/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include "sip_parse_uri.h"
#include "sip_msg.h"
#include "sip_miscdefs.h"

/*
 * atoi function from a header
 */
int
sip_atoi(_sip_header_t *sip_header, int *num)
{
	boolean_t	num_found = B_FALSE;

	*num = 0;
	while (sip_header->sip_hdr_current < sip_header->sip_hdr_end) {
		if (isspace(*sip_header->sip_hdr_current)) {
			sip_header->sip_hdr_current++;
			if (num_found)
				break;
		} else if (isdigit(*sip_header->sip_hdr_current)) {
			*num = (*num * 10) +
			    (*sip_header->sip_hdr_current - '0');
			num_found = B_TRUE;
			sip_header->sip_hdr_current++;
		} else {
			break;
		}
	}
	if (!num_found)
		return (EINVAL);
	return (0);
}

/*
 * Find the 'token'
 */
int
sip_find_token(_sip_header_t *sip_header, char token)
{
	while (sip_header->sip_hdr_current < sip_header->sip_hdr_end) {
		if (token != SIP_COMMA &&
		    *sip_header->sip_hdr_current == SIP_COMMA) {
			sip_header->sip_hdr_current--;
			return (1);
		}
		if (*sip_header->sip_hdr_current++ == token) {
			/*
			 * sip_hdr_current points to the char
			 * after the token
			 */
			return (0);
		}
	}
	return (1);
}

/*
 * Find a carriage-return
 */
int
sip_find_cr(_sip_header_t *sip_header)
{
	sip_header->sip_hdr_current = sip_header->sip_hdr_end;
	while (*sip_header->sip_hdr_current-- != '\n') {
		if (sip_header->sip_hdr_current == sip_header->sip_hdr_start)
			return (1);
	}
	return (0);
}

/*
 * Find one of the separator provided, i.e. separator_1st or separator_2nd or
 * separator_3rd.
 */
int
sip_find_separator(_sip_header_t *sip_header, char separator_1st,
    char separator_2nd, char separator_3rd)
{
	assert(separator_1st != (char)NULL || separator_2nd != (char)NULL);
	while (sip_header->sip_hdr_current < sip_header->sip_hdr_end) {
		if (isspace(*sip_header->sip_hdr_current) ||
		    (separator_1st != (char)NULL &&
		    (*sip_header->sip_hdr_current == separator_1st)) ||
		    (separator_2nd != (char)NULL &&
		    (*sip_header->sip_hdr_current == separator_2nd)) ||
		    (separator_3rd != (char)NULL &&
		    (*sip_header->sip_hdr_current == separator_3rd))) {
			return (0);
		}
		/*
		 * If we have escape character, go to the next char
		 */
		if (*sip_header->sip_hdr_current == '\\')
			sip_header->sip_hdr_current++;
		sip_header->sip_hdr_current++;
	}
	return (1);
}

/*
 * Return when we hit a white space
 */
int
sip_find_white_space(_sip_header_t *sip_header)
{
	while (sip_header->sip_hdr_current < sip_header->sip_hdr_end) {
		if (isspace(*sip_header->sip_hdr_current))
			return (0);
		sip_header->sip_hdr_current++;
	}
	return (1);
}

/*
 * Skip to the next non-whitespace
 */
int
sip_skip_white_space(_sip_header_t *sip_header)
{
	while (sip_header->sip_hdr_current < sip_header->sip_hdr_end) {
		if (!isspace(*sip_header->sip_hdr_current))
			return (0);
		sip_header->sip_hdr_current++;
	}
	return (1);
}


/*
 * Skip to the non-white space in the reverse direction
 */
int
sip_reverse_skip_white_space(_sip_header_t *sip_header)
{
	while (sip_header->sip_hdr_current >= sip_header->sip_hdr_start) {
		if (!isspace(*sip_header->sip_hdr_current))
			return (0);
		sip_header->sip_hdr_current--;
	}
	return (1);
}

/*
 * get to the first non space after ':'
 */
int
sip_parse_goto_values(_sip_header_t *sip_header)
{
	if (sip_find_token(sip_header, SIP_HCOLON) !=  0)
		return (1);
	if (sip_skip_white_space(sip_header) != 0)
		return (1);

	return (0);
}

/*
 * Skip the current value.
 */
int
sip_goto_next_value(_sip_header_t *sip_header)
{
	boolean_t	quoted = B_FALSE;

	while (sip_header->sip_hdr_current < sip_header->sip_hdr_end) {
		if (*sip_header->sip_hdr_current == SIP_QUOTE) {
			if (quoted)
				quoted = B_FALSE;
			else
				quoted = B_TRUE;
		} else if (!quoted &&
		    *sip_header->sip_hdr_current == SIP_COMMA) {
			/*
			 * value ends before the COMMA
			 */
			sip_header->sip_hdr_current--;
			return (0);
		}
		sip_header->sip_hdr_current++;
	}
	if (quoted)
		return (1);
	return (0);
}

