[ashd.git] / src / htparser.c

/*
    ashd - A Sane HTTP Daemon
    Copyright (C) 2008  Fredrik Tolf <fredrik@dolda2000.com>

    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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <pwd.h>
#include <errno.h>

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <utils.h>
#include <mt.h>
#include <mtio.h>
#include <log.h>
#include <req.h>
#include <proc.h>

#include "htparser.h"

static int plex;

static struct hthead *parsereq(FILE *in)
{
    struct hthead *req;
    struct charbuf method, url, ver;
    int c;
    
    req = NULL;
    bufinit(method);
    bufinit(url);
    bufinit(ver);
    while(1) {
	c = getc(in);
	if(c == ' ') {
	    break;
	} else if((c == EOF) || (c < 32) || (c >= 128)) {
	    goto fail;
	} else {
	    bufadd(method, c);
	}
    }
    while(1) {
	c = getc(in);
	if(c == ' ') {
	    break;
	} else if((c == EOF) || (c < 32)) {
	    goto fail;
	} else {
	    bufadd(url, c);
	}
    }
    while(1) {
	c = getc(in);
	if(c == 10) {
	    break;
	} else if(c == 13) {
	} else if((c == EOF) || (c < 32) || (c >= 128)) {
	    goto fail;
	} else {
	    bufadd(ver, c);
	}
    }
    bufadd(method, 0);
    bufadd(url, 0);
    bufadd(ver, 0);
    req = mkreq(method.b, url.b, ver.b);
    if(parseheaders(req, in))
	goto fail;
    goto out;
    
fail:
    if(req != NULL) {
	freehthead(req);
	req = NULL;
    }
out:
    buffree(method);
    buffree(url);
    buffree(ver);
    return(req);
}

static struct hthead *parseresp(FILE *in)
{
    struct hthead *req;
    int code;
    struct charbuf ver, msg;
    int c;
    
    req = NULL;
    bufinit(ver);
    bufinit(msg);
    code = 0;
    while(1) {
	c = getc(in);
	if(c == ' ') {
	    break;
	} else if((c == EOF) || (c < 32) || (c >= 128)) {
	    goto fail;
	} else {
	    bufadd(ver, c);
	}
    }
    while(1) {
	c = getc(in);
	if(c == ' ') {
	    break;
	} else if((c == EOF) || (c < '0') || (c > '9')) {
	    goto fail;
	} else {
	    code = (code * 10) + (c - '0');
	}
    }
    while(1) {
	c = getc(in);
	if(c == 10) {
	    break;
	} else if(c == 13) {
	} else if((c == EOF) || (c < 32)) {
	    goto fail;
	} else {
	    bufadd(msg, c);
	}
    }
    bufadd(msg, 0);
    bufadd(ver, 0);
    req = mkresp(code, msg.b, ver.b);
    if(parseheaders(req, in))
	goto fail;
    goto out;
    
fail:
    if(req != NULL) {
	freehthead(req);
	req = NULL;
    }
out:
    buffree(msg);
    buffree(ver);
    return(req);
}

static off_t passdata(FILE *in, FILE *out, off_t max)
{
    size_t read;
    off_t total;
    char buf[8192];
    
    total = 0;
    while(!feof(in) && ((max < 0) || (total < max))) {
	read = sizeof(buf);
	if(max >= 0)
	    read = min(max - total, read);
	read = fread(buf, 1, read, in);
	if(ferror(in))
	    return(-1);
	if(fwrite(buf, 1, read, out) != read)
	    return(-1);
	total += read;
    }
    return(total);
}

static int passchunks(FILE *in, FILE *out)
{
    char buf[8192];
    size_t read;
    
    do {
	read = fread(buf, 1, sizeof(buf), in);
	if(ferror(in))
	    return(-1);
	fprintf(out, "%zx\r\n", read);
	if(fwrite(buf, 1, read, out) != read)
	    return(-1);
	fprintf(out, "\r\n");
    } while(read > 0);
    return(0);
}

static int hasheader(struct hthead *head, char *name, char *val)
{
    char *hd;
    
    if((hd = getheader(head, name)) == NULL)
	return(0);
    return(!strcasecmp(hd, val));
}

