);
p = strstr(p, "realm");
ret = sscanf(p, "realm=\"%255[^\"]\",",realm);
p = strstr(p, "nonce");
ret = sscanf(p, "nonce=\"%255[^\"]\",",nonce);
p = strstr(p, "uri");
ret = sscanf(p, "uri=\"%255[^\"]\",",uri_auth);
p = strstr(p, "response");
ret = sscanf(p, "response=\"%255[^\"]\",",client_response);
printf( "Error %s,%i username:%s, realm:%s, nonce:%s, uri_auth:%s, response:%s,ret:%d\n", __FILE__, __LINE__, username, realm, nonce, uri_auth, client_response, ret);
size_t fileSize = 0;
char *adminContent = readFileContents("/userdata/admin.config", &fileSize);
if (adminContent == NULL){
adminContent = "admin";
}
if (!validate_digest(username, adminContent, realm, nonce, RTSP_METHOD_DESCRIBE, uri_auth, client_response)) {
printf( "Error %s,%i\n", __FILE__, __LINE__);
send_401_response(pRtsp);
return ERR_NOERROR;
}
pRtsp->auth_checked = 1;
}校验规则：
// password 为ascii response= md5( md5(username:realm:password):nonce:md5(public_method:url) );
// 验证客户端 response 是否正确
int validate_digest(
const char *username,
const char *password,
const char *realm,
const char *nonce,
const char *method,
const char *uri,
const char *client_response
) {
char ha1[33], ha2[33], server_response[33];
// HA1 = MD5(username:realm:password)
char buffer[256];
snprintf(buffer, sizeof(buffer), "%s:%s:%s", username, realm, password);
md5_hash(buffer, ha1);
// HA2 = MD5(method:uri)
snprintf(buffer, sizeof(buffer), "%s:%s", method, uri);
md5_hash(buffer, ha2);
// 计算 Server Response = MD5(HA1:nonce:HA2)
// password 为ascii response= md5( md5(username:realm:password):nonce:md5(public_method:url) );
snprintf(buffer, sizeof(buffer), "%s:%s:%s", ha1, nonce, ha2);
md5_hash(buffer, server_response);
return strcmp(server_response, client_response) == 0;
}md5.h/md5.c
/*
头文件：md5.h
```c
*/
/**
* \brief MD5 context structure
*/
typedef struct
{
unsigned long total[2]; /*!< number of bytes processed */
unsigned long state[4]; /*!< intermediate digest state */
unsigned char buffer[64]; /*!< data block being processed */
}md5_context;
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief MD5 context setup
*
* \param ctx context to be initialized
*/
void md5_starts(md5_context* ctx);
/**
* \brief MD5 process buffer
*
* \param ctx MD5 context
* \param input buffer holding the data
* \param ilen length of the input data
*/
void md5_update(md5_context* ctx, const unsigned char* input, int ilen);
/**
* \brief MD5 final digest
*
* \param ctx MD5 context
* \param output MD5 checksum result
*/
void md5_finish(md5_context* ctx, unsigned char output[16]);
/**
* \brief Output = MD5( input buffer )
*
