[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 <bufio.h>

#include "htparser.h"

static int plex;
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(struct bufio *in)
{
    struct hthead *req;
    struct charbuf method, url, ver;
    int c;
    
    req = NULL;
    bufinit(method);
    bufinit(url);
    bufinit(ver);
    while(1) {
	c = biogetc(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 = biogetc(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 = biogetc(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(parseheadersb(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(struct bufio *in, struct bufio *out, off_t max)
{
    ssize_t read;
    off_t total;
    
    total = 0;
    while(!bioeof(in) && ((max < 0) || (total < max))) {
	if((read = biordata(in)) > 0) {
	    if(max >= 0)
		read = min(max - total, read);
	    if((read = biowritesome(out, in->rbuf.b + in->rh, read)) < 0)
		return(-1);
	    in->rh += read;
	    total += read;
	}
	if(biorspace(in) && ((max < 0) || (biordata(in) < max - total)) && (biofillsome(in) < 0))
	    return(-1);
    }
    return(total);
}

static int recvchunks(struct bufio *in, struct bufio *out)
{
    ssize_t read, chlen;
    int c, r;
    
    while(1) {
	chlen = 0;
	r = 0;
	while(1) {
	    c = biogetc(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) {
	    if((read = biordata(in)) > 0) {
		if((read = biowritesome(out, in->rbuf.b + in->rh, min(read, chlen))) < 0)
		    return(-1);
		in->rh += read;
		chlen -= read;
	    }
	    if(biorspace(in) && (biordata(in) < chlen) && (biofillsome(in) <= 0))
		return(-1);
	}
	if((biogetc(in) != 13) || (biogetc(in) != 10))
	    return(-1);
    }
    /* XXX: Technically, there may be trailers to be read, but that's
     * just about as likely as chunk extensions. */
    if((biogetc(in) != 13) || (biogetc(in) != 10))
	return(-1);
    return(0);
}

static int passchunks(struct bufio *in, struct bufio *out)
{
    size_t read;
    
    while(!bioeof(in)) {
	if((read = biordata(in)) > 0) {
	    bioprintf(out, "%zx\r\n", read);
	    if(biowrite(out, in->rbuf.b + in->rh, read) != read)
		return(-1);
	    in->rh += read;
	    bioprintf(out, "\r\n");
	    if(bioflush(out) < 0)
		return(-1);
	}
	if(biorspace(in) && (biofillsome(in) < 0))
	    return(-1);
    }
    bioprintf(out, "0\r\n\r\n");
    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);
    }
}

static char *connid(void)
{
    static struct charbuf cur;
    int i;
    char *ret;
    
    for(i = 0; i < cur.d; i++) {
	if((++cur.b[i]) > 'Z')
	    cur.b[i] = 'A';
	else
	    goto done;
    }
    bufadd(cur, 'A');
done:
    ret = memcpy(smalloc(cur.d + 1), cur.b, cur.d);
    ret[cur.d] = 0;
    return(ret);
}

static void passduplex(struct bufio *a, int afd, struct bufio *b, int bfd)
{
    struct selected pfd[4], sel;
    struct bufio *sio;
    int n, ev;
    
    while(!bioeof(a) && !bioeof(b)) {
	biocopybuf(b, a);
	biocopybuf(a, b);
	n = 0;
	if(!a->eof) {
	    ev = 0;
	    if(biorspace(a))
		ev |= EV_READ;
	    if(biowdata(a))
		ev |= EV_WRITE;
	    if(ev)
		pfd[n++] = (struct selected){.fd = afd, .ev = ev};
	}
	if(!b->eof) {
	    ev = 0;
	    if(!b->eof && biorspace(b))
		ev |= EV_READ;
	    if(biowdata(b))
		ev |= EV_WRITE;
	    if(ev)
		pfd[n++] = (struct selected){.fd = bfd, .ev = ev};
	}
	if((sel = mblock(600, n, pfd)).ev == 0)
	    break;
	if(sel.fd == afd)
	    sio = a;
	else if(sel.fd == bfd)
	    sio = b;
	else
	    break;
	if((sel.ev & EV_READ) && (biofillsome(sio) < 0))
	    break;
	if((sel.ev & EV_WRITE) && (bioflushsome(sio) < 0))
	    break;
    }
}

void serve(struct bufio *in, int infd, struct conn *conn)
{
    int pfds[2];
    struct bufio *out, *dout;
    struct stdiofd *outi;
    struct hthead *req, *resp;
    char *hd, *id;
    off_t dlen;
    int keep, duplex;
    
    id = connid();
    out = NULL;
    req = resp = NULL;
    while(plex >= 0) {
	bioflush(in);
	if((req = parsereq(in)) == NULL)
	    break;
	if(!canonreq(req))
	    break;
	
	headappheader(req, "X-Ash-Connection-ID", id);
	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 = mtbioopen(pfds[1], 1, 600, "r+", &outi);

