parser/parse_methods.c
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 /*
  * $Id$
  *
  * Copyright (c) 2004 Juha Heinanen
  *
  * This file is part of ser, a free SIP server.
  *
  * ser 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
  *
  * For a license to use the ser software under conditions
  * other than those described here, or to purchase support for this
  * software, please contact iptel.org by e-mail at the following addresses:
  *    info@iptel.org
  *
  * ser 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
 #include <strings.h>
 #include "../dprint.h"
 #include "../trim.h"
 #include "parse_methods.h"
 
 
 /*
  * Check if argument is valid RFC3261 token character.
  */
 static int token_char(char _c)
 {
  	return 	(_c >= 65 && _c <= 90) ||        /* upper alpha */
  		(_c >= 97 && _c <= 122) ||       /* lower aplha */
  		(_c >= 48 && _c <= 57) ||        /* digits */
  		(_c == '-') || (_c == '.') || (_c == '!') || (_c == '%') ||
  		(_c == '*') || (_c == '_') || (_c == '+') || (_c == '`') ||
  		(_c == '\'') || (_c == '~') || (_c == '+') || (_c == '`');
  }
  
  
  /*
   * Parse a method pointed by _next, assign its enum bit to _method, and update
   * _next past the method. Returns 1 if parse succeeded and 0 otherwise.
   */
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 int parse_method(str* _next, enum request_method* _method) 
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  {
 	 if (!_next || !_method) {
 		 LOG(L_ERR, "parse_method: Invalid parameter value\n");
 		 return 0;
 	 }
 	 
 	 if (!_next->len || !_next->s) {
 		 DBG("parse_method: No input\n");
 		 return 1;
 	 }
 
 	 switch ((_next->s)[0]) {
 	 case 'A':
 	 case 'a':
 		 if ((_next->len > 2) && !strncasecmp(_next->s + 1, "ck", 2)) {
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  			*_method = METHOD_ACK;
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  			_next->len -= 3;
  			_next->s += 3;
  			return 1;
  		} else {
  			goto unknown;
  		}
 
  	case 'B':
  	case 'b':
  		if ((_next->len > 2) && !strncasecmp(_next->s + 1, "ye", 2)) {
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  			*_method = METHOD_BYE;
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  			_next->len -= 3;
  			_next->s += 3;
  			return 1;
  		} else {
  			goto unknown;
  		}
 
  	case 'C':
  	case 'c':
  		if ((_next->len > 5) && !strncasecmp(_next->s + 1, "ancel", 5)) {
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  			*_method = METHOD_CANCEL;
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  			_next->len -= 6;
  			_next->s += 6;
  			return 1;
  		} else {
  			goto unknown;
  		}
 
  	case 'I':
  	case 'i':
  		if ((_next->len > 3) &&
  		    ((*(_next->s + 1) == 'N') || (*(_next->s + 1) == 'n'))) {
  			if (!strncasecmp(_next->s + 2, "fo", 2)) {
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  				*_method = METHOD_INFO;
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  				_next->len -= 4;
  				_next->s += 4;
  				return 1;
  			}
 
  			if ((_next->len > 5) && !strncasecmp(_next->s + 2, "vite", 4)) {
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  				*_method = METHOD_INVITE;
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  				_next->len -= 6;
  				_next->s += 6;
  				return 1;
  			}
  		}
  		goto unknown;
 
  	case 'M':
  	case 'm':
  		if ((_next->len > 6) && !strncasecmp(_next->s + 1, "essage", 6)) {
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  			*_method = METHOD_MESSAGE;
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  			_next->len -= 7;
  			_next->s += 7;
  			return 1;
  		} else {
  			goto unknown;
  		}
 
  	case 'N':
  	case 'n':
  		if ((_next->len > 5) && !strncasecmp(_next->s + 1, "otify", 5)) {
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  			*_method = METHOD_NOTIFY;
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  			_next->len -= 6;
  			_next->s += 6;
  			return 1;
  		} else {
  			goto unknown;
  		}
 
