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rfc822.c
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rfc822.c
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/*
mairix - message index builder and finder for maildir folders.
**********************************************************************
* Copyright (C) Richard P. Curnow 2002,2003,2004,2005,2006,2007,2010
* rfc2047 decode:
* Copyright (C) Mikael Ylikoski 2002
* gzip mbox support:
* Copyright (C) Ico Doornekamp 2005
* Copyright (C) Felipe Gustavo de Almeida 2005
* bzip2 mbox support:
* Copyright (C) Paramjit Oberoi 2005
* caching uncompressed mbox data:
* Copyright (C) Chris Mason 2006
* memory leak fixes:
* Copyright (C) Samuel Tardieu 2008
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
**********************************************************************
*/
#include "mairix.h"
#include "nvp.h"
#include <assert.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#ifdef USE_GZIP_MBOX
# include <zlib.h>
#endif
#ifdef USE_BZIP_MBOX
# include <bzlib.h>
#endif
#ifdef USE_XZ_MBOX
# include "xzfile.h"
#endif
struct DLL {/*{{{*/
struct DLL *next;
struct DLL *prev;
};
/*}}}*/
static void enqueue(void *head, void *x)/*{{{*/
{
/* Declare this way so it can be used with any kind of double linked list
* having next & prev pointers in its first two words. */
struct DLL *h = (struct DLL *) head;
struct DLL *xx = (struct DLL *) x;
xx->next = h;
xx->prev = h->prev;
h->prev->next = xx;
h->prev = xx;
return;
}
/*}}}*/
enum encoding_type {/*{{{*/
ENC_UNKNOWN,
ENC_NONE,
ENC_BINARY,
ENC_7BIT,
ENC_8BIT,
ENC_QUOTED_PRINTABLE,
ENC_BASE64,
ENC_UUENCODE
};
/*}}}*/
struct content_type_header {/*{{{*/
const char *major; /* e.g. text */
const char *minor; /* e.g. plain */
const char *boundary; /* for multipart */
/* charset? */
};
/*}}}*/
struct line {/*{{{*/
struct line *next;
struct line *prev;
char *text;
};
/*}}}*/
static void init_headers(struct headers *hdrs)/*{{{*/
{
hdrs->to = NULL;
hdrs->cc = NULL;
hdrs->from = NULL;
hdrs->subject = NULL;
hdrs->message_id = NULL;
hdrs->in_reply_to = NULL;
hdrs->references = NULL;
hdrs->date = 0;
hdrs->flags.seen = 0;
hdrs->flags.replied = 0;
hdrs->flags.flagged = 0;
};
/*}}}*/
static void splice_header_lines(struct line *header)/*{{{*/
{
/* Deal with newline then tab in header */
struct line *x, *next;
for (x=header->next; x!=header; x=next) {
#if 0
printf("next header, x->text=%08lx\n", x->text);
printf("header=<%s>\n", x->text);
#endif
next = x->next;
if (isspace(x->text[0] & 0xff)) {
/* Glue to previous line */
char *p, *newbuf, *oldbuf;
struct line *y;
for (p=x->text; *p; p++) {
if (!isspace(*(unsigned char *)p)) break;
}
p--; /* point to final space */
y = x->prev;
#if 0
printf("y=%08lx p=%08lx\n", y->text, p);
#endif
newbuf = new_array(char, strlen(y->text) + strlen(p) + 1);
strcpy(newbuf, y->text);
strcat(newbuf, p);
oldbuf = y->text;
y->text = newbuf;
free(oldbuf);
y->next = x->next;
x->next->prev = y;
free(x->text);
free(x);
}
}
return;
}
/*}}}*/
static int audit_header(struct line *header)/*{{{*/
{
/* Check for obvious broken-ness
* 1st line has no leading spaces, single word then colon
* following lines have leading spaces or single word followed by colon
* */
struct line *x;
int first=1;
int count=1;
for (x=header->next; x!=header; x=x->next) {
int has_leading_space=0;
int is_blank;
int has_word_colon=0;
if (1 || first) {
