[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>
#include <sys/wait.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, NULL, NULL))
	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 chldhandler(int sig)
{
    pid_t pid;
    
    do {
	pid = waitpid(-1, NULL, WNOHANG);
    } while(pid > 0);
}

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, chldhandler);
    signal(SIGHUP, sighandler);
    signal(SIGPIPE, 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
326e08fc 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 <string.h>
	22	#include <unistd.h>
	23	#include <signal.h>
	24	#include <errno.h>
	25	#include <ctype.h>
	26	#include <regex.h>
578ad6b1	27	#include <sys/wait.h>
326e08fc FT	28
	29	#ifdef HAVE_CONFIG_H
	30	#include <config.h>
	31	#endif
	32	#include <utils.h>
	33	#include <log.h>
	34	#include <req.h>
	35	#include <proc.h>
	36	#include <resp.h>
06c1a718	37	#include <cf.h>
326e08fc FT	38
	39	#define PAT_REST 0
	40	#define PAT_URL 1
	41	#define PAT_METHOD 2
	42	#define PAT_HEADER 3
	43	#define PAT_ALL 4
	44	#define PAT_DEFAULT 5
	45
	46	#define PATFL_MSS 1
	47
	48	struct config {
	49	struct child *children;
	50	struct pattern *patterns;
	51	};
	52
326e08fc FT	53	struct rule {
	54	int type;
	55	int fl;
	56	char *header;
	57	regex_t *pattern;
	58	};
	59
	60	struct pattern {
	61	struct pattern *next;
	62	char *childnm;
	63	struct rule **rules;
	64	char *restpat;
	65	};
	66
0fc6fd13	67	static struct config gconfig, lconfig;
3a42b6b1	68	static volatile int reload = 0;
326e08fc FT	69
	70	static void freepattern(struct pattern *pat)
	71	{
	72	struct rule **rule;
	73
	74	for(rule = pat->rules; *rule; rule++) {
	75	if((*rule)->header != NULL)
	76	free((*rule)->header);
	77	if((*rule)->pattern != NULL) {
	78	regfree((*rule)->pattern);
	79	free((*rule)->pattern);
	80	}
	81	free(*rule);
	82	}
	83	if(pat->childnm != NULL)
	84	free(pat->childnm);
	85	free(pat);
	86	}
	87
3a42b6b1 FT	88	static void freeconfig(struct config *cf)
	89	{
	90	struct child ch, nch;
	91	struct pattern pat, npat;
	92
	93	for(ch = cf->children; ch != NULL; ch = nch) {
	94	nch = ch->next;
	95	freechild(ch);
	96	}
	97	for(pat = cf->patterns; pat != NULL; pat = npat) {
	98	npat = pat->next;
	99	freepattern(pat);
	100	}
	101	free(cf);
	102	}
	103
326e08fc FT	104	static struct child getchild(struct config cf, char *name)
	105	{
	106	struct child *ch;
	107
	108	for(ch = cf->children; ch; ch = ch->next) {
	109	if(!strcmp(ch->name, name))
	110	break;
	111	}
	112	return(ch);
	113	}
	114
	115	static struct rule newrule(struct pattern pat)
	116	{
	117	int i;
	118	struct rule *rule;
	119
	120	for(i = 0; pat->rules[i]; i++);
	121	pat->rules = srealloc(pat->rules, sizeof(pat->rules) (i + 2));
	122	rule = pat->rules[i] = szmalloc(sizeof(*rule));
	123	pat->rules[i + 1] = NULL;