	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(bioflush(out))
	    break;
	/* Make sure to send EOF */
	shutdown(pfds[1], SHUT_WR);
	
	if((resp = parseresponseb(out)) == NULL)
	    break;
	replstr(&resp->ver, req->ver);
	
	if(!getheader(resp, "server"))
	    headappheader(resp, "Server", sprintf3("ashd/%s", VERSION));
	duplex = hasheader(resp, "x-ash-switch", "duplex");
	trimx(resp);

	if(duplex) {
	    if(outi->rights < 0)
		break;
	    writerespb(in, resp);
	    bioprintf(in, "\r\n");
	    dout = mtbioopen(outi->rights, 1, 600, "r+", NULL);
	    passduplex(in, infd, dout, outi->rights);
	    outi->rights = -1;
	    bioclose(dout);
	    break;
	} else if(!strcasecmp(req->ver, "HTTP/1.0")) {
	    if(!strcasecmp(req->method, "head")) {
		keep = http10keep(req, resp);
		writerespb(in, resp);
		bioprintf(in, "\r\n");
	    } else if((hd = getheader(resp, "content-length")) != NULL) {
		keep = http10keep(req, resp);
		dlen = atoo(hd);
		writerespb(in, resp);
		bioprintf(in, "\r\n");
		if(passdata(out, in, dlen) != dlen)
		    break;
	    } else {
		headrmheader(resp, "connection");
		writerespb(in, resp);
		bioprintf(in, "\r\n");
		passdata(out, in, -1);
		break;
	    }
	    if(!keep)
		break;
	} else if(!strcasecmp(req->ver, "HTTP/1.1")) {
	    if(!strcasecmp(req->method, "head")) {
		writerespb(in, resp);
		bioprintf(in, "\r\n");
	    } else if((hd = getheader(resp, "content-length")) != NULL) {
		writerespb(in, resp);
		bioprintf(in, "\r\n");
		dlen = atoo(hd);
		if(passdata(out, in, dlen) != dlen)
		    break;
	    } else if(!getheader(resp, "transfer-encoding")) {
		headappheader(resp, "Transfer-Encoding", "chunked");
		writerespb(in, resp);
		bioprintf(in, "\r\n");
		if(passchunks(out, in))
		    break;
	    } else {
		writerespb(in, resp);
		bioprintf(in, "\r\n");
		passdata(out, in, -1);
		break;
	    }
	    if(hasheader(req, "connection", "close") || hasheader(resp, "connection", "close"))
		break;
	} else {
	    break;
	}

	bioclose(out);
	out = NULL;
	freehthead(req);
	freehthead(resp);
	req = resp = NULL;
    }
    
    if(out != NULL)
	bioclose(out);
    if(req != NULL)
	freehthead(req);
    if(resp != NULL)
	freehthead(resp);
    bioclose(in);
    free(id);
}

static void plexwatch(struct muth *muth, va_list args)
{
    vavar(int, fd);
    char *buf;
    int i, s, ret;
    
    s = 0;
    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) {
	    s = 1;
	    free(buf);
	    break;
	}
	/* Maybe I'd like to implement some protocol in this direction
	 * some day... */
	free(buf);
    }
    shutdown(plex, SHUT_RDWR);
    for(i = 0; i < listeners.d; i++) {
	if(listeners.b[i] == muth)
	    bufdel(listeners, i);
    }
    if(s) {
	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, *pidfile, *pidtmp;
    FILE *pidout;
    struct passwd *pwent;
    
