Boolean parseRangeHeader(char const* buf, double& rangeStart, double& rangeEnd) {
// First, find "Range:"
while (1) {
if (*buf == '\0') return False; // not found
if (_strncasecmp(buf, "Range: ", 7) == 0) break;
++buf;
}
// Then, run through each of the fields, looking for ones we handle:
char const* fields = buf + 7;
while (*fields == ' ') ++fields;
double start, end;
Locale l("C", LC_NUMERIC);
if (sscanf(fields, "npt = %lf - %lf", &start, &end) == 2) {
rangeStart = start;
rangeEnd = end;
} else if (sscanf(fields, "npt = %lf -", &start) == 1) {
rangeStart = start;
rangeEnd = 0.0;
} else {
return False; // The header is malformed
}
return True;
}
Boolean parsePlayNowHeader(char const* buf) {
// Find "x-playNow:" header, if present
while (1) {
if (*buf == '\0') return False; // not found
if (_strncasecmp(buf, "x-playNow:", 10) == 0) break;
++buf;
}
return True;
}
Boolean parseRangeHeader(char const* buf, double& rangeStart, double& rangeEnd, char*& absStartTime, char*& absEndTime) {
// First, find "Range:"
while (1) {
if (*buf == '\0') return False; // not found
if (_strncasecmp(buf, "Range: ", 7) == 0) break;
++buf;
}
// Then, run through each of the fields, looking for ones we handle:
char const* fields = buf + 7;
while (*fields == ' ') ++fields;
return parseRangeParam(fields, rangeStart, rangeEnd, absStartTime, absEndTime);
}
// A special version of "parseTransportHeader()", used just for parsing the "Transport:" header in an incoming "REGISTER" command:
void parseTransportHeaderForREGISTER(char const* buf,
Boolean &reuseConnection,
Boolean& deliverViaTCP,
char*& proxyURLSuffix) {
// Initialize the result parameters to default values:
reuseConnection = False;
deliverViaTCP = False;
proxyURLSuffix = NULL;
// First, find "Transport:"
while (1) {
if (*buf == '\0') return; // not found
if (*buf == '\r' && *(buf+1) == '\n' && *(buf+2) == '\r') return; // end of the headers => not found
if (_strncasecmp(buf, "Transport:", 10) == 0) break;
++buf;
}
// Then, run through each of the fields, looking for ones we handle:
char const* fields = buf + 10;
while (*fields == ' ') ++fields;
char* field = strDupSize(fields);
while (sscanf(fields, "%[^;\r\n]", field) == 1) {
if (strcmp(field, "reuse_connection") == 0) {
reuseConnection = True;
} else if (_strncasecmp(field, "preferred_delivery_protocol=udp", 31) == 0) {
deliverViaTCP = False;
} else if (_strncasecmp(field, "preferred_delivery_protocol=interleaved", 39) == 0) {
deliverViaTCP = True;
} else if (_strncasecmp(field, "proxy_url_suffix=", 17) == 0) {
delete[] proxyURLSuffix;
proxyURLSuffix = strDup(field+17);
}
fields += strlen(field);
while (*fields == ';' || *fields == ' ' || *fields == '\t') ++fields; // skip over separating ';' chars or whitespace
if (*fields == '\0' || *fields == '\r' || *fields == '\n') break;
}
delete[] field;
}
Boolean parseRangeHeader(char const* buf,
double& rangeStart, double& rangeEnd,
char*& absStartTime, char*& absEndTime,
Boolean& startTimeIsNow) {
// First, find "Range:"
while (1) {
if (*buf == '\0') return False; // not found
if (_strncasecmp(buf, "Range: ", 7) == 0) break;
