[ashd.git] / src / callcgi.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 <string.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h>
#include <signal.h>
#include <sys/poll.h>

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

static char **environ;

static int passdata(FILE *in, FILE *out)
{
    int ret;
    char buf[65536];
    struct pollfd pfds[2];
    
    while(!feof(in)) {
	memset(pfds, 0, sizeof(struct pollfd) * 2);
	pfds[0].fd = fileno(in);
	pfds[0].events = POLLIN;
	pfds[1].fd = fileno(out);
	pfds[1].events = POLLHUP;
	ret = poll(pfds, 2, -1);
	if(ret < 0) {
	    if(errno != EINTR) {
		flog(LOG_ERR, "callcgi: error in poll: %s", strerror(errno));
		return(1);
	    }
	}
	if(ret > 0) {
	    if(pfds[0].revents & (POLLIN | POLLERR | POLLHUP)) {
		ret = fread(buf, 1, 65536, in);
		if(ferror(in)) {
		    flog(LOG_ERR, "callcgi: could not read input: %s", strerror(errno));
		    return(1);
		}
		if(fwrite(buf, 1, ret, out) != ret) {
		    flog(LOG_ERR, "callcgi: could not write output: %s", strerror(errno));
		    return(1);
		}
	    }
	    if(pfds[1].revents & POLLHUP)
		return(1);
	}
    }
    return(0);
}

static char *absolutify(char *file)
{
    char cwd[1024];
    
    if(*file != '/') {
	getcwd(cwd, sizeof(cwd));
	return(sprintf2("%s/%s", cwd, file));
    }
    return(sstrdup(file));
}

static pid_t forkchild(int inpath, char *prog, char *file, char *method, char *url, char *rest, int *infd, int *outfd)
{
    int i;
    char *qp, **env, *name;
    int inp[2], outp[2];
    pid_t pid;
    char *unqr;

    pipe(inp);
    pipe(outp);
    if((pid = fork()) < 0) {
	flog(LOG_ERR, "callcgi: could not fork");
	exit(1);
    }
    if(pid == 0) {
	close(inp[1]);
	close(outp[0]);
	dup2(inp[0], 0);
	dup2(outp[1], 1);
	for(i = 3; i < FD_SETSIZE; i++)
	    close(i);
	if((qp = strchr(url, '?')) != NULL)
	    *(qp++) = 0;
	putenv(sprintf2("SERVER_SOFTWARE=ashd/%s", VERSION));
	putenv("GATEWAY_INTERFACE=CGI/1.1");
	if(getenv("HTTP_VERSION"))
	    putenv(sprintf2("SERVER_PROTOCOL=%s", getenv("HTTP_VERSION")));
	putenv(sprintf2("REQUEST_METHOD=%s", method));
	unqr = unquoteurl(rest);
	putenv(sprintf2("PATH_INFO=%s", unqr?unqr:rest));
	name = url;
	/* XXX: This is an ugly hack (I think), but though I can think
	 * of several alternatives, none seem to be better. */
	if(*rest && (strlen(url) >= strlen(rest)) &&
	   !strcmp(rest, url + strlen(url) - strlen(rest))) {
	    name = sprintf2("%.*s", (int)(strlen(url) - strlen(rest)), url);
	}
	putenv(sprintf2("SCRIPT_NAME=%s", name));
	putenv(sprintf2("QUERY_STRING=%s", qp?qp:""));
	if(getenv("REQ_HOST"))
	    putenv(sprintf2("SERVER_NAME=%s", getenv("REQ_HOST")));
	if(getenv("REQ_X_ASH_SERVER_PORT"))
	    putenv(sprintf2("SERVER_PORT=%s", getenv("REQ_X_ASH_SERVER_PORT")));
	if(getenv("REQ_X_ASH_PROTOCOL") && !strcmp(getenv("REQ_X_ASH_PROTOCOL"), "https"))
	    putenv("HTTPS=on");
	if(getenv("REQ_X_ASH_ADDRESS"))
	    putenv(sprintf2("REMOTE_ADDR=%s", getenv("REQ_X_ASH_ADDRESS")));
	if(getenv("REQ_X_ASH_REMOTE_USER"))
	    putenv(sprintf2("REMOTE_USER=%s", getenv("REQ_X_ASH_REMOTE_USER")));
	if(getenv("REQ_CONTENT_TYPE"))
	    putenv(sprintf2("CONTENT_TYPE=%s", getenv("REQ_CONTENT_TYPE")));
	if(getenv("REQ_CONTENT_LENGTH"))
	    putenv(sprintf2("CONTENT_LENGTH=%s", getenv("REQ_CONTENT_LENGTH")));
	for(env = environ; *env; env++) {
	    if(!strncmp(*env, "REQ_", 4))
		putenv(sprintf2("HTTP_%s", (*env) + 4));
	}
	/*
	 * This is (understandably) missing from the CGI
	 * specification, but PHP seems to require it.
	 */
	putenv(sprintf2("SCRIPT_FILENAME=%s", absolutify(file)));
	if(inpath)
	    execlp(prog, prog, file, NULL);
	else
	    execl(prog, prog, file, NULL);
	exit(127);
    }
    close(inp[0]);
    close(outp[1]);
    *infd = inp[1];
    *outfd = outp[0];
    return(pid);
}