    daemonize = usesyslog = 0;
    root = pidfile = 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(optarg[0] && ((pwent = getpwnam(optarg)) == NULL)) {
		flog(LOG_ERR, "could not find user %s", optarg);
		exit(1);
	    }
	    break;
	case 'r':
	    root = optarg[0] ? optarg : NULL;
	    break;
	case 'p':
	    pidfile = optarg[0] ? optarg : NULL;
	    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) {
	pidtmp = sprintf3("%s.new", pidfile);
	if((pidout = fopen(pidtmp, "w")) == NULL) {
	    flog(LOG_ERR, "could not open %s for writing: %s", pidtmp, strerror(errno));
	    return(1);
	}
	if(rename(pidtmp, pidfile)) {
	    flog(LOG_ERR, "could not overwrite %s: %s", pidfile, strerror(errno));
	    unlink(pidtmp);
	    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());
	fflush(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");
		if(pidout != NULL) {
		    putc('\n', pidout);
		    fflush(pidout);
		}
	    } else {
		d = 1;
	    }
	    break;
	}
    }
    if(pidout != NULL)
	ftruncate(fileno(pidout), 0);
    return(0);
}
Commit	Line	Data
f0bbedf7 FT	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>
d341283f	22	#include <fcntl.h>
f4cdf919	23	#include <string.h>
f4cdf919	24	#include <sys/socket.h>
f0cbd8d7	25	#include <pwd.h>
15fa3fe8	26	#include <sys/signal.h>
f4cdf919	27	#include <errno.h>
f0bbedf7 FT	28
	29	#ifdef HAVE_CONFIG_H
	30	#include <config.h>
	31	#endif
	32	#include <utils.h>
f4cdf919	33	#include <mt.h>
83723896	34	#include <mtio.h>
f4cdf919	35	#include <log.h>
66987955	36	#include <req.h>
9d87a119	37	#include <proc.h>
fc253e2f	38	#include <bufio.h>
f4cdf919	39
8774c31b	40	#include "htparser.h"
f4cdf919	41
8774c31b	42	static int plex;
d341283f	43	static int daemonize, usesyslog;
cac13158	44	struct mtbuf listeners;
f4cdf919	45
df431d1d FT	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
fc253e2f	63	static struct hthead parsereq(struct bufio in)
66987955	64	{
5fc1bf9f FT	65	struct hthead *req;
	66	struct charbuf method, url, ver;
	67	int c;
66987955	68
5fc1bf9f FT	69	req = NULL;
	70	bufinit(method);
	71	bufinit(url);
	72	bufinit(ver);
	73	while(1) {
fc253e2f	74	c = biogetc(in);
5fc1bf9f FT	75	if(c == ' ') {
	76	break;
	77	} else if((c == EOF) \|\| (c < 32) \|\| (c >= 128)) {
	78	goto fail;
	79	} else {
	80	bufadd(method, c);
90b0ba0f FT	81	if(method.d >= 128)
90b0ba0f FT	82	goto fail;
66987955	83	}
c9955b14	84	}
c9955b14	85	while(1) {
fc253e2f	86	c = biogetc(in);
5fc1bf9f	87	if(c == ' ') {
c9955b14	88	break;
5fc1bf9f FT	89	} else if((c == EOF) \|\| (c < 32)) {
	90	goto fail;
	91	} else {
	92	bufadd(url, c);
90b0ba0f FT	93	if(url.d >= 65536)
90b0ba0f FT	94	goto fail;
66987955 FT	95	}
66987955 FT	96	}
66987955	97	while(1) {
fc253e2f	98	c = biogetc(in);
5fc1bf9f	99	if(c == 10) {
66987955	100	break;
5fc1bf9f FT	101	} else if(c == 13) {
5fc1bf9f FT	102	} else if((c == EOF) \|\| (c < 32) \|\| (c >= 128)) {
c9955b14	103	goto fail;
5fc1bf9f FT	104	} else {
5fc1bf9f FT	105	bufadd(ver, c);
90b0ba0f FT	106	if(ver.d >= 128)
90b0ba0f FT	107	goto fail;
5fc1bf9f	108	}
66987955	109	}
5fc1bf9f FT	110	bufadd(method, 0);
	111	bufadd(url, 0);
	112	bufadd(ver, 0);
	113	req = mkreq(method.b, url.b, ver.b);
fc253e2f	114	if(parseheadersb(req, in))
5fc1bf9f	115	goto fail;
df431d1d	116	trimx(req);
5fc1bf9f	117	goto out;
c9955b14 FT	118
c9955b14 FT	119	fail:
5fc1bf9f FT	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);
