[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 <fcntl.h>
#include <string.h>
#include <sys/socket.h>
#include <pwd.h>
#include <sys/signal.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 char *pidfile = NULL;
static int daemonize, usesyslog;
struct mtbuf listeners;

static void trimx(struct hthead *req)
{
    int i;
    
    i = 0;
    while(i < req->noheaders) {
	if(!strncasecmp(req->headers[i][0], "x-ash-", 6)) {
	    free(req->headers[i][0]);
	    free(req->headers[i][1]);
	    free(req->headers[i]);
	    memmove(req->headers + i, req->headers + i + 1, sizeof(*req->headers) * (--req->noheaders - i));
	} else {
	    i++;
	}
    }
}

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);
	    if(method.d >= 128)
		goto fail;
	}
    }
    while(1) {
	c = getc(in);
	if(c == ' ') {
	    break;
	} else if((c == EOF) || (c < 32)) {
	    goto fail;
	} else {
	    bufadd(url, c);
	    if(url.d >= 65536)
		goto fail;
	}
    }
    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);
	    if(ver.d >= 128)
		goto fail;
	}
    }
    bufadd(method, 0);
    bufadd(url, 0);
    bufadd(ver, 0);
    req = mkreq(method.b, url.b, ver.b);
    if(parseheaders(req, in))
	goto fail;
    trimx(req);
    goto out;
    
fail:
    if(req != NULL) {
	freehthead(req);
	req = NULL;
    }
out:
    buffree(method);
    buffree(url);
    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 recvchunks(FILE *in, FILE *out)
{
    char buf[8192];
    size_t read, chlen;
    int c, r;
    
    while(1) {
	chlen = 0;
	r = 0;
	while(1) {
	    c = getc(in);
	    if(c == 10) {
		if(!r)
		    return(-1);
		break;
	    } else if(c == 13) {
	    } else if((c >= '0') && (c <= '9')) {
		chlen = (chlen << 4) + (c - '0');
		r = 1;
	    } else if((c >= 'A') && (c <= 'F')) {
		chlen = (chlen << 4) + (c + 10 - 'A');
		r = 1;
	    } else if((c >= 'a') && (c <= 'f')) {
		chlen = (chlen << 4) + (c + 10 - 'a');
		r = 1;
	    } else {
		/* XXX: Technically, there may be chunk extensions to
		 * be read, but since that will likely never actually
		 * happen in practice, I can just as well add support
		 * for that if it actually does become relevant. */
		return(-1);
	    }
	}
	if(chlen == 0)
	    break;
	while(chlen > 0) {
	    read = fread(buf, 1, min(sizeof(buf), chlen), in);
	    if(feof(in) || ferror(in))
		return(-1);
	    if(fwrite(buf, 1, read, out) != read)
		return(-1);
	    chlen -= read;
	}
	if((getc(in) != 13) || (getc(in) != 10))
	    return(-1);
    }
    /* XXX: Technically, there may be trailers to be read, but that's
     * just about as likely as chunk extensions. */
    if((getc(in) != 13) || (getc(in) != 10))
	return(-1);
    return(0);
}

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));
}

static int canonreq(struct hthead *req)
{
    char *p, *p2, *r;
    int n;

    if(req->url[0] == '/') {
	replrest(req, req->url + 1);
	if((p = strchr(req->rest, '?')) != NULL)
	    *p = 0;
	return(1);
    }
    if((p = strstr(req->url, "://")) != NULL) {
	n = p - req->url;
	if(((n == 4) && !strncasecmp(req->url, "http", 4)) ||
	   ((n == 5) && !strncasecmp(req->url, "https", 5))) {
	    if(getheader(req, "host"))
		return(0);
	    p += 3;
	    if((p2 = strchr(p, '/')) == NULL) {
		headappheader(req, "Host", p);
		free(req->url);
		req->url = sstrdup("/");
	    } else {
		r = sstrdup(p2);
		*(p2++) = 0;
		headappheader(req, "Host", p);
		free(req->url);
		req->url = r;
	    }
	    replrest(req, req->url + 1);
	    if((p = strchr(req->rest, '?')) != NULL)
		*p = 0;
	    return(1);
	}
    }
    return(0);
}

static int http10keep(struct hthead *req, struct hthead *resp)
{
    int fc;
    