/* Ignore any UUCP or mbox style From line at the start */
if (!strncmp("From ", x->text, 5)) {
continue;
}
/* Ignore escaped From line at the start */
if (!strncmp(">From ", x->text, 6)) {
continue;
}
}
is_blank = !(x->text[0]);
if (!is_blank) {
char *p;
int saw_char = 0;
has_leading_space = isspace(x->text[0] & 0xff);
has_word_colon = 0; /* default */
p = x->text;
while(*p) {
if(*p == ':') {
has_word_colon = saw_char;
break;
} else if (isspace(*(unsigned char *) p)) {
has_word_colon = 0;
break;
} else {
saw_char = 1;
}
p++;
}
}
if (( first && (is_blank || has_leading_space || !has_word_colon)) ||
(!first && (is_blank || !(has_leading_space || has_word_colon)))) {
#if 0
fprintf(stderr, "Header line %d <%s> fails because:", count, x->text);
if (first && is_blank) { fprintf(stderr, " [first && is_blank]"); }
if (first && has_leading_space) { fprintf(stderr, " [first && has_leading_space]"); }
if (first && !has_word_colon) { fprintf(stderr, " [first && !has_word_colon]"); }
if (!first && is_blank) { fprintf(stderr, " [!first && is_blank]"); }
if (!first && !(has_leading_space||has_word_colon)) { fprintf(stderr, " [!first && !has_leading_space||has_word_colon]"); }
fprintf(stderr, "\n");
#endif
/* Header fails the audit */
return 0;
}
first = 0;
count++;
}
/* If we get here the header must have been OK */
return 1;
}/*}}}*/
static int match_string(const char *ref, const char *candidate)/*{{{*/
{
int len = strlen(ref);
return !strncasecmp(ref, candidate, len);
}
/*}}}*/
static char equal_table[] = {/*{{{*/
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 00-0f */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 10-1f */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 20-2f */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, /* 30-3f */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 40-4f */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 50-5f */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 60-6f */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 70-7f */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 80-8f */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 90-9f */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* a0-af */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* b0-bf */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* c0-cf */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* d0-df */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* e0-ef */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 /* f0-ff */
};
/*}}}*/
static int base64_table[] = {/*{{{*/
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 00-0f */
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 10-1f */
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, /* 20-2f */
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, 0, -1, -1, /* 30-3f */
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, /* 40-4f */
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, /* 50-5f */
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, /* 60-6f */
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1, /* 70-7f */
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 80-8f */
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 90-9f */
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* a0-af */
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* b0-bf */
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* c0-cf */