++buf;
}
char const* fields = buf + 7;
while (*fields == ' ') ++fields;
return parseRangeParam(fields, rangeStart, rangeEnd, absStartTime, absEndTime, startTimeIsNow);
}
static Boolean parseAuthorizationHeader(char const* buf,
char const*& username,
char const*& realm,
char const*& nonce, char const*& uri,
char const*& response) {
// Initialize the result parameters to default values:
username = realm = nonce = uri = response = NULL;
// First, find "Authorization:"
while (1) {
if (*buf == '\0') return False; // not found
if (_strncasecmp(buf, "Authorization: Digest ", 22) == 0) break;
++buf;
}
// Then, run through each of the fields, looking for ones we handle:
char const* fields = buf + 22;
while (*fields == ' ') ++fields;
char* parameter = strDupSize(fields);
char* value = strDupSize(fields);
while (1) {
value[0] = '\0';
if (sscanf(fields, "%[^=]=\"%[^\"]\"", parameter, value) != 2 &&
sscanf(fields, "%[^=]=\"\"", parameter) != 1) {
break;
}
if (strcmp(parameter, "username") == 0) {
username = strDup(value);
} else if (strcmp(parameter, "realm") == 0) {
realm = strDup(value);
} else if (strcmp(parameter, "nonce") == 0) {
nonce = strDup(value);
} else if (strcmp(parameter, "uri") == 0) {
uri = strDup(value);
} else if (strcmp(parameter, "response") == 0) {
response = strDup(value);
}
fields += strlen(parameter) + 2 /*="*/ + strlen(value) + 1 /*"*/;
while (*fields == ',' || *fields == ' ') ++fields;
// skip over any separating ',' and ' ' chars
if (*fields == '\0' || *fields == '\r' || *fields == '\n') break;
}
delete[] parameter; delete[] value;
return True;
}
Boolean SIPClient::parseSIPURLUsernamePassword(char const* url,
char*& username,
char*& password) {
username = password = NULL; // by default
do {
// Parse the URL as "sip:<username>[:<password>]@<whatever>"
char const* prefix = "sip:";
unsigned const prefixLength = 4;
if (_strncasecmp(url, prefix, prefixLength) != 0) break;
// Look for the ':' and '@':
unsigned usernameIndex = prefixLength;
unsigned colonIndex = 0, atIndex = 0;
for (unsigned i = usernameIndex; url[i] != '\0' && url[i] != '/'; ++i) {
if (url[i] == ':' && colonIndex == 0) {
colonIndex = i;
} else if (url[i] == '@') {
atIndex = i;
break; // we're done
}
}
if (atIndex == 0) break; // no '@' found
char* urlCopy = strDup(url);
urlCopy[atIndex] = '\0';
if (colonIndex > 0) {
urlCopy[colonIndex] = '\0';
password = strDup(&urlCopy[colonIndex+1]);
} else {
password = strDup("");
}
username = strDup(&urlCopy[usernameIndex]);
delete[] urlCopy;
return True;
} while (0);
return False;
}
Boolean parseScaleHeader(char const* buf, float& scale) {
// Initialize the result parameter to a default value:
scale = 1.0;
// First, find "Scale:"
while (1) {
if (*buf == '\0') return False; // not found
if (_strncasecmp(buf, "Scale:", 6) == 0) break;
++buf;
}
char const* fields = buf + 6;
while (*fields == ' ') ++fields;
float sc;
if (sscanf(fields, "%f", &sc) == 1) {
scale = sc;
} else {
return False; // The header is malformed
}
return True;
}
Boolean parseSpecifiedStringParam(char const* buf, char *find_str, char *specified_str, Boolean specified_str_len)
{