    fc = hasheader(resp, "connection", "close");
    headrmheader(resp, "connection");
    if(!fc && hasheader(req, "connection", "keep-alive")) {
	headappheader(resp, "Connection", "Keep-Alive");
	return(1);
    } else {
	return(0);
    }
}

void serve(FILE *in, struct conn *conn)
{
    int pfds[2];
    FILE *out;
    struct hthead *req, *resp;
    char *hd;
    off_t dlen;
    int keep;
    
    out = NULL;
    req = resp = NULL;
    while(plex >= 0) {
	if((req = parsereq(in)) == NULL)
	    break;
	if(!canonreq(req))
	    break;
	
	if((conn->initreq != NULL) && conn->initreq(conn, req))
	    break;
	
	if((plex < 0) || 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(getheader(req, "content-type") != NULL) {
	    if((hd = getheader(req, "content-length")) != NULL) {
		dlen = atoo(hd);
		if(dlen > 0) {
		    if(passdata(in, out, dlen) != dlen)
			break;
		}
	    } else if(((hd = getheader(req, "transfer-encoding")) != NULL) && !strcasecmp(hd, "chunked")) {
		if(recvchunks(in, out))
		    break;
	    } else {
		/* Ignore rather than abort, to be kinder to broken clients. */
		headrmheader(req, "content-type");
	    }
	}
	if(fflush(out))
	    break;
	/* Make sure to send EOF */
	shutdown(pfds[1], SHUT_WR);
	
	if((resp = parseresponse(out)) == NULL)
	    break;
	replstr(&resp->ver, req->ver);
	
	if(!getheader(resp, "server"))
	    headappheader(resp, "Server", sprintf3("ashd/%s", VERSION));

	if(!strcasecmp(req->ver, "HTTP/1.0")) {
	    if(!strcasecmp(req->method, "head")) {
		keep = http10keep(req, resp);
		writeresp(in, resp);
		fprintf(in, "\r\n");
	    } else if((hd = getheader(resp, "content-length")) != NULL) {
		keep = http10keep(req, resp);
		dlen = atoo(hd);
		writeresp(in, resp);
		fprintf(in, "\r\n");
		if(passdata(out, in, dlen) != dlen)
		    break;
	    } else {
		headrmheader(resp, "connection");
		writeresp(in, resp);
		fprintf(in, "\r\n");
		passdata(out, in, -1);
		break;
	    }
	    if(!keep)
		break;
	} else if(!strcasecmp(req->ver, "HTTP/1.1")) {
	    if(!strcasecmp(req->method, "head")) {
		writeresp(in, resp);
		fprintf(in, "\r\n");
	    } else if((hd = getheader(resp, "content-length")) != NULL) {
		writeresp(in, resp);
		fprintf(in, "\r\n");
		dlen = atoo(hd);
		if(passdata(out, in, dlen) != dlen)
		    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 i, ret;
    
    while(1) {
	if(block(fd, EV_READ, 0) == 0)
	    break;
	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) {
	    free(buf);
	    break;
	}
	/* Maybe I'd like to implement some protocol in this direction
	 * some day... */
	free(buf);
    }
    close(plex);
    plex = -1;
    for(i = 0; i < listeners.d; i++) {
	if(listeners.b[i] == muth)
	    bufdel(listeners, i);
    }
    flog(LOG_INFO, "root handler exited, so shutting down listening...");
    while(listeners.d > 0)
	resume(listeners.b[0], 0);
}

static void initroot(void *uu)
{
    int fd;
    
    setsid();
    if(daemonize) {
	chdir("/");
	if((fd = open("/dev/null", O_RDWR)) >= 0) {
	    dup2(fd, 0);
	    dup2(fd, 1);
	    dup2(fd, 2);
	    close(fd);
	}
    }
    if(usesyslog)
	putenv("ASHD_USESYSLOG=1");
    else
	unsetenv("ASHD_USESYSLOG");
}

static void usage(FILE *out)
{
    fprintf(out, "usage: htparser [-hSf] [-u USER] [-r ROOT] [-p PIDFILE] PORTSPEC... -- ROOT [ARGS...]\n");
    fprintf(out, "\twhere PORTSPEC is HANDLER[:PAR[=VAL][(,PAR[=VAL])...]] (try HANDLER:help)\n");
    fprintf(out, "\tavailable handlers are `plain' and `ssl'.\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);
#ifdef HAVE_GNUTLS
    } else if(!strcmp(nm, "ssl")) {
	handlegnussl(pars.d, pars.b, vals.b);
#endif
    } else {
	flog(LOG_ERR, "htparser: unknown port handler `%s'", nm);
	exit(1);
    }
    
