[ashd.git] / src / patplex.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 <string.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <ctype.h>
#include <regex.h>

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

#define PAT_REST 0
#define PAT_URL 1
#define PAT_METHOD 2
#define PAT_HEADER 3
#define PAT_ALL 4
#define PAT_DEFAULT 5

#define PATFL_MSS 1

struct config {
    struct child *children;
    struct pattern *patterns;
};

struct rule {
    int type;
    int fl;
    char *header;
    regex_t *pattern;
};

struct pattern {
    struct pattern *next;
    char *childnm;
    struct rule **rules;
    char *restpat;
};

static struct config *gconfig, *lconfig;
static volatile int reload = 0;

static void freepattern(struct pattern *pat)
{
    struct rule **rule;
    
    for(rule = pat->rules; *rule; rule++) {
	if((*rule)->header != NULL)
	    free((*rule)->header);
	if((*rule)->pattern != NULL) {
	    regfree((*rule)->pattern);
	    free((*rule)->pattern);
	}
	free(*rule);
    }
    if(pat->childnm != NULL)
	free(pat->childnm);
    free(pat);
}

static void freeconfig(struct config *cf)
{
    struct child *ch, *nch;
    struct pattern *pat, *npat;
    
    for(ch = cf->children; ch != NULL; ch = nch) {
	nch = ch->next;
	freechild(ch);
    }
    for(pat = cf->patterns; pat != NULL; pat = npat) {
	npat = pat->next;
	freepattern(pat);
    }
    free(cf);
}

static struct child *getchild(struct config *cf, char *name)
{
    struct child *ch;
    
    for(ch = cf->children; ch; ch = ch->next) {
	if(!strcmp(ch->name, name))
	    break;
    }
    return(ch);
}

static struct rule *newrule(struct pattern *pat)
{
    int i;
    struct rule *rule;
    
    for(i = 0; pat->rules[i]; i++);
    pat->rules = srealloc(pat->rules, sizeof(*pat->rules) * (i + 2));
    rule = pat->rules[i] = szmalloc(sizeof(*rule));
    pat->rules[i + 1] = NULL;
    return(rule);
}

static struct pattern *newpattern(void)
{
    struct pattern *pat;
    
    omalloc(pat);
    pat->rules = szmalloc(sizeof(*pat->rules));
    return(pat);
}

static regex_t *regalloc(char *regex, int flags)
{
    regex_t *ret;
    int res;
    char errbuf[256];
    
    omalloc(ret);
    if((res = regcomp(ret, regex, flags | REG_EXTENDED)) != 0) {
	regerror(res, ret, errbuf, sizeof(errbuf));
	flog(LOG_WARNING, "%s: %s", regex, errbuf);
	free(ret);
	return(NULL);
    }
    return(ret);
}

static struct pattern *parsepattern(struct cfstate *s)
{
    struct pattern *pat;
    int sl;
    struct rule *rule;
    regex_t *regex;
    int rxfl;
    
    if(!strcmp(s->argv[0], "match")) {
	s->expstart = 1;
	pat = newpattern();
    } else {
	return(NULL);
    }
    