// First, find "Content-type:"
while (1) {
if (*buf == '\0') return False; // not found
if (_strncasecmp(buf, specified_str, specified_str_len) == 0) break;
++buf;
}
// Then, run through each of the fields, looking for ones we handle:
char const* fields = buf + specified_str_len;
while (*fields == ' ') ++fields;
Boolean i = 0;
while (1) {
if (fields[i] == '\r' && fields[i+1] == '\n'){
find_str[i] = '\0';
return i;
}
find_str[i] = fields[i];
++i;
}
return True;
}
Boolean parseRTSPRequestString(char const* reqStr,
unsigned reqStrSize,
char* resultCmdName,
unsigned resultCmdNameMaxSize,
char* resultURLPreSuffix,
unsigned resultURLPreSuffixMaxSize,
char* resultURLSuffix,
unsigned resultURLSuffixMaxSize,
char* resultCSeq,
unsigned resultCSeqMaxSize,
char* resultSessionIdStr,
unsigned resultSessionIdStrMaxSize,
unsigned& contentLength,
unsigned& resultPinId,
unsigned& resultDisplayId) {
// This parser is currently rather dumb; it should be made smarter #####
// Read everything up to the first space as the command name:
Boolean parseSucceeded = False;
unsigned i;
for (i = 0; i < resultCmdNameMaxSize-1 && i < reqStrSize; ++i) {
char c = reqStr[i];
if (c == ' ' || c == '\t') {
parseSucceeded = True;
break;
}
resultCmdName[i] = c;
}
resultCmdName[i] = '\0';
if (!parseSucceeded) return False;
// Skip over the prefix of any "rtsp://" or "rtsp:/" URL that follows:
unsigned j = i+1;
while (j < reqStrSize && (reqStr[j] == ' ' || reqStr[j] == '\t')) ++j; // skip over any additional white space
for (; (int)j < (int)(reqStrSize-8); ++j) {
if ((reqStr[j] == 'r' || reqStr[j] == 'R')
&& (reqStr[j+1] == 't' || reqStr[j+1] == 'T')
&& (reqStr[j+2] == 's' || reqStr[j+2] == 'S')
&& (reqStr[j+3] == 'p' || reqStr[j+3] == 'P')
&& reqStr[j+4] == ':' && reqStr[j+5] == '/') {
j += 6;
if (reqStr[j] == '/') {
// This is a "rtsp://" URL; skip over the host:port part that follows:
++j;
while (j < reqStrSize && reqStr[j] != '/' && reqStr[j] != ' ') ++j;
} else {
// This is a "rtsp:/" URL; back up to the "/":
--j;
}
i = j;
break;
}
}
// Look for the URL suffix (before the following "RTSP/"):
parseSucceeded = False;
for (unsigned k = i+1; (int)k < (int)(reqStrSize-5); ++k) {
if (reqStr[k] == 'R' && reqStr[k+1] == 'T' &&
reqStr[k+2] == 'S' && reqStr[k+3] == 'P' && reqStr[k+4] == '/') {
while (--k >= i && reqStr[k] == ' ') {} // go back over all spaces before "RTSP/"
unsigned k1 = k;
while (k1 > i && reqStr[k1] != '/') --k1;
// ASSERT: At this point
// i: first space or slash after "host" or "host:port"
// k: last non-space before "RTSP/"
// k1: last slash in the range [i,k]
// The URL suffix comes from [k1+1,k]
// Copy "resultURLSuffix":
unsigned n = 0, k2 = k1+1;
if (i <= k) { // There's a slash after "host" or "host:port"
if (k - k1 + 1 > resultURLSuffixMaxSize) return False; // there's no room
while (k2 <= k) resultURLSuffix[n++] = reqStr[k2++];
}
resultURLSuffix[n] = '\0';
// The URL 'pre-suffix' comes from [i+1,k1-1]
// Copy "resultURLPreSuffix":
n = 0; k2 = i + 1;
if (i <= k) { // There's a slash after "host" or "host:port"
if (k1 - i > resultURLPreSuffixMaxSize) return False; // there's no room