/*
 * Parse the header into parameter list. Parameters start with a ';'
 */
int
sip_parse_params(_sip_header_t *sip_header, sip_param_t **parsed_list)
{
	sip_param_t	*param = NULL;
	sip_param_t	*new_param;
	char		*tmp_ptr;

	if (parsed_list == NULL)
		return (0);

	*parsed_list = NULL;
	for (;;) {
		boolean_t	quoted_name = B_FALSE;

		/*
		 * First check if there are any params
		 */
		if (sip_skip_white_space(sip_header) != 0)
			return (0);
		if (*sip_header->sip_hdr_current != SIP_SEMI)
			return (0);

		sip_header->sip_hdr_current++;

		new_param = calloc(1, sizeof (sip_param_t));
		if (new_param == NULL)
			return (ENOMEM);

		if (param != NULL)
			param->param_next = new_param;
		else
			*parsed_list = new_param;

		param = new_param;

		/*
		 * Let's get to the start of the param name
		 */
		if (sip_skip_white_space(sip_header) != 0)
			return (EPROTO);
		/*
		 * start of param name
		 */
		tmp_ptr = sip_header->sip_hdr_current;
		param->param_name.sip_str_ptr = tmp_ptr;

		if (sip_find_separator(sip_header, SIP_EQUAL, SIP_SEMI,
		    SIP_COMMA) != 0) {
			param->param_name.sip_str_len =
			    sip_header->sip_hdr_current - tmp_ptr;
			param->param_value.sip_str_ptr = NULL;
			param->param_value.sip_str_len = 0;
			return (0);
		}

		/*
		 * End of param name
		 */
		param->param_name.sip_str_len =
		    sip_header->sip_hdr_current - tmp_ptr;

		if (sip_skip_white_space(sip_header) != 0 ||
		    *sip_header->sip_hdr_current == SIP_COMMA) {
			param->param_value.sip_str_ptr = NULL;
			param->param_value.sip_str_len = 0;
			return (0);
		}
		if (*sip_header->sip_hdr_current == SIP_SEMI) {
			param->param_value.sip_str_ptr = NULL;
			param->param_value.sip_str_len = 0;
			continue;
		}
		assert(*sip_header->sip_hdr_current == SIP_EQUAL);

		/*
		 * We are at EQUAL, lets go beyond that
		 */
		sip_header->sip_hdr_current++;

		if (sip_skip_white_space(sip_header) != 0)
			return (EPROTO);

		if (*sip_header->sip_hdr_current == SIP_QUOTE) {
			sip_header->sip_hdr_current++;
			quoted_name = B_TRUE;
		}

		/*
		 * start of param value
		 */
		param->param_value.sip_str_ptr = sip_header->sip_hdr_current;
		tmp_ptr = sip_header->sip_hdr_current;

		if (quoted_name && sip_find_token(sip_header, SIP_QUOTE) != 0) {
			return (EPROTO);
		} else if (sip_find_separator(sip_header, SIP_SEMI, SIP_COMMA,
		    (char)NULL) != 0) {
			return (EPROTO);
		}
		param->param_value.sip_str_len = sip_header->sip_hdr_current -
		    tmp_ptr;
		if (quoted_name)
			param->param_value.sip_str_len--;
	}
}

/*
 * a header that only has "header_name : " is an empty header
 * ":" must exist
 * sip_hdr_current resets to sip_hdr_start before exit
 */
boolean_t
sip_is_empty_hdr(_sip_header_t *sip_header)
{
	if (sip_find_token(sip_header, SIP_HCOLON) != 0) {
		sip_header->sip_hdr_current = sip_header->sip_hdr_start;
		return (B_FALSE);
	}

	if (sip_skip_white_space(sip_header) == 0) {
		sip_header->sip_hdr_current = sip_header->sip_hdr_start;
		return (B_FALSE);
	}

	sip_header->sip_hdr_current = sip_header->sip_hdr_start;
	return (B_TRUE);
}

/*
 * Parsing an empty header, i.e. only has a ":"
 */
int
sip_parse_hdr_empty(_sip_header_t *hdr, sip_parsed_header_t **phdr)
{
	sip_parsed_header_t	*parsed_header;

	if (hdr == NULL || phdr == NULL)
		return (EINVAL);

	/*
	 * check if already parsed
	 */
	if (hdr->sip_hdr_parsed != NULL) {
		*phdr = hdr->sip_hdr_parsed;
		return (0);
	}

	*phdr = NULL;

	parsed_header = calloc(1, sizeof (sip_parsed_header_t));
	if (parsed_header == NULL)
		return (ENOMEM);
	parsed_header->sip_header = hdr;

	parsed_header->value = NULL;