    buffree(pars);
    buffree(vals);
}

static void sighandler(int sig)
{
    exitioloop(1);
}

int main(int argc, char **argv)
{
    int c, d;
    int i, s1;
    char *root;
    FILE *pidout;
    struct passwd *pwent;
    
    daemonize = usesyslog = 0;
    root = NULL;
    pwent = NULL;
    while((c = getopt(argc, argv, "+hSfu:r:p:")) >= 0) {
	switch(c) {
	case 'h':
	    usage(stdout);
	    exit(0);
	case 'f':
	    daemonize = 1;
	    break;
	case 'S':
	    usesyslog = 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;
	case 'p':
	    pidfile = 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, initroot, NULL)) < 0) {
	flog(LOG_ERR, "could not spawn root multiplexer: %s", strerror(errno));
	return(1);
    }
    bufadd(listeners, mustart(plexwatch, plex));
    pidout = NULL;
    if(pidfile != NULL) {
	if((pidout = fopen(pidfile, "w")) == NULL) {
	    flog(LOG_ERR, "could not open %s for writing: %s", pidfile, strerror(errno));
	    return(1);
	}
    }
    if(usesyslog)
	opensyslog();
    if(root) {
	if(chdir(root) || 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);
	}
    }
    signal(SIGPIPE, SIG_IGN);
    signal(SIGCHLD, SIG_IGN);
    signal(SIGINT, sighandler);
    signal(SIGTERM, sighandler);
    if(daemonize) {
	daemon(0, 0);
    }
    if(pidout != NULL) {
	fprintf(pidout, "%i\n", getpid());
	fclose(pidout);
    }
    d = 0;
    while(!d) {
	switch(ioloop()) {
	case 0:
	    d = 1;
	    break;
	case 1:
	    if(listeners.d > 0) {
		while(listeners.d > 0)
		    resume(listeners.b[0], 0);
		flog(LOG_INFO, "no longer listening");
	    } else {
		d = 1;
	    }
	    break;
	}
    }
    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 <fcntl.h>
	23	#include <string.h>
	24	#include <sys/socket.h>
	25	#include <pwd.h>
	26	#include <sys/signal.h>
	27	#include <errno.h>
	28
	29	#ifdef HAVE_CONFIG_H
	30	#include <config.h>
	31	#endif
	32	#include <utils.h>
	33	#include <mt.h>
	34	#include <mtio.h>
	35	#include <log.h>
	36	#include <req.h>
	37	#include <proc.h>
	38
	39	#include "htparser.h"
	40
	41	static int plex;
	42	static char *pidfile = NULL;
	43	static int daemonize, usesyslog;
	44	struct mtbuf listeners;
	45
	46	static void trimx(struct hthead *req)
	47	{
	48	int i;
	49
	50	i = 0;
	51	while(i < req->noheaders) {
	52	if(!strncasecmp(req->headers[i][0], "x-ash-", 6)) {
	53	free(req->headers[i][0]);
	54	free(req->headers[i][1]);
	55	free(req->headers[i]);
	56	memmove(req->headers + i, req->headers + i + 1, sizeof(req->headers) (--req->noheaders - i));
	57	} else {
	58	i++;
	59	}
	60	}
	61	}
	62
	63	static struct hthead parsereq(FILE in)
	64	{
	65	struct hthead *req;
	66	struct charbuf method, url, ver;
	67	int c;
	68
	69	req = NULL;
	70	bufinit(method);
	71	bufinit(url);
	72	bufinit(ver);
	73	while(1) {
	74	c = getc(in);
	75	if(c == ' ') {
	76	break;
	77	} else if((c == EOF) \|\| (c < 32) \|\| (c >= 128)) {
	78	goto fail;
	79	} else {
	80	bufadd(method, c);
	81	if(method.d >= 128)
	82	goto fail;
	83	}
	84	}
	85	while(1) {
	86	c = getc(in);
	87	if(c == ' ') {
	88	break;
	89	} else if((c == EOF) \|\| (c < 32)) {
	90	goto fail;
	91	} else {
	92	bufadd(url, c);
