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htsp.c
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htsp.c
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/*
pidvbip - tvheadend client for the Raspberry Pi
(C) Dave Chapman 2012-2013
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <arpa/inet.h>
#include <netdb.h>
#include "sha1.h"
#include "htsp.h"
#include "debug.h"
typedef struct HTSSHA1 {
uint64_t count;
uint8_t buffer[64];
uint32_t state[5];
} HTSSHA1;
void htsp_init(struct htsp_t* htsp)
{
htsp->subscriptionId = 0;
pthread_mutex_init(&htsp->htsp_mutex,NULL);
}
void htsp_lock(struct htsp_t* htsp)
{
pthread_mutex_lock(&htsp->htsp_mutex);
}
void htsp_unlock(struct htsp_t* htsp)
{
pthread_mutex_unlock(&htsp->htsp_mutex);
}
static int create_tcp_socket()
{
int sock;
if((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0){
perror("Can't create TCP socket");
exit(1);
}
return sock;
}
static char *get_ip(char *host)
{
struct hostent *hent;
char *ip = calloc(INET_ADDRSTRLEN,1);
if((hent = gethostbyname(host)) == NULL)
{
herror("Can't get IP");
exit(1);
}
if(inet_ntop(AF_INET, (void *)hent->h_addr_list[0], ip, INET_ADDRSTRLEN) == NULL)
{
perror("Can't resolve host");
exit(1);
}
return ip;
}
int htsp_connect(struct htsp_t* htsp)
{
int res;
htsp->sock = create_tcp_socket();
if (htsp->ip == NULL)
htsp->ip = get_ip(htsp->host);
fprintf(stderr,"Connecting to %s (%s) port %d...\n",htsp->host,htsp->ip,htsp->port);
htsp->remote = (struct sockaddr_in *)malloc(sizeof(struct sockaddr_in));
htsp->remote->sin_family = AF_INET;
res = inet_pton(AF_INET, htsp->ip, (void *)(&(htsp->remote->sin_addr.s_addr)));
if (res < 0) {
perror("Can't set remote->sin_addr.s_addr");
exit(1);
} else if (res == 0) {
fprintf(stderr, "%s is not a valid IP address\n", htsp->ip);
return 1;
}
htsp->remote->sin_port = htons(htsp->port);
if (connect(htsp->sock, (struct sockaddr *)htsp->remote, sizeof(struct sockaddr)) < 0){
perror("Could not connect");
return 2;
}
return 0;
}
static char* hmf_labels[] = { "", "MAP","S64","STR","BIN","LIST","DBL" };
static int get_uint32_be(unsigned char* buf)
{
return((buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3]);
}
static void put_uint32_be(unsigned char* buf, uint32_t x)
{
buf[0] = (x >> 24) & 0xff;
buf[1] = (x >> 16) & 0xff;
buf[2] = (x >> 8) & 0xff;
buf[3] = x & 0xff;
}
void htsp_dump_binary(unsigned char* buf, int len)
{
int i;
uint64_t x = 0;
while (len > 0) {
int type = buf[0]; if (type > 6) { type = 0; }
int namelength = buf[1];
int datalength = get_uint32_be(buf + 2);
buf += 6; len -= 6;
fprintf(stderr,"type=%d, datalen=%d %s: ",type,datalength,hmf_labels[type]);
for (i=0;i<namelength;i++) { fprintf(stderr,"%c",buf[i]); }
buf += namelength; len -= namelength;
fprintf(stderr,"=");
switch (type) {
case HMF_STR:
fprintf(stderr,"\"");
for (i=0;i<datalength;i++) { fprintf(stderr,"%c",buf[i]); }
fprintf(stderr,"\"");
break;
case HMF_BIN:
fprintf(stderr,"\"");
//for (i=0;i<datalength;i++) { fprintf(stderr," 0x%02x",buf[i]); }
fprintf(stderr,"\"");
break;
case HMF_S64:
x = 0;
for (i=datalength-1;i>=0;i--) {
x <<= 8;
x |= buf[i];
}
fprintf(stderr,"%lld",x);
fprintf(stderr," [");
for (i=0;i<datalength;i++) { fprintf(stderr," 0x%02x",buf[i]); }
fprintf(stderr," ]");
break;
case HMF_LIST:
case HMF_MAP:
fprintf(stderr,"\n");
htsp_dump_binary(buf, datalength);
break;
default:
break;
}
fprintf(stderr,"\n");
buf += datalength; len -= datalength;
}
}
void htsp_dump_message(struct htsp_message_t* msg)
{
htsp_dump_binary(msg->msg + 4, msg->msglen - 4);
}
void htsp_destroy_message(struct htsp_message_t* msg)
{
free(msg->msg);
}
int htsp_create_message(struct htsp_message_t* msg, ...)
