GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/syslogc/syslogc.c Lines: 49 72 68.1 %
Date: 2017-11-13 Branches: 34 49 69.4 %

Line Branch Exec Source
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/* $OpenBSD: syslogc.c,v 1.18 2015/10/13 16:30:55 deraadt Exp $ */
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/*
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 * Copyright (c) 2004 Damien Miller
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 *
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 * Permission to use, copy, modify, and distribute this software for any
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 * purpose with or without fee is hereby granted, provided that the above
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 * copyright notice and this permission notice appear in all copies.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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 */
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define DEFAULT_CTLSOCK		"/var/run/syslogd.sock"
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#define MAX_MEMBUF_NAME	64	/* Max length of membuf log name */
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/*
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 * Client protocol NB. all numeric fields in network byte order
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 */
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#define CTL_VERSION		2
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/* Request */
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struct ctl_cmd {
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	u_int32_t	version;
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#define CMD_READ	1	/* Read out log */
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#define CMD_READ_CLEAR	2	/* Read and clear log */
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#define CMD_CLEAR	3	/* Clear log */
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#define CMD_LIST	4	/* List available logs */
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#define CMD_FLAGS	5	/* Query flags only */
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#define CMD_READ_CONT	6	/* Read out log continuously */
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	u_int32_t	cmd;
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	u_int32_t	lines;
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	char		logname[MAX_MEMBUF_NAME];
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};
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/* Reply */
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struct ctl_reply_hdr {
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	u_int32_t	version;
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#define CTL_HDR_FLAG_OVERFLOW	0x01
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	u_int32_t	flags;
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	/* Reply text follows, up to MAX_MEMBUF long */
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};
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static void
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usage(void)
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{
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	extern char *__progname;
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	fprintf(stderr,
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	    "usage: %s [-Ccfo] [-n lines] [-s reporting_socket] logname\n"
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	    "       %s -q\n", __progname, __progname);
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	exit(1);
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}
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int
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main(int argc, char **argv)
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{
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	const char *ctlsock_path;
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	char buf[8192];
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	struct sockaddr_un ctl;
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	int ctlsock, ch, oflag, rval;
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	FILE *ctlf;
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	extern char *optarg;
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	extern int optind;
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	struct ctl_cmd cc;
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	struct ctl_reply_hdr rr;
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	const char *errstr;
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	memset(&cc, '\0', sizeof(cc));
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	ctlsock_path = DEFAULT_CTLSOCK;
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	rval = oflag = 0;
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	while ((ch = getopt(argc, argv, "Ccfhon:qs:")) != -1) {
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		switch (ch) {
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		case 'C':
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			cc.cmd = CMD_CLEAR;
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			break;
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		case 'c':
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			cc.cmd = CMD_READ_CLEAR;
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			break;
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		case 'h':
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			usage();
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			break;
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		case 'f':
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			cc.cmd = CMD_READ_CONT;
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			break;
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		case 'n':
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			cc.lines = strtonum(optarg, 1, UINT32_MAX, &errstr);
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			if (errstr)
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				errx(1, "number of lines is %s: %s",
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				    errstr, optarg);
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			break;
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		case 'o':
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			cc.cmd = CMD_FLAGS;
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			oflag = 1;
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			break;
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		case 'q':
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			cc.cmd = CMD_LIST;
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			break;
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		case 's':
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			ctlsock_path = optarg;
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			break;
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		default:
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			usage();
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			break;
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		}
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	}
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	if (cc.cmd == 0)
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		cc.cmd = CMD_READ;
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	if ((cc.cmd != CMD_LIST && optind != argc - 1) ||
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	    (cc.cmd == CMD_LIST && optind != argc))
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		usage();
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	if (cc.cmd != CMD_LIST) {
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		if (strlcpy(cc.logname, argv[optind], sizeof(cc.logname)) >=
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		    sizeof(cc.logname))
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			errx(1, "Specified log name is too long");
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	}
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	memset(&ctl, '\0', sizeof(ctl));
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	strlcpy(ctl.sun_path, ctlsock_path, sizeof(ctl.sun_path));
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	ctl.sun_family = AF_UNIX;
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	if ((ctlsock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
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		err(1, "socket");
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	if (connect(ctlsock, (struct sockaddr *)&ctl, sizeof(ctl)) == -1)
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		err(1, "connect: %s", ctl.sun_path);
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	if ((ctlf = fdopen(ctlsock, "r+")) == NULL)
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		err(1, "fdopen");
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	if (pledge("stdio flock rpath cpath wpath", NULL) == -1)
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		err(1, "stdio");
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	cc.version = htonl(CTL_VERSION);
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	cc.cmd = htonl(cc.cmd);
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	/* Send command */
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	if (fwrite(&cc, sizeof(cc), 1, ctlf) != 1)
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		err(1, "fwrite");
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	fflush(ctlf);
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	setvbuf(ctlf, NULL, _IOLBF, 0);
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	setvbuf(stdout, NULL, _IOLBF, 0);
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	/* Fetch header */
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	if (fread(&rr, sizeof(rr), 1, ctlf) != 1)
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		err(1, "fread header");
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	if (ntohl(rr.version) != CTL_VERSION)
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		errx(1, "unsupported syslogd version");
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	/* Write out reply */
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	while ((fgets(buf, sizeof(buf), ctlf)) != NULL) {
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		if (!strcmp(buf, "<ENOBUFS>\n"))
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			fprintf(stderr, "syslogc [%s]: Lines were dropped!\n",
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			    cc.logname);
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		else
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			fputs(buf, stdout);
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	}
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	if (oflag && (ntohl(rr.flags) & CTL_HDR_FLAG_OVERFLOW)) {
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		printf("%s has overflowed\n", cc.logname);
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		rval = 1;
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	}
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	fclose(ctlf);
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	close(ctlsock);
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	exit(rval);
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}