	*phdr = parsed_header;
	return (0);
}

/*
 * validate uri str and parse uri using uri_parse()
 */
static void
sip_parse_uri_str(sip_str_t *sip_str, sip_hdr_value_t *value)
{
	int		error;

	/*
	 * Parse uri
	 */
	if (sip_str->sip_str_len > 0) {
		value->sip_value_parsed_uri = sip_parse_uri(sip_str, &error);
		if (value->sip_value_parsed_uri == NULL)
			return;
		if (error != 0 ||
		    value->sip_value_parsed_uri->sip_uri_errflags != 0) {
			value->sip_value_state = SIP_VALUE_BAD;
		}
	}
}

/*
 * Some basic common checks before parsing the headers
 */
int
sip_prim_parsers(_sip_header_t *sip_header, sip_parsed_header_t **header)
{
	if (sip_header == NULL || header == NULL)
		return (EINVAL);

	/*
	 * check if already parsed
	 */
	if (sip_header->sip_hdr_parsed != NULL) {
		*header = sip_header->sip_hdr_parsed;
		return (0);
	}
	*header = NULL;

	assert(sip_header->sip_hdr_start == sip_header->sip_hdr_current);

	if (sip_parse_goto_values(sip_header) != 0)
		return (EPROTO);

	return (0);
}

/*
 * Parse SIP/2.0 string
 */
int
sip_get_protocol_version(_sip_header_t *sip_header,
    sip_proto_version_t *sip_proto_version)
{
	if (sip_skip_white_space(sip_header) != 0)
		return (1);

	if (strncasecmp(sip_header->sip_hdr_current, SIP, strlen(SIP)) == 0) {
		sip_proto_version->name.sip_str_ptr =
		    sip_header->sip_hdr_current;
		sip_proto_version->name.sip_str_len = strlen(SIP);

		if (sip_find_token(sip_header, SIP_SLASH) != 0)
			return (1);
		if (sip_skip_white_space(sip_header) != 0)
			return (1);

		sip_proto_version->version.sip_str_ptr =
		    sip_header->sip_hdr_current;
		while (isdigit(*sip_header->sip_hdr_current)) {
			sip_header->sip_hdr_current++;
			if (sip_header->sip_hdr_current >=
			    sip_header->sip_hdr_end) {
				return (1);
			}
		}
		if (*sip_header->sip_hdr_current != SIP_PERIOD)
			return (1);
		sip_header->sip_hdr_current++;

		if (!isdigit(*sip_header->sip_hdr_current))
			return (1);
		while (isdigit(*sip_header->sip_hdr_current)) {
			sip_header->sip_hdr_current++;
			if (sip_header->sip_hdr_current >=
			    sip_header->sip_hdr_end) {
				return (1);
			}
		}

		sip_proto_version->version.sip_str_len =
		    sip_header->sip_hdr_current -
		    sip_proto_version->version.sip_str_ptr;
		return (0);
	}
	return (1);
}

/*
 * parser1 parses hdr format
 *	header_name: val1[; par1=pval1;par2=pval2 ..][, val2[;parlist..] ]
 *	val can be str1/str2 or str
 * headers: Accept, Accept-Encode, Accept-lang, Allow, Content-disp,
 *	    Content-Encode, Content-Lang, In-reply-to,
 *	    Priority, Require, Supported, Unsupported
 *	    Allow-Events, Event, Subscription-State
 */
int
sip_parse_hdr_parser1(_sip_header_t *hdr, sip_parsed_header_t **phdr, char sep)
{
	sip_parsed_header_t	*parsed_header;
	int			ret;
	sip_hdr_value_t		*value = NULL;
	sip_hdr_value_t		*last_value = NULL;

	if ((ret = sip_prim_parsers(hdr, phdr)) != 0)
		return (ret);

	/*
	 * check if previously parsed
	 */
	if (*phdr != NULL) {
		hdr->sip_hdr_parsed = *phdr;
		return (0);
	}

	parsed_header = calloc(1, sizeof (sip_parsed_header_t));
	if (parsed_header == NULL)
		return (ENOMEM);
	parsed_header->sip_parsed_header_version = SIP_PARSED_HEADER_VERSION_1;
	parsed_header->sip_header = hdr;

	while (hdr->sip_hdr_current < hdr->sip_hdr_end) {
		value = calloc(1, sizeof (sip_hdr_value_t));
		if (value == NULL) {
			sip_free_phdr(parsed_header);
			return (ENOMEM);
		}
		if (last_value != NULL)
			last_value->sip_next_value = value;
		else
			parsed_header->value = (sip_value_t *)value;

		value->sip_value_start = hdr->sip_hdr_current;
		value->sip_value_header = parsed_header;

		if (sip_find_separator(hdr, sep, SIP_COMMA, SIP_SEMI) == 0) {
			char	c = *hdr->sip_hdr_current;

			if (isspace(c) && sep == (char)NULL) {
				value->str_val_ptr = value->sip_value_start;
				value->str_val_len = hdr->sip_hdr_current -
				    value->sip_value_start;
				/*
				 * nothing at the end except space
				 */
				if (sip_skip_white_space(hdr) != 0) {
					value->sip_value_end =
					    hdr->sip_hdr_current;
					goto end;
				}
				/*
				 * white space skipped
				 */
				c = *(hdr->sip_hdr_current);
			}