    sl = s->lno;
    while(1) {
	getcfline(s);
	if(!strcmp(s->argv[0], "point") ||
	   !strcmp(s->argv[0], "url") ||
	   !strcmp(s->argv[0], "method")) {
	    if(s->argc < 2) {
		flog(LOG_WARNING, "%s:%i: missing pattern for `%s' match", s->file, s->lno, s->argv[0]);
		continue;
	    }
	    if(s->argc >= 3) {
		if(strchr(s->argv[2], 'i'))
		    rxfl |= REG_ICASE;
	    }
	    if((regex = regalloc(s->argv[1], rxfl)) == NULL) {
		flog(LOG_WARNING, "%s:%i: invalid regex for `%s' match", s->file, s->lno, s->argv[0]);
		continue;
	    }
	    rule = newrule(pat);
	    if(!strcmp(s->argv[0], "point"))
		rule->type = PAT_REST;
	    else if(!strcmp(s->argv[0], "url"))
		rule->type = PAT_URL;
	    else if(!strcmp(s->argv[0], "method"))
		rule->type = PAT_METHOD;
	    rule->pattern = regex;
	    if(s->argc >= 3) {
		if(strchr(s->argv[2], 's'))
		    rule->fl |= PATFL_MSS;
	    }
	} else if(!strcmp(s->argv[0], "header")) {
	    if(s->argc < 3) {
		flog(LOG_WARNING, "%s:%i: missing header name or pattern for `header' match", s->file, s->lno);
		continue;
	    }
	    if(s->argc >= 4) {
		if(strchr(s->argv[3], 'i'))
		    rxfl |= REG_ICASE;
	    }
	    if((regex = regalloc(s->argv[2], rxfl)) == NULL) {
		flog(LOG_WARNING, "%s:%i: invalid regex for `header' match", s->file, s->lno);
		continue;
	    }
	    rule = newrule(pat);
	    rule->type = PAT_HEADER;
	    rule->header = sstrdup(s->argv[1]);
	    rule->pattern = regex;
	    if(s->argc >= 4) {
		if(strchr(s->argv[3], 's'))
		    rule->fl |= PATFL_MSS;
	    }
	} else if(!strcmp(s->argv[0], "all")) {
	    newrule(pat)->type = PAT_ALL;
	} else if(!strcmp(s->argv[0], "default")) {
	    newrule(pat)->type = PAT_DEFAULT;
	} else if(!strcmp(s->argv[0], "handler")) {
	    if(s->argc < 2) {
		flog(LOG_WARNING, "%s:%i: missing child name for `handler' directive", s->file, s->lno);
		continue;
	    }
	    if(pat->childnm != NULL)
		free(pat->childnm);
	    pat->childnm = sstrdup(s->argv[1]);
	} else if(!strcmp(s->argv[0], "restpat")) {
	    if(s->argc < 2) {
		flog(LOG_WARNING, "%s:%i: missing pattern for `restpat' directive", s->file, s->lno);
		continue;
	    }
	    if(pat->restpat != NULL)
		free(pat->restpat);
	    pat->restpat = sstrdup(s->argv[1]);
	} else if(!strcmp(s->argv[0], "end") || !strcmp(s->argv[0], "eof")) {
	    break;
	} else {
	    flog(LOG_WARNING, "%s:%i: unknown directive `%s' in pattern declaration", s->file, s->lno, s->argv[0]);
	}
    }
    
    if(pat->rules[0] == NULL) {
	flog(LOG_WARNING, "%s:%i: missing rules in match declaration", s->file, sl);
	freepattern(pat);
	return(NULL);
    }
    if(pat->childnm == NULL) {
	flog(LOG_WARNING, "%s:%i: missing handler in match declaration", s->file, sl);
	freepattern(pat);
	return(NULL);
    }
    return(pat);
}

static struct config *readconfig(char *filename)
{
    struct cfstate *s;
    struct config *cf;
    struct child *ch;
    struct pattern *pat;
    FILE *in;
    
    if((in = fopen(filename, "r")) == NULL) {
	flog(LOG_WARNING, "%s: %s", filename, strerror(errno));
	return(NULL);
    }
    s = mkcfparser(in, filename);
    omalloc(cf);
    
    while(1) {
	getcfline(s);
	if((ch = parsechild(s)) != NULL) {
	    ch->next = cf->children;
	    cf->children = ch;
	} else if((pat = parsepattern(s)) != NULL) {
	    pat->next = cf->patterns;
	    cf->patterns = pat;
	} else if(!strcmp(s->argv[0], "eof")) {
	    break;
	} else {
	    flog(LOG_WARNING, "%s:%i: unknown directive `%s'", s->file, s->lno, s->argv[0]);
	}
    }
    
    freecfparser(s);
    fclose(in);
    return(cf);
}

static void exprestpat(struct hthead *req, struct pattern *pat, char **mstr)
{
    char *p, *p2, *hdr;
    int mc;
    struct charbuf buf;
    
