parse_privacy.c

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/*
 * $Id: parse_privacy.c 4720 2008-08-23 10:56:15Z henningw $
 *
 * Copyright (c) 2006 Juha Heinanen
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio 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
 *
 * Kamailio 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
 *
 * History:
 * -------
 * 2006-12-18 Introduced parsing of Privacy header (RFC 3323)
 */

#include <stdlib.h>
#include <string.h>
#include "../../dprint.h"
#include "../../trim.h"
#include "parse_privacy.h"
#include "../../parser/msg_parser.h"


unsigned int parse_priv_value(char* start, unsigned int max_len,
                              unsigned int* value)
{
    unsigned int len;

    if (!start || !value) {
        LM_ERR("invalid parameter value\n");
        return 0;
    }

    switch (start[0]) {

    case 'c':
    case 'C':
        if(max_len < 8)
            return 0;
        if (strncasecmp(start, "critical", 8) == 0) {
            *value = PRIVACY_CRITICAL;
            len = 8;
            break;
        } else {
            return 0;
        }

    case 'h':
    case 'H':
        if (max_len < 6)
            return 0;
        if (strncasecmp(start, "header", 6) == 0) {
            *value = PRIVACY_HEADER;
            len = 6;
            break;
        }
        if (max_len < 7)
            return 0;
        if (strncasecmp(start, "history", 7) == 0) {
            *value = PRIVACY_HISTORY;
            len = 7;
            break;
        } else {
            return 0;
        }

    case 'i':
    case 'I':
        if(max_len < 2)
            return 0;
        if (start[1] == 'd' || start[1] == 'D') {
            *value = PRIVACY_ID;
            len = 2;
            break;
        } else {
            return 0;
        }

    case 'n':
    case 'N':
        if(max_len < 4)
            return 0;
        if (strncasecmp(start, "none", 4) == 0) {
            *value = PRIVACY_NONE;
            len = 4;
            break;
        } else {
            return 0;
        }

    case 's':
    case 'S':
        if(max_len < 7)
            return 0;
        if (strncasecmp(start, "session", 7) == 0) {
            *value = PRIVACY_SESSION;
            len = 7;
            break;
        } else {
            return 0;
        }

    case 'u':
    case 'U':
        if(max_len < 4)
            return 0;
        if (strncasecmp(start, "user", 4) == 0) {
            *value = PRIVACY_USER;
            len = 4;
            break;
        } else {
            return 0;
        }

    default:
        return 0;
    }

    if(len < max_len) {
        if(start[len] != '\0' && start[len] != ';' && start[len] != ' '
           && start[len] != '\t' && start[len] != '\r' && start[len] != '\n')
            return 0;
    }

    return len;
}


int parse_privacy(struct sip_msg *msg)
{
    unsigned int val_len, value, values, len;
    str next;
    char *p, *beyond;

    /* maybe the header is already parsed! */
    if (msg->privacy && msg->privacy->parsed)
        return 0;

    /* parse Privacy HF (there should be only one) */
    if (!msg->privacy &&
        (parse_headers(msg, HDR_PRIVACY_F, 0) == -1 || !msg->privacy)) {
        return -1;
    }

    next.len = msg->privacy->body.len;
    next.s = msg->privacy->body.s;

    trim_leading(&next);

    if (next.len == 0) {
        LM_ERR("no values\n");
        return -1;
    }

    values = 0;
    p = next.s;
    len = next.len;
    beyond = p + len;

    while (p < beyond) {
        if((val_len = parse_priv_value(p, len, &value)) != 0) {
            values |= value;
            p = p + val_len;
            len = len - val_len;
        } else {
            LM_ERR("invalid privacy value\n");
            return -1;
        }

        while(p < beyond && (*p == ' ' || *p == '\t'
                             || *p == '\r' || *p == '\n'))
            p++;

        if(p >= beyond) break;

        if (*p == ';') {
            p++;
            while(p < beyond && (*p == ' ' || *p == '\t'
                                 || *p == '\r' || *p == '\n'))
                p++;
            if(p >= beyond) {
                LM_ERR("no privacy value after comma\n");
                return -1;
            }           
        } else {
            LM_ERR("semicolon expected\n");
            return -1;
        }
    }

    if ((values & PRIVACY_NONE) && (values ^ PRIVACY_NONE)) {
        LM_ERR("no other privacy values allowed with 'none'\n");
        return -1;
    }

    msg->privacy->parsed = (void *)(long)values;

    return 0;
}