	93	if(url.d >= 65536)
	94	goto fail;
	95	}
	96	}
	97	while(1) {
	98	c = getc(in);
	99	if(c == 10) {
	100	break;
	101	} else if(c == 13) {
	102	} else if((c == EOF) \|\| (c < 32) \|\| (c >= 128)) {
	103	goto fail;
	104	} else {
	105	bufadd(ver, c);
	106	if(ver.d >= 128)
	107	goto fail;
	108	}
	109	}
	110	bufadd(method, 0);
	111	bufadd(url, 0);
	112	bufadd(ver, 0);
	113	req = mkreq(method.b, url.b, ver.b);
	114	if(parseheaders(req, in))
	115	goto fail;
	116	trimx(req);
	117	goto out;
	118
	119	fail:
	120	if(req != NULL) {
	121	freehthead(req);
	122	req = NULL;
	123	}
	124	out:
	125	buffree(method);
	126	buffree(url);
	127	buffree(ver);
	128	return(req);
	129	}
	130
	131	static off_t passdata(FILE in, FILE out, off_t max)
	132	{
	133	size_t read;
	134	off_t total;
	135	char buf[8192];
	136
	137	total = 0;
	138	while(!feof(in) && ((max < 0) \|\| (total < max))) {
	139	read = sizeof(buf);
	140	if(max >= 0)
	141	read = min(max - total, read);
	142	read = fread(buf, 1, read, in);
	143	if(ferror(in))
	144	return(-1);
	145	if(fwrite(buf, 1, read, out) != read)
	146	return(-1);
	147	total += read;
	148	}
	149	return(total);
	150	}
	151
	152	static int recvchunks(FILE in, FILE out)
	153	{
	154	char buf[8192];
	155	size_t read, chlen;
	156	int c, r;
	157
	158	while(1) {
	159	chlen = 0;
	160	r = 0;
	161	while(1) {
	162	c = getc(in);
	163	if(c == 10) {
	164	if(!r)
	165	return(-1);
	166	break;
	167	} else if(c == 13) {
	168	} else if((c >= '0') && (c <= '9')) {
	169	chlen = (chlen << 4) + (c - '0');
	170	r = 1;
	171	} else if((c >= 'A') && (c <= 'F')) {
	172	chlen = (chlen << 4) + (c + 10 - 'A');
	173	r = 1;
	174	} else if((c >= 'a') && (c <= 'f')) {
	175	chlen = (chlen << 4) + (c + 10 - 'a');
	176	r = 1;
	177	} else {
	178	/* XXX: Technically, there may be chunk extensions to
	179	* be read, but since that will likely never actually
	180	* happen in practice, I can just as well add support
	181	* for that if it actually does become relevant. */
	182	return(-1);
	183	}
	184	}
	185	if(chlen == 0)
	186	break;
	187	while(chlen > 0) {
	188	read = fread(buf, 1, min(sizeof(buf), chlen), in);
	189	if(feof(in) \|\| ferror(in))
	190	return(-1);
	191	if(fwrite(buf, 1, read, out) != read)
	192	return(-1);
	193	chlen -= read;
	194	}
	195	if((getc(in) != 13) \|\| (getc(in) != 10))
	196	return(-1);
	197	}
	198	/* XXX: Technically, there may be trailers to be read, but that's
	199	* just about as likely as chunk extensions. */
	200	if((getc(in) != 13) \|\| (getc(in) != 10))
	201	return(-1);
	202	return(0);
	203	}
	204
	205	static int passchunks(FILE in, FILE out)
	206	{
	207	char buf[8192];
	208	size_t read;
	209
	210	do {
	211	read = fread(buf, 1, sizeof(buf), in);
	212	if(ferror(in))
	213	return(-1);
	214	fprintf(out, "%zx\r\n", read);
	215	if(fwrite(buf, 1, read, out) != read)
	216	return(-1);
	217	fprintf(out, "\r\n");
	218	} while(read > 0);
	219	return(0);
	220	}
	221
	222	static int hasheader(struct hthead head, char name, char *val)
	223	{
	224	char *hd;
	225
	226	if((hd = getheader(head, name)) == NULL)
	227	return(0);
	228	return(!strcasecmp(hd, val));
	229	}
	230
	231	static int canonreq(struct hthead *req)
