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/*
* Copyright (C) 2021 Kevin J. McCarthy <kevin@8t8.us>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "mutt.h"
#include "mutt_random.h"
static char MsgIdPfx = 'A';
typedef struct msg_id_data
{
time_t now;
struct tm tm;
const char *fqdn;
} MSG_ID_DATA;
static const char *id_format_str (char *dest, size_t destlen, size_t col,
int cols, char op, const char *src,
const char *fmt, const char *ifstring,
const char *elsestring,
void *data, format_flag flags)
{
MSG_ID_DATA *id_data = (MSG_ID_DATA *)data;
char tmp[STRING];
unsigned char r_raw[3];
unsigned char r_out[4 + 1];
unsigned char z_raw[12]; /* 32 bit timestamp, plus 64 bit randomness */
unsigned char z_out[16 + 1];
switch (op)
{
case 'r':
mutt_random_bytes ((char *)r_raw, sizeof(r_raw));
mutt_to_base64_safeurl (r_out, r_raw, sizeof(r_raw), sizeof(r_out));
mutt_format_s (dest, destlen, fmt, (const char *)r_out);
break;
case 'x':
/* hex encoded random byte */
mutt_random_bytes ((char *)r_raw, sizeof(r_raw[0]));
snprintf (dest, destlen, "%02x", r_raw[0]);
break;
case 'z':
/* Convert the four least significant bytes of our timestamp and put it in
localpart, with proper endianness (for humans) taken into account. */
for (int i = 0; i < 4; i++)
z_raw[i] = (uint8_t) (id_data->now >> (3-i)*8u);
mutt_random_bytes ((char *)z_raw + 4, sizeof(z_raw) - 4);
mutt_to_base64_safeurl (z_out, z_raw, sizeof(z_raw), sizeof(z_out));
mutt_format_s (dest, destlen, fmt, (const char *)z_out);
break;
case 'Y':
snprintf (tmp, sizeof (tmp), "%%%sd", fmt);
snprintf (dest, destlen, tmp, id_data->tm.tm_year + 1900);
break;
case 'm':
snprintf (tmp, sizeof (tmp), "%%%sd", fmt);
snprintf (dest, destlen, tmp, id_data->tm.tm_mon + 1);
break;
case 'd':
snprintf (tmp, sizeof (tmp), "%%%sd", fmt);
snprintf (dest, destlen, tmp, id_data->tm.tm_mday);
break;
case 'H':
snprintf (tmp, sizeof (tmp), "%%%sd", fmt);
snprintf (dest, destlen, tmp, id_data->tm.tm_hour);
break;
case 'M':
snprintf (tmp, sizeof (tmp), "%%%sd", fmt);
snprintf (dest, destlen, tmp, id_data->tm.tm_min);
break;
case 'S':
snprintf (tmp, sizeof (tmp), "%%%sd", fmt);
snprintf (dest, destlen, tmp, id_data->tm.tm_sec);
break;
case 'c':
snprintf (dest, destlen, "%c", MsgIdPfx);
MsgIdPfx = (MsgIdPfx == 'Z') ? 'A' : MsgIdPfx + 1;
break;
case 'p':
snprintf (tmp, sizeof (tmp), "%%%su", fmt);
snprintf (dest, destlen, tmp, (unsigned int)getpid ());
break;
case 'f':
mutt_format_s (dest, destlen, fmt, id_data->fqdn);
break;
}
return (src);
}
char *mutt_gen_msgid (void)
{
MSG_ID_DATA id_data;
BUFFER *buf, *tmp;
const char *fmt;
char *rv;
id_data.now = time (NULL);
memcpy (&id_data.tm, gmtime (&id_data.now), sizeof(id_data.tm));
if (!(id_data.fqdn = mutt_fqdn(0)))
id_data.fqdn = NONULL(Hostname);
fmt = MessageIdFormat;
if (!fmt)
fmt = "<%z@%f>";
buf = mutt_buffer_pool_get ();
mutt_FormatString (buf->data, buf->dsize, 0, buf->dsize,
fmt, id_format_str, &id_data, 0);
mutt_buffer_fix_dptr (buf);
/* this is hardly a thorough check, but at least make sure
* we have the angle brackets. */
if (!mutt_buffer_len (buf) ||
(*buf->data != '<') || (*(buf->dptr - 1) != '>'))
{
tmp = mutt_buffer_pool_get ();
if (!mutt_buffer_len (buf) || *buf->data != '<')
mutt_buffer_addch (tmp, '<');
mutt_buffer_addstr (tmp, mutt_b2s (buf));
if (!mutt_buffer_len (buf) || *(buf->dptr - 1) != '>')
mutt_buffer_addch (tmp, '>');
mutt_buffer_strcpy (buf, mutt_b2s (tmp));
mutt_buffer_pool_release (&tmp);
}
rv = safe_strdup (mutt_b2s (buf));
mutt_buffer_pool_release (&buf);
return rv;
}
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