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* d0-df */
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* e0-ef */
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 /* f0-ff */
};
/*}}}*/
static int hex_to_val(char x) {/*{{{*/
switch (x) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
return (x - '0');
break;
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
return 10 + (x - 'a');
break;
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
return 10 + (x - 'A');
break;
default:
return 0;
}
}
/*}}}*/
static void decode_header_value(char *text){/*{{{*/
/* rfc2047 decode, written by Mikael Ylikoski */
char *s, *a, *b, *e, *p, *q;
for (p = q = s = text; (s = strstr(s, "=?")); s = e + 2) {
if (p == q)
p = q = s;
else
while (q != s)
*p++ = *q++;
s += 2;
a = strchr(s, '?');
if (!a) break;
a++;
b = strchr(a, '?');
if (!b) break;
b++;
e = strstr(b, "?=");
if (!e) break;
/* have found an encoded-word */
if (b - a != 2)
continue; /* unknown encoding */
if (*a == 'q' || *a == 'Q') {
int val;
q = b;
while (q < e) {
if (*q == '_') {
*p++ = 0x20;
q++;
} else if (*q == '=') {
q++;
val = hex_to_val(*q++) << 4;
val += hex_to_val(*q++);
*p++ = val;
} else
*p++ = *q++;
}
} else if (*a == 'b' || *a == 'B') {
int reg, nc, eq; /* register, #characters in reg, #equals */
int dc; /* decoded character */
eq = reg = nc = 0;
for (q = b; q < e; q++) {
unsigned char cq = *(unsigned char *)q;
dc = base64_table[cq];
eq += equal_table[cq];
if (dc >= 0) {
reg <<= 6;
reg += dc;
nc++;
if (nc == 4) {
*p++ = ((reg >> 16) & 0xff);
if (eq < 2) *p++ = ((reg >> 8) & 0xff);
if (eq < 1) *p++ = reg & 0xff;
nc = reg = 0;
if (eq) break;
}
}
}
} else {
continue; /* unknown encoding */
}
q = e + 2;
}
if (p == q) return;
while (*q != '\0')
*p++ = *q++;
*p = '\0';
}
/*}}}*/
static char *copy_header_value(char *text){/*{{{*/
char *p;
for (p = text; *p && (*p != ':'); p++) ;
if (!*p) return NULL;
p++;
p = new_string(p);
decode_header_value(p);
return p;
}
/*}}}*/
static void copy_or_concat_header_value(char **previous, char *text){/*{{{*/
char *p = copy_header_value(text);
if (*previous)
{
*previous = extend_string(*previous, ", ");
*previous = extend_string(*previous, p);
free(p);
}
else
*previous = p;
}
/*}}}*/
static enum encoding_type decode_encoding_type(const char *e)/*{{{*/
{
enum encoding_type result;
const char *p;
if (!e) {
result = ENC_NONE;
} else {
for (p=e; *p && isspace(*(unsigned char *)p); p++) ;
if ( match_string("7bit", p)
|| match_string("7-bit", p)
|| match_string("7 bit", p)) {
result = ENC_7BIT;
} else if (match_string("8bit", p)
|| match_string("8-bit", p)
|| match_string("8 bit", p)) {
result = ENC_8BIT;
} else if (match_string("quoted-printable", p)) {
result = ENC_QUOTED_PRINTABLE;
} else if (match_string("base64", p)) {
result = ENC_BASE64;
} else if (match_string("binary", p)) {
result = ENC_BINARY;
} else if (match_string("x-uuencode", p)) {
result = ENC_UUENCODE;
} else {
fprintf(stderr, "Warning: unknown encoding type: '%s'\n", e);
result = ENC_UNKNOWN;
}
}
return result;
}
/*}}}*/
static void parse_content_type(struct nvp *ct_nvp, struct content_type_header *result)/*{{{*/
{
result->major = NULL;
result->minor = NULL;
result->boundary = NULL;
result->major = nvp_major(ct_nvp);
if (result->major) {
result->minor = nvp_minor(ct_nvp);
} else {
result->minor = NULL;
result->major = nvp_first(ct_nvp);
}
result->boundary = nvp_lookupcase(ct_nvp, "boundary");