66987955 FT	129	}
66987955 FT	130
fc253e2f	131	static off_t passdata(struct bufio in, struct bufio out, off_t max)
9d87a119	132	{
fc253e2f	133	ssize_t read;
5fc1bf9f	134	off_t total;
5fc1bf9f FT	135
5fc1bf9f FT	136	total = 0;
fc253e2f FT	137	while(!bioeof(in) && ((max < 0) \|\| (total < max))) {
	138	if((read = biordata(in)) > 0) {
	139	if(max >= 0)
	140	read = min(max - total, read);
	141	if((read = biowritesome(out, in->rbuf.b + in->rh, read)) < 0)
	142	return(-1);
	143	in->rh += read;
	144	total += read;
	145	}
	146	if(biorspace(in) && ((max < 0) \|\| (biordata(in) < max - total)) && (biofillsome(in) < 0))
5fc1bf9f	147	return(-1);
9d87a119	148	}
5fc1bf9f FT	149	return(total);
	150	}
	151
fc253e2f	152	static int recvchunks(struct bufio in, struct bufio out)
8d19a9ec	153	{
f728df60	154	ssize_t read, chlen;
8d19a9ec FT	155	int c, r;
	156
	157	while(1) {
	158	chlen = 0;
	159	r = 0;
	160	while(1) {
fc253e2f	161	c = biogetc(in);
8d19a9ec FT	162	if(c == 10) {
	163	if(!r)
	164	return(-1);
	165	break;
	166	} else if(c == 13) {
	167	} else if((c >= '0') && (c <= '9')) {
	168	chlen = (chlen << 4) + (c - '0');
	169	r = 1;
	170	} else if((c >= 'A') && (c <= 'F')) {
	171	chlen = (chlen << 4) + (c + 10 - 'A');
	172	r = 1;
	173	} else if((c >= 'a') && (c <= 'f')) {
	174	chlen = (chlen << 4) + (c + 10 - 'a');
	175	r = 1;
	176	} else {
	177	/* XXX: Technically, there may be chunk extensions to
	178	* be read, but since that will likely never actually
	179	* happen in practice, I can just as well add support
	180	* for that if it actually does become relevant. */
	181	return(-1);
	182	}
	183	}
	184	if(chlen == 0)
	185	break;
	186	while(chlen > 0) {
fc253e2f FT	187	if((read = biordata(in)) > 0) {
	188	if((read = biowritesome(out, in->rbuf.b + in->rh, min(read, chlen))) < 0)
	189	return(-1);
	190	in->rh += read;
	191	chlen -= read;
	192	}
	193	if(biorspace(in) && (biordata(in) < chlen) && (biofillsome(in) <= 0))
8d19a9ec	194	return(-1);
8d19a9ec	195	}
fc253e2f	196	if((biogetc(in) != 13) \|\| (biogetc(in) != 10))
8d19a9ec FT	197	return(-1);
	198	}
	199	/* XXX: Technically, there may be trailers to be read, but that's
	200	* just about as likely as chunk extensions. */
fc253e2f	201	if((biogetc(in) != 13) \|\| (biogetc(in) != 10))
8d19a9ec FT	202	return(-1);
	203	return(0);
	204	}
	205
fc253e2f	206	static int passchunks(struct bufio in, struct bufio out)
5fc1bf9f	207	{
5fc1bf9f FT	208	size_t read;
5fc1bf9f FT	209
fc253e2f FT	210	while(!bioeof(in)) {
	211	if((read = biordata(in)) > 0) {
	212	bioprintf(out, "%zx\r\n", read);
	213	if(biowrite(out, in->rbuf.b + in->rh, read) != read)
	214	return(-1);
	215	in->rh += read;
	216	bioprintf(out, "\r\n");
	217	if(bioflush(out) < 0)
	218	return(-1);
	219	}
	220	if(biorspace(in) && (biofillsome(in) < 0))
5fc1bf9f	221	return(-1);
fc253e2f FT	222	}
fc253e2f FT	223	bioprintf(out, "0\r\n\r\n");
5fc1bf9f FT	224	return(0);
	225	}
	226
	227	static int hasheader(struct hthead head, char name, char *val)
	228	{
	229	char *hd;
	230
	231	if((hd = getheader(head, name)) == NULL)
	232	return(0);
	233	return(!strcasecmp(hd, val));
9d87a119 FT	234	}
9d87a119 FT	235
64a9096a FT	236	static int canonreq(struct hthead *req)
	237	{
	238	char p, p2, *r;
	239	int n;
	240
	241	if(req->url[0] == '/') {
	242	replrest(req, req->url + 1);
	243	if((p = strchr(req->rest, '?')) != NULL)
	244	*p = 0;
