[ashd.git] / lib / cf.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 <stdio.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <glob.h>
#include <libgen.h>
#include <sys/socket.h>
#include <errno.h>

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

#define CH_SOCKET 0
#define CH_FORK 1

struct stdchild {
    int type;
    char **argv;
    char **envp;
    int fd;
};

static int parsefile(struct cfstate *s, FILE *in);
static void stdmerge(struct child *old, struct child *new);
static int stdhandle(struct child *ch, struct hthead *req, int fd, void (*chinit)(void *), void *idata);
static void stddestroy(struct child *ch);

static int doinclude(struct cfstate *s, char *spec)
{
    int rv, i;
    FILE *inc;
    glob_t globm;
    char *fbk, *dir, *fspec;

    rv = 0;
    fbk = s->file;
    if(spec[0] == '/') {
	fspec = spec;
    } else {
	dir = sstrdup(fbk);
	fspec = sprintf3("%s/%s", dirname(dir), spec);
	free(dir);
    }
    if(glob(fspec, 0, NULL, &globm))
	return(0);
    for(i = 0; i < globm.gl_pathc; i++) {
	if((inc = fopen(globm.gl_pathv[i], "r")) != NULL) {
	    s->file = globm.gl_pathv[i];
	    if(parsefile(s, inc)) {
		fclose(inc);
		rv = 1;
		goto out;
	    }
	    fclose(inc);
	    inc = NULL;
	}
    }
    
out:
    globfree(&globm);
    s->file = fbk;
    return(rv);
}

static int parsefile(struct cfstate *s, FILE *in)
{
    int i;
    char line[1024];
    int eof, argc;
    int ind, indst[80], indl;
    char *p, **w;
    
    s->lno = 0;
    indst[indl = 0] = 0;
    eof = 0;
    while(1) {
	if(fgets(line, sizeof(line), in) == NULL) {
	    eof = 1;
	    line[0] = 0;
	}
	s->lno++;
	if(line[0]) {
	    for(p = line + strlen(line) - 1; p >= line; p--) {
		if(isspace(*p))
		    *p = 0;
		else
		    break;
	    }
	}
	for(ind = 0, p = line; *p; p++) {
	    if(*p == ' ') {
		ind++;
	    } else if(*p == '\t') {
		ind = ind - (ind % 8) + 8;
	    } else {
		break;
	    }
	}
	if(!eof && (!*p || (*p == '#')))
	    continue;
	
    reindent:
	if(ind > indst[indl]) {
	    indst[++indl] = ind;
	    if(!s->expstart) {
		s->res = tokenize("start");
		if(yield())
		    return(1);
	    } else {
		s->expstart = 0;
	    }
	} else {
	    if(s->expstart) {
		s->res = tokenize("end");
		if(yield())
		    return(1);
		s->expstart = 0;
	    }
	    while(ind < indst[indl]) {
		indl--;
		s->res = tokenize("end");
		if(yield())
		    return(1);
	    }
	    if(ind > indst[indl]) {
		flog(LOG_WARNING, "%s:%i: unexpected indentation level", s->file, s->lno);
		goto reindent;
	    }
	}
	
	if(eof)
	    return(0);
	
	argc = calen(w = tokenize(line));
	if(argc < 1) {
	    /* Shouldn't happen, but... */
	    freeca(w);
	    continue;
	}
	
	if(indl == 0) {
	    if(!strcmp(w[0], "include")) {
		for(i = 1; i < argc; i++) {
		    if(doinclude(s, w[i])) {
			freeca(w);
			return(1);
		    }
		}
		freeca(w);
		continue;
	    }
	}
	
	if(!strcmp(w[0], "start") ||
	   !strcmp(w[0], "end") || 
	   !strcmp(w[0], "eof")) {
	    flog(LOG_WARNING, "%s:%i: illegal directive: %s", s->file, s->lno, w[0]);
	} else {
	    s->res = w;
	    if(yield())
		return(1);
	}
    }
}