    if(mstr == NULL)
	mc = 0;
    else
	for(mc = 0; mstr[mc]; mc++);
    bufinit(buf);
    for(p = pat->restpat; *p; ) {
	if(*p == '$') {
	    p++;
	    if((*p >= '0') && (*p <= '9')) {
		if(*p - '0' < mc)
		    bufcatstr(buf, mstr[*p - '0']);
		p++;
	    } else if(*p == '_') {
		bufcatstr(buf, req->rest);
		p++;
	    } else if(*p == '$') {
		bufadd(buf, '$');
		p++;
	    } else if(*p == '{') {
		if((p2 = strchr(p, '}')) == NULL) {
		    p++;
		} else {
		    hdr = getheader(req, sprintf3("%.*s", p2 - p - 1, p + 1));
		    if(hdr)
			bufcatstr(buf, hdr);
		}
	    } else if(!*p) {
	    }
	} else {
	    bufadd(buf, *(p++));
	}
    }
    bufadd(buf, 0);
    replrest(req, buf.b);
    buffree(buf);
}

static char *findmatch(struct config *cf, struct hthead *req, int trydefault)
{
    int i, o;
    struct pattern *pat;
    struct rule *rule;
    int rmo, matched;
    char *pstr;
    char **mstr;
    regmatch_t gr[10];
    
    mstr = NULL;
    for(pat = cf->patterns; pat != NULL; pat = pat->next) {
	rmo = -1;
	for(i = 0; (rule = pat->rules[i]) != NULL; i++) {
	    matched = 0;
	    if(rule->type == PAT_REST) {
		if((matched = !regexec(rule->pattern, pstr = req->rest, 10, gr, 0)))
		    rmo = gr[0].rm_eo;
		else
		    break;
	    } else if(rule->type == PAT_URL) {
		if(!(matched = !regexec(rule->pattern, pstr = req->url, 10, gr, 0)))
		    break;
	    } else if(rule->type == PAT_METHOD) {
		if(!(matched = !regexec(rule->pattern, pstr = req->method, 10, gr, 0)))
		    break;
	    } else if(rule->type == PAT_HEADER) {
		if(!(pstr = getheader(req, rule->header)))
		    break;
		if(!(matched = !regexec(rule->pattern, pstr, 10, gr, 0)))
		    break;
	    } else if(rule->type == PAT_ALL) {
	    } else if(rule->type == PAT_DEFAULT) {
		if(!trydefault)
		    break;
	    }
	    if(matched && (rule->fl & PATFL_MSS)) {
		if(mstr) {
		    flog(LOG_WARNING, "two pattern rules marked with `s' flag found (for handler %s)", pat->childnm);
		    freeca(mstr);
		}
		for(o = 0; o < 10; o++) {
		    if(gr[o].rm_so < 0)
			break;
		}
		mstr = szmalloc((o + 1) * sizeof(*mstr));
		for(o = 0; o < 10; o++) {
		    if(gr[o].rm_so < 0)
			break;
		    mstr[o] = smalloc(gr[o].rm_eo - gr[o].rm_so + 1);
		    memcpy(mstr[o], pstr + gr[o].rm_so, gr[o].rm_eo - gr[o].rm_so);
		    mstr[o][gr[o].rm_eo - gr[o].rm_so] = 0;
		}
	    }
	}
	if(!rule) {
	    if(pat->restpat) {
		exprestpat(req, pat, mstr);
	    } else if(rmo != -1) {
		replrest(req, req->rest + rmo);
	    }
	    if(mstr)
		freeca(mstr);
	    return(pat->childnm);
	}
	if(mstr) {
	    freeca(mstr);
	    mstr = NULL;
	}
    }
    return(NULL);
}

static void serve(struct hthead *req, int fd)
{
    char *chnm;
    struct child *ch;
    
    chnm = NULL;
    if(chnm == NULL)
	chnm = findmatch(lconfig, req, 0);
    if(chnm == NULL)
	chnm = findmatch(lconfig, req, 1);
    if(gconfig != NULL) {
	if(chnm == NULL)
	    chnm = findmatch(gconfig, req, 0);
	if(chnm == NULL)
	    chnm = findmatch(gconfig, req, 1);
    }
    if(chnm == NULL) {
	simpleerror(fd, 404, "Not Found", "The requested resource could not be found on this server.");
	return;
    }
    ch = NULL;
    if(ch == NULL)
	ch = getchild(lconfig, chnm);
    if(gconfig != NULL) {
	if(ch == NULL)
	    ch = getchild(gconfig, chnm);
    }
    if(ch == NULL) {
	flog(LOG_ERR, "child %s requested, but was not declared", chnm);
	simpleerror(fd, 500, "Configuration Error", "The server is erroneously configured. Handler %s was requested, but not declared.", chnm);
	return;
    }
    