static void trim(struct charbuf *buf)
{
    char *p;
    
    for(p = buf->b; (p - buf->b < buf->d) && isspace(*p); p++);
    memmove(buf->b, p, buf->d -= (p - buf->b));
    for(p = buf->b + buf->d - 1; (p > buf->b) && isspace(*p); p--, buf->d--);
}

static char **parsecgiheaders(FILE *s)
{
    int c, state;
    struct charvbuf hbuf;
    struct charbuf buf;
    
    bufinit(hbuf);
    bufinit(buf);
    state = 0;
    while(1) {
	c = fgetc(s);
    again:
	if(state == 0) {
	    if(c == '\r') {
	    } else if(c == '\n') {
		break;
	    } else if(c == EOF) {
		goto fail;
	    } else {
		state = 1;
		goto again;
	    }
	} else if(state == 1) {
	    if(c == ':') {
		trim(&buf);
		bufadd(buf, 0);
		bufadd(hbuf, buf.b);
		bufinit(buf);
		state = 2;
	    } else if(c == '\r') {
	    } else if(c == '\n') {
		goto fail;
	    } else if(c == EOF) {
		goto fail;
	    } else {
		bufadd(buf, c);
	    }
	} else if(state == 2) {
	    if(c == '\r') {
	    } else if(c == '\n') {
		trim(&buf);
		bufadd(buf, 0);
		bufadd(hbuf, buf.b);
		bufinit(buf);
		state = 0;
	    } else if(c == EOF) {
		goto fail;
	    } else {
		bufadd(buf, c);
	    }
	}
    }
    bufadd(hbuf, NULL);
    return(hbuf.b);
    
fail:
    buffree(hbuf);
    buffree(buf);
    return(NULL);
}

static char *defstatus(int code)
{
    if(code == 200)
	return("OK");
    else if(code == 201)
	return("Created");
    else if(code == 202)
	return("Accepted");
    else if(code == 204)
	return("No Content");
    else if(code == 300)
	return("Multiple Choices");
    else if(code == 301)
	return("Moved Permanently");
    else if(code == 302)
	return("Found");
    else if(code == 303)
	return("See Other");
    else if(code == 304)
	return("Not Modified");
    else if(code == 307)
	return("Moved Temporarily");
    else if(code == 400)
	return("Bad Request");
    else if(code == 401)
	return("Unauthorized");
    else if(code == 403)
	return("Forbidden");
    else if(code == 404)
	return("Not Found");
    else if(code == 500)
	return("Internal Server Error");
    else if(code == 501)
	return("Not Implemented");
    else if(code == 503)
	return("Service Unavailable");
    else
	return("Unknown status");
}

static void sendstatus(char **headers, FILE *out)
{
    char **hp;
    char *status, *location;
    