static void parsefn(struct muth *mt, va_list args)
{
    vavar(struct cfstate *, s);
    vavar(FILE *, in);
    vavar(char *, file);
    
    s->file = sstrdup(file);
    if(parsefile(s, in))
	goto out;
    do {
	s->res = tokenize("eof");
    } while(!yield());
    
out:
    free(s->file);
}

char **getcfline(struct cfstate *s)
{
    freeca(s->argv);
    if(s->res == NULL)
	resume(s->pf, 0);
    s->argc = calen(s->argv = s->res);
    s->res = NULL;
    return(s->argv);
}

struct cfstate *mkcfparser(FILE *in, char *name)
{
    struct cfstate *s;
    
    omalloc(s);
    s->pf = mustart(parsefn, s, in, name);
    return(s);
}

void freecfparser(struct cfstate *s)
{
    resume(s->pf, -1);
    freeca(s->argv);
    freeca(s->res);
    free(s);
}

char *findstdconf(char *name)
{
    char *home, *path, *p, *p2, *t;
    
    if((home = getenv("HOME")) != NULL) {
	if(!access(t = sprintf2("%s/.ashd/etc/%s", home, name), R_OK))
	    return(t);
	free(t);
    }
    if((path = getenv("PATH")) != NULL) {
	path = sstrdup(path);
	for(p = strtok(path, ":"); p != NULL; p = strtok(NULL, ":")) {
	    if((p2 = strrchr(p, '/')) == NULL)
		continue;
	    *p2 = 0;
	    if(!access(t = sprintf2("%s/etc/%s", p, name), R_OK)) {
		free(path);
		return(t);
	    }
	    free(t);
	}
	free(path);
    }
    return(NULL);
}

struct child *newchild(char *name, struct chandler *iface, void *pdata)
{
    struct child *ch;
    
    omalloc(ch);
    ch->name = sstrdup(name);
    ch->iface = iface;
    ch->pdata = pdata;
    return(ch);
}

void freechild(struct child *ch)
{
    if(ch->iface->destroy != NULL)
	ch->iface->destroy(ch);
    if(ch->name != NULL)
	free(ch->name);
    free(ch);
}

void mergechildren(struct child *dst, struct child *src)
{
    struct child *ch1, *ch2;
    
    for(ch1 = dst; ch1 != NULL; ch1 = ch1->next) {
	for(ch2 = src; ch2 != NULL; ch2 = ch2->next) {
	    if(ch1->iface->merge && !strcmp(ch1->name, ch2->name)) {
		ch1->iface->merge(ch1, ch2);
		break;
	    }
	}
    }
}

void skipcfblock(struct cfstate *s)
{
    char **w;
    
    while(1) {
	w = getcfline(s);
	if(!strcmp(w[0], "end") || !strcmp(w[0], "eof"))
	    return;
    }
}

static struct chandler stdhandler = {
    .handle = stdhandle,
    .merge = stdmerge,
    .destroy = stddestroy,
};

static char **expandargs(struct stdchild *sd)
{
    int i;
    char **ret, *p, *p2, *p3, *np, *env;
    struct charbuf exp;
    
    ret = szmalloc(sizeof(*ret) * (calen(sd->argv) + 1));
    bufinit(exp);
    for(i = 0; sd->argv[i] != NULL; i++) {
	if((p = strchr(sd->argv[i], '$')) == NULL) {
	    ret[i] = sstrdup(sd->argv[i]);
	} else {
	    exp.d = 0;
	    for(p2 = sd->argv[i]; p != NULL; p2 = np, p = strchr(np, '$')) {
		bufcat(exp, p2, p - p2);
		if(p[1] == '{') {
		    if((p3 = strchr((p += 2), '}')) == NULL)
			break;
		    np = p3 + 1;
		} else {
		    for(p3 = ++p; *p3; p3++) {
			if(!(((*p3 >= 'a') && (*p3 <= 'z')) ||
			     ((*p3 >= 'A') && (*p3 <= 'Z')) ||
			     ((*p3 >= '0') && (*p3 <= '9')) ||
			     (*p3 == '_'))) {
			    break;
			}
		    }
		    np = p3;
		}
		char temp[(p3 - p) + 1];
		memcpy(temp, p, p3 - p);
		temp[p3 - p] = 0;
		if((env = getenv(temp)) != NULL)
		    bufcatstr(exp, env);
	    }
	    bufcatstr2(exp, np);
	    ret[i] = sstrdup(exp.b);
	}
    }
    ret[i] = NULL;
    buffree(exp);
    return(ret);
}