    if(childhandle(ch, req, fd))
	simpleerror(fd, 500, "Server Error", "The request handler crashed.");
}

static void reloadconf(char *nm)
{
    struct config *cf;
    struct child *ch1, *ch2;
    
    if((cf = readconfig(nm)) == NULL) {
	flog(LOG_WARNING, "could not reload configuration file `%s'", nm);
	return;
    }
    for(ch1 = cf->children; ch1 != NULL; ch1 = ch1->next) {
	for(ch2 = lconfig->children; ch2 != NULL; ch2 = ch2->next) {
	    if(!strcmp(ch1->name, ch2->name)) {
		ch1->fd = ch2->fd;
		ch2->fd = -1;
		break;
	    }
	}
    }
    freeconfig(lconfig);
    lconfig = cf;
}

static void sighandler(int sig)
{
    if(sig == SIGHUP)
	reload = 1;
}

static void usage(FILE *out)
{
    fprintf(out, "usage: patplex [-hN] CONFIGFILE\n");
}

int main(int argc, char **argv)
{
    int c;
    int nodef;
    char *gcf;
    struct hthead *req;
    int fd;
    
    nodef = 0;
    while((c = getopt(argc, argv, "hN")) >= 0) {
	switch(c) {
	case 'h':
	    usage(stdout);
	    exit(0);
	case 'N':
	    nodef = 1;
	    break;
	default:
	    usage(stderr);
	    exit(1);
	}
    }
    if(argc - optind < 1) {
	usage(stderr);
	exit(1);
    }
    if(!nodef) {
	if((gcf = findstdconf("ashd/patplex.rc")) != NULL) {
	    gconfig = readconfig(gcf);
	    free(gcf);
	}
    }
    if((lconfig = readconfig(argv[optind])) == NULL) {
	flog(LOG_ERR, "could not read `%s'", argv[optind]);
	exit(1);
    }
    signal(SIGCHLD, SIG_IGN);
    signal(SIGHUP, sighandler);
    while(1) {
	if(reload) {
	    reloadconf(argv[optind]);
	    reload = 0;
	}
	if((fd = recvreq(0, &req)) < 0) {
	    if(errno == EINTR)
		continue;
	    if(errno != 0)
		flog(LOG_ERR, "recvreq: %s", strerror(errno));
	    break;
	}
	serve(req, fd);
	freehthead(req);
	close(fd);
    }
    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 <stdio.h>
	21	#include <string.h>
	22	#include <unistd.h>
	23	#include <signal.h>
	24	#include <errno.h>
	25	#include <ctype.h>
	26	#include <regex.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	#include <proc.h>
	35	#include <resp.h>
	36	#include <cf.h>
	37
	38	#define PAT_REST 0
	39	#define PAT_URL 1
	40	#define PAT_METHOD 2
	41	#define PAT_HEADER 3
	42	#define PAT_ALL 4
	43	#define PAT_DEFAULT 5
	44
	45	#define PATFL_MSS 1
	46
	47	struct config {
	48	struct child *children;
	49	struct pattern *patterns;
	50	};
	51
	52	struct rule {
	53	int type;
	54	int fl;
	55	char *header;
	56	regex_t *pattern;
	57	};
	58
	59	struct pattern {
	60	struct pattern *next;
	61	char *childnm;
	62	struct rule **rules;
	63	char *restpat;
	64	};
	65
	66	static struct config gconfig, lconfig;
	67	static volatile int reload = 0;
	68
	69	static void freepattern(struct pattern *pat)
	70	{
	71	struct rule **rule;
	72
	73	for(rule = pat->rules; *rule; rule++) {
	74	if((*rule)->header != NULL)
	75	free((*rule)->header);
	76	if((*rule)->pattern != NULL) {
	77	regfree((*rule)->pattern);