	124	return(rule);
	125	}
	126
	127	static struct pattern *newpattern(void)
	128	{
	129	struct pattern *pat;
	130
	131	omalloc(pat);
	132	pat->rules = szmalloc(sizeof(*pat->rules));
	133	return(pat);
	134	}
	135
	136	static regex_t regalloc(char regex, int flags)
	137	{
	138	regex_t *ret;
	139	int res;
	140	char errbuf[256];
	141
	142	omalloc(ret);
	143	if((res = regcomp(ret, regex, flags \| REG_EXTENDED)) != 0) {
	144	regerror(res, ret, errbuf, sizeof(errbuf));
	145	flog(LOG_WARNING, "%s: %s", regex, errbuf);
	146	free(ret);
	147	return(NULL);
	148	}
	149	return(ret);
	150	}
	151
06c1a718	152	static struct pattern parsepattern(struct cfstate s)
326e08fc	153	{
326e08fc	154	struct pattern *pat;
06c1a718	155	int sl;
326e08fc FT	156	struct rule *rule;
	157	regex_t *regex;
	158	int rxfl;
	159
06c1a718 FT	160	if(!strcmp(s->argv[0], "match")) {
	161	s->expstart = 1;
	162	pat = newpattern();
	163	} else {
326e08fc	164	return(NULL);
06c1a718 FT	165	}
	166
	167	sl = s->lno;
	168	while(1) {
	169	getcfline(s);
	170	if(!strcmp(s->argv[0], "point") \|\|
	171	!strcmp(s->argv[0], "url") \|\|
	172	!strcmp(s->argv[0], "method")) {
	173	if(s->argc < 2) {
	174	flog(LOG_WARNING, "%s:%i: missing pattern for `%s' match", s->file, s->lno, s->argv[0]);
326e08fc	175	continue;
326e08fc	176	}
06c1a718 FT	177	if(s->argc >= 3) {
	178	if(strchr(s->argv[2], 'i'))
	179	rxfl \|= REG_ICASE;
326e08fc	180	}
06c1a718 FT	181	if((regex = regalloc(s->argv[1], rxfl)) == NULL) {
	182	flog(LOG_WARNING, "%s:%i: invalid regex for `%s' match", s->file, s->lno, s->argv[0]);
	183	continue;
	184	}
	185	rule = newrule(pat);
	186	if(!strcmp(s->argv[0], "point"))
	187	rule->type = PAT_REST;
	188	else if(!strcmp(s->argv[0], "url"))
	189	rule->type = PAT_URL;
	190	else if(!strcmp(s->argv[0], "method"))
	191	rule->type = PAT_METHOD;
	192	rule->pattern = regex;
	193	if(s->argc >= 3) {
	194	if(strchr(s->argv[2], 's'))
	195	rule->fl \|= PATFL_MSS;
	196	}
	197	} else if(!strcmp(s->argv[0], "header")) {
	198	if(s->argc < 3) {
	199	flog(LOG_WARNING, "%s:%i: missing header name or pattern for `header' match", s->file, s->lno);
	200	continue;
	201	}
	202	if(s->argc >= 4) {
	203	if(strchr(s->argv[3], 'i'))
	204	rxfl \|= REG_ICASE;
	205	}
	206	if((regex = regalloc(s->argv[2], rxfl)) == NULL) {
	207	flog(LOG_WARNING, "%s:%i: invalid regex for `header' match", s->file, s->lno);
	208	continue;
	209	}
	210	rule = newrule(pat);
	211	rule->type = PAT_HEADER;
	212	rule->header = sstrdup(s->argv[1]);
	213	rule->pattern = regex;
	214	if(s->argc >= 4) {
	215	if(strchr(s->argv[3], 's'))
	216	rule->fl \|= PATFL_MSS;
326e08fc	217	}
06c1a718 FT	218	} else if(!strcmp(s->argv[0], "all")) {
	219	newrule(pat)->type = PAT_ALL;
	220	} else if(!strcmp(s->argv[0], "default")) {
	221	newrule(pat)->type = PAT_DEFAULT;
	222	} else if(!strcmp(s->argv[0], "handler")) {