* \param input buffer holding the data
* \param ilen length of the input data
* \param output MD5 checksum result
*/
void md5(unsigned char* input, int ilen, unsigned char output[16]);
#ifdef __cplusplus
}
#endif
#include "md5.h"
#include <string.h>
#include "stdio.h"
/*
* 32-bit integer manipulation macros (little endian)
*/
#ifndef GET_ULONG_LE
#define GET_ULONG_LE(n,b,i) \
{ \
(n) = ( (unsigned long) (b)[(i) ] ) \
| ( (unsigned long) (b)[(i) + 1] << 8 ) \
| ( (unsigned long) (b)[(i) + 2] << 16 ) \
| ( (unsigned long) (b)[(i) + 3] << 24 ); \
}
#endif
#ifndef PUT_ULONG_LE
#define PUT_ULONG_LE(n,b,i) \
{ \
(b)[(i) ] = (unsigned char) ( (n) ); \
(b)[(i) + 1] = (unsigned char) ( (n) >> 8 ); \
(b)[(i) + 2] = (unsigned char) ( (n) >> 16 ); \
(b)[(i) + 3] = (unsigned char) ( (n) >> 24 ); \
}
#endif
/*
* MD5 context setup
*/
void md5_starts(md5_context* ctx)
{
ctx->total[0] = 0;
ctx->total[1] = 0;
ctx->state[0] = 0x67452301;
ctx->state[1] = 0xEFCDAB89;
ctx->state[2] = 0x98BADCFE;
ctx->state[3] = 0x10325476;
}
static void md5_process(md5_context* ctx, const unsigned char data[64])
{
unsigned long X[16], A, B, C, D;
GET_ULONG_LE(X[0], data, 0);
GET_ULONG_LE(X[1], data, 4);
GET_ULONG_LE(X[2], data, 8);
GET_ULONG_LE(X[3], data, 12);
GET_ULONG_LE(X[4], data, 16);
GET_ULONG_LE(X[5], data, 20);
GET_ULONG_LE(X[6], data, 24);
GET_ULONG_LE(X[7], data, 28);
GET_ULONG_LE(X[8], data, 32);
GET_ULONG_LE(X[9], data, 36);
GET_ULONG_LE(X[10], data, 40);
GET_ULONG_LE(X[11], data, 44);
GET_ULONG_LE(X[12], data, 48);
GET_ULONG_LE(X[13], data, 52);
GET_ULONG_LE(X[14], data, 56);
GET_ULONG_LE(X[15], data, 60);
#define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
#define P(a,b,c,d,k,s,t) \
{ \
a += F(b,c,d) + X[k] + t; a = S(a,s) + b; \
}
A = ctx->state[0];
B = ctx->state[1];
C = ctx->state[2];
D = ctx->state[3];
#define F(x,y,z) (z ^ (x & (y ^ z)))
P(A, B, C, D, 0, 7, 0xD76AA478);
P(D, A, B, C, 1, 12, 0xE8C7B756);
P(C, D, A, B, 2, 17, 0x242070DB);
P(B, C, D, A, 3, 22, 0xC1BDCEEE);
P(A, B, C, D, 4, 7, 0xF57C0FAF);
P(D, A, B, C, 5, 12, 0x4787C62A);
P(C, D, A, B, 6, 17, 0xA8304613);
P(B, C, D, A, 7, 22, 0xFD469501);
P(A, B, C, D, 8, 7, 0x698098D8);
P(D, A, B, C, 9, 12, 0x8B44F7AF);
P(C, D, A, B, 10, 17, 0xFFFF5BB1);
P(B, C, D, A, 11, 22, 0x895CD7BE);
P(A, B, C, D, 12, 7, 0x6B901122);
P(D, A, B, C, 13, 12, 0xFD987193);
P(C, D, A, B, 14, 17, 0xA679438E);
P(B, C, D, A, 15, 22, 0x49B40821);
#undef F
#define F(x,y,z) (y ^ (z & (x ^ y)))
P(A, B, C, D, 1, 5, 0xF61E2562);
P(D, A, B, C, 6, 9, 0xC040B340);
P(C, D, A, B, 11, 14, 0x265E5A51);
P(B, C, D, A, 0, 20, 0xE9B6C7AA);