    hp = headers;
    status = location = NULL;
    while(*hp) {
	if(!strcasecmp(hp[0], "status")) {
	    status = hp[1];
	    /* Clear this header, so that it is not transmitted by sendheaders. */
	    **hp = 0;
	} else if(!strcasecmp(hp[0], "location")) {
	    location = hp[1];
	    hp += 2;
	} else {
	    hp += 2;
	}
    }
    if(status) {
	if(strchr(status, ' '))
	    fprintf(out, "HTTP/1.1 %s\n", status);
	else
	    fprintf(out, "HTTP/1.1 %i %s\n", atoi(status), defstatus(atoi(status)));
    } else if(location) {
	fprintf(out, "HTTP/1.1 303 See Other\n");
    } else {
	fprintf(out, "HTTP/1.1 200 OK\n");
    }
}

static void sendheaders(char **headers, FILE *out)
{
    while(*headers) {
	if(**headers)
	    fprintf(out, "%s: %s\n", headers[0], headers[1]);
	headers += 2;
    }
}

static void usage(void)
{
    flog(LOG_ERR, "usage: callcgi [-c] [-p PROGRAM] METHOD URL REST");
}

int main(int argc, char **argv, char **envp)
{
    int c;
    char *file, *prog, *sp;
    int inpath, cd;
    int infd, outfd;
    FILE *in, *out;
    char **headers;
    pid_t child;
    
    environ = envp;
    signal(SIGPIPE, SIG_IGN);
    
    prog = NULL;
    inpath = 0;
    cd = 0;
    while((c = getopt(argc, argv, "cp:")) >= 0) {
	switch(c) {
	case 'c':
	    cd = 1;
	    break;
	case 'p':
	    prog = optarg;
	    inpath = 1;
	    break;
	default:
	    usage();
	    exit(1);
	}
    }
    
    if(argc - optind < 3) {
	usage();
	exit(1);
    }
    if((file = getenv("REQ_X_ASH_FILE")) == NULL) {
	flog(LOG_ERR, "callcgi: needs to be called with the X-Ash-File header");
	exit(1);
    }
    
    if(cd) {
	/* This behavior is encouraged by the CGI specification (RFC 3875, 7.2),
	 * but not strictly required, and I get the feeling it might break some
	 * relative paths here or there, so it's not the default for now. */
	if((sp = strrchr(file, '/')) != NULL) {
	    *sp = 0;
	    if(chdir(file)) {
		*sp = '/';
	    } else {
		file = sp + 1;
	    }
	}
    }
    