static int stdhandle(struct child *ch, struct hthead *req, int fd, void (*chinit)(void *), void *idata)
{
    struct stdchild *sd = ch->pdata;
    int serr;
    char **args;
    
    void stdinit(void *data)
    {
	int i;
	
	for(i = 0; sd->envp[i]; i += 2)
	    putenv(sprintf2("%s=%s", sd->envp[i], sd->envp[i + 1]));
	if(chinit != NULL)
	    chinit(data);
    }
    
    if(sd->type == CH_SOCKET) {
	if(sd->fd < 0) {
	    args = expandargs(sd);
	    sd->fd = stdmkchild(args, stdinit, idata);
	    freeca(args);
	}
	if(sendreq2(sd->fd, req, fd, MSG_NOSIGNAL | MSG_DONTWAIT)) {
	    serr = errno;
	    if((serr == EPIPE) || (serr == ECONNRESET)) {
		/* Assume that the child has crashed and restart it. */
		close(sd->fd);
		args = expandargs(sd);
		sd->fd = stdmkchild(args, stdinit, idata);
		freeca(args);
		if(!sendreq2(sd->fd, req, fd, MSG_NOSIGNAL | MSG_DONTWAIT))
		    return(0);
	    }
	    flog(LOG_ERR, "could not pass on request to child %s: %s", ch->name, strerror(serr));
	    if(serr != EAGAIN) {
		close(sd->fd);
		sd->fd = -1;
	    }
	    return(-1);
	}
    } else if(sd->type == CH_FORK) {
	args = expandargs(sd);
	if(stdforkserve(args, req, fd, chinit, idata) < 0) {
	    freeca(args);
	    return(-1);
	}
	freeca(args);
    }
    return(0);
}

static void stdmerge(struct child *dst, struct child *src)
{
    struct stdchild *od, *nd;
    
    if(src->iface == &stdhandler) {
	nd = dst->pdata;
	od = src->pdata;
	nd->fd = od->fd;
	od->fd = -1;
    }
}

static void stddestroy(struct child *ch)
{
    struct stdchild *d = ch->pdata;
    
    if(d->fd >= 0)
	close(d->fd);
    if(d->argv)
	freeca(d->argv);
    if(d->envp)
	freeca(d->envp);
    free(d);
}

struct child *parsechild(struct cfstate *s)
{
    struct child *ch;
    struct stdchild *d;
    struct charvbuf envbuf;
    int i;
    int sl;
    
    sl = s->lno;
    if(!strcmp(s->argv[0], "child")) {
	s->expstart = 1;
	if(s->argc < 2) {
	    flog(LOG_WARNING, "%s:%i: missing name in child declaration", s->file, s->lno);
	    skipcfblock(s);
	    return(NULL);
	}
	ch = newchild(s->argv[1], &stdhandler, omalloc(d));
	d->type = CH_SOCKET;
    } else if(!strcmp(s->argv[0], "fchild")) {
	s->expstart = 1;
	if(s->argc < 2) {
	    flog(LOG_WARNING, "%s:%i: missing name in child declaration", s->file, s->lno);
	    skipcfblock(s);
	    return(NULL);
	}
	ch = newchild(s->argv[1], &stdhandler, omalloc(d));
	d->type = CH_FORK;
    } else {
	return(NULL);
    }
    d->fd = -1;
    