	223	if(s->argc < 2) {
	224	flog(LOG_WARNING, "%s:%i: missing child name for `handler' directive", s->file, s->lno);
	225	continue;
	226	}
	227	if(pat->childnm != NULL)
	228	free(pat->childnm);
	229	pat->childnm = sstrdup(s->argv[1]);
	230	} else if(!strcmp(s->argv[0], "restpat")) {
	231	if(s->argc < 2) {
	232	flog(LOG_WARNING, "%s:%i: missing pattern for `restpat' directive", s->file, s->lno);
	233	continue;
	234	}
	235	if(pat->restpat != NULL)
	236	free(pat->restpat);
	237	pat->restpat = sstrdup(s->argv[1]);
	238	} else if(!strcmp(s->argv[0], "end") \|\| !strcmp(s->argv[0], "eof")) {
	239	break;
	240	} else {
	241	flog(LOG_WARNING, "%s:%i: unknown directive `%s' in pattern declaration", s->file, s->lno, s->argv[0]);
326e08fc	242	}
06c1a718 FT	243	}
	244
	245	if(pat->rules[0] == NULL) {
	246	flog(LOG_WARNING, "%s:%i: missing rules in match declaration", s->file, sl);
	247	freepattern(pat);
	248	return(NULL);
	249	}
	250	if(pat->childnm == NULL) {
	251	flog(LOG_WARNING, "%s:%i: missing handler in match declaration", s->file, sl);
	252	freepattern(pat);
	253	return(NULL);
	254	}
	255	return(pat);
	256	}
	257
	258	static struct config readconfig(char filename)
	259	{
	260	struct cfstate *s;
	261	struct config *cf;
	262	struct child *ch;
	263	struct pattern *pat;
	264	FILE *in;
326e08fc	265
06c1a718 FT	266	if((in = fopen(filename, "r")) == NULL) {
	267	flog(LOG_WARNING, "%s: %s", filename, strerror(errno));
	268	return(NULL);
	269	}
	270	s = mkcfparser(in, filename);
	271	omalloc(cf);
	272
	273	while(1) {
	274	getcfline(s);
	275	if((ch = parsechild(s)) != NULL) {
	276	ch->next = cf->children;
	277	cf->children = ch;
	278	} else if((pat = parsepattern(s)) != NULL) {
	279	pat->next = cf->patterns;
	280	cf->patterns = pat;
	281	} else if(!strcmp(s->argv[0], "eof")) {
	282	break;
	283	} else {
	284	flog(LOG_WARNING, "%s:%i: unknown directive `%s'", s->file, s->lno, s->argv[0]);
	285	}
	286	}
	287
	288	freecfparser(s);
	289	fclose(in);
326e08fc FT	290	return(cf);
	291	}
	292
	293	static void exprestpat(struct hthead req, struct pattern pat, char **mstr)
	294	{
	295	char p, p2, *hdr;
	296	int mc;
	297	struct charbuf buf;
	298
	299	if(mstr == NULL)
	300	mc = 0;
	301	else
	302	for(mc = 0; mstr[mc]; mc++);
	303	bufinit(buf);
	304	for(p = pat->restpat; *p; ) {
	305	if(*p == '$') {
	306	p++;
	307	if((p >= '0') && (p <= '9')) {
	308	if(*p - '0' < mc)
	309	bufcatstr(buf, mstr[*p - '0']);
	310	p++;
	311	} else if(*p == '_') {
	312	bufcatstr(buf, req->rest);
	313	p++;
	314	} else if(*p == '$') {
	315	bufadd(buf, '$');
	316	p++;
	317	} else if(*p == '{') {
06c1a718	318	if((p2 = strchr(p, '}')) == NULL) {
326e08fc FT	319	p++;
326e08fc FT	320	} else {
06c1a718	321	hdr = getheader(req, sprintf3("%.*s", p2 - p - 1, p + 1));
326e08fc FT	322	if(hdr)
	323	bufcatstr(buf, hdr);