	78	free((*rule)->pattern);
	79	}
	80	free(*rule);
	81	}
	82	if(pat->childnm != NULL)
	83	free(pat->childnm);
	84	free(pat);
	85	}
	86
	87	static void freeconfig(struct config *cf)
	88	{
	89	struct child ch, nch;
	90	struct pattern pat, npat;
	91
	92	for(ch = cf->children; ch != NULL; ch = nch) {
	93	nch = ch->next;
	94	freechild(ch);
	95	}
	96	for(pat = cf->patterns; pat != NULL; pat = npat) {
	97	npat = pat->next;
	98	freepattern(pat);
	99	}
	100	free(cf);
	101	}
	102
	103	static struct child getchild(struct config cf, char *name)
	104	{
	105	struct child *ch;
	106
	107	for(ch = cf->children; ch; ch = ch->next) {
	108	if(!strcmp(ch->name, name))
	109	break;
	110	}
	111	return(ch);
	112	}
	113
	114	static struct rule newrule(struct pattern pat)
	115	{
	116	int i;
	117	struct rule *rule;
	118
	119	for(i = 0; pat->rules[i]; i++);
	120	pat->rules = srealloc(pat->rules, sizeof(pat->rules) (i + 2));
	121	rule = pat->rules[i] = szmalloc(sizeof(*rule));
	122	pat->rules[i + 1] = NULL;
	123	return(rule);
	124	}
	125
	126	static struct pattern *newpattern(void)
	127	{
	128	struct pattern *pat;
	129
	130	omalloc(pat);
	131	pat->rules = szmalloc(sizeof(*pat->rules));
	132	return(pat);
	133	}
	134
	135	static regex_t regalloc(char regex, int flags)
	136	{
	137	regex_t *ret;
	138	int res;
	139	char errbuf[256];
	140
	141	omalloc(ret);
	142	if((res = regcomp(ret, regex, flags \| REG_EXTENDED)) != 0) {
	143	regerror(res, ret, errbuf, sizeof(errbuf));
	144	flog(LOG_WARNING, "%s: %s", regex, errbuf);
	145	free(ret);
	146	return(NULL);
	147	}
	148	return(ret);
	149	}
	150
	151	static struct pattern parsepattern(struct cfstate s)
	152	{
	153	struct pattern *pat;
	154	int sl;
	155	struct rule *rule;
	156	regex_t *regex;
	157	int rxfl;
	158
	159	if(!strcmp(s->argv[0], "match")) {
	160	s->expstart = 1;
	161	pat = newpattern();
	162	} else {
	163	return(NULL);
	164	}
	165
	166	sl = s->lno;
	167	while(1) {
	168	getcfline(s);
	169	if(!strcmp(s->argv[0], "point") \|\|
	170	!strcmp(s->argv[0], "url") \|\|
	171	!strcmp(s->argv[0], "method")) {
	172	if(s->argc < 2) {
	173	flog(LOG_WARNING, "%s:%i: missing pattern for `%s' match", s->file, s->lno, s->argv[0]);
	174	continue;
	175	}
	176	if(s->argc >= 3) {
	177	if(strchr(s->argv[2], 'i'))
	178	rxfl \|= REG_ICASE;
	179	}
	180	if((regex = regalloc(s->argv[1], rxfl)) == NULL) {
	181	flog(LOG_WARNING, "%s:%i: invalid regex for `%s' match", s->file, s->lno, s->argv[0]);
	182	continue;
	183	}
	184	rule = newrule(pat);
	185	if(!strcmp(s->argv[0], "point"))
	186	rule->type = PAT_REST;
	187	else if(!strcmp(s->argv[0], "url"))
	188	rule->type = PAT_URL;
	189	else if(!strcmp(s->argv[0], "method"))
	190	rule->type = PAT_METHOD;
	191	rule->pattern = regex;
	192	if(s->argc >= 3) {
	193	if(strchr(s->argv[2], 's'))
	194	rule->fl \|= PATFL_MSS;
	195	}
	196	} else if(!strcmp(s->argv[0], "header")) {
	197	if(s->argc < 3) {