    bufinit(envbuf);
    while(1) {
	getcfline(s);
	if(!strcmp(s->argv[0], "exec")) {
	    if(s->argc < 2) {
		flog(LOG_WARNING, "%s:%i: too few parameters to `exec'", s->file, s->lno);
		continue;
	    }
	    d->argv = szmalloc(sizeof(*d->argv) * s->argc);
	    for(i = 0; i < s->argc - 1; i++)
		d->argv[i] = sstrdup(s->argv[i + 1]);
	} else if(!strcmp(s->argv[0], "env")) {
	    if(s->argc < 3) {
		flog(LOG_WARNING, "%s:%i: too few parameters to `env'", s->file, s->lno);
		continue;
	    }
	    bufadd(envbuf, sstrdup(s->argv[1]));
	    bufadd(envbuf, sstrdup(s->argv[2]));
	} else if(!strcmp(s->argv[0], "end") || !strcmp(s->argv[0], "eof")) {
	    break;
	} else {
	    flog(LOG_WARNING, "%s:%i: unknown directive `%s' in child declaration", s->file, s->lno, s->argv[0]);
	}
    }
    bufadd(envbuf, NULL);
    d->envp = envbuf.b;
    if(d->argv == NULL) {
	flog(LOG_WARNING, "%s:%i: missing `exec' in child declaration %s", s->file, sl, ch->name);
	freechild(ch);
	return(NULL);
    }
    return(ch);
}