}
/*}}}*/
static char *looking_at_ws_then_newline(char *start)/*{{{*/
{
char *result;
result = start;
do {
if (*result == '\n') return result;
else if (!isspace(*(unsigned char *) result)) return NULL;
else result++;
} while (1);
/* Can't get here */
assert(0);
}
/*}}}*/
static char *unencode_data(struct msg_src *src, char *input, int input_len, const char *enc, int *output_len)/*{{{*/
{
enum encoding_type encoding;
char *result, *end_result;
char *end_input;
encoding = decode_encoding_type(enc);
end_input = input + input_len;
/* All mime encodings result in expanded data, so this is guaranteed to
* safely oversize the output array */
result = new_array(char, input_len + 1);
/* Now decode */
switch (encoding) {
case ENC_7BIT:/*{{{*/
case ENC_8BIT:
case ENC_BINARY:
case ENC_NONE:
{
memcpy(result, input, input_len);
end_result = result + input_len;
}
break;
/*}}}*/
case ENC_QUOTED_PRINTABLE:/*{{{*/
{
char *p, *q;
p = result;
for (p=result, q=input;
q<end_input; ) {
if (*q == '=') {
/* followed by optional whitespace then \n? discard them. */
char *r;
int val;
q++;
r = looking_at_ws_then_newline(q);
if (r) {
q = r + 1; /* Point into next line */
continue;
}
/* not that case. */
val = hex_to_val(*q++) << 4;
val += hex_to_val(*q++);
*p++ = val;
} else {
/* Normal character */
*p++ = *q++;
}
}
end_result = p;
}
break;
/*}}}*/
case ENC_BASE64:/*{{{*/
{
char *p, *q;
int reg, nc, eq; /* register, #characters in reg, #equals */
int dc; /* decoded character */
eq = reg = nc = 0;
for (q=input, p=result; q<end_input; q++) {
unsigned char cq = * (unsigned char *)q;
/* Might want a 256 entry array instead of this sub-optimal mess
* eventually. */
dc = base64_table[cq];
eq += equal_table[cq];
if (dc >= 0) {
reg <<= 6;
reg += dc;
nc++;
if (nc == 4) {
*p++ = ((reg >> 16) & 0xff);
if (eq < 2) *p++ = ((reg >> 8) & 0xff);
if (eq < 1) *p++ = reg & 0xff;
nc = reg = 0;
if (eq) goto done_base_64;
}
}
}
done_base_64:
end_result = p;
}
break;
/*}}}*/
case ENC_UUENCODE:/*{{{*/
{
char *p, *q;
/* Find 'begin ' */
for (q = input; q < end_input - 6 && memcmp(q, "begin ", 6); q++)
;
q += 6;
/* skip to EOL */
while (q < end_input && *q != '\n')
q++;
p = result;
while (q < end_input) { /* process line */
#define DEC(c) (((c) - ' ') & 077)
int len = DEC(*q++);
if (len == 0)
break;
for (; len > 0; q += 4, len -= 3) {
if (len >= 3) {
*p++ = DEC(q[0]) << 2 | DEC(q[1]) >> 4;
*p++ = DEC(q[1]) << 4 | DEC(q[2]) >> 2;
*p++ = DEC(q[2]) << 6 | DEC(q[3]);
} else {
if (len >= 1)
*p++ = DEC(q[0]) << 2 | DEC(q[1]) >> 4;
if (len >= 2)
*p++ = DEC(q[1]) << 4 | DEC(q[2]) >> 2;
}
}
while (q < end_input && *q != '\n')
q++;
}
end_result = p;
}
break;
/*}}}*/
case ENC_UNKNOWN:/*{{{*/
fprintf(stderr, "Unknown encoding type in %s\n", format_msg_src(src));
/* fall through - ignore this data */
/*}}}*/
default:/*{{{*/
end_result = result;
break;
/*}}}*/
}
*output_len = end_result - result;
result[*output_len] = '\0'; /* for convenience with text/plain etc to make it printable */
return result;
}
/*}}}*/
char *format_msg_src(struct msg_src *src)/*{{{*/
{
static char *buffer = NULL;
static int buffer_len = 0;
char *result;
int len;
switch (src->type) {
case MS_FILE:
result = src->filename;
break;
case MS_MBOX:
len = strlen(src->filename);
len += 32;
if (!buffer || (len > buffer_len)) {
free(buffer);
buffer = new_array(char, len);
buffer_len = len;
}
sprintf(buffer, "%s[%d,%d)", src->filename,