    if(prog == NULL)
	prog = file;
    child = forkchild(inpath, prog, file, argv[optind], argv[optind + 1], argv[optind + 2], &infd, &outfd);
    in = fdopen(infd, "w");
    passdata(stdin, in);	/* Ignore errors, perhaps? */
    fclose(in);
    out = fdopen(outfd, "r");
    if((headers = parsecgiheaders(out)) == NULL) {
	flog(LOG_WARNING, "CGI handler returned invalid headers");
	exit(1);
    }
    sendstatus(headers, stdout);
    sendheaders(headers, stdout);
    printf("\n");
    if(passdata(out, stdout))
	kill(child, SIGINT);
    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 <string.h>
	21	#include <stdio.h>
	22	#include <unistd.h>
	23	#include <errno.h>
	24	#include <ctype.h>
	25	#include <signal.h>
	26	#include <sys/poll.h>
	27
	28	#ifdef HAVE_CONFIG_H
	29	#include <config.h>
	30	#endif
	31	#include <utils.h>
	32	#include <log.h>
	33	#include <req.h>
	34
	35	static char **environ;
	36
	37	static int passdata(FILE in, FILE out)
	38	{
	39	int ret;
	40	char buf[65536];
	41	struct pollfd pfds[2];
	42
	43	while(!feof(in)) {
	44	memset(pfds, 0, sizeof(struct pollfd) * 2);
	45	pfds[0].fd = fileno(in);
	46	pfds[0].events = POLLIN;
	47	pfds[1].fd = fileno(out);
	48	pfds[1].events = POLLHUP;
	49	ret = poll(pfds, 2, -1);
	50	if(ret < 0) {
	51	if(errno != EINTR) {
	52	flog(LOG_ERR, "callcgi: error in poll: %s", strerror(errno));
	53	return(1);
	54	}
	55	}
	56	if(ret > 0) {
	57	if(pfds[0].revents & (POLLIN \| POLLERR \| POLLHUP)) {
	58	ret = fread(buf, 1, 65536, in);
	59	if(ferror(in)) {
	60	flog(LOG_ERR, "callcgi: could not read input: %s", strerror(errno));
	61	return(1);
	62	}
	63	if(fwrite(buf, 1, ret, out) != ret) {
	64	flog(LOG_ERR, "callcgi: could not write output: %s", strerror(errno));
	65	return(1);
	66	}
	67	}
	68	if(pfds[1].revents & POLLHUP)
	69	return(1);
	70	}
	71	}
	72	return(0);
	73	}
	74
	75	static char absolutify(char file)
	76	{
	77	char cwd[1024];
	78
	79	if(*file != '/') {
	80	getcwd(cwd, sizeof(cwd));
	81	return(sprintf2("%s/%s", cwd, file));
	82	}
	83	return(sstrdup(file));
	84	}
	85
	86	static pid_t forkchild(int inpath, char prog, char file, char method, char url, char rest, int infd, int *outfd)
	87	{
	88	int i;
	89	char qp, env, name;
	90	int inp[2], outp[2];
	91	pid_t pid;
	92	char *unqr;
	93
	94	pipe(inp);
	95	pipe(outp);
	96	if((pid = fork()) < 0) {
	97	flog(LOG_ERR, "callcgi: could not fork");
	98	exit(1);
	99	}
	100	if(pid == 0) {
	101	close(inp[1]);
	102	close(outp[0]);
	103	dup2(inp[0], 0);
	104	dup2(outp[1], 1);
	105	for(i = 3; i < FD_SETSIZE; i++)
	106	close(i);
	107	if((qp = strchr(url, '?')) != NULL)
	108	*(qp++) = 0;
	109	putenv(sprintf2("SERVER_SOFTWARE=ashd/%s", VERSION));
	110	putenv("GATEWAY_INTERFACE=CGI/1.1");
	111	if(getenv("HTTP_VERSION"))
	112	putenv(sprintf2("SERVER_PROTOCOL=%s", getenv("HTTP_VERSION")));
	113	putenv(sprintf2("REQUEST_METHOD=%s", method));
	114	unqr = unquoteurl(rest);
	115	putenv(sprintf2("PATH_INFO=%s", unqr?unqr:rest));
	116	name = url;
	117	/* XXX: This is an ugly hack (I think), but though I can think
	118	* of several alternatives, none seem to be better. */
	119	if(*rest && (strlen(url) >= strlen(rest)) &&
	120	!strcmp(rest, url + strlen(url) - strlen(rest))) {
	121	name = sprintf2("%.*s", (int)(strlen(url) - strlen(rest)), url);
	122	}
	123	putenv(sprintf2("SCRIPT_NAME=%s", name));