	232	{
	233	char p, p2, *r;
	234	int n;
	235
	236	if(req->url[0] == '/') {
	237	replrest(req, req->url + 1);
	238	if((p = strchr(req->rest, '?')) != NULL)
	239	*p = 0;
	240	return(1);
	241	}
	242	if((p = strstr(req->url, "://")) != NULL) {
	243	n = p - req->url;
	244	if(((n == 4) && !strncasecmp(req->url, "http", 4)) \|\|
	245	((n == 5) && !strncasecmp(req->url, "https", 5))) {
	246	if(getheader(req, "host"))
	247	return(0);
	248	p += 3;
	249	if((p2 = strchr(p, '/')) == NULL) {
	250	headappheader(req, "Host", p);
	251	free(req->url);
	252	req->url = sstrdup("/");
	253	} else {
	254	r = sstrdup(p2);
	255	*(p2++) = 0;
	256	headappheader(req, "Host", p);
	257	free(req->url);
	258	req->url = r;
	259	}
	260	replrest(req, req->url + 1);
	261	if((p = strchr(req->rest, '?')) != NULL)
	262	*p = 0;
	263	return(1);
	264	}
	265	}
	266	return(0);
	267	}
	268
	269	static int http10keep(struct hthead req, struct hthead resp)
	270	{
	271	int fc;
	272
	273	fc = hasheader(resp, "connection", "close");
	274	headrmheader(resp, "connection");
	275	if(!fc && hasheader(req, "connection", "keep-alive")) {
	276	headappheader(resp, "Connection", "Keep-Alive");
	277	return(1);
	278	} else {
	279	return(0);
	280	}
	281	}
	282
	283	void serve(FILE in, struct conn conn)
	284	{
	285	int pfds[2];
	286	FILE *out;
	287	struct hthead req, resp;
	288	char *hd;
	289	off_t dlen;
	290	int keep;
	291
	292	out = NULL;
	293	req = resp = NULL;
	294	while(plex >= 0) {
	295	if((req = parsereq(in)) == NULL)
	296	break;
	297	if(!canonreq(req))
	298	break;
	299
	300	if((conn->initreq != NULL) && conn->initreq(conn, req))
	301	break;
	302
	303	if((plex < 0) \|\| block(plex, EV_WRITE, 60) <= 0)
	304	break;
	305	if(socketpair(PF_UNIX, SOCK_STREAM, 0, pfds))
	306	break;
	307	if(sendreq(plex, req, pfds[0]))
	308	break;
	309	close(pfds[0]);
	310	out = mtstdopen(pfds[1], 1, 600, "r+");
	311
	312	if(getheader(req, "content-type") != NULL) {
	313	if((hd = getheader(req, "content-length")) != NULL) {
	314	dlen = atoo(hd);
	315	if(dlen > 0) {
	316	if(passdata(in, out, dlen) != dlen)
	317	break;
	318	}
	319	} else if(((hd = getheader(req, "transfer-encoding")) != NULL) && !strcasecmp(hd, "chunked")) {
	320	if(recvchunks(in, out))
	321	break;
	322	} else {
	323	/* Ignore rather than abort, to be kinder to broken clients. */
	324	headrmheader(req, "content-type");
	325	}
	326	}
	327	if(fflush(out))
	328	break;
	329	/* Make sure to send EOF */
	330	shutdown(pfds[1], SHUT_WR);
	331
	332	if((resp = parseresponse(out)) == NULL)
	333	break;
	334	replstr(&resp->ver, req->ver);
	335
	336	if(!getheader(resp, "server"))
	337	headappheader(resp, "Server", sprintf3("ashd/%s", VERSION));
	338
	339	if(!strcasecmp(req->ver, "HTTP/1.0")) {
	340	if(!strcasecmp(req->method, "head")) {
	341	keep = http10keep(req, resp);
	342	writeresp(in, resp);
	343	fprintf(in, "\r\n");
	344	} else if((hd = getheader(resp, "content-length")) != NULL) {
	345	keep = http10keep(req, resp);
	346	dlen = atoo(hd);
	347	writeresp(in, resp);
	348	fprintf(in, "\r\n");
	349	if(passdata(out, in, dlen) != dlen)
	350	break;
	351	} else {
	352	headrmheader(resp, "connection");