	245	return(1);
	246	}
	247	if((p = strstr(req->url, "://")) != NULL) {
	248	n = p - req->url;
	249	if(((n == 4) && !strncasecmp(req->url, "http", 4)) \|\|
	250	((n == 5) && !strncasecmp(req->url, "https", 5))) {
	251	if(getheader(req, "host"))
	252	return(0);
	253	p += 3;
	254	if((p2 = strchr(p, '/')) == NULL) {
	255	headappheader(req, "Host", p);
	256	free(req->url);
	257	req->url = sstrdup("/");
	258	} else {
	259	r = sstrdup(p2);
	260	*(p2++) = 0;
	261	headappheader(req, "Host", p);
	262	free(req->url);
	263	req->url = r;
	264	}
	265	replrest(req, req->url + 1);
	266	if((p = strchr(req->rest, '?')) != NULL)
	267	*p = 0;
	268	return(1);
	269	}
	270	}
	271	return(0);
	272	}
	273
75bb20c8 FT	274	static int http10keep(struct hthead req, struct hthead resp)
	275	{
	276	int fc;
	277
	278	fc = hasheader(resp, "connection", "close");
	279	headrmheader(resp, "connection");
	280	if(!fc && hasheader(req, "connection", "keep-alive")) {
	281	headappheader(resp, "Connection", "Keep-Alive");
	282	return(1);
	283	} else {
	284	return(0);
	285	}
	286	}
	287
43066106 FT	288	static char *connid(void)
	289	{
	290	static struct charbuf cur;
	291	int i;
	292	char *ret;
	293
	294	for(i = 0; i < cur.d; i++) {
	295	if((++cur.b[i]) > 'Z')
	296	cur.b[i] = 'A';
	297	else
	298	goto done;
	299	}
	300	bufadd(cur, 'A');
	301	done:
	302	ret = memcpy(smalloc(cur.d + 1), cur.b, cur.d);
	303	ret[cur.d] = 0;
	304	return(ret);
	305	}
	306
a68db17d FT	307	static void passduplex(struct bufio a, int afd, struct bufio b, int bfd)
	308	{
	309	struct selected pfd[4], sel;
	310	struct bufio *sio;
	311	int n, ev;
	312
	313	while(!bioeof(a) && !bioeof(b)) {
	314	biocopybuf(b, a);
	315	biocopybuf(a, b);
	316	n = 0;
	317	if(!a->eof) {
	318	ev = 0;
	319	if(biorspace(a))
	320	ev \|= EV_READ;
	321	if(biowdata(a))
	322	ev \|= EV_WRITE;
	323	if(ev)
	324	pfd[n++] = (struct selected){.fd = afd, .ev = ev};
	325	}
	326	if(!b->eof) {
	327	ev = 0;
	328	if(!b->eof && biorspace(b))
	329	ev \|= EV_READ;
	330	if(biowdata(b))
	331	ev \|= EV_WRITE;
	332	if(ev)
	333	pfd[n++] = (struct selected){.fd = bfd, .ev = ev};
	334	}
4350acb5 FT	335	if((sel = mblock(600, n, pfd)).ev == 0)
4350acb5 FT	336	break;
a68db17d FT	337	if(sel.fd == afd)
	338	sio = a;
	339	else if(sel.fd == bfd)
	340	sio = b;
	341	else
	342	break;
	343	if((sel.ev & EV_READ) && (biofillsome(sio) < 0))
	344	break;
	345	if((sel.ev & EV_WRITE) && (bioflushsome(sio) < 0))
	346	break;
	347	}
	348	}
	349
	350	void serve(struct bufio in, int infd, struct conn conn)
66987955	351	{
af34331c	352	int pfds[2];
a68db17d FT	353	struct bufio out, dout;
a68db17d FT	354	struct stdiofd *outi;
9d87a119	355	struct hthead req, resp;
43066106	356	char hd, id;
5fc1bf9f	357	off_t dlen;
a68db17d	358	int keep, duplex;
66987955	359
43066106	360	id = connid();
5fc1bf9f	361	out = NULL;
3c296bd4	362	req = resp = NULL;
cac13158	363	while(plex >= 0) {
fc253e2f	364	bioflush(in);
5fc1bf9f FT	365	if((req = parsereq(in)) == NULL)
5fc1bf9f FT	366	break;
64a9096a FT	367	if(!canonreq(req))
64a9096a FT	368	break;
9d87a119	369
43066106	370	headappheader(req, "X-Ash-Connection-ID", id);
8774c31b FT	371	if((conn->initreq != NULL) && conn->initreq(conn, req))
	372	break;
	373
cac13158	374	if((plex < 0) \|\| block(plex, EV_WRITE, 60) <= 0)
5fc1bf9f	375	break;
af34331c	376	if(socketpair(PF_UNIX, SOCK_STREAM, 0, pfds))
5fc1bf9f	377	break;
