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/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
*/
/* NOTE: much of the functionality implemented here should eventually appear
* somewhere in Dovecot itself.
*/
#include "lib.h"
#include "str.h"
#include "unichar.h"
#include "rfc2822.h"
#include "message-header-encode.h"
#include <stdio.h>
#include <ctype.h>
bool rfc2822_header_field_name_verify
(const char *field_name, unsigned int len)
{
const char *p = field_name;
const char *pend = p + len;
/* field-name = 1*ftext
* ftext = %d33-57 / ; Any character except
* %d59-126 ; controls, SP, and
* ; ":".
*/
while ( p < pend ) {
if ( *p < 33 || *p == ':' )
return FALSE;
p++;
}
return TRUE;
}
bool rfc2822_header_field_body_verify
(const char *field_body, unsigned int len, bool allow_crlf, bool allow_utf8)
{
const unsigned char *p = (const unsigned char *)field_body;
const unsigned char *pend = p + len;
bool is8bit = FALSE;
/* RFC5322:
*
* unstructured = (*([FWS] VCHAR) *WSP)
* VCHAR = %x21-7E
* FWS = ([*WSP CRLF] 1*WSP) / ; Folding white space
* WSP = SP / HTAB ; White space
*/
while ( p < pend ) {
if ( *p < 0x20 ) {
if ( (*p == '\r' || *p == '\n') ) {
if ( !allow_crlf )
return FALSE;
} else if ( *p != '\t' ) {
return FALSE;
}
}
if ( !is8bit && *p > 127 ) {
if ( !allow_utf8 )
return FALSE;
is8bit = TRUE;
}
p++;
}
if ( is8bit && !uni_utf8_str_is_valid(field_body) ) {
return FALSE;
}
return TRUE;
}
/*
*
*/
const char *rfc2822_header_field_name_sanitize(const char *name)
{
char *result = t_strdup_noconst(name);
char *p;
/* Make the whole name lower case ... */
result = str_lcase(result);
/* ... except for the first letter and those that follow '-' */
p = result;
*p = i_toupper(*p);
while ( *p != '\0' ) {
if ( *p == '-' ) {
p++;
if ( *p != '\0' )
*p = i_toupper(*p);
continue;
}
p++;
}
return result;
}
/*
* Message construction
*/
/* FIXME: This should be collected into a Dovecot API for composing internet
* mail messages.
*/
unsigned int rfc2822_header_append
(string_t *header, const char *name, const char *body, bool crlf,
uoff_t *body_offset_r)
{
static const unsigned int max_line = 80;
const char *bp = body; /* Pointer */
const char *sp = body; /* Start pointer */
const char *wp = NULL; /* Whitespace pointer */
const char *nlp = NULL; /* New-line pointer */
unsigned int line_len = strlen(name);
unsigned int lines = 0;
/* Write header field name first */
str_append(header, name);
str_append(header, ": ");
if ( body_offset_r != NULL )
*body_offset_r = str_len(header);
line_len += 2;
/* Add field body; fold it if necessary and account for existing folding */
while ( *bp != '\0' ) {
bool ws_first = TRUE;
while ( *bp != '\0' && nlp == NULL &&
(wp == NULL || line_len < max_line) ) {
if ( *bp == ' ' || *bp == '\t' ) {
if (ws_first)
wp = bp;
ws_first = FALSE;
} else if ( *bp == '\r' || *bp == '\n' ) {
if (ws_first)
nlp = bp;
else
nlp = wp;
break;
} else {
ws_first = TRUE;
}
bp++; line_len++;
}
if ( *bp == '\0' ) break;
/* Existing newline ? */
if ( nlp != NULL ) {
/* Replace any consecutive newline and whitespace for
consistency */
while ( *bp == ' ' || *bp == '\t' || *bp == '\r' || *bp == '\n' )
bp++;
str_append_data(header, sp, nlp-sp);
if ( crlf )
str_append(header, "\r\n");
else
str_append(header, "\n");
while ( *bp == ' ' || *bp == '\t' )
bp++;
if ( *bp != '\0' ) {
/* Continued line; replace leading whitespace with single TAB */
str_append_c(header, '\t');
}
sp = bp;
} else {
/* Insert newline at last whitespace within the max_line limit */
i_assert(wp >= sp);
str_append_data(header, sp, wp-sp);
/* Force continued line; drop any existing whitespace */
while ( *wp == ' ' || *wp == '\t' )
wp++;
if ( crlf )
str_append(header, "\r\n");
else
str_append(header, "\n");
/* Insert single TAB instead of the original whitespace */
str_append_c(header, '\t');
sp = wp;
if (sp > bp)
bp = sp;
}
lines++;
line_len = bp - sp;
wp = NULL;
nlp = NULL;
}
if ( bp != sp || lines == 0 ) {
str_append_data(header, sp, bp-sp);
if ( crlf )
str_append(header, "\r\n");
else
str_append(header, "\n");
lines++;
}
return lines;
}
void rfc2822_header_printf
(string_t *header, const char *name, const char *fmt, ...)
{
const char *body;
va_list args;
va_start(args, fmt);
body = t_strdup_vprintf(fmt, args);
va_end(args);
rfc2822_header_write(header, name, body);
}
void rfc2822_header_utf8_printf
(string_t *header, const char *name, const char *fmt, ...)
{
string_t *body = t_str_new(256);
va_list args;
va_start(args, fmt);
message_header_encode(t_strdup_vprintf(fmt, args), body);
va_end(args);
rfc2822_header_write(header, name, str_c(body));
}
void rfc2822_header_write_address(string_t *header,
const char *name, const char *address)
{
bool has_8bit = FALSE;
const char *p;
for (p = address; *p != '\0'; p++) {
if ((*p & 0x80) != 0)
has_8bit = TRUE;
}
if (!has_8bit) {
rfc2822_header_write(header, name, address);
} else {
string_t *body = t_str_new(256);
message_header_encode(address, body);
rfc2822_header_write(header, name, str_c(body));
}
}
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