	353	writeresp(in, resp);
	354	fprintf(in, "\r\n");
	355	passdata(out, in, -1);
	356	break;
	357	}
	358	if(!keep)
	359	break;
	360	} else if(!strcasecmp(req->ver, "HTTP/1.1")) {
	361	if(!strcasecmp(req->method, "head")) {
	362	writeresp(in, resp);
	363	fprintf(in, "\r\n");
	364	} else if((hd = getheader(resp, "content-length")) != NULL) {
	365	writeresp(in, resp);
	366	fprintf(in, "\r\n");
	367	dlen = atoo(hd);
	368	if(passdata(out, in, dlen) != dlen)
	369	break;
	370	} else if(!getheader(resp, "transfer-encoding")) {
	371	headappheader(resp, "Transfer-Encoding", "chunked");
	372	writeresp(in, resp);
	373	fprintf(in, "\r\n");
	374	if(passchunks(out, in))
	375	break;
	376	} else {
	377	writeresp(in, resp);
	378	fprintf(in, "\r\n");
	379	passdata(out, in, -1);
	380	break;
	381	}
	382	if(hasheader(req, "connection", "close") \|\| hasheader(resp, "connection", "close"))
	383	break;
	384	} else {
	385	break;
	386	}
	387
	388	fclose(out);
	389	out = NULL;
	390	freehthead(req);
	391	freehthead(resp);
	392	req = resp = NULL;
	393	}
	394
	395	if(out != NULL)
	396	fclose(out);
	397	if(req != NULL)
	398	freehthead(req);
	399	if(resp != NULL)
	400	freehthead(resp);
	401	fclose(in);
	402	}
	403
	404	static void plexwatch(struct muth *muth, va_list args)
	405	{
	406	vavar(int, fd);
	407	char *buf;
	408	int i, ret;
	409
	410	while(1) {
	411	if(block(fd, EV_READ, 0) == 0)
	412	break;
	413	buf = smalloc(65536);
	414	ret = recv(fd, buf, 65536, 0);
	415	if(ret < 0) {
	416	flog(LOG_WARNING, "received error on rootplex read channel: %s", strerror(errno));
	417	exit(1);
	418	} else if(ret == 0) {
	419	free(buf);
	420	break;
	421	}
	422	/* Maybe I'd like to implement some protocol in this direction
	423	* some day... */
	424	free(buf);
	425	}
	426	close(plex);
	427	plex = -1;
	428	for(i = 0; i < listeners.d; i++) {
	429	if(listeners.b[i] == muth)
	430	bufdel(listeners, i);
	431	}
	432	flog(LOG_INFO, "root handler exited, so shutting down listening...");
	433	while(listeners.d > 0)
	434	resume(listeners.b[0], 0);
	435	}
	436
	437	static void initroot(void *uu)
	438	{
	439	int fd;
	440
	441	setsid();
	442	if(daemonize) {
	443	chdir("/");
	444	if((fd = open("/dev/null", O_RDWR)) >= 0) {
	445	dup2(fd, 0);
	446	dup2(fd, 1);
	447	dup2(fd, 2);
	448	close(fd);
	449	}
	450	}
	451	if(usesyslog)
	452	putenv("ASHD_USESYSLOG=1");
	453	else
	454	unsetenv("ASHD_USESYSLOG");
	455	}
	456
	457	static void usage(FILE *out)
	458	{
	459	fprintf(out, "usage: htparser [-hSf] [-u USER] [-r ROOT] [-p PIDFILE] PORTSPEC... -- ROOT [ARGS...]\n");
	460	fprintf(out, "\twhere PORTSPEC is HANDLER[:PAR[=VAL][(,PAR[=VAL])...]] (try HANDLER:help)\n");
	461	fprintf(out, "\tavailable handlers are `plain' and `ssl'.\n");
	462	}
	463
	464	static void addport(char *spec)
	465	{
	466	char nm, p, p2, n;
	467	struct charvbuf pars, vals;
	468
	469	bufinit(pars);
	470	bufinit(vals);
	471	if((p = strchr(spec, ':')) == NULL) {
	472	nm = spec;
	473	} else {
	474	nm = spec;
	475	*(p++) = 0;
	476	do {
	477	if((n = strchr(p, ',')) != NULL)
	478	*(n++) = 0;
	479	if((p2 = strchr(p, '=')) != NULL)
	480	*(p2++) = 0;
	481	if(!*p) {