(int) src->start, (int) (src->start + src->len));
result = buffer;
break;
default:
result = NULL;
break;
}
return result;
}
/*}}}*/
static int split_and_splice_header(struct msg_src *src, char *data, size_t data_len, struct line *header, char **body_start)/*{{{*/
{
char *sol, *eol;
int blank_line;
header->next = header->prev = header;
sol = data;
do {
if ((data_len == 0) || (!*sol)) break;
blank_line = 1; /* until proven otherwise */
eol = sol;
while ((data_len > 0) && *eol && (*eol != '\n')) {
if (!isspace(*(unsigned char *) eol)) blank_line = 0;
eol++;
data_len--;
}
if (data_len == 0) {
fprintf(stderr, "Found end of message while still in header processing %s\n",
format_msg_src(src));
return -1; /* & leak memory */
} else if (*eol == '\n') {
if (!blank_line) {
int line_length = eol - sol;
char *line_text = new_array(char, 1 + line_length);
struct line *new_header;
strncpy(line_text, sol, line_length);
line_text[line_length] = '\0';
new_header = new(struct line);
new_header->text = line_text;
enqueue(header, new_header);
}
sol = eol + 1; /* Start of next line */
data_len--;
} else { /* must be null char */
fprintf(stderr, "Got null character whilst processing header of %s\n",
format_msg_src(src));
return -1; /* & leak memory */
}
} while (!blank_line);
*body_start = sol;
if (audit_header(header)) {
splice_header_lines(header);
return 0;
} else {
#if 0
/* Caller generates message */
fprintf(stderr, "Message had bad rfc822 headers, ignoring\n");
#endif
return -1;
}
}
/*}}}*/
/* Forward prototypes */
static void do_multipart(struct msg_src *src, char *input, int input_len,
const char *boundary, struct attachment *atts,
enum data_to_rfc822_error *error);
/*{{{ do_body() */
static void do_body(struct msg_src *src,
char *body_start, int body_len,
struct nvp *ct_nvp, struct nvp *cte_nvp,
struct nvp *cd_nvp,
struct attachment *atts,
enum data_to_rfc822_error *error)
{
char *decoded_body;
int decoded_body_len;
const char *content_transfer_encoding;
content_transfer_encoding = NULL;
if (cte_nvp) {
content_transfer_encoding = nvp_first(cte_nvp);
if (!content_transfer_encoding) {
fprintf(stderr, "Giving up on %s, content_transfer_encoding header not parseable\n",
format_msg_src(src));
return;
}
}
decoded_body = unencode_data(src, body_start, body_len, content_transfer_encoding, &decoded_body_len);
if (ct_nvp) {
struct content_type_header ct;
parse_content_type(ct_nvp, &ct);
if (ct.major && !strcasecmp(ct.major, "multipart")) {
do_multipart(src, decoded_body, decoded_body_len, ct.boundary, atts, error);
/* Don't need decoded body any longer - copies have been taken if
* required when handling multipart attachments. */
free(decoded_body);
if (error && (*error == DTR8_MISSING_END)) return;
} else {
/* unipart */
struct attachment *new_att;
const char *disposition;
new_att = new(struct attachment);
disposition = cd_nvp ? nvp_first(cd_nvp) : NULL;
if (disposition && !strcasecmp(disposition, "attachment")) {
const char *lookup;
lookup = nvp_lookupcase(cd_nvp, "filename");
if (lookup) {
new_att->filename = new_string(lookup);
} else {
/* Some messages have name=... in content-type: instead of
* filename=... in content-disposition. */
lookup = nvp_lookup(ct_nvp, "name");
if (lookup) {
new_att->filename = new_string(lookup);
} else {
new_att->filename = NULL;
}
}
} else {
new_att->filename = NULL;
}
if (ct.major && !strcasecmp(ct.major, "text")) {
if (ct.minor && !strcasecmp(ct.minor, "plain")) {
