[ashd.git] / lib / resp.c

/*
    ashd - A Sane HTTP Daemon
    Copyright (C) 2008  Fredrik Tolf <fredrik@dolda2000.com>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <time.h>
#include <regex.h>

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <utils.h>
#include <resp.h>

static char safechars[128] = {
 /* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xa xb xc xd xe xf */
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0,
    0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
    0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0,
};

char *urlquote(char *text)
{
    static char *ret = NULL;
    struct charbuf buf;
    unsigned char c;
    
    if(ret != NULL)
	free(ret);
    bufinit(buf);
    for(; *text; text++) {
	c = *text;
	if(!c < 128 && safechars[(int)c])
	    bufadd(buf, *text);
	else
	    bprintf(&buf, "%%%02X", (int)c);
    }
    bufadd(buf, 0);
    return(ret = buf.b);
}

char *htmlquote(char *text)
{
    static char *ret = NULL;
    struct charbuf buf;
    
    if(ret != NULL)
	free(ret);
    bufinit(buf);
    for(; *text; text++) {
	if(*text == '<')
	    bufcatstr(buf, "&lt;");
	else if(*text == '>')
	    bufcatstr(buf, "&gt;");
	else if(*text == '&')
	    bufcatstr(buf, "&amp;");
	else if(*text == '\"')
	    bufcatstr(buf, "&quot;");
	else
	    bufadd(buf, *text);
    }
    bufadd(buf, 0);
    return(ret = buf.b);
}

void simpleerror(int fd, int code, char *msg, char *fmt, ...)
{
    struct charbuf buf;
    char *tmp;
    va_list args;
    FILE *out;
    
    va_start(args, fmt);
    tmp = vsprintf2(fmt, args);
    va_end(args);
    bufinit(buf);
    bufcatstr(buf, "<?xml version=\"1.0\" encoding=\"US-ASCII\"?>\r\n");
    bufcatstr(buf, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\r\n");
    bufcatstr(buf, "<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"en-US\" xml:lang=\"en-US\">\r\n");
    bufcatstr(buf, "<head>\r\n");
    bprintf(&buf, "<title>%s</title>\r\n", msg);
    bufcatstr(buf, "</head>\r\n");
    bufcatstr(buf, "<body>\r\n");
    bprintf(&buf, "<h1>%s</h1>\r\n", msg);
    bprintf(&buf, "<p>%s</p>\r\n", htmlquote(tmp));
    bufcatstr(buf, "</body>\r\n");
    bufcatstr(buf, "</html>\r\n");
    out = fdopen(dup(fd), "w");
    fprintf(out, "HTTP/1.1 %i %s\n", code, msg);
    fprintf(out, "Content-Type: text/html\n");
    fprintf(out, "Content-Length: %zi\n", buf.d);
    fprintf(out, "\n");
    fwrite(buf.b, 1, buf.d, out);
    fclose(out);
    buffree(buf);
}

void stdredir(struct hthead *req, int fd, int code, char *dst)
{
    FILE *out;
    char *sp, *cp, *ep, *qs, *path, *url, *adst, *proto, *host;
    
    sp = strchr(dst, '/');
    cp = strchr(dst, ':');
    if(cp && (!sp || (cp < sp))) {
	adst = sstrdup(dst);
    } else {
	proto = getheader(req, "X-Ash-Protocol");
	host = getheader(req, "Host");
	if((proto == NULL) || (host == NULL)) {
	    /* Not compliant, but there isn't a whole lot to be done
	     * about it. */
	    adst = sstrdup(dst);
	} else {
	    if(*dst == '/') {
		path = sstrdup(dst + 1);
	    } else {
		if((*(url = req->url)) == '/')
		    url++;
		if((ep = strchr(url, '?')) == NULL) {
		    ep = url + strlen(url);
		    qs = "";
		} else {
		    qs = ep;
		}
		for(; (ep > url) && (ep[-1] != '/'); ep--);
		path = sprintf2("%.*s%s%s", ep - url, url, dst, qs);
	    }
	    adst = sprintf2("%s://%s/%s", proto, host, path);
	    free(path);
	}
    }
    out = fdopen(dup(fd), "w");
    fprintf(out, "HTTP/1.1 %i Redirection\n", code);
    fprintf(out, "Content-Length: 0\n");
    fprintf(out, "Location: %s\n", adst);
    fprintf(out, "\n");
    fclose(out);
    free(adst);
}

char *fmthttpdate(time_t time)
{
    /* I avoid using strftime, since it depends on locale settings. */
    static char *days[] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
    static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
			     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
    struct tm *tm;
    
    tm = gmtime(&time);
    return(sprintf3("%s, %i %s %i %02i:%02i:%02i GMT", days[(tm->tm_wday + 6) % 7], tm->tm_mday, months[tm->tm_mon], tm->tm_year + 1900, tm->tm_hour, tm->tm_min, tm->tm_sec));
}

time_t parsehttpdate(char *date)
{
    static regex_t *spec = NULL;
    static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
			     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
    int i;
    regmatch_t g[11];
    struct tm tm;
    int tz;
    
