137 lines
3.7 KiB
C
137 lines
3.7 KiB
C
/*
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* $Id$
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*
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* MiniMIME - a library for handling MIME messages
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*
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* Copyright (C) 2004 Jann Fischer <rezine@mistrust.net>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of the contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JANN FISCHER AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JANN FISCHER OR THE VOICES IN HIS HEAD
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/time.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <assert.h>
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#include "mm_internal.h"
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#define MM_DATE_LENGTH 50
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static const char boundary_charset[] =
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"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.=";
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/** @file mm_mimeutil.c
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*
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* This module contains various MIME related utility functions.
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*/
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/** @defgroup mimeutil MIME related utility functions */
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/**
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* Generates an RFC 2822 conform date string
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*
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* @param timezone Whether to include timezone information
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* @returns A pointer to the actual date string
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* @note The pointer returned must be freed some time
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*
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* This function generates an RFC 2822 conform date string to use in message
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* headers. It allocates memory to hold the string and returns a pointer to
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* it. The generated date is in the format (example):
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*
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* Thu, 25 December 2003 16:35:22 +0100 (CET)
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*
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* This function dynamically allocates memory and returns a pointer to it.
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* This memory should be released with free() once not needed anymore.
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*/
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int
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mm_mimeutil_gendate(char **result)
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{
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time_t curtime;
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struct tm *curtm;
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if (result != NULL) {
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curtime = time(NULL);
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curtm = localtime(&curtime);
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if ((*result = (char *) malloc(MM_DATE_LENGTH)) == NULL) {
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return(-1);
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}
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return(strftime(*result, MM_DATE_LENGTH,
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"%a, %d %b %G %T %z (%Z)", curtm));
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} else {
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return(-1);
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}
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}
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int
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mm_mimeutil_genboundary(char *prefix, size_t length, char **result)
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{
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size_t total;
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size_t preflen;
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struct timeval curtm;
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int i;
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int pos;
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total = 0;
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preflen = 0;
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if (result == NULL) {
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return(-1);
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}
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*result = NULL;
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gettimeofday(&curtm, NULL);
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srandom(curtm.tv_usec);
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if (prefix != NULL) {
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total = strlen(prefix);
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preflen = total;
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}
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total += length;
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if ((*result = (char *) xmalloc(total + 1)) == NULL) {
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mm_errno = MM_ERROR_ERRNO;
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return(-1);
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}
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*result = '\0';
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if (prefix != NULL) {
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strlcat(*result, prefix, total);
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}
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for (i = 0; i < length - 1; i++) {
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pos = random() % strlen(boundary_charset);
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*result[i + preflen] = boundary_charset[pos];
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}
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*result[total] = '\0';
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return (0);
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}
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