	324	}
	325	} else if(!*p) {
	326	}
	327	} else {
	328	bufadd(buf, *(p++));
	329	}
	330	}
	331	bufadd(buf, 0);
	332	replrest(req, buf.b);
	333	buffree(buf);
	334	}
	335
	336	static char findmatch(struct config cf, struct hthead *req, int trydefault)
	337	{
	338	int i, o;
	339	struct pattern *pat;
	340	struct rule *rule;
	341	int rmo, matched;
	342	char *pstr;
	343	char **mstr;
	344	regmatch_t gr[10];
	345
	346	mstr = NULL;
	347	for(pat = cf->patterns; pat != NULL; pat = pat->next) {
	348	rmo = -1;
	349	for(i = 0; (rule = pat->rules[i]) != NULL; i++) {
	350	matched = 0;
	351	if(rule->type == PAT_REST) {
	352	if((matched = !regexec(rule->pattern, pstr = req->rest, 10, gr, 0)))
	353	rmo = gr[0].rm_eo;
	354	else
	355	break;
	356	} else if(rule->type == PAT_URL) {
	357	if(!(matched = !regexec(rule->pattern, pstr = req->url, 10, gr, 0)))
	358	break;
	359	} else if(rule->type == PAT_METHOD) {
	360	if(!(matched = !regexec(rule->pattern, pstr = req->method, 10, gr, 0)))
	361	break;
	362	} else if(rule->type == PAT_HEADER) {
	363	if(!(pstr = getheader(req, rule->header)))
	364	break;
	365	if(!(matched = !regexec(rule->pattern, pstr, 10, gr, 0)))
	366	break;
	367	} else if(rule->type == PAT_ALL) {
	368	} else if(rule->type == PAT_DEFAULT) {
	369	if(!trydefault)
	370	break;
	371	}
	372	if(matched && (rule->fl & PATFL_MSS)) {
	373	if(mstr) {
	374	flog(LOG_WARNING, "two pattern rules marked with `s' flag found (for handler %s)", pat->childnm);
	375	freeca(mstr);
	376	}
	377	for(o = 0; o < 10; o++) {
	378	if(gr[o].rm_so < 0)
	379	break;
	380	}
	381	mstr = szmalloc((o + 1) * sizeof(*mstr));
	382	for(o = 0; o < 10; o++) {
	383	if(gr[o].rm_so < 0)
	384	break;
	385	mstr[o] = smalloc(gr[o].rm_eo - gr[o].rm_so + 1);
386	memcpy(mstr[o], pstr + gr[o].rm_so, gr[o].rm_eo - gr[o].rm_so);
387	mstr[o][gr[o].rm_eo - gr[o].rm_so] = 0;
388	}
389	}
390	}
391	if(!rule) {
392	if(pat->restpat) {
393	exprestpat(req, pat, mstr);
394	} else if(rmo != -1) {
395	replrest(req, req->rest + rmo);
396	}
397	if(mstr)
398	freeca(mstr);
399	return(pat->childnm);
400	}
401	if(mstr) {
402	freeca(mstr);
403	mstr = NULL;
404	}
405	}
406	return(NULL);
407	}
408
326e08fc FT	409	static void serve(struct hthead *req, int fd)
	410	{
	411	char *chnm;
	412	struct child *ch;
	413
0fc6fd13 FT	414	chnm = NULL;
	415	if(chnm == NULL)
	416	chnm = findmatch(lconfig, req, 0);
	417	if(chnm == NULL)
	418	chnm = findmatch(lconfig, req, 1);
	419	if(gconfig != NULL) {
	420	if(chnm == NULL)
	421	chnm = findmatch(gconfig, req, 0);
	422	if(chnm == NULL)
	423	chnm = findmatch(gconfig, req, 1);
	424	}
	425	if(chnm == NULL) {
326e08fc FT	426	simpleerror(fd, 404, "Not Found", "The requested resource could not be found on this server.");
	427	return;
	428	}
0fc6fd13 FT	429	ch = NULL;
	430	if(ch == NULL)
	431	ch = getchild(lconfig, chnm);