while (k2 <= k1 - 1) resultURLPreSuffix[n++] = reqStr[k2++];
}
resultURLPreSuffix[n] = '\0';
decodeURL(resultURLPreSuffix);
i = k + 7; // to go past " RTSP/"
parseSucceeded = True;
break;
}
}
if (!parseSucceeded) return False;
// Look for "CSeq:" (mandatory, case insensitive), skip whitespace,
// then read everything up to the next \r or \n as 'CSeq':
parseSucceeded = False;
for (j = i; (int)j < (int)(reqStrSize-5); ++j) {
if (_strncasecmp("CSeq:", &reqStr[j], 5) == 0) {
j += 5;
while (j < reqStrSize && (reqStr[j] == ' ' || reqStr[j] == '\t')) ++j;
unsigned n;
for (n = 0; n < resultCSeqMaxSize-1 && j < reqStrSize; ++n,++j) {
char c = reqStr[j];
if (c == '\r' || c == '\n') {
parseSucceeded = True;
break;
}
resultCSeq[n] = c;
}
resultCSeq[n] = '\0';
break;
}
}
if (!parseSucceeded) return False;
// Look for "Session:" (optional, case insensitive), skip whitespace,
// then read everything up to the next \r or \n as 'Session':
resultSessionIdStr[0] = '\0'; // default value (empty string)
for (j = i; (int)j < (int)(reqStrSize-8); ++j) {
if (_strncasecmp("Session:", &reqStr[j], 8) == 0) {
j += 8;
while (j < reqStrSize && (reqStr[j] == ' ' || reqStr[j] == '\t')) ++j;
unsigned n;
for (n = 0; n < resultSessionIdStrMaxSize-1 && j < reqStrSize; ++n,++j) {
char c = reqStr[j];
if (c == '\r' || c == '\n') {
break;
}
resultSessionIdStr[n] = c;
}
resultSessionIdStr[n] = '\0';
break;
}
}
// Also: Look for "Content-Length:" (optional, case insensitive)
contentLength = 0; // default value
for (j = i; (int)j < (int)(reqStrSize-15); ++j) {
if (_strncasecmp("Content-Length:", &(reqStr[j]), 15) == 0) {
j += 15;
while (j < reqStrSize && (reqStr[j] == ' ' || reqStr[j] == '\t')) ++j;
unsigned num;
if (sscanf(&reqStr[j], "%u", &num) == 1) {
contentLength = num;
}
}
}
// ESD: Look for "DisplayId:" (optional, case insensitive)
resultDisplayId = 1; // default value
for (j = i; (int)j < (int)(reqStrSize-10); ++j) {
if (_strncasecmp("DisplayId:", &(reqStr[j]), 10) == 0) {
j += 10;
while (j < reqStrSize && (reqStr[j] == ' ' || reqStr[j] == '\t')) ++j;
unsigned num;
if (sscanf(&reqStr[j], "%u", &num) == 1) {
resultDisplayId = num;
}
}
}
// ESD: Look for "Pin:" (optional, case insensitive)
resultPinId = 0; // default value
for (j = i; (int)j < (int)(reqStrSize-4); ++j) {
if (_strncasecmp("Pin:", &(reqStr[j]), 4) == 0) {
j += 4;
while (j < reqStrSize && (reqStr[j] == ' ' || reqStr[j] == '\t')) ++j;
unsigned num;
if (sscanf(&reqStr[j], "%u", &num) == 1) {
resultPinId = num;
}
}
}
return true;
}
void parseTransportHeader(char const* buf,
StreamingMode& streamingMode,
char*& streamingModeString,
char*& destinationAddressStr,
unsigned char& destinationTTL,
unsigned short& clientRTPPortNum, // if UDP
unsigned short& clientRTCPPortNum, // if UDP
unsigned char& rtpChannelId, // if TCP
unsigned char& rtcpChannelId // if TCP
) {
// Initialize the result parameters to default values:
streamingMode = RTP_UDP;
streamingModeString = NULL;
destinationAddressStr = NULL;
destinationTTL = 255;
clientRTPPortNum = 0;
clientRTCPPortNum = 1;
rtpChannelId = rtcpChannelId = 0xFF;
unsigned short p1, p2;