			/*
			 * only one string until COMMA, use sip_str_t
			 */
			if (c == SIP_COMMA) {
				char	*t = hdr->sip_hdr_current;

				hdr->sip_hdr_current--;
				(void) sip_reverse_skip_white_space(hdr);
				value->str_val_ptr = value->sip_value_start;
				value->str_val_len = hdr->sip_hdr_current -
				    value->sip_value_start + 1;
				hdr->sip_hdr_current = t;
				goto get_next_val;
			}

			/*
			 * two strings, use sip_2strs_t
			 */
			if ((sep != (char)NULL) && (c == sep)) {
				value->strs1_val_ptr = value->sip_value_start;
				value->strs1_val_len = hdr->sip_hdr_current -
				    value->sip_value_start;

				value->strs2_val_ptr =
				    (++hdr->sip_hdr_current);
				if (sip_find_separator(hdr, SIP_SEMI, SIP_COMMA,
				    (char)NULL) == 0) {
					char t = *(hdr->sip_hdr_current);
					value->strs2_val_len =
					    hdr->sip_hdr_current -
						value->strs2_val_ptr;
					/*
					 * if COMMA, no param list, get next val
					 * if SEMI, need to set params list
					 */
					if (t == SIP_COMMA)
						goto get_next_val;
				} else { /* the last part */
					value->strs2_val_len =
					    hdr->sip_hdr_current -
						value->strs2_val_ptr;
					value->sip_value_end =
					    hdr->sip_hdr_current;
					goto end;
				}
			} else if (sep != (char)NULL) {
				value->sip_value_state = SIP_VALUE_BAD;
				goto get_next_val;
			}

			/*
			 * c == SEMI, value contains single string
			 * only one string until SEMI, use sip_str_t
			 */
			if (c == SIP_SEMI) {
				char	*t = hdr->sip_hdr_current;

				hdr->sip_hdr_current--;
				/*
				 * get rid of SP at end of value field
				 */
				(void) sip_reverse_skip_white_space(hdr);
				value->str_val_ptr = value->sip_value_start;
				value->str_val_len = hdr->sip_hdr_current -
				    value->str_val_ptr + 1;
				hdr->sip_hdr_current = t;
			}

			/*
			 * if SEMI exists in the value, set params list
			 * two situations, there is or not SLASH before SEMI
			 */
			ret = sip_parse_params(hdr, &value->sip_param_list);
			if (ret == EPROTO) {
				value->sip_value_state = SIP_VALUE_BAD;
			} else if (ret != 0) {
				sip_free_phdr(parsed_header);
				return (ret);
			}
			goto get_next_val;
		} else {
			value->str_val_ptr = value->sip_value_start;
			value->str_val_len = hdr->sip_hdr_current -
			    value->sip_value_start;
			value->sip_value_end = hdr->sip_hdr_current;
			goto end;
		}
get_next_val:
		if (sip_find_token(hdr, SIP_COMMA) != 0) {
			value->sip_value_end = hdr->sip_hdr_current;
			break;
		}
		value->sip_value_end = hdr->sip_hdr_current - 1;
		last_value = value;
		(void) sip_skip_white_space(hdr);
	}

end:
	*phdr = parsed_header;
	hdr->sip_hdr_parsed = *phdr;
	return (0);
}

/*
 * header_name: int
 * headers: Expires, Min-Expires
 */
/* ARGSUSED */
int
sip_parse_hdr_parser2(_sip_header_t *hdr, sip_parsed_header_t **phdr,
    int val_type)
{
	sip_parsed_header_t	*parsed_header;
	int			ret = 0;
	sip_hdr_value_t		*value = NULL;

	if ((ret = sip_prim_parsers(hdr, phdr)) != 0)
		return (ret);

	/*
	 * check if previously parsed
	 */
	if (*phdr != NULL) {
		hdr->sip_hdr_parsed = *phdr;
		return (0);
	}
	parsed_header = calloc(1, sizeof (sip_parsed_header_t));
	if (parsed_header == NULL)
		return (ENOMEM);
	parsed_header->sip_parsed_header_version = SIP_PARSED_HEADER_VERSION_1;
	parsed_header->sip_header = hdr;

	value = calloc(1, sizeof (sip_hdr_value_t));
	if (value == NULL) {
		sip_free_phdr(parsed_header);
		return (ENOMEM);
	}

	parsed_header->value = (sip_value_t *)value;

	value->sip_value_start = hdr->sip_hdr_current;
	value->sip_value_header = parsed_header;

	ret = sip_atoi(hdr, &value->int_val);
	if (ret != 0) {
		value->int_val = 0;
		value->sip_value_state = SIP_VALUE_BAD;
	}

	value->sip_value_end = hdr->sip_hdr_current - 1;

