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/* $OpenBSD: parsemsg.c,v 1.1 2022/01/13 10:34:07 martijn Exp $ */
/*
* Copyright (c) 2022 Martijn van Duren <martijn@openbsd>
* Copyright (c) 2014-2021 Alexander Bluhm <bluhm@genua.de>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include "parsemsg.h"
#include "syslogd.h"
size_t parsemsg_timestamp_bsd(const char *, char *);
size_t parsemsg_timestamp_v1(const char *, char *);
size_t parsemsg_prog(const char *, char *);
struct msg *
parsemsg(const char *msgstr, struct msg *msg)
{
size_t n;
msg->m_pri = -1;
msgstr += parsemsg_priority(msgstr, &msg->m_pri);
if (msg->m_pri &~ (LOG_FACMASK|LOG_PRIMASK))
msg->m_pri = -1;
if ((n = parsemsg_timestamp_bsd(msgstr, msg->m_timestamp)) == 0)
n = parsemsg_timestamp_v1(msgstr, msg->m_timestamp);
msgstr += n;
while (isspace(msgstr[0]))
msgstr++;
parsemsg_prog(msgstr, msg->m_prog);
strlcpy(msg->m_msg, msgstr, sizeof(msg->m_msg));
return msg;
}
/*
* Parse a priority code of the form "<123>" into pri, and return the
* length of the priority code including the surrounding angle brackets.
*/
size_t
parsemsg_priority(const char *msg, int *pri)
{
size_t nlen;
char buf[11];
const char *errstr;
int maybepri;
if (*msg++ == '<') {
nlen = strspn(msg, "1234567890");
if (nlen > 0 && nlen < sizeof(buf) && msg[nlen] == '>') {
strlcpy(buf, msg, nlen + 1);
maybepri = strtonum(buf, 0, INT_MAX, &errstr);
if (errstr == NULL) {
*pri = maybepri;
return nlen + 2;
}
}
}
return 0;
}
size_t
parsemsg_timestamp_bsd(const char *msg, char *timestamp)
{
size_t i;
timestamp[0] = '\0';
for (i = 0; i < 16; i++) {
if (msg[i] == '\0')
return 0;
}
if (msg[3] == ' ' && msg[6] == ' ' && msg[9] == ':' && msg[12] == ':' &&
msg[15] == ' ') {
/* BSD syslog TIMESTAMP, RFC 3164 */
if (!ZuluTime)
strlcpy(timestamp, msg, 16);
return 16;
}
return 0;
}
size_t
parsemsg_timestamp_v1(const char *msgstr, char *timestamp)
{
const char *msg;
size_t msglen, i;
for (msglen = 0; msglen < 33; msglen++) {
if(msgstr[msglen] == '\0')
break;
}
msg = msgstr;
timestamp[0] = '\0';
if (msglen >= 20 &&
isdigit(msg[0]) && isdigit(msg[1]) && isdigit(msg[2]) &&
isdigit(msg[3]) && msg[4] == '-' &&
isdigit(msg[5]) && isdigit(msg[6]) && msg[7] == '-' &&
isdigit(msg[8]) && isdigit(msg[9]) && msg[10] == 'T' &&
isdigit(msg[11]) && isdigit(msg[12]) && msg[13] == ':' &&
isdigit(msg[14]) && isdigit(msg[15]) && msg[16] == ':' &&
isdigit(msg[17]) && isdigit(msg[18]) && (msg[19] == '.' ||
msg[19] == 'Z' || msg[19] == '+' || msg[19] == '-')) {
/* FULL-DATE "T" FULL-TIME, RFC 5424 */
strlcpy(timestamp, msg, 33);
msg += 19;
msglen -= 19;
i = 0;
if (msglen >= 3 && msg[0] == '.' && isdigit(msg[1])) {
/* TIME-SECFRAC */
msg += 2;
msglen -= 2;
i += 2;
while(i < 7 && msglen >= 1 && isdigit(msg[0])) {
msg++;
msglen--;
i++;
}
}
if (msglen >= 2 && msg[0] == 'Z' && msg[1] == ' ') {
/* "Z" */
timestamp[20+i] = '\0';
msg += 2;
} else if (msglen >= 7 &&
(msg[0] == '+' || msg[0] == '-') &&
isdigit(msg[1]) && isdigit(msg[2]) &&
msg[3] == ':' &&
isdigit(msg[4]) && isdigit(msg[5]) &&
msg[6] == ' ') {
/* TIME-NUMOFFSET */
timestamp[25+i] = '\0';
msg += 7;
} else {
/* invalid time format, roll back */
timestamp[0] = '\0';
return 0;
}
} else if (msglen >= 2 && msg[0] == '-' && msg[1] == ' ') {
/* NILVALUE, RFC 5424 */
msg += 2;
}
return msg - msgstr;
}
size_t
parsemsg_prog(const char *msg, char *prog)
{
size_t i;
for (i = 0; i < NAME_MAX; i++) {
if (!isalnum((unsigned char)msg[i]) &&
msg[i] != '-' && msg[i] != '.' && msg[i] != '_')
break;
prog[i] = msg[i];
}
prog[i] = '\0';
return i;
}
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