int childhandle(struct child *ch, struct hthead *req, int fd, void (*chinit)(void *), void *idata)
{
    return(ch->iface->handle(ch, req, fd, chinit, idata));
}
Commit	Line	Data
06c1a718 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 <stdio.h>
	21	#include <unistd.h>
	22	#include <string.h>
	23	#include <ctype.h>
	24	#include <glob.h>
dd281054	25	#include <libgen.h>
3d74fc07	26	#include <sys/socket.h>
06c1a718 FT	27	#include <errno.h>
	28
	29	#ifdef HAVE_CONFIG_H
	30	#include <config.h>
	31	#endif
	32	#include <utils.h>
	33	#include <cf.h>
	34	#include <mt.h>
	35	#include <proc.h>
	36	#include <log.h>
	37
	38	#define CH_SOCKET 0
	39	#define CH_FORK 1
	40
1924fe8c FT	41	struct stdchild {
	42	int type;
	43	char **argv;
3b77f136	44	char **envp;
1924fe8c FT	45	int fd;
	46	};
	47
dd281054	48	static int parsefile(struct cfstate s, FILE in);
1924fe8c FT	49	static void stdmerge(struct child old, struct child new);
	50	static int stdhandle(struct child ch, struct hthead req, int fd, void (chinit)(void ), void *idata);
	51	static void stddestroy(struct child *ch);
dd281054 FT	52
dd281054 FT	53	static int doinclude(struct cfstate s, char spec)
06c1a718	54	{
dd281054 FT	55	int rv, i;
dd281054 FT	56	FILE *inc;
06c1a718	57	glob_t globm;
dd281054 FT	58	char fbk, dir, *fspec;
	59
	60	rv = 0;
	61	fbk = s->file;
	62	if(spec[0] == '/') {
	63	fspec = spec;
	64	} else {
	65	dir = sstrdup(fbk);
	66	fspec = sprintf3("%s/%s", dirname(dir), spec);
	67	free(dir);
	68	}
	69	if(glob(fspec, 0, NULL, &globm))
	70	return(0);
	71	for(i = 0; i < globm.gl_pathc; i++) {
	72	if((inc = fopen(globm.gl_pathv[i], "r")) != NULL) {
	73	s->file = globm.gl_pathv[i];
	74	if(parsefile(s, inc)) {
	75	fclose(inc);
	76	rv = 1;
	77	goto out;
	78	}
	79	fclose(inc);
	80	inc = NULL;
	81	}
	82	}
	83
	84	out:
	85	globfree(&globm);
	86	s->file = fbk;
	87	return(rv);
	88	}
	89
	90	static int parsefile(struct cfstate s, FILE in)
	91	{
	92	int i;
06c1a718 FT	93	char line[1024];
	94	int eof, argc;
	95	int ind, indst[80], indl;
dd281054	96	char p, *w;
06c1a718 FT	97
	98	s->lno = 0;
	99	indst[indl = 0] = 0;
	100	eof = 0;
	101	while(1) {
	102	if(fgets(line, sizeof(line), in) == NULL) {
	103	eof = 1;
	104	line[0] = 0;
	105	}
	106	s->lno++;
c3b91092 FT	107	if(line[0]) {
	108	for(p = line + strlen(line) - 1; p >= line; p--) {
	109	if(isspace(*p))
	110	*p = 0;
	111	else
	112	break;
	113	}
06c1a718 FT	114	}
	115	for(ind = 0, p = line; *p; p++) {
	116	if(*p == ' ') {
	117	ind++;
	118	} else if(*p == '\t') {
	119	ind = ind - (ind % 8) + 8;
	120	} else {
	121	break;
	122	}
	123	}
	124	if(!eof && (!p \|\| (p == '#')))
	125	continue;
	126
	127	reindent:
	128	if(ind > indst[indl]) {
	129	indst[++indl] = ind;
	130	if(!s->expstart) {
	131	s->res = tokenize("start");
	132	if(yield())
	133	return(1);
	134	} else {
	135	s->expstart = 0;
	136	}
	137	} else {
	138	if(s->expstart) {
	139	s->res = tokenize("end");
	140	if(yield())
	141	return(1);
	142	s->expstart = 0;
	143	}
	144	while(ind < indst[indl]) {
	145	indl--;
	146	s->res = tokenize("end");
	147	if(yield())
	148	return(1);
	149	}
	150	if(ind > indst[indl]) {