void serve(FILE *in, struct conn *conn)
{
    int pfds[2];
    FILE *out;
    struct hthead *req, *resp;
    char *hd, *p;
    off_t dlen;
    
    out = NULL;
    req = resp = NULL;
    while(1) {
	if((req = parsereq(in)) == NULL)
	    break;
	replrest(req, req->url);
	if(req->rest[0] == '/')
	    replrest(req, req->rest + 1);
	if((p = strchr(req->rest, '?')) != NULL)
	    *p = 0;
	
	if((conn->initreq != NULL) && conn->initreq(conn, req))
	    break;
	
	if(block(plex, EV_WRITE, 60) <= 0)
	    break;
	if(socketpair(PF_UNIX, SOCK_STREAM, 0, pfds))
	    break;
	if(sendreq(plex, req, pfds[0]))
	    break;
	close(pfds[0]);
	out = mtstdopen(pfds[1], 1, 600, "r+");

	if((hd = getheader(req, "content-length")) != NULL) {
	    dlen = atoo(hd);
	    if(dlen > 0) {
		if(passdata(in, out, dlen) != dlen)
		    break;
	    }
	}
	if(fflush(out))
	    break;
	/* Make sure to send EOF */
	shutdown(pfds[1], SHUT_WR);
	
	if((resp = parseresp(out)) == NULL)
	    break;
	replstr(&resp->ver, req->ver);

	if(!strcmp(req->ver, "HTTP/1.0")) {
	    writeresp(in, resp);
	    fprintf(in, "\r\n");
	    if((hd = getheader(resp, "content-length")) != NULL) {
		dlen = passdata(out, in, -1);
		if(dlen != atoo(hd))
		    break;
		if(!hasheader(req, "connection", "keep-alive"))
		    break;
	    } else {
		passdata(out, in, -1);
		break;
	    }
	    if(hasheader(req, "connection", "close") || hasheader(resp, "connection", "close"))
		break;
	} else if(!strcmp(req->ver, "HTTP/1.1")) {
	    if((hd = getheader(resp, "content-length")) != NULL) {
		writeresp(in, resp);
		fprintf(in, "\r\n");
		dlen = passdata(out, in, -1);
		if(dlen != atoo(hd))
		    break;
	    } else if(!getheader(resp, "transfer-encoding")) {
		headappheader(resp, "Transfer-Encoding", "chunked");
		writeresp(in, resp);
		fprintf(in, "\r\n");
		if(passchunks(out, in))
		    break;
	    } else {
		writeresp(in, resp);
		fprintf(in, "\r\n");
		passdata(out, in, -1);
		break;
	    }
	    if(hasheader(req, "connection", "close") || hasheader(resp, "connection", "close"))
		break;
	} else {
	    break;
	}

	fclose(out);
	out = NULL;
	freehthead(req);
	freehthead(resp);
	req = resp = NULL;
    }
    
    if(out != NULL)
	fclose(out);
    if(req != NULL)
	freehthead(req);
    if(resp != NULL)
	freehthead(resp);
    fclose(in);
}

static void plexwatch(struct muth *muth, va_list args)
{
    vavar(int, fd);
    char *buf;
    int ret;
    
    while(1) {
	block(fd, EV_READ, 0);
	buf = smalloc(65536);
	ret = recv(fd, buf, 65536, 0);
	if(ret < 0) {
	    flog(LOG_WARNING, "received error on rootplex read channel: %s", strerror(errno));
	    exit(1);
	} else if(ret == 0) {
	    exit(0);
	}
	/* Maybe I'd like to implement some protocol in this direction
	 * some day... */
	free(buf);
    }
}

static void usage(FILE *out)
{
    fprintf(out, "usage: htparser [-hSf] [-u USER] [-r ROOT] PORTSPEC... -- ROOT [ARGS...]\n");
    fprintf(out, "\twhere PORTSPEC is HANDLER[:PAR[=VAL][(,PAR[=VAL])...]] (try HANDLER:help)\n");
    fprintf(out, "\tavailable handlers are `plain'.\n");
}

static void addport(char *spec)
{
    char *nm, *p, *p2, *n;
    struct charvbuf pars, vals;
    
    bufinit(pars);
    bufinit(vals);
    if((p = strchr(spec, ':')) == NULL) {
	nm = spec;
    } else {
	nm = spec;
	*(p++) = 0;
	do {
	    if((n = strchr(p, ',')) != NULL)
		*(n++) = 0;
	    if((p2 = strchr(p, '=')) != NULL)
		*(p2++) = 0;
	    if(!*p) {
		usage(stderr);
		exit(1);
	    }
	    bufadd(pars, p);
	    if(p2)
		bufadd(vals, p2);
	    else
		bufadd(vals, "");
	} while((p = n) != NULL);
    }
    