P(A, B, C, D, 5, 5, 0xD62F105D);
P(D, A, B, C, 10, 9, 0x02441453);
P(C, D, A, B, 15, 14, 0xD8A1E681);
P(B, C, D, A, 4, 20, 0xE7D3FBC8);
P(A, B, C, D, 9, 5, 0x21E1CDE6);
P(D, A, B, C, 14, 9, 0xC33707D6);
P(C, D, A, B, 3, 14, 0xF4D50D87);
P(B, C, D, A, 8, 20, 0x455A14ED);
P(A, B, C, D, 13, 5, 0xA9E3E905);
P(D, A, B, C, 2, 9, 0xFCEFA3F8);
P(C, D, A, B, 7, 14, 0x676F02D9);
P(B, C, D, A, 12, 20, 0x8D2A4C8A);
#undef F
#define F(x,y,z) (x ^ y ^ z)
P(A, B, C, D, 5, 4, 0xFFFA3942);
P(D, A, B, C, 8, 11, 0x8771F681);
P(C, D, A, B, 11, 16, 0x6D9D6122);
P(B, C, D, A, 14, 23, 0xFDE5380C);
P(A, B, C, D, 1, 4, 0xA4BEEA44);
P(D, A, B, C, 4, 11, 0x4BDECFA9);
P(C, D, A, B, 7, 16, 0xF6BB4B60);
P(B, C, D, A, 10, 23, 0xBEBFBC70);
P(A, B, C, D, 13, 4, 0x289B7EC6);
P(D, A, B, C, 0, 11, 0xEAA127FA);
P(C, D, A, B, 3, 16, 0xD4EF3085);
P(B, C, D, A, 6, 23, 0x04881D05);
P(A, B, C, D, 9, 4, 0xD9D4D039);
P(D, A, B, C, 12, 11, 0xE6DB99E5);
P(C, D, A, B, 15, 16, 0x1FA27CF8);
P(B, C, D, A, 2, 23, 0xC4AC5665);
#undef F
#define F(x,y,z) (y ^ (x | ~z))
P(A, B, C, D, 0, 6, 0xF4292244);
P(D, A, B, C, 7, 10, 0x432AFF97);
P(C, D, A, B, 14, 15, 0xAB9423A7);
P(B, C, D, A, 5, 21, 0xFC93A039);
P(A, B, C, D, 12, 6, 0x655B59C3);
P(D, A, B, C, 3, 10, 0x8F0CCC92);
P(C, D, A, B, 10, 15, 0xFFEFF47D);
P(B, C, D, A, 1, 21, 0x85845DD1);
P(A, B, C, D, 8, 6, 0x6FA87E4F);
P(D, A, B, C, 15, 10, 0xFE2CE6E0);
P(C, D, A, B, 6, 15, 0xA3014314);
P(B, C, D, A, 13, 21, 0x4E0811A1);
P(A, B, C, D, 4, 6, 0xF7537E82);
P(D, A, B, C, 11, 10, 0xBD3AF235);
P(C, D, A, B, 2, 15, 0x2AD7D2BB);
P(B, C, D, A, 9, 21, 0xEB86D391);
#undef F
ctx->state[0] += A;
ctx->state[1] += B;
ctx->state[2] += C;
ctx->state[3] += D;
}
/*
* MD5 process buffer
*/
void md5_update(md5_context* ctx, const unsigned char* input, int ilen)
{
int fill;
unsigned long left;
if (ilen <= 0)
return;
left = ctx->total[0] & 0x3F;
fill = 64 - left;
ctx->total[0] += ilen;
ctx->total[0] &= 0xFFFFFFFF;
if (ctx->total[0] < (unsigned long)ilen)
ctx->total[1]++;
if (left && ilen >= fill)
{
memcpy((void*)(ctx->buffer + left),
input, fill);
md5_process(ctx, ctx->buffer);
input += fill;
ilen -= fill;
left = 0;
}
while (ilen >= 64)
{
md5_process(ctx, input);
input += 64;
ilen -= 64;
}
if (ilen > 0)
{
memcpy((void*)(ctx->buffer + left),
input, ilen);
}
}
static const unsigned char md5_padding[64] =
{
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
/*
* MD5 final digest
*/
void md5_finish(md5_context* ctx, unsigned char output[16])
{
unsigned long last, padn;
unsigned long high, low;
unsigned char msglen[8];
high = (ctx->total[0] >> 29)
| (ctx->total[1] << 3);