{
va_list argp;
int type;
char* fieldname;
int fieldnamelen;
int datalen;
char* s;
int i;
uint64_t ii;
unsigned char* d;
unsigned char* p;
msg->msglen = 4;
va_start(argp,msg);
type = va_arg(argp, int);
while (type != HMF_NULL) {
msg->msglen++;
fieldname = va_arg(argp,char*);
msg->msglen += strlen(fieldname) + 1 + 4;
switch(type) {
case HMF_STR:
s = va_arg(argp,char*);
msg->msglen += strlen(s);
break;
case HMF_S64:
i = va_arg(argp,int);
ii = i;
while (ii > 0) {
msg->msglen++;
ii >>= 8;
}
break;
case HMF_BIN:
i = va_arg(argp,int);
va_arg(argp,unsigned char*);
msg->msglen += i;
break;
default:
fprintf(stderr,"FATAL ERROR: Unsupported type in htsp_create_message (%d)\n",type);
exit(1);
break;
}
type = va_arg(argp, int);
}
va_end(argp);
msg->msg = malloc(msg->msglen);
p = msg->msg;
put_uint32_be(p,msg->msglen - 4); p += 4;
va_start(argp,msg);
type = va_arg(argp, int);
while (type != HMF_NULL) {
*p++ = type;
fieldname = va_arg(argp,char*);
fieldnamelen = strlen(fieldname);
*p++ = fieldnamelen;
switch(type) {
case HMF_STR:
s = va_arg(argp,char*);
datalen = strlen(s);
put_uint32_be(p,datalen); p += 4;
memcpy(p,fieldname,fieldnamelen); p += fieldnamelen;
memcpy(p,s,datalen); p += datalen;
break;
case HMF_S64:
i = va_arg(argp,int);
ii = i;
datalen = 0;
while (ii > 0) {
datalen++;
ii >>= 8;
}
put_uint32_be(p,datalen); p += 4;
memcpy(p,fieldname,fieldnamelen); p += fieldnamelen;
ii = i;
while (ii > 0) {
*p++ = (ii & 0xff);
ii >>= 8;
}
break;
case HMF_BIN:
datalen = va_arg(argp,int);
d = va_arg(argp,unsigned char*);
put_uint32_be(p,datalen); p += 4;
memcpy(p,fieldname,fieldnamelen); p += fieldnamelen;
memcpy(p,d,datalen); p += datalen;
break;
default:
fprintf(stderr,"FATAL ERROR: Unsupported type in htsp_create_message (%d)\n",type);
exit(1);
break;
}
type = va_arg(argp, int);
}
va_end(argp);
return 0;
}
int htsp_send_message(struct htsp_t* htsp, struct htsp_message_t* msg)
{
int res;
int sent = 0;
while(sent < msg->msglen)
{
res = send(htsp->sock, msg->msg + sent, msg->msglen-sent, 0);
if(res == -1){
perror("Can't send query");
return 1;
}
sent += res;
}
return 0;
}
int safe_recv(int sock, unsigned char* p, int bytesleft)
{
int res;
while (bytesleft) {
res = recv(sock, p, bytesleft, 0);
if (res < 0) {
fprintf(stderr,"Error in recv\n");
return res;
}
p += res;
bytesleft -= res;
}
return 0;
}
int htsp_recv_message(struct htsp_t* htsp, struct htsp_message_t* msg, int timeout)
{
int res;
unsigned char buf[4];
if (timeout) {
struct timeval tv = { 0L, timeout*1000 }; /* timeout in ms */
fd_set fds;
FD_ZERO(&fds);
FD_SET(htsp->sock, &fds);
if (select(htsp->sock + 1, &fds, NULL, NULL, &tv)==0) {
return 1;
}
}
//fprintf(stderr,"Waiting for response...\n");
res = safe_recv(htsp->sock, buf, 4);
if (res < 0) {
fprintf(stderr,"Error in recv - res=%d\n",res);
return 2;
}
msg->msglen = get_uint32_be(buf);
msg->msg = malloc(msg->msglen + 4);
if (msg->msg == NULL) {
fprintf(stderr,"FATAL ERROR - out of memory (tried to allocate %d bytes)\n",msg->msglen + 4);