    /* XXX: It would be nice to decentralize this, but, meh... */
    if(!strcmp(nm, "plain")) {
	handleplain(pars.d, pars.b, vals.b);
    } else {
	flog(LOG_ERR, "htparser: unknown port handler `%s'", nm);
	exit(1);
    }
    
    buffree(pars);
    buffree(vals);
}

int main(int argc, char **argv)
{
    int c;
    int i, s1;
    int daemonize, logsys;
    char *root;
    struct passwd *pwent;
    
    daemonize = logsys = 0;
    root = NULL;
    pwent = NULL;
    while((c = getopt(argc, argv, "+hSfu:r:")) >= 0) {
	switch(c) {
	case 'h':
	    usage(stdout);
	    exit(0);
	case 'f':
	    daemonize = 1;
	    break;
	case 'S':
	    logsys = 1;
	    break;
	case 'u':
	    if((pwent = getpwnam(optarg)) == NULL) {
		flog(LOG_ERR, "could not find user %s", optarg);
		exit(1);
	    }
	    break;
	case 'r':
	    root = optarg;
	    break;
	default:
	    usage(stderr);
	    exit(1);
	}
    }
    s1 = 0;
    for(i = optind; i < argc; i++) {
	if(!strcmp(argv[i], "--"))
	    break;
	s1 = 1;
	addport(argv[i]);
    }
    if(!s1 || (i == argc)) {
	usage(stderr);
	exit(1);
    }
    if((plex = stdmkchild(argv + ++i)) < 0) {
	flog(LOG_ERR, "could not spawn root multiplexer: %s", strerror(errno));
	return(1);
    }
    mustart(plexwatch, plex);
    if(logsys)
	opensyslog();
    if(root) {
	if(chroot(root)) {
	    flog(LOG_ERR, "could not chroot to %s: %s", root, strerror(errno));
	    exit(1);
	}
    }
    if(pwent) {
	if(setgid(pwent->pw_gid)) {
	    flog(LOG_ERR, "could not switch group to %i: %s", (int)pwent->pw_gid, strerror(errno));
	    exit(1);
	}
	if(setuid(pwent->pw_uid)) {
	    flog(LOG_ERR, "could not switch user to %i: %s", (int)pwent->pw_uid, strerror(errno));
	    exit(1);
	}
    }
    if(daemonize) {
	daemon(0, 0);
    }
    ioloop();
    return(0);
}
Commit	Line	Data
	1	/*
	2	ashd - A Sane HTTP Daemon
	3	Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com>
	4
	5	This program is free software: you can redistribute it and/or modify
	6	it under the terms of the GNU General Public License as published by
	7	the Free Software Foundation, either version 3 of the License, or
	8	(at your option) any later version.
	9
	10	This program is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	GNU General Public License for more details.
	14
	15	You should have received a copy of the GNU General Public License
	16	along with this program. If not, see <http://www.gnu.org/licenses/>.
	17	*/
	18
	19	#include <stdlib.h>
	20	#include <unistd.h>
	21	#include <stdio.h>
	22	#include <string.h>
	23	#include <sys/socket.h>
	24	#include <pwd.h>
	25	#include <errno.h>
	26
	27	#ifdef HAVE_CONFIG_H
	28	#include <config.h>
	29	#endif
	30	#include <utils.h>
	31	#include <mt.h>
	32	#include <mtio.h>
	33	#include <log.h>
	34	#include <req.h>
	35	#include <proc.h>
	36
	37	#include "htparser.h"
	38
	39	static int plex;
	40
	41	static struct hthead parsereq(FILE in)
	42	{
	43	struct hthead *req;
	44	struct charbuf method, url, ver;
	45	int c;
	46
	47	req = NULL;