	*phdr = parsed_header;
	hdr->sip_hdr_parsed = *phdr;
	return (0);
}

/*
 * parser3 parses hdr format
 * header_name: <val1>[, <val2>]
 * Alert-Info, Call-Info, Error-Info, reply-to
 */
int
sip_parse_hdr_parser3(_sip_header_t *hdr, sip_parsed_header_t **phdr, int type,
    boolean_t parse_uri)
{
	sip_parsed_header_t	*parsed_header;
	sip_hdr_value_t		*value = NULL;
	sip_hdr_value_t		*last_value = NULL;
	int			ret;

	if ((ret = sip_prim_parsers(hdr, phdr)) != 0)
		return (ret);

	/*
	 * check if previously parsed
	 */
	if (*phdr != NULL) {
		hdr->sip_hdr_parsed = *phdr;
		return (0);
	}
	parsed_header = calloc(1, sizeof (sip_parsed_header_t));
	if (parsed_header == NULL)
		return (ENOMEM);
	parsed_header->sip_parsed_header_version = SIP_PARSED_HEADER_VERSION_1;
	parsed_header->sip_header = hdr;
	while (hdr->sip_hdr_current < hdr->sip_hdr_end) {
		int		r;

		value = calloc(1, sizeof (sip_hdr_value_t));
		if (value == NULL) {
			sip_free_phdr(parsed_header);
			return (ENOMEM);
		}

		if (last_value != NULL)
			last_value->sip_next_value = value;
		else
			parsed_header->value = (sip_value_t *)value;

		value->sip_value_start = hdr->sip_hdr_current;
		value->sip_value_header = parsed_header;

		if (type == SIP_STRS_VAL) {
			if (sip_find_token(hdr, SIP_LAQUOT) == 0) {
				char	*cur;

				/*
				 * record the position after LAQUOT
				 */
				cur = hdr->sip_hdr_current;
				/*
				 * get display name and store in str1
				 */
				hdr->sip_hdr_current = value->sip_value_start;
				if (*(hdr->sip_hdr_current) != SIP_LAQUOT) {
					/*
					 * record start pos of display name
					 */
					char	*tmp = hdr->sip_hdr_current;

					if (*hdr->sip_hdr_current ==
					    SIP_QUOTE) {
						hdr->sip_hdr_current++;
						tmp++;
						if (sip_find_token(hdr,
						    SIP_QUOTE) != 0) {
							value->sip_value_state =
							    SIP_VALUE_BAD;
							goto get_next_val;
						}
						hdr->sip_hdr_current -= 2;
					} else {
						hdr->sip_hdr_current = cur - 2;
						(void)
						    sip_reverse_skip_white_space
						    (hdr);
					}
					value->strs1_val_ptr = tmp;
					value->strs1_val_len =
					    hdr->sip_hdr_current - tmp + 1;
				} else {
					value->strs1_val_ptr = NULL;
					value->strs1_val_len = 0;
				}

				/*
				 * set current to the char after LAQUOT
				 */
				hdr->sip_hdr_current = cur;
				value->strs2_val_ptr = hdr->sip_hdr_current;
				if (sip_find_token(hdr, SIP_RAQUOT)) {
					/*
					 * no RAQUOT
					 */
					value->strs1_val_ptr = NULL;
					value->strs1_val_len = 0;
					value->strs2_val_ptr = NULL;
					value->strs2_val_len = 0;
					value->sip_value_state = SIP_VALUE_BAD;
					goto get_next_val;
				}
				value->strs2_val_len = hdr->sip_hdr_current -
				    value->strs2_val_ptr - 1;
			} else {
				char	*cur;

				/*
				 * No display name - Only URI.
				 */
				value->strs1_val_ptr = NULL;
				value->strs1_val_len = 0;
				cur = value->sip_value_start;
				hdr->sip_hdr_current = cur;
				if (sip_find_separator(hdr, SIP_COMMA,
				    (char)NULL, (char)NULL) != 0) {
					value->strs2_val_ptr = cur;
					value->strs2_val_len =
					    hdr->sip_hdr_current -
					    value->strs2_val_ptr - 1;
				} else if (*hdr->sip_hdr_current == SIP_SP) {
					value->strs2_val_ptr = cur;
					cur = hdr->sip_hdr_current - 1;
					if (sip_skip_white_space(hdr) != 0) {
						value->strs2_val_len = cur -
						    value->strs2_val_ptr - 1;
					} else if (*hdr->sip_hdr_current ==
					    SIP_COMMA) {
						value->strs2_val_len = cur -
						    value->strs2_val_ptr - 1;
					} else {
						value->sip_value_state =
						    SIP_VALUE_BAD;
						goto get_next_val;
					}
				} else {
					value->strs2_val_ptr = cur;
					value->strs2_val_len =
					    hdr->sip_hdr_current -
					    value->strs2_val_ptr;
				}
			}
			if (parse_uri)
				sip_parse_uri_str(&value->strs_s2, value);
		}