	198	flog(LOG_WARNING, "%s:%i: missing header name or pattern for `header' match", s->file, s->lno);
	199	continue;
	200	}
	201	if(s->argc >= 4) {
	202	if(strchr(s->argv[3], 'i'))
	203	rxfl \|= REG_ICASE;
	204	}
	205	if((regex = regalloc(s->argv[2], rxfl)) == NULL) {
	206	flog(LOG_WARNING, "%s:%i: invalid regex for `header' match", s->file, s->lno);
	207	continue;
	208	}
	209	rule = newrule(pat);
	210	rule->type = PAT_HEADER;
	211	rule->header = sstrdup(s->argv[1]);
	212	rule->pattern = regex;
	213	if(s->argc >= 4) {
	214	if(strchr(s->argv[3], 's'))
	215	rule->fl \|= PATFL_MSS;
	216	}
	217	} else if(!strcmp(s->argv[0], "all")) {
	218	newrule(pat)->type = PAT_ALL;
	219	} else if(!strcmp(s->argv[0], "default")) {
	220	newrule(pat)->type = PAT_DEFAULT;
	221	} else if(!strcmp(s->argv[0], "handler")) {
	222	if(s->argc < 2) {
	223	flog(LOG_WARNING, "%s:%i: missing child name for `handler' directive", s->file, s->lno);
	224	continue;
	225	}
	226	if(pat->childnm != NULL)
	227	free(pat->childnm);
	228	pat->childnm = sstrdup(s->argv[1]);
	229	} else if(!strcmp(s->argv[0], "restpat")) {
	230	if(s->argc < 2) {
	231	flog(LOG_WARNING, "%s:%i: missing pattern for `restpat' directive", s->file, s->lno);
	232	continue;
	233	}
	234	if(pat->restpat != NULL)
	235	free(pat->restpat);
	236	pat->restpat = sstrdup(s->argv[1]);
	237	} else if(!strcmp(s->argv[0], "end") \|\| !strcmp(s->argv[0], "eof")) {
	238	break;
	239	} else {
	240	flog(LOG_WARNING, "%s:%i: unknown directive `%s' in pattern declaration", s->file, s->lno, s->argv[0]);
	241	}
	242	}
	243
	244	if(pat->rules[0] == NULL) {
	245	flog(LOG_WARNING, "%s:%i: missing rules in match declaration", s->file, sl);
	246	freepattern(pat);
	247	return(NULL);
	248	}
	249	if(pat->childnm == NULL) {
	250	flog(LOG_WARNING, "%s:%i: missing handler in match declaration", s->file, sl);
	251	freepattern(pat);
	252	return(NULL);
	253	}
	254	return(pat);
	255	}
	256
	257	static struct config readconfig(char filename)
	258	{
	259	struct cfstate *s;
	260	struct config *cf;
	261	struct child *ch;
	262	struct pattern *pat;
	263	FILE *in;
	264
	265	if((in = fopen(filename, "r")) == NULL) {
	266	flog(LOG_WARNING, "%s: %s", filename, strerror(errno));
	267	return(NULL);
	268	}
	269	s = mkcfparser(in, filename);
	270	omalloc(cf);
	271
	272	while(1) {
	273	getcfline(s);
	274	if((ch = parsechild(s)) != NULL) {
	275	ch->next = cf->children;
	276	cf->children = ch;
	277	} else if((pat = parsepattern(s)) != NULL) {
	278	pat->next = cf->patterns;
	279	cf->patterns = pat;
	280	} else if(!strcmp(s->argv[0], "eof")) {
	281	break;
	282	} else {
	283	flog(LOG_WARNING, "%s:%i: unknown directive `%s'", s->file, s->lno, s->argv[0]);
	284	}
	285	}
	286
	287	freecfparser(s);
	288	fclose(in);
	289	return(cf);
	290	}
	291
	292	static void exprestpat(struct hthead req, struct pattern pat, char **mstr)
	293	{
	294	char p, p2, *hdr;