	124	putenv(sprintf2("QUERY_STRING=%s", qp?qp:""));
	125	if(getenv("REQ_HOST"))
	126	putenv(sprintf2("SERVER_NAME=%s", getenv("REQ_HOST")));
	127	if(getenv("REQ_X_ASH_SERVER_PORT"))
	128	putenv(sprintf2("SERVER_PORT=%s", getenv("REQ_X_ASH_SERVER_PORT")));
	129	if(getenv("REQ_X_ASH_PROTOCOL") && !strcmp(getenv("REQ_X_ASH_PROTOCOL"), "https"))
	130	putenv("HTTPS=on");
	131	if(getenv("REQ_X_ASH_ADDRESS"))
	132	putenv(sprintf2("REMOTE_ADDR=%s", getenv("REQ_X_ASH_ADDRESS")));
	133	if(getenv("REQ_X_ASH_REMOTE_USER"))
	134	putenv(sprintf2("REMOTE_USER=%s", getenv("REQ_X_ASH_REMOTE_USER")));
	135	if(getenv("REQ_CONTENT_TYPE"))
	136	putenv(sprintf2("CONTENT_TYPE=%s", getenv("REQ_CONTENT_TYPE")));
	137	if(getenv("REQ_CONTENT_LENGTH"))
	138	putenv(sprintf2("CONTENT_LENGTH=%s", getenv("REQ_CONTENT_LENGTH")));
	139	for(env = environ; *env; env++) {
	140	if(!strncmp(*env, "REQ_", 4))
	141	putenv(sprintf2("HTTP_%s", (*env) + 4));
	142	}
	143	/*
	144	* This is (understandably) missing from the CGI
	145	* specification, but PHP seems to require it.
	146	*/
	147	putenv(sprintf2("SCRIPT_FILENAME=%s", absolutify(file)));
	148	if(inpath)
	149	execlp(prog, prog, file, NULL);
	150	else
	151	execl(prog, prog, file, NULL);
	152	exit(127);
	153	}
	154	close(inp[0]);
	155	close(outp[1]);
	156	*infd = inp[1];
	157	*outfd = outp[0];
	158	return(pid);
	159	}
	160
	161	static void trim(struct charbuf *buf)
	162	{
	163	char *p;
	164
	165	for(p = buf->b; (p - buf->b < buf->d) && isspace(*p); p++);
	166	memmove(buf->b, p, buf->d -= (p - buf->b));
	167	for(p = buf->b + buf->d - 1; (p > buf->b) && isspace(*p); p--, buf->d--);
	168	}
	169
	170	static char *parsecgiheaders(FILE s)
	171	{
	172	int c, state;
	173	struct charvbuf hbuf;
	174	struct charbuf buf;
	175
	176	bufinit(hbuf);
	177	bufinit(buf);
	178	state = 0;
	179	while(1) {
	180	c = fgetc(s);
	181	again:
	182	if(state == 0) {
	183	if(c == '\r') {
	184	} else if(c == '\n') {
	185	break;
	186	} else if(c == EOF) {
	187	goto fail;
	188	} else {
	189	state = 1;
	190	goto again;
	191	}
	192	} else if(state == 1) {
	193	if(c == ':') {
	194	trim(&buf);
	195	bufadd(buf, 0);
	196	bufadd(hbuf, buf.b);
	197	bufinit(buf);
	198	state = 2;
	199	} else if(c == '\r') {
	200	} else if(c == '\n') {
	201	goto fail;
	202	} else if(c == EOF) {
	203	goto fail;
	204	} else {
	205	bufadd(buf, c);
	206	}
	207	} else if(state == 2) {
	208	if(c == '\r') {
	209	} else if(c == '\n') {
	210	trim(&buf);
	211	bufadd(buf, 0);
	212	bufadd(hbuf, buf.b);
	213	bufinit(buf);
	214	state = 0;
	215	} else if(c == EOF) {
	216	goto fail;
	217	} else {
	218	bufadd(buf, c);
	219	}
	220	}
	221	}
	222	bufadd(hbuf, NULL);
	223	return(hbuf.b);
	224
	225	fail:
	226	buffree(hbuf);
	227	buffree(buf);
	228	return(NULL);
	229	}
	230
	231	static char *defstatus(int code)
	232	{
	233	if(code == 200)
	234	return("OK");
	235	else if(code == 201)
	236	return("Created");
	237	else if(code == 202)
	238	return("Accepted");
	239	else if(code == 204)
	240	return("No Content");
	241	else if(code == 300)
	242	return("Multiple Choices");
	243	else if(code == 301)
	244	return("Moved Permanently");
	245	else if(code == 302)
	246	return("Found");
	247	else if(code == 303)
	248	return("See Other");
	249	else if(code == 304)
	250	return("Not Modified");
	251	else if(code == 307)