af34331c	378	if(sendreq(plex, req, pfds[0]))
5fc1bf9f	379	break;
af34331c	380	close(pfds[0]);
a68db17d	381	out = mtbioopen(pfds[1], 1, 600, "r+", &outi);
a0327573	382
8d19a9ec FT	383	if(getheader(req, "content-type") != NULL) {
	384	if((hd = getheader(req, "content-length")) != NULL) {
	385	dlen = atoo(hd);
	386	if(dlen > 0) {
	387	if(passdata(in, out, dlen) != dlen)
	388	break;
	389	}
	390	} else if(((hd = getheader(req, "transfer-encoding")) != NULL) && !strcasecmp(hd, "chunked")) {
	391	if(recvchunks(in, out))
5fc1bf9f	392	break;
8d19a9ec	393	} else {
2dbb9937 FT	394	/* Ignore rather than abort, to be kinder to broken clients. */
2dbb9937 FT	395	headrmheader(req, "content-type");
a06a2fbd	396	}
a0327573	397	}
fc253e2f	398	if(bioflush(out))
5fc1bf9f	399	break;
d93d9a05	400	/* Make sure to send EOF */
5fc1bf9f	401	shutdown(pfds[1], SHUT_WR);
9d87a119	402
fc253e2f	403	if((resp = parseresponseb(out)) == NULL)
f9255ddd	404	break;
5fc1bf9f	405	replstr(&resp->ver, req->ver);
1c3e0167 FT	406
	407	if(!getheader(resp, "server"))
	408	headappheader(resp, "Server", sprintf3("ashd/%s", VERSION));
a68db17d FT	409	duplex = hasheader(resp, "x-ash-switch", "duplex");
a68db17d FT	410	trimx(resp);
5fc1bf9f	411
a68db17d FT	412	if(duplex) {
	413	if(outi->rights < 0)
	414	break;
	415	writerespb(in, resp);
	416	bioprintf(in, "\r\n");
	417	dout = mtbioopen(outi->rights, 1, 600, "r+", NULL);
	418	passduplex(in, infd, dout, outi->rights);
	419	outi->rights = -1;
	420	bioclose(dout);
	421	break;
	422	} else if(!strcasecmp(req->ver, "HTTP/1.0")) {
18fb436d	423	if(!strcasecmp(req->method, "head")) {
75bb20c8	424	keep = http10keep(req, resp);
fc253e2f FT	425	writerespb(in, resp);
fc253e2f FT	426	bioprintf(in, "\r\n");
18fb436d	427	} else if((hd = getheader(resp, "content-length")) != NULL) {
75bb20c8	428	keep = http10keep(req, resp);
5226f7c5	429	dlen = atoo(hd);
fc253e2f FT	430	writerespb(in, resp);
fc253e2f FT	431	bioprintf(in, "\r\n");
5226f7c5	432	if(passdata(out, in, dlen) != dlen)
5fc1bf9f	433	break;
5fc1bf9f	434	} else {
75bb20c8	435	headrmheader(resp, "connection");
fc253e2f FT	436	writerespb(in, resp);
fc253e2f FT	437	bioprintf(in, "\r\n");
5fc1bf9f FT	438	passdata(out, in, -1);
5fc1bf9f FT	439	break;
9d87a119	440	}
75bb20c8	441	if(!keep)
5fc1bf9f	442	break;
cefb0f7a	443	} else if(!strcasecmp(req->ver, "HTTP/1.1")) {
18fb436d	444	if(!strcasecmp(req->method, "head")) {
fc253e2f FT	445	writerespb(in, resp);
fc253e2f FT	446	bioprintf(in, "\r\n");
18fb436d	447	} else if((hd = getheader(resp, "content-length")) != NULL) {
fc253e2f FT	448	writerespb(in, resp);
fc253e2f FT	449	bioprintf(in, "\r\n");
5226f7c5 FT	450	dlen = atoo(hd);
5226f7c5 FT	451	if(passdata(out, in, dlen) != dlen)
5fc1bf9f FT	452	break;
	453	} else if(!getheader(resp, "transfer-encoding")) {
	454	headappheader(resp, "Transfer-Encoding", "chunked");
fc253e2f FT	455	writerespb(in, resp);
fc253e2f FT	456	bioprintf(in, "\r\n");
5fc1bf9f FT	457	if(passchunks(out, in))
	458	break;
	459	} else {
fc253e2f FT	460	writerespb(in, resp);
fc253e2f FT	461	bioprintf(in, "\r\n");
5fc1bf9f	462	passdata(out, in, -1);
9d87a119	463	break;
5fc1bf9f FT	464	}
5fc1bf9f FT	465	if(hasheader(req, "connection", "close") \|\| hasheader(resp, "connection", "close"))
9d87a119	466	break;
5fc1bf9f FT	467	} else {
5fc1bf9f FT	468	break;
9d87a119	469	}
5fc1bf9f	470
fc253e2f	471	bioclose(out);
5fc1bf9f	472	out = NULL;