	48	bufinit(method);
	49	bufinit(url);
	50	bufinit(ver);
	51	while(1) {
	52	c = getc(in);
	53	if(c == ' ') {
	54	break;
	55	} else if((c == EOF) \|\| (c < 32) \|\| (c >= 128)) {
	56	goto fail;
	57	} else {
	58	bufadd(method, c);
	59	}
	60	}
	61	while(1) {
	62	c = getc(in);
	63	if(c == ' ') {
	64	break;
	65	} else if((c == EOF) \|\| (c < 32)) {
	66	goto fail;
	67	} else {
	68	bufadd(url, c);
	69	}
	70	}
	71	while(1) {
	72	c = getc(in);
	73	if(c == 10) {
	74	break;
	75	} else if(c == 13) {
	76	} else if((c == EOF) \|\| (c < 32) \|\| (c >= 128)) {
	77	goto fail;
	78	} else {
	79	bufadd(ver, c);
	80	}
	81	}
	82	bufadd(method, 0);
	83	bufadd(url, 0);
	84	bufadd(ver, 0);
	85	req = mkreq(method.b, url.b, ver.b);
	86	if(parseheaders(req, in))
	87	goto fail;
	88	goto out;
	89
	90	fail:
	91	if(req != NULL) {
	92	freehthead(req);
	93	req = NULL;
	94	}
	95	out:
	96	buffree(method);
	97	buffree(url);
	98	buffree(ver);
	99	return(req);
	100	}
	101
	102	static struct hthead parseresp(FILE in)
	103	{
	104	struct hthead *req;
	105	int code;
	106	struct charbuf ver, msg;
	107	int c;
	108
	109	req = NULL;
	110	bufinit(ver);
	111	bufinit(msg);
	112	code = 0;
	113	while(1) {
	114	c = getc(in);
	115	if(c == ' ') {
	116	break;
	117	} else if((c == EOF) \|\| (c < 32) \|\| (c >= 128)) {
	118	goto fail;
	119	} else {
	120	bufadd(ver, c);
	121	}
	122	}
	123	while(1) {
	124	c = getc(in);
	125	if(c == ' ') {
	126	break;
	127	} else if((c == EOF) \|\| (c < '0') \|\| (c > '9')) {
	128	goto fail;
	129	} else {
	130	code = (code * 10) + (c - '0');
	131	}
	132	}
	133	while(1) {
	134	c = getc(in);
	135	if(c == 10) {
	136	break;
	137	} else if(c == 13) {
	138	} else if((c == EOF) \|\| (c < 32)) {
	139	goto fail;
	140	} else {
	141	bufadd(msg, c);
	142	}
	143	}
	144	bufadd(msg, 0);
	145	bufadd(ver, 0);
	146	req = mkresp(code, msg.b, ver.b);
	147	if(parseheaders(req, in))
	148	goto fail;
	149	goto out;
	150
	151	fail:
	152	if(req != NULL) {
	153	freehthead(req);
	154	req = NULL;
	155	}
	156	out:
	157	buffree(msg);
	158	buffree(ver);
	159	return(req);
	160	}
	161
	162	static off_t passdata(FILE in, FILE out, off_t max)
	163	{
	164	size_t read;
	165	off_t total;
	166	char buf[8192];
	167
	168	total = 0;
	169	while(!feof(in) && ((max < 0) \|\| (total < max))) {
	170	read = sizeof(buf);
	171	if(max >= 0)
	172	read = min(max - total, read);
	173	read = fread(buf, 1, read, in);
	174	if(ferror(in))
	175	return(-1);
	176	if(fwrite(buf, 1, read, out) != read)
	177	return(-1);
	178	total += read;
	179	}
	180	return(total);
	181	}
	182
	183	static int passchunks(FILE in, FILE out)
	184	{
	185	char buf[8192];
	186	size_t read;
	187
	188	do {
	189	read = fread(buf, 1, sizeof(buf), in);
	190	if(ferror(in))
	191	return(-1);
	192	fprintf(out, "%zx\r\n", read);
	193	if(fwrite(buf, 1, read, out) != read)
	194	return(-1);
	195	fprintf(out, "\r\n");
	196	} while(read > 0);
	197	return(0);
	198	}
	199
	200	static int hasheader(struct hthead head, char name, char *val)
	201	{
	202	char *hd;