  	case 'O':
  	case 'o':
  		if ((_next->len > 6) && !strncasecmp(_next->s + 1, "ptions", 6)) {
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  			*_method = METHOD_OPTIONS;
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  			_next->len -= 7;
  			_next->s += 7;
  			return 1;
  		} else {
  			goto unknown;
  		}
 
  	case 'P':
  	case 'p':
  		if ((_next->len > 4) && !strncasecmp(_next->s + 1, "rack", 4)) {
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  			*_method = METHOD_PRACK;
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  			_next->len -= 5;
  			_next->s += 5;
  			return 1;
  		} else {
  			goto unknown;
  		}
 
  	case 'R':
  	case 'r':
  		if ((_next->len > 4) &&
  		    ((*(_next->s + 1) == 'E') || (*(_next->s + 1) == 'e'))) {
  			if (!strncasecmp(_next->s + 2, "fer", 3)) {
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  				*_method = METHOD_REFER;
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  				_next->len -= 5;
  				_next->s += 5;
  				return 1;
  			}
 
  			if ((_next->len > 7) && !strncasecmp(_next->s + 2, "gister", 6)) {
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  				*_method = METHOD_REGISTER;
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  				_next->len -= 8;
  				_next->s += 8;
  				return 1;
  			}
  		}
  		goto unknown;
 
  	case 'S':
  	case 's':
  		if ((_next->len > 8) && !strncasecmp(_next->s + 1, "ubscribe", 8)) {
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  			*_method = METHOD_SUBSCRIBE;
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  			_next->len -= 9;
  			_next->s += 9;
  			return 1;
  		} else {
  			goto unknown;
  		}
 
  	case 'U':
  	case 'u':
  		if ((_next->len > 5) && !strncasecmp(_next->s + 1, "pdate", 5)) {
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  			*_method = METHOD_UPDATE;
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  			_next->len -= 6;
  			_next->s += 6;
  			return 1;
  		} else {
  			goto unknown;
  		}
 
  	default:
  		goto unknown;
  	}
  
  unknown:
  	if (token_char(*(_next->s))) {
  		do { 
  			_next->s++;
  			_next->len--;
  		} while (_next->len && token_char(*(_next->s)));
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  		*_method = METHOD_OTHER;
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  		return 1;
  	} else {
  		return 0;
  	}
  }
  
  
  /* 
   * Parse comma separated list of methods pointed by _body and assign their
   * enum bits to _methods.  Returns 1 on success and 0 on failure.
   */
  int parse_methods(str* _body, unsigned int* _methods)
  {
  	str next;
  	unsigned int method;
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 	method=0; /* fixes silly gcc 4.x warning */
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 	if (!_body || !_methods) {
 		LOG(L_ERR, "parse_methods: Invalid parameter value\n");
 		return 0;
 	}
 
 	next.len = _body->len;
 	next.s = _body->s;
  
  	trim_leading(&next);
  
  	if (next.len == 0) {
  		LOG(L_ERR, "ERROR: parse_methods: Empty body\n");
  		return 0;
  	}
 
   	*_methods = 0;
  
  	while (1) {
  		if (parse_method(&next, &method)) {
  			*_methods |= method;
  		} else {
  			LOG(L_ERR, "ERROR: parse_methods: Invalid method\n");
  			return 0;
  		}
 		
  		trim_leading(&next);
  		if (next.len) {
  			if (next.s[0] == ',') {
  				next.len--;
  				next.s++;
  				trim_leading(&next);
  				if (next.len == 0) {
  					LOG(L_ERR, "ERROR: parse_methods: Method expected\n");
  					return 0;
  				}
  			} else {
  				LOG(L_ERR, "ERROR: parse_methods: Comma expected\n");
  				return 0;
  			}
  		} else {
  			break;
  		}
  	}
 
  	return 1;
  }