new_att->ct = CT_TEXT_PLAIN;
} else if (ct.minor && !strcasecmp(ct.minor, "html")) {
new_att->ct = CT_TEXT_HTML;
} else {
new_att->ct = CT_TEXT_OTHER;
}
} else if (ct.major && !strcasecmp(ct.major, "message") &&
ct.minor && !strcasecmp(ct.minor, "rfc822")) {
new_att->ct = CT_MESSAGE_RFC822;
} else {
new_att->ct = CT_OTHER;
}
if (new_att->ct == CT_MESSAGE_RFC822) {
new_att->data.rfc822 = data_to_rfc822(src, decoded_body, decoded_body_len, error);
free(decoded_body); /* data no longer needed */
} else {
new_att->data.normal.len = decoded_body_len;
new_att->data.normal.bytes = decoded_body;
}
enqueue(atts, new_att);
}
} else {
/* Treat as text/plain {{{*/
struct attachment *new_att;
new_att = new(struct attachment);
new_att->filename = NULL;
new_att->ct = CT_TEXT_PLAIN;
new_att->data.normal.len = decoded_body_len;
/* Add null termination on the end */
new_att->data.normal.bytes = new_array(char, decoded_body_len + 1);
memcpy(new_att->data.normal.bytes, decoded_body, decoded_body_len + 1);
free(decoded_body);
enqueue(atts, new_att);/*}}}*/
}
}
/*}}}*/
/*{{{ do_attachment() */
static void do_attachment(struct msg_src *src,
char *start, char *after_end,
struct attachment *atts)
{
/* decode attachment and add to attachment list */
struct line header, *x, *nx;
char *body_start;
int body_len;
struct nvp *ct_nvp, *cte_nvp, *cd_nvp, *nvp;
if (split_and_splice_header(src, start, after_end-start, &header, &body_start) < 0) {
fprintf(stderr, "Giving up on attachment with bad header in %s\n",
format_msg_src(src));
return;
}
/* Extract key headers */
ct_nvp = cte_nvp = cd_nvp = NULL;
for (x=header.next; x!=&header; x=x->next) {
if ((nvp = make_nvp(src, x->text, "content-type:"))) {
ct_nvp = nvp;
} else if ((nvp = make_nvp(src, x->text, "content-transfer-encoding:"))) {
cte_nvp = nvp;
} else if ((nvp = make_nvp(src, x->text, "content-disposition:"))) {
cd_nvp = nvp;
}
}
#if 0
if (ct_nvp) {
fprintf(stderr, "======\n");
fprintf(stderr, "Dump of content-type hdr\n");
nvp_dump(ct_nvp, stderr);
free(ct_nvp);
}
if (cte_nvp) {
fprintf(stderr, "======\n");
fprintf(stderr, "Dump of content-transfer-encoding hdr\n");
nvp_dump(cte_nvp, stderr);
free(cte_nvp);
}
#endif
if (body_start > after_end) {
/* This is a (maliciously?) b0rken attachment, e.g. maybe empty */
if (verbose) {
fprintf(stderr, "Message %s contains an invalid attachment, length=%d bytes\n",
format_msg_src(src), (int)(after_end - start));
}
} else {
body_len = after_end - body_start;
/* Ignore errors in nested body parts. */
do_body(src, body_start, body_len, ct_nvp, cte_nvp, cd_nvp, atts, NULL);
}
/* Free header memory */
for (x=header.next; x!=&header; x=nx) {
nx = x->next;
free(x->text);
free(x);
}
if (ct_nvp) free_nvp(ct_nvp);
if (cte_nvp) free_nvp(cte_nvp);
if (cd_nvp) free_nvp(cd_nvp);
}
/*}}}*/
/*{{{ do_multipart() */
static void do_multipart(struct msg_src *src,
char *input, int input_len,
const char *boundary,
struct attachment *atts,
enum data_to_rfc822_error *error)
{
char *b0, *b1, *be, *bx;
char *line_after_b0, *start_b1_search_from;
int boundary_len;
int looking_at_end_boundary;
if (!boundary) {
fprintf(stderr, "Can't process multipart message %s with no boundary string\n",
format_msg_src(src));
if (error) *error = DTR8_MULTIPART_SANS_BOUNDARY;
return;
}
boundary_len = strlen(boundary);
b0 = NULL;
line_after_b0 = input;
be = input + input_len;
do {
int boundary_ok;
start_b1_search_from = line_after_b0;