exit(1);
}
memcpy(msg->msg, buf, 4);
res = safe_recv(htsp->sock, msg->msg+4, msg->msglen);
return 0;
}
int htsp_login_old(struct htsp_t* htsp)
{
struct htsp_message_t msg;
int res;
htsp_create_message(&msg,HMF_STR,"method","hello",
HMF_STR,"clientname","pidvbip",
HMF_S64,"htspversion",1,
HMF_S64,"seq",1,
HMF_NULL);
//fprintf(stderr,"Sending hello message - %d bytes\n",msg.msglen);
if ((res = htsp_send_message(htsp,&msg)) > 0) {
fprintf(stderr,"Could not send message\n");
return 1;
}
htsp_destroy_message(&msg);
res = htsp_recv_message(htsp,&msg,0);
if (res > 0) {
fprintf(stderr,"Error receiving login response\n");
return 1;
}
htsp_destroy_message(&msg);
return 0;
}
int htsp_login(struct htsp_t* htsp) //, int server, char* tvh_user, char* tvh_pass)
{
struct htsp_message_t msg;
int res;
HTSSHA1 *shactx = (HTSSHA1*)malloc(hts_sha1_size);
uint8_t d[20];
unsigned char* chall;
int chall_len = 0,res_access = 0;
htsp_create_message(&msg,HMF_STR,"method","hello",
HMF_STR,"clientname","pidvbip",
HMF_S64,"htspversion",1,
HMF_S64,"seq",1,
HMF_NULL);
//fprintf(stderr,"Sending hello message - %d bytes\n",msg.msglen);
if ((res = htsp_send_message(htsp,&msg)) > 0) {
fprintf(stderr,"Could not send message\n");
return 1;
}
htsp_destroy_message(&msg);
res = htsp_recv_message(htsp,&msg,0);
if (res > 0) {
fprintf(stderr,"Error receiving hello response\n");
return 1;
} else {
htsp_get_string(&msg, "method");
htsp_get_bin(&msg, "challenge", &chall, &chall_len);
}
htsp_destroy_message(&msg);
char *tvh_user = htsp->user;
char *tvh_pass = htsp->password;
if ((tvh_user) && (tvh_pass)) {
// Now authenticate
fprintf(stderr,"Authenticating with user: %s pass: %s\n",tvh_user,tvh_pass);
hts_sha1_init(shactx);
hts_sha1_update(shactx, (const uint8_t *)tvh_pass, strlen(tvh_pass));
hts_sha1_update(shactx, (const uint8_t *)chall, chall_len);
hts_sha1_final(shactx, d);
htsp_create_message(&msg,HMF_STR,"method","authenticate",
HMF_STR,"username",tvh_user,
HMF_BIN,"digest",20,d,
HMF_NULL);
if ((res = htsp_send_message(htsp,&msg)) > 0) {
fprintf(stderr,"Could not send message (authenticate)\n");
return 1;
};
htsp_destroy_message(&msg);
res = htsp_recv_message(htsp,&msg,0);
if (res > 0) {
fprintf(stderr,"Error receiving login response\n");
return 1;
} else {
htsp_get_int(&msg, "noaccess",&res_access);
fprintf(stderr,"Received htsp (login): %d - noaccess %d\n",res,res_access);
if (res_access == 1) {
fprintf(stderr,"Login FAILURE - No access with username and password\n");
return 1;
};
};
htsp_destroy_message(&msg);
}
return 0;
}
char* htsp_get_string(struct htsp_message_t* msg, char* name)
{
unsigned char* buf = msg->msg;
int len = msg->msglen;
int msglen = get_uint32_be(buf); buf += 4; len -= 4;
int matchlen = strlen(name);
char* s;
while (len > 0) {
int type = buf[0]; if (type > 6) { type = 0; }
int namelength = buf[1];
int datalength = get_uint32_be(buf + 2);
buf += 6; len -= 6;
if ((type == HMF_STR) && (namelength==matchlen) && (memcmp(buf,name,matchlen)==0)) {
