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+/*
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+ * $Id: parse_privacy.c 4720 2008-08-23 10:56:15Z henningw $
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+ *
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+ * Copyright (c) 2006 Juha Heinanen
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+ *
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+ * This file is part of Kamailio, a free SIP server.
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+ *
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+ * Kamailio is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version
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+ *
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+ * Kamailio is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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+ *
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+ * History:
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+ * -------
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+ * 2006-12-18 Introduced parsing of Privacy header (RFC 3323)
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+ */
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+
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+/*!
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+ * \file
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+ * \brief Privacy value parser
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+ * \ingroup parser
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+ */
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+
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+#include <stdlib.h>
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+#include <string.h>
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+#include "../../dprint.h"
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+#include "../../trim.h"
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+#include "parse_privacy.h"
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+#include "../../parser/msg_parser.h"
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+
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+
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+/*!
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+ * Parse a privacy value pointed by start that can be at most max_len long.
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+ * \return length of matched privacy value on success or NULL otherwise
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+ */
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+unsigned int parse_priv_value(char* start, unsigned int max_len,
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+ unsigned int* value)
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+{
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+ unsigned int len;
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+
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+ if (!start || !value) {
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+ LM_ERR("invalid parameter value\n");
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+ return 0;
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+ }
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+
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+ switch (start[0]) {
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+
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+ case 'c':
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+ case 'C':
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+ if(max_len < 8)
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+ return 0;
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+ if (strncasecmp(start, "critical", 8) == 0) {
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+ *value = PRIVACY_CRITICAL;
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+ len = 8;
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+ break;
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+ } else {
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+ return 0;
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+ }
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+
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+ case 'h':
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+ case 'H':
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+ if (max_len < 6)
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+ return 0;
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+ if (strncasecmp(start, "header", 6) == 0) {
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+ *value = PRIVACY_HEADER;
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+ len = 6;
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+ break;
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+ }
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+ if (max_len < 7)
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+ return 0;
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+ if (strncasecmp(start, "history", 7) == 0) {
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+ *value = PRIVACY_HISTORY;
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+ len = 7;
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+ break;
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+ } else {
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+ return 0;
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+ }
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+
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+ case 'i':
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+ case 'I':
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+ if(max_len < 2)
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+ return 0;
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+ if (start[1] == 'd' || start[1] == 'D') {
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+ *value = PRIVACY_ID;
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+ len = 2;
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+ break;
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+ } else {
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+ return 0;
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+ }
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+
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+ case 'n':
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+ case 'N':
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+ if(max_len < 4)
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+ return 0;
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+ if (strncasecmp(start, "none", 4) == 0) {
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+ *value = PRIVACY_NONE;
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+ len = 4;
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+ break;
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+ } else {
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+ return 0;
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+ }
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+
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+ case 's':
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+ case 'S':
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+ if(max_len < 7)
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+ return 0;
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+ if (strncasecmp(start, "session", 7) == 0) {
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+ *value = PRIVACY_SESSION;
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+ len = 7;
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+ break;
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+ } else {
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+ return 0;
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+ }
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+
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+ case 'u':
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+ case 'U':
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+ if(max_len < 4)
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+ return 0;
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+ if (strncasecmp(start, "user", 4) == 0) {
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+ *value = PRIVACY_USER;
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+ len = 4;
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+ break;
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+ } else {
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+ return 0;
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+ }
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+
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+ default:
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+ return 0;
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+ }
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+
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+ if(len < max_len) {
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+ if(start[len] != '\0' && start[len] != ';' && start[len] != ' '
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+ && start[len] != '\t' && start[len] != '\r' && start[len] != '\n')
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+ return 0;
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+ }
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+
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+ return len;
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+}
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+
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+
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+/*!
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+ * This method is used to parse Privacy HF body, which consist of
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+ * comma separated list of priv-values. After parsing, msg->privacy->parsed
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+ * contains enum bits of privacy values defined in parse_privacy.h.
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+ * \return 0 on success and -1 on failure.
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+ */
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+int parse_privacy(struct sip_msg *msg)
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+{
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+ unsigned int val_len, value, values, len;
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+ str next;
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+ char *p, *beyond;
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+
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+ /* maybe the header is already parsed! */
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+ if (msg->privacy && msg->privacy->parsed)
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+ return 0;
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+
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+ /* parse Privacy HF (there should be only one) */
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+ if (!msg->privacy &&
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+ (parse_headers(msg, HDR_PRIVACY_F, 0) == -1 || !msg->privacy)) {
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+ return -1;
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+ }
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+
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+ next.len = msg->privacy->body.len;
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+ next.s = msg->privacy->body.s;
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+
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+ trim_leading(&next);
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+
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+ if (next.len == 0) {
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+ LM_ERR("no values\n");
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+ return -1;
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+ }
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+
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+ values = 0;
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+ p = next.s;
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+ len = next.len;
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+ beyond = p + len;
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+
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+ while (p < beyond) {
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+ if((val_len = parse_priv_value(p, len, &value)) != 0) {
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+ values |= value;
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+ p = p + val_len;
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+ len = len - val_len;
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+ } else {
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+ LM_ERR("invalid privacy value\n");
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+ return -1;
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+ }
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+
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+ while(p < beyond && (*p == ' ' || *p == '\t'
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+ || *p == '\r' || *p == '\n'))
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+ p++;
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+
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+ if(p >= beyond) break;
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+
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+ if (*p == ';') {
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+ p++;
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+ while(p < beyond && (*p == ' ' || *p == '\t'
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+ || *p == '\r' || *p == '\n'))
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+ p++;
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+ if(p >= beyond) {
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+ LM_ERR("no privacy value after comma\n");
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+ return -1;
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+ }
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+ } else {
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+ LM_ERR("semicolon expected\n");
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+ return -1;
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+ }
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+ }
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+
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+ if ((values & PRIVACY_NONE) && (values ^ PRIVACY_NONE)) {
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+ LM_ERR("no other privacy values allowed with 'none'\n");
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+ return -1;
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+ }
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+
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+ msg->privacy->parsed = (void *)(long)values;
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+
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+ return 0;
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+}
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