	295	int mc;
	296	struct charbuf buf;
	297
	298	if(mstr == NULL)
	299	mc = 0;
	300	else
	301	for(mc = 0; mstr[mc]; mc++);
	302	bufinit(buf);
	303	for(p = pat->restpat; *p; ) {
	304	if(*p == '$') {
	305	p++;
	306	if((p >= '0') && (p <= '9')) {
	307	if(*p - '0' < mc)
	308	bufcatstr(buf, mstr[*p - '0']);
	309	p++;
	310	} else if(*p == '_') {
	311	bufcatstr(buf, req->rest);
	312	p++;
	313	} else if(*p == '$') {
	314	bufadd(buf, '$');
	315	p++;
	316	} else if(*p == '{') {
	317	if((p2 = strchr(p, '}')) == NULL) {
	318	p++;
	319	} else {
	320	hdr = getheader(req, sprintf3("%.*s", p2 - p - 1, p + 1));
	321	if(hdr)
	322	bufcatstr(buf, hdr);
	323	}
	324	} else if(!*p) {
	325	}
	326	} else {
	327	bufadd(buf, *(p++));
	328	}
	329	}
	330	bufadd(buf, 0);
	331	replrest(req, buf.b);
	332	buffree(buf);
	333	}
	334
	335	static char findmatch(struct config cf, struct hthead *req, int trydefault)
	336	{
	337	int i, o;
	338	struct pattern *pat;
	339	struct rule *rule;
	340	int rmo, matched;
	341	char *pstr;
	342	char **mstr;
	343	regmatch_t gr[10];
	344
	345	mstr = NULL;
	346	for(pat = cf->patterns; pat != NULL; pat = pat->next) {
	347	rmo = -1;
	348	for(i = 0; (rule = pat->rules[i]) != NULL; i++) {
	349	matched = 0;
	350	if(rule->type == PAT_REST) {
	351	if((matched = !regexec(rule->pattern, pstr = req->rest, 10, gr, 0)))
	352	rmo = gr[0].rm_eo;
	353	else
	354	break;
	355	} else if(rule->type == PAT_URL) {
	356	if(!(matched = !regexec(rule->pattern, pstr = req->url, 10, gr, 0)))
	357	break;
	358	} else if(rule->type == PAT_METHOD) {
	359	if(!(matched = !regexec(rule->pattern, pstr = req->method, 10, gr, 0)))
	360	break;
	361	} else if(rule->type == PAT_HEADER) {
	362	if(!(pstr = getheader(req, rule->header)))
	363	break;
	364	if(!(matched = !regexec(rule->pattern, pstr, 10, gr, 0)))
	365	break;
	366	} else if(rule->type == PAT_ALL) {
	367	} else if(rule->type == PAT_DEFAULT) {
	368	if(!trydefault)
	369	break;
	370	}
	371	if(matched && (rule->fl & PATFL_MSS)) {
	372	if(mstr) {
	373	flog(LOG_WARNING, "two pattern rules marked with `s' flag found (for handler %s)", pat->childnm);
	374	freeca(mstr);
	375	}
	376	for(o = 0; o < 10; o++) {
	377	if(gr[o].rm_so < 0)
	378	break;
	379	}
	380	mstr = szmalloc((o + 1) * sizeof(*mstr));
	381	for(o = 0; o < 10; o++) {
	382	if(gr[o].rm_so < 0)
	383	break;
	384	mstr[o] = smalloc(gr[o].rm_eo - gr[o].rm_so + 1);
	385	memcpy(mstr[o], pstr + gr[o].rm_so, gr[o].rm_eo - gr[o].rm_so);
	386	mstr[o][gr[o].rm_eo - gr[o].rm_so] = 0;
	387	}
	388	}
	389	}
	390	if(!rule) {
	391	if(pat->restpat) {
	392	exprestpat(req, pat, mstr);
	393	} else if(rmo != -1) {
	394	replrest(req, req->rest + rmo);
	395	}
	396	if(mstr)
	397	freeca(mstr);
	398	return(pat->childnm);
	399	}
	400	if(mstr) {
	401	freeca(mstr);
	402	mstr = NULL;
	403	}
	404	}
	405	return(NULL);
	406	}
	407
	408	static void serve(struct hthead *req, int fd)
	409	{
	410	char *chnm;