	252	return("Moved Temporarily");
	253	else if(code == 400)
	254	return("Bad Request");
	255	else if(code == 401)
	256	return("Unauthorized");
	257	else if(code == 403)
	258	return("Forbidden");
	259	else if(code == 404)
	260	return("Not Found");
	261	else if(code == 500)
	262	return("Internal Server Error");
	263	else if(code == 501)
	264	return("Not Implemented");
	265	else if(code == 503)
	266	return("Service Unavailable");
	267	else
	268	return("Unknown status");
	269	}
	270
	271	static void sendstatus(char *headers, FILE out)
	272	{
	273	char **hp;
	274	char status, location;
	275
	276	hp = headers;
	277	status = location = NULL;
	278	while(*hp) {
	279	if(!strcasecmp(hp[0], "status")) {
	280	status = hp[1];
	281	/* Clear this header, so that it is not transmitted by sendheaders. */
	282	**hp = 0;
	283	} else if(!strcasecmp(hp[0], "location")) {
	284	location = hp[1];
	285	hp += 2;
	286	} else {
	287	hp += 2;
	288	}
	289	}
	290	if(status) {
	291	if(strchr(status, ' '))
	292	fprintf(out, "HTTP/1.1 %s\n", status);
	293	else
	294	fprintf(out, "HTTP/1.1 %i %s\n", atoi(status), defstatus(atoi(status)));
	295	} else if(location) {
	296	fprintf(out, "HTTP/1.1 303 See Other\n");
	297	} else {
	298	fprintf(out, "HTTP/1.1 200 OK\n");
	299	}
	300	}
	301
	302	static void sendheaders(char *headers, FILE out)
	303	{
	304	while(*headers) {
	305	if(**headers)
	306	fprintf(out, "%s: %s\n", headers[0], headers[1]);
	307	headers += 2;
	308	}
	309	}
	310
	311	static void usage(void)
	312	{
	313	flog(LOG_ERR, "usage: callcgi [-c] [-p PROGRAM] METHOD URL REST");
	314	}
	315
	316	int main(int argc, char argv, char envp)
	317	{
	318	int c;
	319	char file, prog, *sp;
	320	int inpath, cd;
	321	int infd, outfd;
	322	FILE in, out;
	323	char **headers;
	324	pid_t child;
	325
	326	environ = envp;
	327	signal(SIGPIPE, SIG_IGN);
	328
	329	prog = NULL;
	330	inpath = 0;
	331	cd = 0;
	332	while((c = getopt(argc, argv, "cp:")) >= 0) {
	333	switch(c) {
	334	case 'c':
	335	cd = 1;
	336	break;
	337	case 'p':
	338	prog = optarg;
	339	inpath = 1;
	340	break;
	341	default:
	342	usage();
	343	exit(1);
	344	}
	345	}
	346
	347	if(argc - optind < 3) {
	348	usage();
	349	exit(1);
	350	}
	351	if((file = getenv("REQ_X_ASH_FILE")) == NULL) {
	352	flog(LOG_ERR, "callcgi: needs to be called with the X-Ash-File header");
	353	exit(1);
	354	}
	355
	356	if(cd) {
	357	/* This behavior is encouraged by the CGI specification (RFC 3875, 7.2),
	358	* but not strictly required, and I get the feeling it might break some
	359	* relative paths here or there, so it's not the default for now. */
	360	if((sp = strrchr(file, '/')) != NULL) {
	361	*sp = 0;
	362	if(chdir(file)) {
	363	*sp = '/';
	364	} else {
	365	file = sp + 1;
	366	}
	367	}
	368	}
	369
	370	if(prog == NULL)
	371	prog = file;
	372	child = forkchild(inpath, prog, file, argv[optind], argv[optind + 1], argv[optind + 2], &infd, &outfd);
	373	in = fdopen(infd, "w");
	374	passdata(stdin, in); /* Ignore errors, perhaps? */
	375	fclose(in);
	376	out = fdopen(outfd, "r");
	377	if((headers = parsecgiheaders(out)) == NULL) {
	378	flog(LOG_WARNING, "CGI handler returned invalid headers");
	379	exit(1);
	380	}
	381	sendstatus(headers, stdout);
	382	sendheaders(headers, stdout);
	383	printf("\n");
	384	if(passdata(out, stdout))
	385	kill(child, SIGINT);
	386	return(0);
	387	}