	432	if(gconfig != NULL) {
	433	if(ch == NULL)
	434	ch = getchild(gconfig, chnm);
	435	}
	436	if(ch == NULL) {
326e08fc FT	437	flog(LOG_ERR, "child %s requested, but was not declared", chnm);
	438	simpleerror(fd, 500, "Configuration Error", "The server is erroneously configured. Handler %s was requested, but not declared.", chnm);
	439	return;
	440	}
	441
6a7a868e	442	if(childhandle(ch, req, fd, NULL, NULL))
06c1a718	443	simpleerror(fd, 500, "Server Error", "The request handler crashed.");
326e08fc FT	444	}
326e08fc FT	445
3a42b6b1 FT	446	static void reloadconf(char *nm)
	447	{
	448	struct config *cf;
	449	struct child ch1, ch2;
	450
	451	if((cf = readconfig(nm)) == NULL) {
	452	flog(LOG_WARNING, "could not reload configuration file `%s'", nm);
	453	return;
	454	}
	455	for(ch1 = cf->children; ch1 != NULL; ch1 = ch1->next) {
	456	for(ch2 = lconfig->children; ch2 != NULL; ch2 = ch2->next) {
	457	if(!strcmp(ch1->name, ch2->name)) {
	458	ch1->fd = ch2->fd;
	459	ch2->fd = -1;
	460	break;
	461	}
	462	}
	463	}
	464	freeconfig(lconfig);
	465	lconfig = cf;
	466	}
	467
578ad6b1 FT	468	static void chldhandler(int sig)
	469	{
	470	pid_t pid;
	471
	472	do {
	473	pid = waitpid(-1, NULL, WNOHANG);
	474	} while(pid > 0);
	475	}
	476
3a42b6b1 FT	477	static void sighandler(int sig)
	478	{
	479	if(sig == SIGHUP)
	480	reload = 1;
	481	}
	482
0fc6fd13 FT	483	static void usage(FILE *out)
	484	{
	485	fprintf(out, "usage: patplex [-hN] CONFIGFILE\n");
	486	}
	487
326e08fc FT	488	int main(int argc, char **argv)
326e08fc FT	489	{
0fc6fd13 FT	490	int c;
	491	int nodef;
	492	char *gcf;
326e08fc FT	493	struct hthead *req;
326e08fc FT	494	int fd;
0fc6fd13 FT	495
	496	nodef = 0;
	497	while((c = getopt(argc, argv, "hN")) >= 0) {
	498	switch(c) {
	499	case 'h':
	500	usage(stdout);
	501	exit(0);
	502	case 'N':
	503	nodef = 1;
	504	break;
	505	default:
	506	usage(stderr);
	507	exit(1);
	508	}
	509	}
	510	if(argc - optind < 1) {
	511	usage(stderr);
326e08fc FT	512	exit(1);
326e08fc FT	513	}
0fc6fd13 FT	514	if(!nodef) {
	515	if((gcf = findstdconf("ashd/patplex.rc")) != NULL) {
	516	gconfig = readconfig(gcf);
	517	free(gcf);
	518	}
	519	}
3a42b6b1 FT	520	if((lconfig = readconfig(argv[optind])) == NULL) {
	521	flog(LOG_ERR, "could not read `%s'", argv[optind]);
	522	exit(1);
	523	}
578ad6b1	524	signal(SIGCHLD, chldhandler);
3a42b6b1	525	signal(SIGHUP, sighandler);
fd735432	526	signal(SIGPIPE, sighandler);
326e08fc	527	while(1) {
3a42b6b1 FT	528	if(reload) {
	529	reloadconf(argv[optind]);
	530	reload = 0;
	531	}
326e08fc	532	if((fd = recvreq(0, &req)) < 0) {
6174a039 FT	533	if(errno == EINTR)
6174a039 FT	534	continue;
326e08fc FT	535	if(errno != 0)
	536	flog(LOG_ERR, "recvreq: %s", strerror(errno));
	537	break;
	538	}
	539	serve(req, fd);
	540	freehthead(req);
	541	close(fd);
	542	}
	543	return(0);
	544	}