	411	struct child *ch;
	412
	413	chnm = NULL;
	414	if(chnm == NULL)
	415	chnm = findmatch(lconfig, req, 0);
	416	if(chnm == NULL)
	417	chnm = findmatch(lconfig, req, 1);
	418	if(gconfig != NULL) {
	419	if(chnm == NULL)
	420	chnm = findmatch(gconfig, req, 0);
	421	if(chnm == NULL)
	422	chnm = findmatch(gconfig, req, 1);
	423	}
	424	if(chnm == NULL) {
	425	simpleerror(fd, 404, "Not Found", "The requested resource could not be found on this server.");
	426	return;
	427	}
	428	ch = NULL;
	429	if(ch == NULL)
	430	ch = getchild(lconfig, chnm);
	431	if(gconfig != NULL) {
	432	if(ch == NULL)
	433	ch = getchild(gconfig, chnm);
	434	}
	435	if(ch == NULL) {
	436	flog(LOG_ERR, "child %s requested, but was not declared", chnm);
	437	simpleerror(fd, 500, "Configuration Error", "The server is erroneously configured. Handler %s was requested, but not declared.", chnm);
	438	return;
	439	}
	440
	441	if(childhandle(ch, req, fd))
	442	simpleerror(fd, 500, "Server Error", "The request handler crashed.");
	443	}
	444
	445	static void reloadconf(char *nm)
	446	{
	447	struct config *cf;
	448	struct child ch1, ch2;
	449
	450	if((cf = readconfig(nm)) == NULL) {
	451	flog(LOG_WARNING, "could not reload configuration file `%s'", nm);
	452	return;
	453	}
	454	for(ch1 = cf->children; ch1 != NULL; ch1 = ch1->next) {
	455	for(ch2 = lconfig->children; ch2 != NULL; ch2 = ch2->next) {
	456	if(!strcmp(ch1->name, ch2->name)) {
	457	ch1->fd = ch2->fd;
	458	ch2->fd = -1;
	459	break;
	460	}
	461	}
	462	}
	463	freeconfig(lconfig);
	464	lconfig = cf;
	465	}
	466
	467	static void sighandler(int sig)
	468	{
	469	if(sig == SIGHUP)
	470	reload = 1;
	471	}
	472
	473	static void usage(FILE *out)
	474	{
	475	fprintf(out, "usage: patplex [-hN] CONFIGFILE\n");
	476	}
	477
	478	int main(int argc, char **argv)
	479	{
	480	int c;
	481	int nodef;
	482	char *gcf;
	483	struct hthead *req;
	484	int fd;
	485
	486	nodef = 0;
	487	while((c = getopt(argc, argv, "hN")) >= 0) {
	488	switch(c) {
	489	case 'h':
	490	usage(stdout);
	491	exit(0);
	492	case 'N':
	493	nodef = 1;
	494	break;
	495	default:
	496	usage(stderr);
	497	exit(1);
	498	}
	499	}
	500	if(argc - optind < 1) {
	501	usage(stderr);
	502	exit(1);
	503	}
	504	if(!nodef) {
	505	if((gcf = findstdconf("ashd/patplex.rc")) != NULL) {
	506	gconfig = readconfig(gcf);
	507	free(gcf);
	508	}
	509	}
	510	if((lconfig = readconfig(argv[optind])) == NULL) {
	511	flog(LOG_ERR, "could not read `%s'", argv[optind]);
	512	exit(1);
	513	}
	514	signal(SIGCHLD, SIG_IGN);
	515	signal(SIGHUP, sighandler);
	516	while(1) {
	517	if(reload) {
	518	reloadconf(argv[optind]);
	519	reload = 0;
	520	}
	521	if((fd = recvreq(0, &req)) < 0) {
	522	if(errno == EINTR)
	523	continue;
	524	if(errno != 0)
	525	flog(LOG_ERR, "recvreq: %s", strerror(errno));
	526	break;
	527	}
	528	serve(req, fd);
	529	freehthead(req);
	530	close(fd);
	531	}
	532	return(0);
	533	}