low = (ctx->total[0] << 3);
PUT_ULONG_LE(low, msglen, 0);
PUT_ULONG_LE(high, msglen, 4);
last = ctx->total[0] & 0x3F;
padn = (last < 56) ? (56 - last) : (120 - last);
md5_update(ctx, md5_padding, padn);
md5_update(ctx, msglen, 8);
PUT_ULONG_LE(ctx->state[0], output, 0);
PUT_ULONG_LE(ctx->state[1], output, 4);
PUT_ULONG_LE(ctx->state[2], output, 8);
PUT_ULONG_LE(ctx->state[3], output, 12);
}
/*
* output = MD5( input buffer )
*/
void md5(unsigned char* input, int ilen, unsigned char output[16])
{
md5_context ctx;
memset(&ctx, 0, sizeof(md5_context));
md5_starts(&ctx);
md5_update(&ctx, input, ilen);
md5_finish(&ctx, output);
}rtsp server线程模型的修改。
1、保活option包的处理，vlc是每隔1分钟会给服务器发送option包，必须回复200 OK，否则vlc不继续播放；
2、上述线程模型会出现第3个客户端接入不了，这里面即包括线程切换，又包括线程优先级问题。
修改是接入的客户端还是在同一个epoll线程中处理rtsp消息，这样就不会阻塞其他客户端的接入。
SR包的发送：
#define NTP_TIMESTAMP_DELTA 2208988800ull // 1900Äêµ½1970ÄêµÄÃëÊý
#pragma pack(push, 1)
typedef struct {
uint8_t version; // °æ±¾ (2 << 6)
//unsigned char version:2;
//unsigned char padding:1;
//unsigned char rc:5;
unsigned char type;
unsigned short length;
unsigned int ssrc;
unsigned int ntp_timestamp_high;
unsigned int ntp_timestamp_low;
unsigned int rtpTimestamp;
unsigned int packetCount;
unsigned int octetCount;
} RTCPSR;
void sendSRPacket(unsigned int u32Rtp, StreamStats *stats)
{
HndRtp hRtp = (HndRtp)u32Rtp;
uint8_t buf[512];
if(hRtp){
struct timeval tv;
gettimeofday(&tv, NULL);
uint64_t ntp_high = tv.tv_sec + 2208988800U; //
uint64_t ntp_low = (unsigned int)((tv.tv_usec * 4294.967296) + 0.5); //
int ssrc = hRtp->u32SSrc;
RTCPSR sr;
sr.version = 0x80 | (0 << 5) | 0; // V=2, P=0, RC=0; // V=2, P=0
sr.type = 200; // SRÀàÐÍ
sr.length = htons(6); // 7-1=6 (Í·+6¸ö32λ×Ö)
sr.ssrc = htonl(ssrc);
uint64_t ntp = getNTPTimestamp();
//sr.ntpTimestamp = htonll(ntp); // ×Ô¶¨Òå64λת»»
sr.ntp_timestamp_high = htonl(ntp_high);
sr.ntp_timestamp_low = htonl(ntp_low);
sr.rtpTimestamp = htonl(stats->lastRTPTime);
sr.packetCount = htonl(hRtp->packet_count);
sr.octetCount = htonl(stats->octetCount);
memcpy(buf, &sr, sizeof(sr));
int len = sizeof(sr);
printf("rtcp ssrc:%d rtpTimestamp :%d, packetCount:%d,oct:%d to send!\r\n",ssrc, stats->lastRTPTime,hRtp->packet_count, stats->octetCount);
if(sendto(hRtp->s32RtcpSock, buf, len, 0, (struct sockaddr *)&hRtp->stServRTCPAddr, sizeof(hRtp->stServRTCPAddr)) < 0){
printf("rtcp failed to send!\r\n");
}
stats->lastSRTime = ntp;
}
}2、音频打包的支持。
AAC打包rtp包时间戳给值：
#define AAC_SAMPLES_PER_FRAME 1760 // 每个AAC帧包含1760样本
//累加样本包
ts += AAC_SAMPLES_PER_FRAME;
VLC播放开始还可以，后面就不停地卡顿，不知道具体原因。
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