    int gtoi(regmatch_t g)
    {
	int i, n;

	for(i = g.rm_so, n = 0; i < g.rm_eo; i++)
	    n = (n * 10) + (date[i] - '0');
	return(n);
    }
    
    int gstrcmp(regmatch_t g, char *str) {
	if(g.rm_eo - g.rm_so != strlen(str))
	    return(1);
	return(strncasecmp(date + g.rm_so, str, g.rm_eo - g.rm_so));
    }

    if(spec == NULL) {
	omalloc(spec);
	if(regcomp(spec, "^[A-Z]{3}, +([0-9]+) +([A-Z]{3}) +([0-9]+) +([0-9]{2}):([0-9]{2}):([0-9]{2}) +(([A-Z]+)|[+-]([0-9]{2})([0-9]{2}))$", REG_EXTENDED | REG_ICASE)) {
	    free(spec);
	    spec = NULL;
	    return(0);
	}
    }
    if(regexec(spec, date, 11, g, 0))
	return(0);
    tm.tm_mday = gtoi(g[1]);
    tm.tm_year = gtoi(g[3]) - 1900;
    tm.tm_hour = gtoi(g[4]);
    tm.tm_min = gtoi(g[5]);
    tm.tm_sec = gtoi(g[6]);
    
    tm.tm_mon = -1;
    for(i = 0; i < 12; i++) {
	if(!gstrcmp(g[2], months[i])) {
	    tm.tm_mon = i;
	    break;
	}
    }
    if(tm.tm_mon < 0)
	return(0);
    
    if(g[8].rm_so > 0) {
	if(!gstrcmp(g[8], "GMT"))
	    tz = 0;
	else
	    return(0);
    } else if((g[9].rm_so > 0) && (g[10].rm_so > 0)) {
	tz = gtoi(g[9]) * 3600 + gtoi(g[10]) * 60;
	if(date[g[7].rm_so] == '-')
	    tz = -tz;
    } else {
	return(0);
    }
    