s = malloc(datalength+1);
memcpy(s,buf + namelength,datalength);
s[datalength]=0;
return s;
}
buf += namelength + datalength;
len -= namelength + datalength;
}
return NULL;
}
int htsp_get_int(struct htsp_message_t* msg, char* name, int32_t* val)
{
unsigned char* buf = msg->msg;
int len = msg->msglen;
int msglen = get_uint32_be(buf); buf += 4; len -= 4;
int matchlen = strlen(name);
while (len > 0) {
int type = buf[0]; if (type > 6) { type = 0; }
int namelength = buf[1];
int datalength = get_uint32_be(buf + 2);
buf += 6; len -= 6;
if ((type == HMF_S64) && (namelength==matchlen) && (memcmp(buf,name,matchlen)==0)) {
buf += namelength + datalength - 1; // We decode backwards, it's little-endian
*val = 0;
while (datalength > 0) {
*val <<= 8;
*val |= *buf--;
datalength--;
}
return 0;
}
buf += namelength + datalength;
len -= namelength + datalength;
}
return 1;
}
int htsp_get_uint(struct htsp_message_t* msg, char* name, uint32_t* val)
{
return htsp_get_int(msg,name,(int32_t*)val);
}
int htsp_get_int64(struct htsp_message_t* msg, char* name, int64_t* val)
{
unsigned char* buf = msg->msg;
int len = msg->msglen;
int msglen = get_uint32_be(buf); buf += 4; len -= 4;
int matchlen = strlen(name);
while (len > 0) {
int type = buf[0]; if (type > 6) { type = 0; }
int namelength = buf[1];
int datalength = get_uint32_be(buf + 2);
buf += 6; len -= 6;
if ((type == HMF_S64) && (namelength==matchlen) && (memcmp(buf,name,matchlen)==0)) {
buf += namelength + datalength - 1; // We decode backwards, it's little-endian
*val = 0;
while (datalength > 0) {
*val <<= 8;
*val |= *buf--;
datalength--;
}
return 0;
}
buf += namelength + datalength;
len -= namelength + datalength;
}
return 1;
}
int htsp_get_bin(struct htsp_message_t* msg, char* name, unsigned char** data,int* size)
{
unsigned char* buf = msg->msg;
int len = msg->msglen;
int msglen = get_uint32_be(buf); buf += 4; len -= 4;
int matchlen = strlen(name);
while (len > 0) {
int type = buf[0]; if (type > 6) { type = 0; }
int namelength = buf[1];
int datalength = get_uint32_be(buf + 2);
buf += 6; len -= 6;
if ((type == HMF_BIN) && (namelength==matchlen) && (memcmp(buf,name,matchlen)==0)) {
*data = buf + namelength;
*size = datalength;
return 0;
}
buf += namelength + datalength;
len -= namelength + datalength;
}
return 1;
}
int htsp_get_list(struct htsp_message_t* msg, char* name, unsigned char** data,int* size)
{
unsigned char* buf = msg->msg;
int len = msg->msglen;
int msglen = get_uint32_be(buf); buf += 4; len -= 4;
int matchlen = strlen(name);
while (len > 0) {
int type = buf[0]; if (type > 6) { type = 0; }
int namelength = buf[1];
int datalength = get_uint32_be(buf + 2);
buf += 6; len -= 6;
if ((type == HMF_LIST) && (namelength==matchlen) && (memcmp(buf,name,matchlen)==0)) {
*data = buf + namelength;
*size = datalength;
return 0;
}
buf += namelength + datalength;
len -= namelength + datalength;
}
return 1;
}
/* Calculate a priority value (higher the better) for a language string.
