[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 <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>

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

void simpleerror(int fd, int code, char *msg, char *fmt, ...)
{
    struct charbuf buf;
    char *tmp1, *tmp2;
    va_list args;
    FILE *out;
    
    va_start(args, fmt);
    tmp1 = vsprintf2(fmt, args);
    va_end(args);
    tmp2 = htmlquote(tmp1);
    free(tmp1);
    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", tmp2);
    bufcatstr(buf, "</body>\r\n");
    bufcatstr(buf, "</html>\r\n");
    free(tmp2);
    out = fdopen(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, *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);
	    } else {
		if((*(url = req->url)) == '/')
		    url++;
		if((ep = strrchr(url, '/')) != NULL)
		    ep++;
		else
		    ep = url;
		path = sprintf2("%.*s%s", ep - url, url, dst);
	    }
	    adst = sprintf2("%s://%s/%s", proto, host, path);
	    free(path);
	}
    }
    out = fdopen(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
d422fdfd 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 <string.h>
	21	#include <stdio.h>
	22	#include <stdarg.h>
b4164ce6 FT	23	#include <time.h>
b4164ce6 FT	24	#include <regex.h>
d422fdfd FT	25
	26	#ifdef HAVE_CONFIG_H
	27	#include <config.h>
	28	#endif
	29	#include <utils.h>
	30	#include <resp.h>
	31
	32	char htmlquote(char text)
	33	{
	34	struct charbuf buf;
	35
	36	bufinit(buf);
	37	for(; *text; text++) {
	38	if(*text == '<')
	39	bufcatstr(buf, "<");
	40	else if(*text == '>')
	41	bufcatstr(buf, ">");
	42	else if(*text == '&')
	43	bufcatstr(buf, "&");
	44	else
	45	bufadd(buf, *text);
	46	}
	47	bufadd(buf, 0);
	48	return(buf.b);
	49	}
	50
	51	void simpleerror(int fd, int code, char msg, char fmt, ...)
	52	{
	53	struct charbuf buf;
	54	char tmp1, tmp2;
	55	va_list args;
	56	FILE *out;
	57
	58	va_start(args, fmt);
	59	tmp1 = vsprintf2(fmt, args);
	60	va_end(args);
	61	tmp2 = htmlquote(tmp1);
	62	free(tmp1);
	63	bufinit(buf);
	64	bufcatstr(buf, "<?xml version=\"1.0\" encoding=\"US-ASCII\"?>\r\n");
	65	bufcatstr(buf, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\r\n");
	66	bufcatstr(buf, "<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"en-US\" xml:lang=\"en-US\">\r\n");
	67	bufcatstr(buf, "<head>\r\n");
	68	bprintf(&buf, "<title>%s</title>\r\n", msg);
	69	bufcatstr(buf, "</head>\r\n");
	70	bufcatstr(buf, "<body>\r\n");
	71	bprintf(&buf, "<h1>%s</h1>\r\n", msg);
	72	bprintf(&buf, "<p>%s</p>\r\n", tmp2);
	73	bufcatstr(buf, "</body>\r\n");
	74	bufcatstr(buf, "</html>\r\n");
	75	free(tmp2);
	76	out = fdopen(fd, "w");
81cfca6c FT	77	fprintf(out, "HTTP/1.1 %i %s\n", code, msg);
	78	fprintf(out, "Content-Type: text/html\n");
	79	fprintf(out, "Content-Length: %zi\n", buf.d);
	80	fprintf(out, "\n");
d422fdfd FT	81	fwrite(buf.b, 1, buf.d, out);
	82	fclose(out);
	83	buffree(buf);
	84	}
b4164ce6	85
46e66302 FT	86	void stdredir(struct hthead req, int fd, int code, char dst)
	87	{
	88	FILE *out;
	89	char sp, cp, ep, path, url, adst, proto, host;
	90
	91	sp = strchr(dst, '/');
	92	cp = strchr(dst, ':');
	93	if(cp && (!sp \|\| (cp < sp))) {
	94	adst = sstrdup(dst);
	95	} else {
	96	proto = getheader(req, "X-Ash-Protocol");
	97	host = getheader(req, "Host");
	98	if((proto == NULL) \|\| (host == NULL)) {
	99	/* Not compliant, but there isn't a whole lot to be done
	100	* about it. */
	101	adst = sstrdup(dst);
	102	} else {
	103	if(*dst == '/') {
	104	path = sstrdup(dst);
	105	} else {
	106	if((*(url = req->url)) == '/')
	107	url++;
	108	if((ep = strrchr(url, '/')) != NULL)
	109	ep++;
	110	else
	111	ep = url;
	112	path = sprintf2("%.*s%s", ep - url, url, dst);
	113	}
	114	adst = sprintf2("%s://%s/%s", proto, host, path);
	115	free(path);
	116	}
	117	}
	118	out = fdopen(fd, "w");
	119	fprintf(out, "HTTP/1.1 %i Redirection\n", code);
	120	fprintf(out, "Content-Length: 0\n");
	121	fprintf(out, "Location: %s\n", adst);
	122	fprintf(out, "\n");
	123	fclose(out);
	124	free(adst);
	125	}
	126
b4164ce6 FT	127	char *fmthttpdate(time_t time)
	128	{
	129	/* I avoid using strftime, since it depends on locale settings. */
	130	static char *days[] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
	131	static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
	132	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
	133	struct tm *tm;
	134
	135	tm = gmtime(&time);
	136	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));
	137	}
	138
	139	time_t parsehttpdate(char *date)
	140	{
	141	static regex_t *spec = NULL;
	142	static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
	143	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
	144	int i;
	145	regmatch_t g[11];
	146	struct tm tm;
	147	int tz;
	148
	149	int gtoi(regmatch_t g)
	150	{
	151	int i, n;
	152
	153	for(i = g.rm_so, n = 0; i < g.rm_eo; i++)
	154	n = (n * 10) + (date[i] - '0');
	155	return(n);
	156	}
	157
	158	int gstrcmp(regmatch_t g, char *str) {
	159	if(g.rm_eo - g.rm_so != strlen(str))
	160	return(1);
	161	return(strncasecmp(date + g.rm_so, str, g.rm_eo - g.rm_so));
	162	}
	163
	164	if(spec == NULL) {
	165	omalloc(spec);
	166	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)) {
	167	free(spec);
	168	spec = NULL;
	169	return(0);
	170	}
	171	}
	172	if(regexec(spec, date, 11, g, 0))
	173	return(0);
	174	tm.tm_mday = gtoi(g[1]);
	175	tm.tm_year = gtoi(g[3]) - 1900;
	176	tm.tm_hour = gtoi(g[4]);
	177	tm.tm_min = gtoi(g[5]);
	178	tm.tm_sec = gtoi(g[6]);
	179
	180	tm.tm_mon = -1;
	181	for(i = 0; i < 12; i++) {
	182	if(!gstrcmp(g[2], months[i])) {
	183	tm.tm_mon = i;
	184	break;
	185	}
	186	}
	187	if(tm.tm_mon < 0)
	188	return(0);
	189
	190	if(g[8].rm_so > 0) {
191	if(!gstrcmp(g[8], "GMT"))
192	tz = 0;
193	else
194	return(0);
195	} else if((g[9].rm_so > 0) && (g[10].rm_so > 0)) {
196	tz = gtoi(g[9]) * 3600 + gtoi(g[10]) * 60;
197	if(date[g[7].rm_so] == '-')
198	tz = -tz;
199	} else {
200	return(0);
201	}
202
203	return(timegm(&tm) - tz);
204	}