    return(timegm(&tm) - tz);
}
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 <unistd.h>
	21	#include <string.h>
	22	#include <stdio.h>
	23	#include <stdarg.h>
	24	#include <time.h>
	25	#include <regex.h>
	26
	27	#ifdef HAVE_CONFIG_H
	28	#include <config.h>
	29	#endif
	30	#include <utils.h>
	31	#include <resp.h>
	32
	33	static char safechars[128] = {
	34	/* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xa xb xc xd xe xf */
	35	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	36	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	37	0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1,
	38	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0,
	39	0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	40	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
	41	0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	42	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0,
	43	};
	44
	45	char urlquote(char text)
	46	{
	47	static char *ret = NULL;
	48	struct charbuf buf;
	49	unsigned char c;
	50
	51	if(ret != NULL)
	52	free(ret);
	53	bufinit(buf);
	54	for(; *text; text++) {
	55	c = *text;
	56	if(!c < 128 && safechars[(int)c])
	57	bufadd(buf, *text);
	58	else
	59	bprintf(&buf, "%%%02X", (int)c);
	60	}
	61	bufadd(buf, 0);
	62	return(ret = buf.b);
	63	}
	64
	65	char htmlquote(char text)
	66	{
	67	static char *ret = NULL;
	68	struct charbuf buf;
	69
	70	if(ret != NULL)
	71	free(ret);
	72	bufinit(buf);
	73	for(; *text; text++) {
	74	if(*text == '<')
	75	bufcatstr(buf, "<");
	76	else if(*text == '>')
	77	bufcatstr(buf, ">");
	78	else if(*text == '&')
	79	bufcatstr(buf, "&");
	80	else if(*text == '\"')
	81	bufcatstr(buf, """);
	82	else
	83	bufadd(buf, *text);
	84	}
	85	bufadd(buf, 0);
	86	return(ret = buf.b);
	87	}
	88
	89	void simpleerror(int fd, int code, char msg, char fmt, ...)
	90	{
	91	struct charbuf buf;
	92	char *tmp;
	93	va_list args;
	94	FILE *out;
	95
	96	va_start(args, fmt);
	97	tmp = vsprintf2(fmt, args);
	98	va_end(args);
	99	bufinit(buf);
	100	bufcatstr(buf, "<?xml version=\"1.0\" encoding=\"US-ASCII\"?>\r\n");
	101	bufcatstr(buf, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\r\n");
	102	bufcatstr(buf, "<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"en-US\" xml:lang=\"en-US\">\r\n");
	103	bufcatstr(buf, "<head>\r\n");
	104	bprintf(&buf, "<title>%s</title>\r\n", msg);
	105	bufcatstr(buf, "</head>\r\n");
	106	bufcatstr(buf, "<body>\r\n");
	107	bprintf(&buf, "<h1>%s</h1>\r\n", msg);
	108	bprintf(&buf, "<p>%s</p>\r\n", htmlquote(tmp));
	109	bufcatstr(buf, "</body>\r\n");
	110	bufcatstr(buf, "</html>\r\n");
	111	out = fdopen(dup(fd), "w");
	112	fprintf(out, "HTTP/1.1 %i %s\n", code, msg);
	113	fprintf(out, "Content-Type: text/html\n");
	114	fprintf(out, "Content-Length: %zi\n", buf.d);
	115	fprintf(out, "\n");
	116	fwrite(buf.b, 1, buf.d, out);
	117	fclose(out);
	118	buffree(buf);
	119	}
	120
	121	void stdredir(struct hthead req, int fd, int code, char dst)
	122	{
	123	FILE *out;
	124	char sp, cp, ep, qs, path, url, adst, proto, *host;
	125
	126	sp = strchr(dst, '/');
	127	cp = strchr(dst, ':');
	128	if(cp && (!sp \|\| (cp < sp))) {
	129	adst = sstrdup(dst);
	130	} else {
	131	proto = getheader(req, "X-Ash-Protocol");
	132	host = getheader(req, "Host");
	133	if((proto == NULL) \|\| (host == NULL)) {
	134	/* Not compliant, but there isn't a whole lot to be done
	135	* about it. */
	136	adst = sstrdup(dst);
	137	} else {
	138	if(*dst == '/') {
	139	path = sstrdup(dst + 1);
	140	} else {
	141	if((*(url = req->url)) == '/')
	142	url++;
	143	if((ep = strchr(url, '?')) == NULL) {
	144	ep = url + strlen(url);
	145	qs = "";
	146	} else {
	147	qs = ep;
	148	}
	149	for(; (ep > url) && (ep[-1] != '/'); ep--);
	150	path = sprintf2("%.*s%s%s", ep - url, url, dst, qs);
	151	}
	152	adst = sprintf2("%s://%s/%s", proto, host, path);
	153	free(path);
	154	}
	155	}
	156	out = fdopen(dup(fd), "w");
	157	fprintf(out, "HTTP/1.1 %i Redirection\n", code);
	158	fprintf(out, "Content-Length: 0\n");
	159	fprintf(out, "Location: %s\n", adst);
	160	fprintf(out, "\n");
	161	fclose(out);
	162	free(adst);
	163	}
	164
	165	char *fmthttpdate(time_t time)
	166	{
	167	/* I avoid using strftime, since it depends on locale settings. */
	168	static char *days[] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
	169	static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
	170	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
	171	struct tm *tm;
	172
	173	tm = gmtime(&time);
	174	return(sprintf3("%s, %i %s %i %02i:%02i:%02i GMT", days[(tm->tm_wday + 6) % 7], tm->tm_mday, months[tm->tm_mon], tm->tm_year + 1900, tm->tm_hour, tm->tm_min, tm->tm_sec));
	175	}
	176
	177	time_t parsehttpdate(char *date)
	178	{
	179	static regex_t *spec = NULL;
	180	static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
	181	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
	182	int i;
	183	regmatch_t g[11];
	184	struct tm tm;
	185	int tz;
	186
	187	int gtoi(regmatch_t g)
	188	{
	189	int i, n;
	190
	191	for(i = g.rm_so, n = 0; i < g.rm_eo; i++)
	192	n = (n * 10) + (date[i] - '0');
	193	return(n);
	194	}
	195
	196	int gstrcmp(regmatch_t g, char *str) {
	197	if(g.rm_eo - g.rm_so != strlen(str))
	198	return(1);
	199	return(strncasecmp(date + g.rm_so, str, g.rm_eo - g.rm_so));
	200	}
	201
	202	if(spec == NULL) {
	203	omalloc(spec);
	204	if(regcomp(spec, "^[A-Z]{3}, +([0-9]+) +([A-Z]{3}) +([0-9]+) +([0-9]{2}):([0-9]{2}):([0-9]{2}) +(([A-Z]+)\|[+-]([0-9]{2})([0-9]{2}))$", REG_EXTENDED \| REG_ICASE)) {
	205	free(spec);
	206	spec = NULL;
	207	return(0);
	208	}
	209	}
	210	if(regexec(spec, date, 11, g, 0))
	211	return(0);
	212	tm.tm_mday = gtoi(g[1]);
	213	tm.tm_year = gtoi(g[3]) - 1900;
	214	tm.tm_hour = gtoi(g[4]);
	215	tm.tm_min = gtoi(g[5]);
	216	tm.tm_sec = gtoi(g[6]);
	217
	218	tm.tm_mon = -1;
	219	for(i = 0; i < 12; i++) {
	220	if(!gstrcmp(g[2], months[i])) {
	221	tm.tm_mon = i;
	222	break;
	223	}
	224	}
	225	if(tm.tm_mon < 0)
	226	return(0);
	227
	228	if(g[8].rm_so > 0) {
	229	if(!gstrcmp(g[8], "GMT"))
	230	tz = 0;
	231	else
	232	return(0);
	233	} else if((g[9].rm_so > 0) && (g[10].rm_so > 0)) {
	234	tz = gtoi(g[9]) * 3600 + gtoi(g[10]) * 60;
	235	if(date[g[7].rm_so] == '-')
	236	tz = -tz;
	237	} else {
	238	return(0);
	239	}
	240
	241	return(timegm(&tm) - tz);
	242	}