		if (type == SIP_STR_VAL) {
			/*
			 * alert-info, error-info, call-info
			 */
			if (sip_find_token(hdr, SIP_LAQUOT) == 0) {
				value->str_val_ptr = hdr->sip_hdr_current;
				if (sip_find_token(hdr, SIP_RAQUOT) == 0) {
					value->str_val_len =
					    hdr->sip_hdr_current -
						value->str_val_ptr - 1;
				} else {
					value->str_val_ptr = NULL;
					value->str_val_len = 0;
					value->sip_value_state = SIP_VALUE_BAD;
					goto get_next_val;
				}
				hdr->sip_hdr_current--;
			} else {
				value->str_val_ptr = NULL;
				value->str_val_len = 0;
				value->sip_value_state = SIP_VALUE_BAD;
				goto get_next_val;
			}
			if (parse_uri)
				sip_parse_uri_str(&value->str_val, value);
		}

		r = sip_find_separator(hdr, SIP_COMMA, SIP_SEMI, (char)NULL);
		if (r != 0) {
			value->sip_value_end = hdr->sip_hdr_current;
			goto end;
		}
		if (*hdr->sip_hdr_current == SIP_SEMI) {
			(void) sip_parse_params(hdr,
			    &(value->sip_param_list));
			goto get_next_val;
		}

		if (*hdr->sip_hdr_current == SIP_COMMA) {
			hdr->sip_hdr_current--;
			goto get_next_val;
		}
get_next_val:
		if (sip_find_token(hdr, SIP_COMMA) != 0) {
			value->sip_value_end = hdr->sip_hdr_current;
			break;
		}
		value->sip_value_end = hdr->sip_hdr_current - 1;
		last_value = value;
		(void) sip_skip_white_space(hdr);
	}

end:
	*phdr = parsed_header;
	hdr->sip_hdr_parsed = *phdr;
	return (0);
}

/*
 * parser4 parses hdr format, the whole field is one single str
 * header: Subject, MIME-Version, Organization, Server, User-Agent
 */
int
sip_parse_hdr_parser4(_sip_header_t *hdr, sip_parsed_header_t **phdr)
{
	sip_parsed_header_t	*parsed_header;
	sip_hdr_value_t		*value = NULL;
	int			ret;

	if ((ret = sip_prim_parsers(hdr, phdr)) != 0)
		return (ret);

	/*
	 * check if previously parsed
	 */
	if (*phdr != NULL) {
		hdr->sip_hdr_parsed = *phdr;
		return (0);
	}
	parsed_header = calloc(1, sizeof (sip_parsed_header_t));
	if (parsed_header == NULL)
		return (ENOMEM);
	parsed_header->sip_parsed_header_version = SIP_PARSED_HEADER_VERSION_1;
	parsed_header->sip_header = hdr;

	value = calloc(1, sizeof (sip_hdr_value_t));
	if (value == NULL) {
		sip_free_phdr(parsed_header);
		return (ENOMEM);
	}

	parsed_header->value = (sip_value_t *)value;

	value->sip_value_start = hdr->sip_hdr_current;
	value->sip_value_header = parsed_header;

	value->str_val_ptr = hdr->sip_hdr_current;
	/*
	 * get rid of CRLF at end
	 */
	value->str_val_len = hdr->sip_hdr_end - value->str_val_ptr - 2;
	value->sip_value_end = hdr->sip_hdr_end;

	*phdr = parsed_header;
	hdr->sip_hdr_parsed = *phdr;
	return (0);
}

int
sip_parse_hdr_parser5(_sip_header_t *hdr, sip_parsed_header_t **phdr,
    boolean_t parse_uri)
{
	sip_parsed_header_t	*parsed_header;
	sip_hdr_value_t		*value = NULL;
	sip_param_t		*tmp_param;
	boolean_t		first_param = B_TRUE;
	int			ret;

	if ((ret = sip_prim_parsers(hdr, phdr)) != 0)
		return (ret);