	203
	204	if((hd = getheader(head, name)) == NULL)
	205	return(0);
	206	return(!strcasecmp(hd, val));
	207	}
	208
	209	void serve(FILE in, struct conn conn)
	210	{
	211	int pfds[2];
	212	FILE *out;
	213	struct hthead req, resp;
	214	char hd, p;
	215	off_t dlen;
	216
	217	out = NULL;
	218	req = resp = NULL;
	219	while(1) {
	220	if((req = parsereq(in)) == NULL)
	221	break;
	222	replrest(req, req->url);
	223	if(req->rest[0] == '/')
	224	replrest(req, req->rest + 1);
	225	if((p = strchr(req->rest, '?')) != NULL)
	226	*p = 0;
	227
	228	if((conn->initreq != NULL) && conn->initreq(conn, req))
	229	break;
	230
	231	if(block(plex, EV_WRITE, 60) <= 0)
	232	break;
	233	if(socketpair(PF_UNIX, SOCK_STREAM, 0, pfds))
	234	break;
	235	if(sendreq(plex, req, pfds[0]))
	236	break;
	237	close(pfds[0]);
	238	out = mtstdopen(pfds[1], 1, 600, "r+");
	239
	240	if((hd = getheader(req, "content-length")) != NULL) {
	241	dlen = atoo(hd);
	242	if(dlen > 0) {
	243	if(passdata(in, out, dlen) != dlen)
	244	break;
	245	}
	246	}
	247	if(fflush(out))
	248	break;
	249	/* Make sure to send EOF */
	250	shutdown(pfds[1], SHUT_WR);
	251
	252	if((resp = parseresp(out)) == NULL)
	253	break;
	254	replstr(&resp->ver, req->ver);
	255
	256	if(!strcmp(req->ver, "HTTP/1.0")) {
	257	writeresp(in, resp);
	258	fprintf(in, "\r\n");
	259	if((hd = getheader(resp, "content-length")) != NULL) {
	260	dlen = passdata(out, in, -1);
	261	if(dlen != atoo(hd))
	262	break;
	263	if(!hasheader(req, "connection", "keep-alive"))
	264	break;
	265	} else {
	266	passdata(out, in, -1);
	267	break;
	268	}
	269	if(hasheader(req, "connection", "close") \|\| hasheader(resp, "connection", "close"))
	270	break;
	271	} else if(!strcmp(req->ver, "HTTP/1.1")) {
	272	if((hd = getheader(resp, "content-length")) != NULL) {
	273	writeresp(in, resp);
	274	fprintf(in, "\r\n");
	275	dlen = passdata(out, in, -1);
	276	if(dlen != atoo(hd))
	277	break;
	278	} else if(!getheader(resp, "transfer-encoding")) {
	279	headappheader(resp, "Transfer-Encoding", "chunked");
	280	writeresp(in, resp);
	281	fprintf(in, "\r\n");
	282	if(passchunks(out, in))
	283	break;
	284	} else {
	285	writeresp(in, resp);
	286	fprintf(in, "\r\n");
	287	passdata(out, in, -1);
	288	break;
	289	}
	290	if(hasheader(req, "connection", "close") \|\| hasheader(resp, "connection", "close"))
	291	break;
	292	} else {
	293	break;
	294	}
	295
	296	fclose(out);
	297	out = NULL;
	298	freehthead(req);
	299	freehthead(resp);
	300	req = resp = NULL;
	301	}
	302
	303	if(out != NULL)
	304	fclose(out);
	305	if(req != NULL)
	306	freehthead(req);
	307	if(resp != NULL)
	308	freehthead(resp);
	309	fclose(in);
	310	}
	311
	312	static void plexwatch(struct muth *muth, va_list args)
	313	{
	314	vavar(int, fd);
	315	char *buf;
	316	int ret;
	317
	318	while(1) {
	319	block(fd, EV_READ, 0);
	320	buf = smalloc(65536);
	321	ret = recv(fd, buf, 65536, 0);
	322	if(ret < 0) {
	323	flog(LOG_WARNING, "received error on rootplex read channel: %s", strerror(errno));
	324	exit(1);