	151	flog(LOG_WARNING, "%s:%i: unexpected indentation level", s->file, s->lno);
	152	goto reindent;
	153	}
	154	}
	155
	156	if(eof)
	157	return(0);
	158
	159	argc = calen(w = tokenize(line));
	160	if(argc < 1) {
	161	/* Shouldn't happen, but... */
	162	freeca(w);
	163	continue;
	164	}
	165
	166	if(indl == 0) {
	167	if(!strcmp(w[0], "include")) {
06c1a718	168	for(i = 1; i < argc; i++) {
dd281054 FT	169	if(doinclude(s, w[i])) {
	170	freeca(w);
	171	return(1);
06c1a718 FT	172	}
	173	}
	174	freeca(w);
06c1a718 FT	175	continue;
	176	}
	177	}
	178
	179	if(!strcmp(w[0], "start") \|\|
	180	!strcmp(w[0], "end") \|\|
	181	!strcmp(w[0], "eof")) {
	182	flog(LOG_WARNING, "%s:%i: illegal directive: %s", s->file, s->lno, w[0]);
	183	} else {
	184	s->res = w;
	185	if(yield())
	186	return(1);
	187	}
	188	}
	189	}
	190
	191	static void parsefn(struct muth *mt, va_list args)
	192	{
	193	vavar(struct cfstate *, s);
	194	vavar(FILE *, in);
	195	vavar(char *, file);
	196
	197	s->file = sstrdup(file);
	198	if(parsefile(s, in))
	199	goto out;
	200	do {
	201	s->res = tokenize("eof");
	202	} while(!yield());
	203
	204	out:
	205	free(s->file);
	206	}
	207
	208	char *getcfline(struct cfstate s)
	209	{
	210	freeca(s->argv);
	211	if(s->res == NULL)
	212	resume(s->pf, 0);
	213	s->argc = calen(s->argv = s->res);
	214	s->res = NULL;
	215	return(s->argv);
	216	}
	217
	218	struct cfstate mkcfparser(FILE in, char *name)
	219	{
	220	struct cfstate *s;
	221
	222	omalloc(s);
	223	s->pf = mustart(parsefn, s, in, name);
	224	return(s);
	225	}
	226
	227	void freecfparser(struct cfstate *s)
	228	{
	229	resume(s->pf, -1);
	230	freeca(s->argv);
	231	freeca(s->res);
	232	free(s);
	233	}
	234
0fc6fd13 FT	235	char findstdconf(char name)
0fc6fd13 FT	236	{
f9a65eb2	237	char home, path, p, p2, *t;
0fc6fd13	238
f9a65eb2 FT	239	if((home = getenv("HOME")) != NULL) {
f9a65eb2 FT	240	if(!access(t = sprintf2("%s/.ashd/etc/%s", home, name), R_OK))
13975be5	241	return(t);
13975be5	242	free(t);
0fc6fd13	243	}
f9a65eb2 FT	244	if((path = getenv("PATH")) != NULL) {
	245	path = sstrdup(path);
	246	for(p = strtok(path, ":"); p != NULL; p = strtok(NULL, ":")) {
	247	if((p2 = strrchr(p, '/')) == NULL)
	248	continue;
	249	*p2 = 0;
	250	if(!access(t = sprintf2("%s/etc/%s", p, name), R_OK)) {
	251	free(path);
	252	return(t);
	253	}
	254	free(t);
	255	}
	256	free(path);
	257	}
0fc6fd13 FT	258	return(NULL);
	259	}
	260
1924fe8c	261	struct child newchild(char name, struct chandler iface, void pdata)
06c1a718 FT	262	{
	263	struct child *ch;
	264
	265	omalloc(ch);
	266	ch->name = sstrdup(name);
1924fe8c FT	267	ch->iface = iface;
1924fe8c FT	268	ch->pdata = pdata;
06c1a718 FT	269	return(ch);
	270	}
	271
	272	void freechild(struct child *ch)
	273	{
1924fe8c FT	274	if(ch->iface->destroy != NULL)
1924fe8c FT	275	ch->iface->destroy(ch);
06c1a718 FT	276	if(ch->name != NULL)
06c1a718 FT	277	free(ch->name);
06c1a718 FT	278	free(ch);
	279	}
	280
1924fe8c FT	281	void mergechildren(struct child dst, struct child src)
	282	{
	283	struct child ch1, ch2;
	284
	285	for(ch1 = dst; ch1 != NULL; ch1 = ch1->next) {