	/*
	 * check if previously parsed
	 */
	if (*phdr != NULL) {
		hdr->sip_hdr_parsed = *phdr;
		return (0);
	}
	parsed_header = calloc(1, sizeof (sip_parsed_header_t));
	if (parsed_header == NULL)
		return (ENOMEM);
	parsed_header->sip_parsed_header_version = SIP_PARSED_HEADER_VERSION_1;
	parsed_header->sip_header = hdr;

	value = calloc(1, sizeof (sip_hdr_value_t));
	if (value == NULL) {
		sip_free_phdr(parsed_header);
		return (ENOMEM);
	}

	parsed_header->value = (sip_value_t *)value;

	value->sip_value_start = hdr->sip_hdr_current;
	value->auth_scheme_ptr = value->sip_value_start;
	value->sip_value_header = parsed_header;
	/*
	 * get auth_scheme
	 */
	if (sip_find_white_space(hdr)) {
		value->sip_value_state = SIP_VALUE_BAD;
		return (EINVAL);
	}
	value->auth_scheme_len = hdr->sip_hdr_current - value->auth_scheme_ptr;

	tmp_param = value->auth_param;

	/*
	 * parse auth_param
	 */
	for (;;) {
		char		*tmp_cur;
		boolean_t	quoted_name = B_FALSE;
		char		quoted_char = (char)0;
		sip_param_t	*new_param;
		boolean_t	pval_is_uri = B_FALSE;

		if (sip_skip_white_space(hdr) != 0) {
			value->sip_value_state = SIP_VALUE_BAD;
			return (EPROTO);
		}
		tmp_cur = hdr->sip_hdr_current;

		new_param = calloc(1, sizeof (sip_param_t));
		if (new_param == NULL)
			return (ENOMEM);

		if (first_param == B_FALSE)
			tmp_param->param_next = new_param;
		else
			value->auth_param = new_param;

		tmp_param = new_param;
		tmp_param->param_name.sip_str_ptr = tmp_cur;

		if (sip_find_separator(hdr, SIP_EQUAL, SIP_COMMA, (char)NULL) !=
		    0) {
			tmp_param->param_name.sip_str_len =
			    hdr->sip_hdr_current - tmp_cur;
			tmp_param->param_value.sip_str_ptr = NULL;
			tmp_param->param_value.sip_str_len = 0;
			value->sip_value_end = hdr->sip_hdr_current;
			goto end;
		}

		/*
		 * End of param name
		 */
		tmp_param->param_name.sip_str_len = hdr->sip_hdr_current -
		    tmp_cur;

		if (sip_skip_white_space(hdr) != 0 ||
		    *hdr->sip_hdr_current == SIP_COMMA) {
			tmp_param->param_value.sip_str_ptr = NULL;
			tmp_param->param_value.sip_str_len = 0;
			continue;
		}

		/*
		 * We are at EQUAL
		 */
		hdr->sip_hdr_current++;

		if (sip_skip_white_space(hdr) != 0) {
			value->sip_value_state = SIP_VALUE_BAD;
			free(tmp_param);
			return (EPROTO);
		}

		if (*hdr->sip_hdr_current == SIP_QUOTE ||
		    *hdr->sip_hdr_current == SIP_LAQUOT) {
			if (*hdr->sip_hdr_current == SIP_QUOTE)
				quoted_char = SIP_QUOTE;
			else {
				quoted_char = SIP_RAQUOT;
				pval_is_uri = B_TRUE;
			}
			hdr->sip_hdr_current++;
			quoted_name = B_TRUE;
		}

		/*
		 * start of param value
		 */
		tmp_cur = hdr->sip_hdr_current;
		tmp_param->param_value.sip_str_ptr = tmp_cur;
		if (quoted_name) {
			if (sip_find_token(hdr, quoted_char) != 0) {
				value->sip_value_state = SIP_VALUE_BAD;
				free(tmp_param);
				return (EPROTO);
			}
			tmp_param->param_value.sip_str_len =
			    hdr->sip_hdr_current - tmp_cur - 1;
		}

		if (sip_find_token(hdr, SIP_COMMA) != 0) {
			value->sip_value_end = hdr->sip_hdr_current;
			goto end;
		} else {
			if (!quoted_name) {
				char *t = hdr->sip_hdr_current;
				hdr->sip_hdr_current--;
				(void) sip_reverse_skip_white_space(hdr);
				tmp_param->param_value.sip_str_len =
				    hdr->sip_hdr_current - tmp_cur;
				hdr->sip_hdr_current = t;
			}
		}

		if (first_param == B_TRUE)
			first_param = B_FALSE;

		/*
		 * Parse uri
		 */
		if (pval_is_uri && parse_uri)
			sip_parse_uri_str(&tmp_param->param_value, value);