9d87a119	473	freehthead(req);
9d87a119	474	freehthead(resp);
5fc1bf9f	475	req = resp = NULL;
66987955 FT	476	}
66987955 FT	477
5fc1bf9f	478	if(out != NULL)
fc253e2f	479	bioclose(out);
9d87a119 FT	480	if(req != NULL)
	481	freehthead(req);
	482	if(resp != NULL)
	483	freehthead(resp);
fc253e2f	484	bioclose(in);
43066106	485	free(id);
66987955 FT	486	}
66987955 FT	487
32e24c19 FT	488	static void plexwatch(struct muth *muth, va_list args)
	489	{
	490	vavar(int, fd);
	491	char *buf;
4139016c	492	int i, s, ret;
32e24c19	493
4139016c	494	s = 0;
32e24c19	495	while(1) {
cac13158 FT	496	if(block(fd, EV_READ, 0) == 0)
cac13158 FT	497	break;
32e24c19 FT	498	buf = smalloc(65536);
	499	ret = recv(fd, buf, 65536, 0);
	500	if(ret < 0) {
	501	flog(LOG_WARNING, "received error on rootplex read channel: %s", strerror(errno));
	502	exit(1);
	503	} else if(ret == 0) {
4139016c	504	s = 1;
8e9ec020 FT	505	free(buf);
8e9ec020 FT	506	break;
32e24c19 FT	507	}
	508	/* Maybe I'd like to implement some protocol in this direction
	509	* some day... */
	510	free(buf);
	511	}
ecd4208b	512	shutdown(plex, SHUT_RDWR);
8e9ec020 FT	513	for(i = 0; i < listeners.d; i++) {
	514	if(listeners.b[i] == muth)
	515	bufdel(listeners, i);
	516	}
4139016c FT	517	if(s) {
	518	flog(LOG_INFO, "root handler exited, so shutting down listening...");
	519	while(listeners.d > 0)
	520	resume(listeners.b[0], 0);
	521	}
32e24c19 FT	522	}
32e24c19 FT	523
d341283f FT	524	static void initroot(void *uu)
	525	{
	526	int fd;
	527
cf91aa53	528	setsid();
d341283f	529	if(daemonize) {
d341283f FT	530	chdir("/");
	531	if((fd = open("/dev/null", O_RDWR)) >= 0) {
	532	dup2(fd, 0);
	533	dup2(fd, 1);
	534	dup2(fd, 2);
	535	close(fd);
	536	}
	537	}
	538	if(usesyslog)
	539	putenv("ASHD_USESYSLOG=1");
	540	else
	541	unsetenv("ASHD_USESYSLOG");
	542	}
	543
8774c31b FT	544	static void usage(FILE *out)
8774c31b FT	545	{
43c58ba2	546	fprintf(out, "usage: htparser [-hSf] [-u USER] [-r ROOT] [-p PIDFILE] PORTSPEC... -- ROOT [ARGS...]\n");
8774c31b	547	fprintf(out, "\twhere PORTSPEC is HANDLER[:PAR[=VAL][(,PAR[=VAL])...]] (try HANDLER:help)\n");
6ca53b2e	548	fprintf(out, "\tavailable handlers are `plain' and `ssl'.\n");
8774c31b FT	549	}
	550
	551	static void addport(char *spec)
	552	{
	553	char nm, p, p2, n;
	554	struct charvbuf pars, vals;
	555
	556	bufinit(pars);
	557	bufinit(vals);
	558	if((p = strchr(spec, ':')) == NULL) {
	559	nm = spec;
	560	} else {
	561	nm = spec;
	562	*(p++) = 0;
	563	do {
	564	if((n = strchr(p, ',')) != NULL)
	565	*(n++) = 0;
	566	if((p2 = strchr(p, '=')) != NULL)
	567	*(p2++) = 0;
	568	if(!*p) {
	569	usage(stderr);
	570	exit(1);
	571	}
	572	bufadd(pars, p);
	573	if(p2)
	574	bufadd(vals, p2);
	575	else
	576	bufadd(vals, "");
	577	} while((p = n) != NULL);
	578	}
	579
	580	/* XXX: It would be nice to decentralize this, but, meh... */
	581	if(!strcmp(nm, "plain")) {
	582	handleplain(pars.d, pars.b, vals.b);
6ca53b2e FT	583	#ifdef HAVE_GNUTLS
	584	} else if(!strcmp(nm, "ssl")) {
	585	handlegnussl(pars.d, pars.b, vals.b);
	586	#endif
8774c31b FT	587	} else {
	588	flog(LOG_ERR, "htparser: unknown port handler `%s'", nm);
	589	exit(1);
	590	}
	591
	592	buffree(pars);
	593	buffree(vals);
	594	}
	595
cac13158 FT	596	static void sighandler(int sig)
	597	{
	598	exitioloop(1);
	599	}
	600
f0bbedf7 FT	601	int main(int argc, char **argv)
f0bbedf7 FT	602	{
cac13158	603	int c, d;