	482	usage(stderr);
	483	exit(1);
	484	}
	485	bufadd(pars, p);
	486	if(p2)
	487	bufadd(vals, p2);
	488	else
	489	bufadd(vals, "");
	490	} while((p = n) != NULL);
	491	}
	492
	493	/* XXX: It would be nice to decentralize this, but, meh... */
	494	if(!strcmp(nm, "plain")) {
	495	handleplain(pars.d, pars.b, vals.b);
	496	#ifdef HAVE_GNUTLS
	497	} else if(!strcmp(nm, "ssl")) {
	498	handlegnussl(pars.d, pars.b, vals.b);
	499	#endif
	500	} else {
	501	flog(LOG_ERR, "htparser: unknown port handler `%s'", nm);
	502	exit(1);
	503	}
	504
	505	buffree(pars);
	506	buffree(vals);
	507	}
	508
	509	static void sighandler(int sig)
	510	{
	511	exitioloop(1);
	512	}
	513
	514	int main(int argc, char **argv)
	515	{
	516	int c, d;
	517	int i, s1;
	518	char *root;
	519	FILE *pidout;
	520	struct passwd *pwent;
	521
	522	daemonize = usesyslog = 0;
	523	root = NULL;
	524	pwent = NULL;
	525	while((c = getopt(argc, argv, "+hSfu:r:p:")) >= 0) {
	526	switch(c) {
	527	case 'h':
	528	usage(stdout);
	529	exit(0);
	530	case 'f':
	531	daemonize = 1;
	532	break;
	533	case 'S':
	534	usesyslog = 1;
	535	break;
	536	case 'u':
	537	if((pwent = getpwnam(optarg)) == NULL) {
	538	flog(LOG_ERR, "could not find user %s", optarg);
	539	exit(1);
	540	}
	541	break;
	542	case 'r':
	543	root = optarg;
	544	break;
	545	case 'p':
	546	pidfile = optarg;
	547	break;
	548	default:
	549	usage(stderr);
	550	exit(1);
	551	}
	552	}
	553	s1 = 0;
	554	for(i = optind; i < argc; i++) {
	555	if(!strcmp(argv[i], "--"))
	556	break;
	557	s1 = 1;
	558	addport(argv[i]);
	559	}
	560	if(!s1 \|\| (i == argc)) {
	561	usage(stderr);
	562	exit(1);
	563	}
	564	if((plex = stdmkchild(argv + ++i, initroot, NULL)) < 0) {
	565	flog(LOG_ERR, "could not spawn root multiplexer: %s", strerror(errno));
	566	return(1);
	567	}
	568	bufadd(listeners, mustart(plexwatch, plex));
	569	pidout = NULL;
	570	if(pidfile != NULL) {
	571	if((pidout = fopen(pidfile, "w")) == NULL) {
	572	flog(LOG_ERR, "could not open %s for writing: %s", pidfile, strerror(errno));
	573	return(1);
	574	}
	575	}
	576	if(usesyslog)
	577	opensyslog();
	578	if(root) {
	579	if(chdir(root) \|\| chroot(root)) {
	580	flog(LOG_ERR, "could not chroot to %s: %s", root, strerror(errno));
	581	exit(1);
	582	}
	583	}
	584	if(pwent) {
	585	if(setgid(pwent->pw_gid)) {
	586	flog(LOG_ERR, "could not switch group to %i: %s", (int)pwent->pw_gid, strerror(errno));
	587	exit(1);
	588	}
	589	if(setuid(pwent->pw_uid)) {
	590	flog(LOG_ERR, "could not switch user to %i: %s", (int)pwent->pw_uid, strerror(errno));
	591	exit(1);
	592	}
	593	}
	594	signal(SIGPIPE, SIG_IGN);
	595	signal(SIGCHLD, SIG_IGN);
	596	signal(SIGINT, sighandler);
	597	signal(SIGTERM, sighandler);
	598	if(daemonize) {
	599	daemon(0, 0);
	600	}
	601	if(pidout != NULL) {
	602	fprintf(pidout, "%i\n", getpid());
	603	fclose(pidout);
	604	}
	605	d = 0;
	606	while(!d) {
	607	switch(ioloop()) {
	608	case 0:
	609	d = 1;
	610	break;
	611	case 1:
	612	if(listeners.d > 0) {
	613	while(listeners.d > 0)
	614	resume(listeners.b[0], 0);
	615	flog(LOG_INFO, "no longer listening");
	616	} else {
	617	d = 1;
	618	}
	619	break;
	620	}
	621	}
	622	return(0);
	623	}