	}

end:
	*phdr = parsed_header;
	hdr->sip_hdr_parsed = *phdr;
	return (0);
}

/*
 * Return the URI in the request startline
 */
static int
_sip_get_request_uri(_sip_header_t *sip_header, sip_message_type_t *msg_info)
{
	int	size = 0;
	char	*start_ptr;

	if (sip_skip_white_space(sip_header) != 0)
		return (EINVAL);
	start_ptr = sip_header->sip_hdr_current;

	while (!isspace(*sip_header->sip_hdr_current)) {
		if (sip_header->sip_hdr_current >= sip_header->sip_hdr_end)
			return (EINVAL);
		sip_header->sip_hdr_current++;
	}

	size = sip_header->sip_hdr_current - start_ptr;

	msg_info->U.sip_request.sip_request_uri.sip_str_ptr = start_ptr;
	msg_info->U.sip_request.sip_request_uri.sip_str_len = size;
	if (size > 0) {	/* Parse uri */
		int		error;

		msg_info->U.sip_request.sip_parse_uri = sip_parse_uri(
		    &msg_info->U.sip_request.sip_request_uri, &error);
		if (msg_info->U.sip_request.sip_parse_uri == NULL)
			return (error);
	}
	return (0);
}

/*
 * Parse the start line into request/response
 */
int
sip_parse_first_line(_sip_header_t *sip_header, sip_message_type_t **msg_info)
{
	sip_message_type_t	*sip_msg_info;
	boolean_t		sip_is_request = B_TRUE;
	int			ret;

	if (sip_header == NULL || msg_info == NULL)
		return (EINVAL);

	if (sip_skip_white_space(sip_header) != 0)
		return (EPROTO);

	/*
	 * There is nothing, return
	 */
	if (sip_header->sip_hdr_current + strlen(SIP_VERSION) >=
	    sip_header->sip_hdr_end) {
		return (EPROTO);
	}
#ifdef	__solaris__
	assert(mutex_held(&sip_header->sip_hdr_sipmsg->sip_msg_mutex));
#endif
	sip_msg_info = malloc(sizeof (sip_message_type_t));
	if (sip_msg_info == NULL)
		return (ENOMEM);

	/*
	 * let's see if it's a request or a response
	 */
	ret = sip_get_protocol_version(sip_header,
	    &sip_msg_info->sip_proto_version);
	if (ret == 0) {
		sip_is_request = B_FALSE;
	} else if (ret == 2) {
		free(sip_msg_info);
		return (EPROTO);
	}

	if (sip_skip_white_space(sip_header) != 0) {
		free(sip_msg_info);
		return (EPROTO);
	}

	if (!sip_is_request) {
		/*
		 * check for status code.
		 */
		if (sip_skip_white_space(sip_header) != 0) {
			free(sip_msg_info);
			return (EPROTO);
		}
		if (sip_header->sip_hdr_current + SIP_SIZE_OF_STATUS_CODE >=
		    sip_header->sip_hdr_end) {
			free(sip_msg_info);
			return (EPROTO);
		}

		if (sip_atoi(sip_header,
		    &sip_msg_info->U.sip_response.sip_response_code)) {
			free(sip_msg_info);
			return (EPROTO);
		}

		if (sip_msg_info->U.sip_response.sip_response_code < 100 ||
		    sip_msg_info->U.sip_response.sip_response_code > 700) {
			free(sip_msg_info);
			return (EPROTO);
		}

		/*
		 * get reason phrase.
		 */
		if (sip_skip_white_space(sip_header) != 0) {
			sip_msg_info->sip_resp_phrase_len = 0;
			sip_msg_info->sip_resp_phrase_ptr = NULL;
		} else {
			sip_msg_info->sip_resp_phrase_ptr =
			    sip_header->sip_hdr_current;
			if (sip_find_cr(sip_header) != 0) {
				free(sip_msg_info);
				return (EPROTO);
			}
			sip_msg_info->sip_resp_phrase_len =
			    sip_header->sip_hdr_current -
			    sip_msg_info->sip_resp_phrase_ptr;
		}
		sip_msg_info->is_request = B_FALSE;
	} else {
		int i;
		/*
		 * It's a request.
		 */
		sip_msg_info->is_request = B_TRUE;
		for (i = 1; i < MAX_SIP_METHODS; i++) {
			if (strncmp(sip_methods[i].name,
			    sip_header->sip_hdr_current,
			    sip_methods[i].len) == 0) {
				sip_msg_info->sip_req_method = i;
				sip_header->sip_hdr_current +=
				    sip_methods[i].len;
				if (!isspace(*sip_header->sip_hdr_current++) ||
				    !isalpha(*sip_header->sip_hdr_current)) {
					free(sip_msg_info);
					return (EPROTO);
				}

				if ((ret = _sip_get_request_uri(sip_header,
				    sip_msg_info)) != 0) {
					free(sip_msg_info);
					return (ret);
				}

				/*
				 * Get SIP version
				 */
				ret = sip_get_protocol_version(sip_header,
				    &sip_msg_info->sip_proto_version);
				if (ret != 0) {
					free(sip_msg_info);
					return (EPROTO);
				}
				goto done;
			}
		}
		free(sip_msg_info);
		return (EPROTO);
	}
done:
	sip_msg_info->sip_next = *msg_info;
	*msg_info = sip_msg_info;
	return (0);
}