Zabbix

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** This program 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 Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

#include "zbxmedia.h"

​

#include "zbxstr.h"

#include "zbxcomms.h"

#include "zbxcrypto.h"

#include "zbxalgo.h"

#include "zbxcurl.h"

​

/* number of characters per line when wrapping Base64 data in Email */

#define ZBX_EMAIL_B64_MAXLINE           76

​

/* number of characters per "encoded-word" in RFC-2047 message header */

#define ZBX_EMAIL_B64_MAXWORD_RFC2047       75

​

/* multiple 'encoded-word's should be separated by <CR><LF><SPACE> */

#define ZBX_EMAIL_ENCODED_WORD_SEPARATOR    "\r\n "

​

/* separator for multipart mixed messages */

#define ZBX_MULTIPART_MIXED_BOUNDARY    "MULTIPART-MIXED-BOUNDARY"

​

#define OK_250  "250"

​

/******************************************************************************

 *                                                                            *

 * Purpose: Encode a string into a base64 string as required by rfc2047.      *

 *          Used for encoding e-mail headers.                                 *

 *                                                                            *

 * Parameters: src      - [IN] a null-terminated UTF-8 string to encode       *

 *             p_base64 - [OUT] a pointer to the encoded string               *

 *                                                                            *

 * Comments: Based on the patch submitted by                                  *

 *           Jairo Eduardo Lopez Fuentes Nacarino                             *

 *                                                                            *

 ******************************************************************************/

static void str_base64_encode_rfc2047(const char *src, char **p_base64)

{

    const char  *p0;            /* pointer in src to start encoding from */

    const char  *p1;            /* pointer in src: 1st byte of UTF-8 character */

    size_t      c_len;          /* length of UTF-8 character sequence */

    size_t      p_base64_alloc;     /* allocated memory size for subject */

    size_t      p_base64_offset = 0;    /* offset for writing into subject */

​

    assert(src);

    assert(NULL == *p_base64);      /* do not accept already allocated memory */

​

    p_base64_alloc = ZBX_EMAIL_B64_MAXWORD_RFC2047 + sizeof(ZBX_EMAIL_ENCODED_WORD_SEPARATOR);

    *p_base64 = (char *)zbx_malloc(NULL, p_base64_alloc);

    **p_base64 = '\0';

​