parse_date.c

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/*
 * $Id$
 *
 * Copyright (c) 2007 iptelorg GmbH
 *
 * 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
 *
 * 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 <string.h>
#include "parse_date.h"
#include "parse_def.h"
#include "parser_f.h"  /* eat_space_end and so on */
#include "../mem/mem.h"

/*
 * Parse Date header field
 */

#define READ(val) \
(*(val + 0) + (*(val + 1) << 8) + (*(val + 2) << 16) + (*(val + 3) << 24))

inline static int char2int (char *p, int *t)
{
        if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9')
                return -1;
        *t = (*p - '0')*10 + *(p + 1) - '0';

        return 0;
}

static int rfc1123totm (char *stime, struct tm *ttm ) {
        char *ptime = stime;
        unsigned int uval;
        int ires;

        uval = READ(ptime);
        ptime+=4;
        switch (uval) {
                /* Sun, */
                case 0x2c6e7553: ttm->tm_wday = 0; break;
                /* Mon, */
                case 0x2c6e6f4d: ttm->tm_wday = 1; break;
                /* Tue, */
                case 0x2c657554: ttm->tm_wday = 2; break;
                /* Wed, */
                case 0x2c646557: ttm->tm_wday = 3; break;
                /* Thu, */
                case 0x2c756854: ttm->tm_wday = 4; break;
                /* Fri, */
                case 0x2c697246: ttm->tm_wday = 5; break;
                /* Sat, */
                case 0x2c746153: ttm->tm_wday = 6; break;
                default: return -2;
        }

        if (*(ptime++)!=' ') return -3;


        if (char2int(ptime,&ttm->tm_mday) || ttm->tm_mday > 31) return -4;
        ptime+=2;

        if (*(ptime++) != ' ') return -5;

        uval = READ(ptime);
        ptime+=4;
        switch (uval) {
                /* Jan, */
                case 0x206e614a: ttm->tm_mon = 0; break;
                /* Feb, */
                case 0x20626546: ttm->tm_mon = 1; break;
                /* Mar, */
                case 0x2072614d: ttm->tm_mon = 2; break;
                /* Apr, */
                case 0x20727041: ttm->tm_mon = 3; break;
                /* May, */
                case 0x2079614d: ttm->tm_mon = 4; break;
                /* Jun, */
                case 0x206e754a: ttm->tm_mon = 5; break;
                /* Jul, */
                case 0x206c754a: ttm->tm_mon = 6; break;
                /* Aug, */
                case 0x20677541: ttm->tm_mon = 7; break;
                /* Sep, */
                case 0x20706553: ttm->tm_mon = 8; break;
                /* Oct, */
                case 0x2074634f: ttm->tm_mon = 9; break;
                /* Nov, */
                case 0x20766f4e: ttm->tm_mon = 10; break;
                /* Dec, */
                case 0x20636544: ttm->tm_mon = 11; break;
                default: return -6;
        }

        if (char2int(ptime,&ires)) return -7;
        ptime+=2;
        if (char2int(ptime,&ttm->tm_year)) return -8;
        ptime+=2;
        ttm->tm_year+=(ires-19)*100;

        if (*(ptime++) != ' ') return -9;

        if (char2int(ptime,&ttm->tm_hour) || ttm->tm_hour > 23) return -10;
        ptime+=2;
        if (*(ptime++) != ':') return -11;

        if (char2int(ptime,&ttm->tm_min) || ttm->tm_min > 59) return -12;
        ptime+=2;
        if (*(ptime++) != ':') return -13;

        if (char2int(ptime,&ttm->tm_sec) || ttm->tm_sec > 59) return -14;
        ptime+=2;

        /* " GMT" */
        uval = READ(ptime);
        if ((uval | 0x20202020) != 0x746d6720) return -15;

        return 0;
}

void parse_date(char *buffer, char *end, struct date_body *db)
{
        db->error=PARSE_ERROR;

        /* check whether enough characters are available */
        if (end - buffer < RFC1123DATELENGTH)
                goto error;

        if (rfc1123totm(buffer,&db->date))
                goto error;

        db->error=PARSE_OK;
        return ;
error:
        LOG(L_ERR,"ERROR: parse_date: parse error\n");
        return ;
}

int parse_date_header(struct sip_msg *msg)
{
        struct date_body* date_b;


        if ( !msg->date && (parse_headers(msg,HDR_DATE_F,0)==-1 || !msg->date) ) {
                LOG(L_ERR,"ERROR:parse_date_header: bad msg or missing DATE header\n");
                goto error;
        }

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

        date_b=pkg_malloc(sizeof(*date_b));
        if (date_b==0){
                LOG(L_ERR, "ERROR:parse_date_header: out of memory\n");
                goto error;
        }
        memset(date_b, 0, sizeof(*date_b));

        parse_date(msg->date->body.s,
                           msg->date->body.s + msg->date->body.len+1,
                           date_b);
        if (date_b->error==PARSE_ERROR){
                free_date(date_b);
                goto error;
        }
        msg->date->parsed=(void*)date_b;

        return 0;
error:
        return -1;
}

void free_date(struct date_body *db)
{
        pkg_free(db);
}