do {
/* reject boundaries that aren't a whole line */
b1 = NULL;
for (bx = start_b1_search_from; bx < be - (boundary_len + 2); bx++) {
if (bx[0] == '-' && bx[1] == '-' &&
!strncmp(bx+2, boundary, boundary_len)) {
b1 = bx;
break;
}
}
if (!b1) {
if (error)
*error = DTR8_MISSING_END;
return;
}
looking_at_end_boundary = (b1+boundary_len+3 < be) && (b1[boundary_len+2] == '-' &&
b1[boundary_len+3] == '-');
boundary_ok = 1;
if ((b1 > input) && (*(b1-1) != '\n'))
boundary_ok = 0;
if (!looking_at_end_boundary && (b1 + boundary_len + 3 < be) && !(
((b1 + boundary_len + 2 < input + input_len) && (*(b1 + boundary_len + 2) == '\n')) ||
((b1 + boundary_len + 3 < input + input_len) && (*(b1 + boundary_len + 2) == '\r') && (*(b1 + boundary_len + 3) == '\n'))
))
boundary_ok = 0;
if (!boundary_ok) {
char *eol = strchr(b1, '\n');
if (!eol) {
fprintf(stderr, "Oops, didn't find another normal boundary in %s\n",
format_msg_src(src));
return;
}
start_b1_search_from = 1 + eol;
}
} while (!boundary_ok);
/* b1 is now looking at a good boundary, which might be the final one */
if (b0) {
/* don't treat preamble as an attachment */
do_attachment(src, line_after_b0, b1, atts);
}
b0 = b1;
line_after_b0 = strchr(b0, '\n');
if (line_after_b0 == 0)
line_after_b0 = b0 + strlen(b0);
else
++line_after_b0;
} while (b1 < be && !looking_at_end_boundary);
}
/*}}}*/
static time_t parse_rfc822_date(char *date_string)/*{{{*/
{
struct tm tm;
char *s, *z;
/* Format [weekday ,] day-of-month month year hour:minute:second timezone.
Some of the ideas, sanity checks etc taken from parse.c in the mutt
sources, credit to Michael R. Elkins et al
*/
s = date_string;
z = strchr(s, ',');
if (z) s = z + 1;
while (*s && isspace(*s)) s++;
/* Should now be looking at day number */
if (!isdigit(*s)) goto tough_cheese;
tm.tm_mday = atoi(s);
if (tm.tm_mday > 31) goto tough_cheese;
while (isdigit(*s)) s++;
while (*s && isspace(*s)) s++;
if (!*s) goto tough_cheese;
if (!strncasecmp(s, "jan", 3)) tm.tm_mon = 0;
else if (!strncasecmp(s, "feb", 3)) tm.tm_mon = 1;
else if (!strncasecmp(s, "mar", 3)) tm.tm_mon = 2;
else if (!strncasecmp(s, "apr", 3)) tm.tm_mon = 3;
else if (!strncasecmp(s, "may", 3)) tm.tm_mon = 4;
else if (!strncasecmp(s, "jun", 3)) tm.tm_mon = 5;
else if (!strncasecmp(s, "jul", 3)) tm.tm_mon = 6;
else if (!strncasecmp(s, "aug", 3)) tm.tm_mon = 7;
else if (!strncasecmp(s, "sep", 3)) tm.tm_mon = 8;
else if (!strncasecmp(s, "oct", 3)) tm.tm_mon = 9;
else if (!strncasecmp(s, "nov", 3)) tm.tm_mon = 10;
else if (!strncasecmp(s, "dec", 3)) tm.tm_mon = 11;
else goto tough_cheese;
while (!isspace(*s)) s++;
while (*s && isspace(*s)) s++;
if (!isdigit(*s)) goto tough_cheese;
tm.tm_year = atoi(s);
if (tm.tm_year < 70) {
tm.tm_year += 100;
} else if (tm.tm_year >= 1900) {
tm.tm_year -= 1900;
}
while (isdigit(*s)) s++;
while (*s && isspace(*s)) s++;
if (!*s) goto tough_cheese;
/* Now looking at hms */
/* For now, forget this. The searching will be vague enough that nearest day is good enough. */
tm.tm_hour = 0;
tm.tm_min = 0;
tm.tm_sec = 0;
tm.tm_isdst = 0;
return mktime(&tm);
tough_cheese:
return (time_t) -1; /* default value */
}
/*}}}*/
static void scan_status_flags(const char *s, struct headers *hdrs)/*{{{*/
{
const char *p;
for (p=s; *p; p++) {
switch (*p) {
case 'R': hdrs->flags.seen = 1; break;
case 'A': hdrs->flags.replied = 1; break;
case 'F': hdrs->flags.flagged = 1; break;
default: break;
}
}
}