	325	} else if(ret == 0) {
	326	exit(0);
	327	}
	328	/* Maybe I'd like to implement some protocol in this direction
	329	* some day... */
	330	free(buf);
	331	}
	332	}
	333
	334	static void usage(FILE *out)
	335	{
	336	fprintf(out, "usage: htparser [-hSf] [-u USER] [-r ROOT] PORTSPEC... -- ROOT [ARGS...]\n");
	337	fprintf(out, "\twhere PORTSPEC is HANDLER[:PAR[=VAL][(,PAR[=VAL])...]] (try HANDLER:help)\n");
	338	fprintf(out, "\tavailable handlers are `plain'.\n");
	339	}
	340
	341	static void addport(char *spec)
	342	{
	343	char nm, p, p2, n;
	344	struct charvbuf pars, vals;
	345
	346	bufinit(pars);
	347	bufinit(vals);
	348	if((p = strchr(spec, ':')) == NULL) {
	349	nm = spec;
	350	} else {
	351	nm = spec;
	352	*(p++) = 0;
	353	do {
	354	if((n = strchr(p, ',')) != NULL)
	355	*(n++) = 0;
	356	if((p2 = strchr(p, '=')) != NULL)
	357	*(p2++) = 0;
	358	if(!*p) {
	359	usage(stderr);
	360	exit(1);
	361	}
	362	bufadd(pars, p);
	363	if(p2)
	364	bufadd(vals, p2);
	365	else
	366	bufadd(vals, "");
	367	} while((p = n) != NULL);
	368	}
	369
	370	/* XXX: It would be nice to decentralize this, but, meh... */
	371	if(!strcmp(nm, "plain")) {
	372	handleplain(pars.d, pars.b, vals.b);
	373	} else {
	374	flog(LOG_ERR, "htparser: unknown port handler `%s'", nm);
	375	exit(1);
	376	}
	377
	378	buffree(pars);
	379	buffree(vals);
	380	}
	381
	382	int main(int argc, char **argv)
	383	{
	384	int c;
	385	int i, s1;
	386	int daemonize, logsys;
	387	char *root;
	388	struct passwd *pwent;
	389
	390	daemonize = logsys = 0;
	391	root = NULL;
	392	pwent = NULL;
	393	while((c = getopt(argc, argv, "+hSfu:r:")) >= 0) {
	394	switch(c) {
	395	case 'h':
	396	usage(stdout);
	397	exit(0);
	398	case 'f':
	399	daemonize = 1;
	400	break;
	401	case 'S':
	402	logsys = 1;
	403	break;
	404	case 'u':
	405	if((pwent = getpwnam(optarg)) == NULL) {
	406	flog(LOG_ERR, "could not find user %s", optarg);
	407	exit(1);
	408	}
	409	break;
	410	case 'r':
	411	root = optarg;
	412	break;
	413	default:
	414	usage(stderr);
	415	exit(1);
	416	}
	417	}
	418	s1 = 0;
	419	for(i = optind; i < argc; i++) {
	420	if(!strcmp(argv[i], "--"))
	421	break;
	422	s1 = 1;
	423	addport(argv[i]);
	424	}
	425	if(!s1 \|\| (i == argc)) {
	426	usage(stderr);
	427	exit(1);
	428	}
	429	if((plex = stdmkchild(argv + ++i)) < 0) {
	430	flog(LOG_ERR, "could not spawn root multiplexer: %s", strerror(errno));
	431	return(1);
	432	}
	433	mustart(plexwatch, plex);
	434	if(logsys)
	435	opensyslog();
	436	if(root) {
	437	if(chroot(root)) {
	438	flog(LOG_ERR, "could not chroot to %s: %s", root, strerror(errno));
	439	exit(1);
	440	}
	441	}
	442	if(pwent) {
	443	if(setgid(pwent->pw_gid)) {
	444	flog(LOG_ERR, "could not switch group to %i: %s", (int)pwent->pw_gid, strerror(errno));
	445	exit(1);
	446	}
	447	if(setuid(pwent->pw_uid)) {
	448	flog(LOG_ERR, "could not switch user to %i: %s", (int)pwent->pw_uid, strerror(errno));
	449	exit(1);
	450	}
	451	}
	452	if(daemonize) {
	453	daemon(0, 0);
	454	}
	455	ioloop();
	456	return(0);
	457	}