static char* comms_get_xml_b64_value (const char* tag, const char* val)
{
char data_b64[ZBX_MAX_B64_LEN];
data_b64[0] = '\0';
str_base64_encode(val, data_b64, (int)strlen(val));
return zbx_strdcatf(NULL, "<%s>%s</%s>", tag, data_b64, tag);
}
/******************************************************************************
* *
* Function: str_base64_encode_rfc2047 *
* *
* 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 = zbx_malloc(NULL, p_base64_alloc);
**p_base64 = '\0';
for (p0 = src; '\0' != *p0; p0 = p1)
{
/* Max length of line is 76 characters (without line separator). */
/* Max length of "encoded-word" is 75 characters (without word separator). */
/* 3 characters are taken by word separator "<CR><LF><Space>" which also includes the line separator. */
/* 12 characters are taken by header "=?UTF-8?B?" and trailer "?=". */
/* So, one "encoded-word" can hold up to 63 characters of Base64-encoded string. */
/* Encoding 45 bytes produces a 61 byte long Base64-encoded string which meets the limit. */
/* Encoding 46 bytes produces a 65 byte long Base64-encoded string which exceeds the limit. */
for (p1 = p0, c_len = 0; '\0' != *p1; p1 += c_len)
{
/* an invalid UTF-8 character or length of a string more than 45 bytes */
if (0 == (c_len = zbx_utf8_char_len(p1)) || 45 < p1 - p0 + c_len)
break;
}
if (0 < p1 - p0)
{
/* 12 characters are taken by header "=?UTF-8?B?" and trailer "?=" plus '\0' */
char b64_buf[ZBX_EMAIL_B64_MAXWORD_RFC2047 - 12 + 1];
str_base64_encode(p0, b64_buf, p1 - p0);
if (0 != p_base64_offset) /* not the first "encoded-word" ? */
{
zbx_strcpy_alloc(p_base64, &p_base64_alloc, &p_base64_offset,
ZBX_EMAIL_ENCODED_WORD_SEPARATOR);
}
zbx_snprintf_alloc(p_base64, &p_base64_alloc, &p_base64_offset, "=?UTF-8?B?%s?=", b64_buf);
}
else
break;
}
}