8774c31b	604	int i, s1;
5599a52a	605	char root, pidfile, *pidtmp;
43c58ba2	606	FILE *pidout;
f0cbd8d7	607	struct passwd *pwent;
f4cdf919	608
d341283f	609	daemonize = usesyslog = 0;
a1a3489b	610	root = pidfile = NULL;
f0cbd8d7	611	pwent = NULL;
43c58ba2	612	while((c = getopt(argc, argv, "+hSfu:r:p:")) >= 0) {
8774c31b FT	613	switch(c) {
	614	case 'h':
	615	usage(stdout);
	616	exit(0);
f0cbd8d7 FT	617	case 'f':
	618	daemonize = 1;
	619	break;
	620	case 'S':
d341283f	621	usesyslog = 1;
f0cbd8d7 FT	622	break;
f0cbd8d7 FT	623	case 'u':
eb174cf6	624	if(optarg[0] && ((pwent = getpwnam(optarg)) == NULL)) {
f0cbd8d7 FT	625	flog(LOG_ERR, "could not find user %s", optarg);
	626	exit(1);
	627	}
	628	break;
	629	case 'r':
eb174cf6	630	root = optarg[0] ? optarg : NULL;
f0cbd8d7	631	break;
43c58ba2	632	case 'p':
eb174cf6	633	pidfile = optarg[0] ? optarg : NULL;
43c58ba2	634	break;
8774c31b FT	635	default:
	636	usage(stderr);
	637	exit(1);
	638	}
	639	}
8774c31b FT	640	s1 = 0;
	641	for(i = optind; i < argc; i++) {
	642	if(!strcmp(argv[i], "--"))
	643	break;
	644	s1 = 1;
	645	addport(argv[i]);
9d87a119	646	}
8774c31b FT	647	if(!s1 \|\| (i == argc)) {
	648	usage(stderr);
	649	exit(1);
f4cdf919	650	}
d341283f	651	if((plex = stdmkchild(argv + ++i, initroot, NULL)) < 0) {
8774c31b FT	652	flog(LOG_ERR, "could not spawn root multiplexer: %s", strerror(errno));
8774c31b FT	653	return(1);
f4cdf919	654	}
cac13158	655	bufadd(listeners, mustart(plexwatch, plex));
43c58ba2 FT	656	pidout = NULL;
43c58ba2 FT	657	if(pidfile != NULL) {
5599a52a FT	658	pidtmp = sprintf3("%s.new", pidfile);
	659	if((pidout = fopen(pidtmp, "w")) == NULL) {
	660	flog(LOG_ERR, "could not open %s for writing: %s", pidtmp, strerror(errno));
	661	return(1);
	662	}
	663	if(rename(pidtmp, pidfile)) {
	664	flog(LOG_ERR, "could not overwrite %s: %s", pidfile, strerror(errno));
	665	unlink(pidtmp);
43c58ba2 FT	666	return(1);
	667	}
	668	}
d341283f	669	if(usesyslog)
f0cbd8d7 FT	670	opensyslog();
f0cbd8d7 FT	671	if(root) {
0370bd82	672	if(chdir(root) \|\| chroot(root)) {
f0cbd8d7 FT	673	flog(LOG_ERR, "could not chroot to %s: %s", root, strerror(errno));
	674	exit(1);
	675	}
	676	}
	677	if(pwent) {
	678	if(setgid(pwent->pw_gid)) {
	679	flog(LOG_ERR, "could not switch group to %i: %s", (int)pwent->pw_gid, strerror(errno));
	680	exit(1);
	681	}
	682	if(setuid(pwent->pw_uid)) {
	683	flog(LOG_ERR, "could not switch user to %i: %s", (int)pwent->pw_uid, strerror(errno));
	684	exit(1);
	685	}
	686	}
15fa3fe8	687	signal(SIGPIPE, SIG_IGN);
cac13158 FT	688	signal(SIGCHLD, SIG_IGN);
	689	signal(SIGINT, sighandler);
	690	signal(SIGTERM, sighandler);
f0cbd8d7 FT	691	if(daemonize) {
	692	daemon(0, 0);
	693	}
ee036f74	694	if(pidout != NULL) {
43c58ba2	695	fprintf(pidout, "%i\n", getpid());
5599a52a	696	fflush(pidout);
ee036f74	697	}
cac13158 FT	698	d = 0;
	699	while(!d) {
	700	switch(ioloop()) {
	701	case 0:
	702	d = 1;
	703	break;
	704	case 1:
	705	if(listeners.d > 0) {
8e9ec020 FT	706	while(listeners.d > 0)
8e9ec020 FT	707	resume(listeners.b[0], 0);
cac13158	708	flog(LOG_INFO, "no longer listening");
5599a52a FT	709	if(pidout != NULL) {
	710	putc('\n', pidout);
	711	fflush(pidout);
	712	}
cac13158 FT	713	} else {
	714	d = 1;
	715	}
	716	break;
	717	}
	718	}
5599a52a FT	719	if(pidout != NULL)
5599a52a FT	720	ftruncate(fileno(pidout), 0);
f4cdf919	721	return(0);
f0bbedf7	722	}