	286	for(ch2 = src; ch2 != NULL; ch2 = ch2->next) {
	287	if(ch1->iface->merge && !strcmp(ch1->name, ch2->name)) {
	288	ch1->iface->merge(ch1, ch2);
	289	break;
	290	}
	291	}
	292	}
	293	}
	294
06c1a718 FT	295	void skipcfblock(struct cfstate *s)
	296	{
	297	char **w;
	298
	299	while(1) {
	300	w = getcfline(s);
	301	if(!strcmp(w[0], "end") \|\| !strcmp(w[0], "eof"))
	302	return;
	303	}
	304	}
	305
1924fe8c FT	306	static struct chandler stdhandler = {
	307	.handle = stdhandle,
	308	.merge = stdmerge,
	309	.destroy = stddestroy,
	310	};
	311
b3eb750f FT	312	static char *expandargs(struct stdchild sd)
	313	{
	314	int i;
	315	char *ret, p, p2, p3, np, env;
	316	struct charbuf exp;
	317
	318	ret = szmalloc(sizeof(ret) (calen(sd->argv) + 1));
	319	bufinit(exp);
	320	for(i = 0; sd->argv[i] != NULL; i++) {
	321	if((p = strchr(sd->argv[i], '$')) == NULL) {
	322	ret[i] = sstrdup(sd->argv[i]);
	323	} else {
	324	exp.d = 0;
	325	for(p2 = sd->argv[i]; p != NULL; p2 = np, p = strchr(np, '$')) {
	326	bufcat(exp, p2, p - p2);
	327	if(p[1] == '{') {
	328	if((p3 = strchr((p += 2), '}')) == NULL)
	329	break;
	330	np = p3 + 1;
	331	} else {
	332	for(p3 = ++p; *p3; p3++) {
	333	if(!(((p3 >= 'a') && (p3 <= 'z')) \|\|
	334	((p3 >= 'A') && (p3 <= 'Z')) \|\|
	335	((p3 >= '0') && (p3 <= '9')) \|\|
	336	(*p3 == '_'))) {
	337	break;
	338	}
	339	}
	340	np = p3;
	341	}
	342	char temp[(p3 - p) + 1];
	343	memcpy(temp, p, p3 - p);
	344	temp[p3 - p] = 0;
	345	if((env = getenv(temp)) != NULL)
	346	bufcatstr(exp, env);
	347	}
	348	bufcatstr2(exp, np);
	349	ret[i] = sstrdup(exp.b);
	350	}
	351	}
	352	ret[i] = NULL;
	353	buffree(exp);
	354	return(ret);
	355	}
	356
1924fe8c FT	357	static int stdhandle(struct child ch, struct hthead req, int fd, void (chinit)(void ), void *idata)
1924fe8c FT	358	{
3b77f136	359	struct stdchild *sd = ch->pdata;
45b19d96	360	int serr;
b3eb750f	361	char **args;
1924fe8c	362
3b77f136 FT	363	void stdinit(void *data)
	364	{
	365	int i;
	366
	367	for(i = 0; sd->envp[i]; i += 2)
	368	putenv(sprintf2("%s=%s", sd->envp[i], sd->envp[i + 1]));
209dfd8b FT	369	if(chinit != NULL)
209dfd8b FT	370	chinit(data);
3b77f136 FT	371	}
	372
	373	if(sd->type == CH_SOCKET) {
b3eb750f FT	374	if(sd->fd < 0) {
	375	args = expandargs(sd);
	376	sd->fd = stdmkchild(args, stdinit, idata);
	377	freeca(args);
	378	}
3b77f136	379	if(sendreq2(sd->fd, req, fd, MSG_NOSIGNAL \| MSG_DONTWAIT)) {
45b19d96 FT	380	serr = errno;
45b19d96 FT	381	if((serr == EPIPE) \|\| (serr == ECONNRESET)) {
1924fe8c	382	/* Assume that the child has crashed and restart it. */
3b77f136	383	close(sd->fd);
b3eb750f FT	384	args = expandargs(sd);
	385	sd->fd = stdmkchild(args, stdinit, idata);
	386	freeca(args);
3b77f136	387	if(!sendreq2(sd->fd, req, fd, MSG_NOSIGNAL \| MSG_DONTWAIT))
1924fe8c FT	388	return(0);
1924fe8c FT	389	}
45b19d96 FT	390	flog(LOG_ERR, "could not pass on request to child %s: %s", ch->name, strerror(serr));
45b19d96 FT	391	if(serr != EAGAIN) {
3b77f136 FT	392	close(sd->fd);
3b77f136 FT	393	sd->fd = -1;
fc35a3ef	394	}
1924fe8c FT	395	return(-1);
1924fe8c FT	396	}
3b77f136	397	} else if(sd->type == CH_FORK) {