unsigned ttl, rtpCid, rtcpCid;
// First, find "Transport:"
while (1) {
if (*buf == '\0') return; // not found
if (_strncasecmp(buf, "Transport: ", 11) == 0) break;
++buf;
}
// Then, run through each of the fields, looking for ones we handle:
char const* fields = buf + 11;
char* field = strDupSize(fields);
while (sscanf(fields, "%[^;]", field) == 1) {
if (strcmp(field, "RTP/AVP/TCP") == 0) {
streamingMode = RTP_TCP;
} else if (strcmp(field, "RAW/RAW/UDP") == 0 ||
strcmp(field, "MP2T/H2221/UDP") == 0) {
streamingMode = RAW_UDP;
streamingModeString = strDup(field);
} else if (_strncasecmp(field, "destination=", 12) == 0) {
delete[] destinationAddressStr;
destinationAddressStr = strDup(field+12);
} else if (sscanf(field, "ttl%u", &ttl) == 1) {
destinationTTL = (unsigned char)ttl;
} else if (sscanf(field, "client_port=%hu-%hu", &p1, &p2) == 2) {
clientRTPPortNum = p1;
clientRTCPPortNum = p2;
} else if (sscanf(field, "client_port=%hu", &p1) == 1) {
clientRTPPortNum = p1;
clientRTCPPortNum = streamingMode == RAW_UDP ? 0 : p1 + 1;
} else if (sscanf(field, "interleaved=%u-%u", &rtpCid, &rtcpCid) == 2) {
rtpChannelId = (unsigned char)rtpCid;
rtcpChannelId = (unsigned char)rtcpCid;
}
fields += strlen(field);
while (*fields == ';') ++fields; // skip over separating ';' chars
if (*fields == '\0' || *fields == '\r' || *fields == '\n') break;
}
delete[] field;
}
Boolean SIPClient::parseSIPURL(UsageEnvironment& env, char const* url,
NetAddress& address,
portNumBits& portNum) {
do {
// Parse the URL as "sip:<username>@<address>:<port>/<etc>"
// (with ":<port>" and "/<etc>" optional)
// Also, skip over any "<username>[:<password>]@" preceding <address>
char const* prefix = "sip:";
unsigned const prefixLength = 4;
if (_strncasecmp(url, prefix, prefixLength) != 0) {
env.setResultMsg("URL is not of the form \"", prefix, "\"");
break;
}
unsigned const parseBufferSize = 100;
char parseBuffer[parseBufferSize];
unsigned addressStartIndex = prefixLength;
while (url[addressStartIndex] != '\0'
&& url[addressStartIndex++] != '@') {}
char const* from = &url[addressStartIndex];
// Skip over any "<username>[:<password>]@"
char const* from1 = from;
while (*from1 != '\0' && *from1 != '/') {
if (*from1 == '@') {
from = ++from1;
break;
}
++from1;
}
char* to = &parseBuffer[0];
unsigned i;
for (i = 0; i < parseBufferSize; ++i) {
if (*from == '\0' || *from == ':' || *from == '/') {
// We've completed parsing the address
*to = '\0';
break;
}
*to++ = *from++;
}
if (i == parseBufferSize) {
env.setResultMsg("URL is too long");
break;
}
NetAddressList addresses(parseBuffer);
if (addresses.numAddresses() == 0) {
env.setResultMsg("Failed to find network address for \"",
parseBuffer, "\"");
break;
}
address = *(addresses.firstAddress());
portNum = 5060; // default value
char nextChar = *from;
if (nextChar == ':') {
int portNumInt;
if (sscanf(++from, "%d", &portNumInt) != 1) {
env.setResultMsg("No port number follows ':'");
break;
}
if (portNumInt < 1 || portNumInt > 65535) {
env.setResultMsg("Bad port number");
break;
}
portNum = (portNumBits)portNumInt;
}
return True;
} while (0);
return False;
}