This is currently hard-coded, but should be user-configurable. */
static int audio_lang_priority(char* lang)
{
if (!lang) return 0;
/* Whitelist */
if (!strcmp(lang,"eng")) return 99;
/* The following are the codes used on Spanish DVB-T for alternative (mostly English) language tracks */
if (!strcmp(lang,"v.o")) return 1;
if (!strcmp(lang,"und")) return 1;
if (!strcmp(lang,"qaa")) return 1;
if (!strcmp(lang,"mul")) return 1;
/* Blacklist */
if (!strcmp(lang,"cat")) return -1;
if (!strcmp(lang,"spa")) return -2;
return 0;
}
int htsp_parse_subscriptionStart(struct htsp_message_t* msg, struct htsp_subscription_t* subscription)
{
unsigned char* list;
int listlen;
int i;
if (htsp_get_list(msg,"streams",&list,&listlen) > 0)
return 1;
unsigned char* buf = list;
subscription->numstreams = 0;
subscription->videostream = -1;
subscription->audiostream = -1;
int len = listlen;
while (len > 0) {
subscription->numstreams++;
int type = buf[0]; if (type > 6) { type = 0; }
int namelength = buf[1];
int datalength = get_uint32_be(buf + 2);
buf += 6 + namelength + datalength;
len -= 6 + namelength + datalength;
}
subscription->streams = malloc(subscription->numstreams * sizeof(struct htsp_stream_t));
len = listlen;
buf = list;
i = 0;
while (len > 0) {
int type = buf[0]; if (type > 6) { type = 0; }
int namelength = buf[1];
int datalength = get_uint32_be(buf + 2);
buf += 6; len -= 6;
struct htsp_message_t tmpmsg;
tmpmsg.msg = buf + namelength - 4;
tmpmsg.msglen = datalength;
htsp_get_int(&tmpmsg,"index",&subscription->streams[i].index);
char* typestr = htsp_get_string(&tmpmsg,"type");
char* lang = htsp_get_string(&tmpmsg,"language");
fprintf(stderr,"%d %s %s\n",subscription->streams[i].index, typestr, lang);
if (typestr==NULL)
return 1;
if (lang)
strncpy(subscription->streams[i].lang,lang,4);
if (strcmp(typestr,"MPEG2VIDEO")==0) {
subscription->streams[i].type = HMF_STREAM_VIDEO;
subscription->streams[i].codec = HMF_VIDEO_CODEC_MPEG2;
subscription->videostream = i;
DEBUGF("Video stream is index %d: MPEG-2\n",subscription->streams[i].index);
} else if (strcmp(typestr,"H264")==0) {
subscription->streams[i].type = HMF_STREAM_VIDEO;
subscription->streams[i].codec = HMF_VIDEO_CODEC_H264;
subscription->videostream = i;
DEBUGF("Video stream is index %d: H264\n",subscription->streams[i].index);
} else if (strcmp(typestr,"MPEG2AUDIO")==0) {
subscription->streams[i].type = HMF_STREAM_AUDIO;
subscription->streams[i].codec = HMF_AUDIO_CODEC_MPEG;
if ((subscription->audiostream == -1) || (audio_lang_priority(lang) > audio_lang_priority(subscription->streams[subscription->audiostream].lang))) {
subscription->audiostream = i;
fprintf(stderr,"Audio stream is index %d: MPEG (i=%d)\n",subscription->streams[i].index,i);
}
} else if (strcmp(typestr,"AAC")==0) {
subscription->streams[i].type = HMF_STREAM_AUDIO;
subscription->streams[i].codec = HMF_AUDIO_CODEC_AAC;
if ((subscription->audiostream == -1) || (audio_lang_priority(lang) > audio_lang_priority(subscription->streams[subscription->audiostream].lang))) {
subscription->audiostream = i;
fprintf(stderr,"Audio stream is index %d: AAC\n",subscription->streams[i].index);
}
} else if (strcmp(typestr,"AC3")==0) {
subscription->streams[i].type = HMF_STREAM_AUDIO;
subscription->streams[i].codec = HMF_AUDIO_CODEC_AC3;
/* AC3 takes precedence over MPEG, if the language is the same or greater priority */
if ((subscription->audiostream == -1) || ((subscription->streams[subscription->audiostream].codec == HMF_AUDIO_CODEC_MPEG) || (audio_lang_priority(lang) >= audio_lang_priority(subscription->streams[subscription->audiostream].lang)))) {
subscription->audiostream = i;
fprintf(stderr,"Audio stream is index %d: A/52\n",subscription->streams[i].index);
}
} else if (strcmp(typestr,"DVBSUB")==0) {
subscription->streams[i].type = HMF_STREAM_SUB;
subscription->streams[i].codec = HMF_SUB_CODEC_DVBSUB;
} else {
subscription->streams[i].type = HMF_UNKNOWN;
subscription->streams[i].codec = HMF_UNKNOWN;
fprintf(stderr,"Warning: Unknown stream type \"%s\"\n",typestr);
}
free(typestr);
if (lang != NULL) free(lang);
buf += namelength + datalength;
len -= namelength + datalength;
i++;
}
return 0;
}
int htsp_send_skip(struct htsp_t* htsp, int time)
{
int res;
struct htsp_message_t msg;
htsp_lock(htsp);
res = htsp_create_message(&msg,HMF_STR,"method","subscriptionSkip",
HMF_S64,"time",time*1000000,
HMF_S64,"subscriptionId",htsp->subscriptionId,
HMF_NULL);
res = htsp_send_message(htsp,&msg);
fprintf(stderr,"Sent subscriptionSkip(%d) message, res=%d\n",time,res);
htsp_unlock(htsp);
htsp_destroy_message(&msg);
return res;
}