b3eb750f FT	398	args = expandargs(sd);
	399	if(stdforkserve(args, req, fd, chinit, idata) < 0) {
	400	freeca(args);
1924fe8c	401	return(-1);
b3eb750f FT	402	}
b3eb750f FT	403	freeca(args);
1924fe8c FT	404	}
	405	return(0);
	406	}
	407
	408	static void stdmerge(struct child dst, struct child src)
	409	{
	410	struct stdchild od, nd;
	411
	412	if(src->iface == &stdhandler) {
	413	nd = dst->pdata;
	414	od = src->pdata;
	415	nd->fd = od->fd;
	416	od->fd = -1;
	417	}
	418	}
	419
	420	static void stddestroy(struct child *ch)
	421	{
	422	struct stdchild *d = ch->pdata;
	423
	424	if(d->fd >= 0)
	425	close(d->fd);
	426	if(d->argv)
	427	freeca(d->argv);
3b77f136 FT	428	if(d->envp)
3b77f136 FT	429	freeca(d->envp);
1924fe8c FT	430	free(d);
	431	}
	432
06c1a718 FT	433	struct child parsechild(struct cfstate s)
	434	{
	435	struct child *ch;
1924fe8c	436	struct stdchild *d;
3b77f136	437	struct charvbuf envbuf;
06c1a718 FT	438	int i;
	439	int sl;
	440
	441	sl = s->lno;
	442	if(!strcmp(s->argv[0], "child")) {
	443	s->expstart = 1;
	444	if(s->argc < 2) {
	445	flog(LOG_WARNING, "%s:%i: missing name in child declaration", s->file, s->lno);
	446	skipcfblock(s);
	447	return(NULL);
	448	}
1924fe8c FT	449	ch = newchild(s->argv[1], &stdhandler, omalloc(d));
1924fe8c FT	450	d->type = CH_SOCKET;
06c1a718 FT	451	} else if(!strcmp(s->argv[0], "fchild")) {
	452	s->expstart = 1;
	453	if(s->argc < 2) {
	454	flog(LOG_WARNING, "%s:%i: missing name in child declaration", s->file, s->lno);
	455	skipcfblock(s);
	456	return(NULL);
	457	}
1924fe8c FT	458	ch = newchild(s->argv[1], &stdhandler, omalloc(d));
1924fe8c FT	459	d->type = CH_FORK;
06c1a718 FT	460	} else {
	461	return(NULL);
	462	}
1924fe8c	463	d->fd = -1;
06c1a718	464
3b77f136	465	bufinit(envbuf);
06c1a718 FT	466	while(1) {
	467	getcfline(s);
	468	if(!strcmp(s->argv[0], "exec")) {
	469	if(s->argc < 2) {
	470	flog(LOG_WARNING, "%s:%i: too few parameters to `exec'", s->file, s->lno);
	471	continue;
	472	}
1924fe8c	473	d->argv = szmalloc(sizeof(d->argv) s->argc);
06c1a718	474	for(i = 0; i < s->argc - 1; i++)
1924fe8c	475	d->argv[i] = sstrdup(s->argv[i + 1]);
3b77f136 FT	476	} else if(!strcmp(s->argv[0], "env")) {
	477	if(s->argc < 3) {
	478	flog(LOG_WARNING, "%s:%i: too few parameters to `env'", s->file, s->lno);
	479	continue;
	480	}
	481	bufadd(envbuf, sstrdup(s->argv[1]));
	482	bufadd(envbuf, sstrdup(s->argv[2]));
06c1a718 FT	483	} else if(!strcmp(s->argv[0], "end") \|\| !strcmp(s->argv[0], "eof")) {
	484	break;
	485	} else {
	486	flog(LOG_WARNING, "%s:%i: unknown directive `%s' in child declaration", s->file, s->lno, s->argv[0]);
	487	}
	488	}
3b77f136 FT	489	bufadd(envbuf, NULL);
3b77f136 FT	490	d->envp = envbuf.b;
1924fe8c	491	if(d->argv == NULL) {
06c1a718 FT	492	flog(LOG_WARNING, "%s:%i: missing `exec' in child declaration %s", s->file, sl, ch->name);
	493	freechild(ch);
	494	return(NULL);
	495	}
	496	return(ch);
	497	}
	498
6a7a868e	499	int childhandle(struct child ch, struct hthead req, int fd, void (chinit)(void ), void *idata)
06c1a718	500	{
1924fe8c	501	return(ch->iface->handle(ch, req, fd, chinit, idata));
06c1a718	502	}