[ashd.git] / src / sendfile.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 <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>
#include <stdint.h>
#include <time.h>
#include <magic.h>
#include <locale.h>
#include <langinfo.h>

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

#ifdef HAVE_XATTR
#include <attr/xattr.h>
#endif

static magic_t cookie = NULL;

static void passdata(int in, int out, off_t maxlen)
{
    int ret, len, off;
    char *buf;
    
    buf = smalloc(65536);
    while(1) {
	len = 65536;
	if((maxlen > 0) && (len > maxlen))
	    len = maxlen;
	len = read(in, buf, len);
	if(len < 0) {
	    flog(LOG_ERR, "sendfile: could not read input: %s", strerror(errno));
	    break;
	}
	if(len == 0)
	    break;
	for(off = 0; off < len; off += ret) {
	    ret = write(out, buf + off, len - off);
	    if(ret < 0) {
		flog(LOG_ERR, "sendfile: could not write output: %s", strerror(errno));
		break;
	    }
	}
	if(maxlen > 0) {
	    if((maxlen -= len) <= 0)
		break;
	}
    }
    free(buf);
}

static char *attrmimetype(char *file)
{
#ifdef HAVE_XATTR
    static char buf[1024];
    int i;
    ssize_t sz;
    
    if((sz = getxattr(file, "user.ash-mime-type", buf, sizeof(buf) - 1)) > 0)
	goto found;
    if((sz = getxattr(file, "user.mime-type", buf, sizeof(buf) - 1)) > 0)
	goto found;
    if((sz = getxattr(file, "user.mime_type", buf, sizeof(buf) - 1)) > 0)
	goto found;
    if((sz = getxattr(file, "user.Content-Type", buf, sizeof(buf) - 1)) > 0)
	goto found;
    return(NULL);
found:
    for(i = 0; i < sz; i++) {
	if((buf[i] < 32) || (buf[i] >= 128))
	    return(NULL);
    }
    buf[sz] = 0;
    return(buf);
#else
    return(NULL);
#endif
}

static const char *getmimetype(char *file, struct stat *sb)
{
    const char *ret;
    
    if((ret = attrmimetype(file)) != NULL)
	return(ret);
    if(cookie == NULL) {
	cookie = magic_open(MAGIC_MIME_TYPE | MAGIC_SYMLINK);
	magic_load(cookie, NULL);
    }
    if((ret = magic_file(cookie, file)) != NULL)
	return(ret);
    return("application/octet-stream");
}

/* XXX: This could be made far better and check for other attributes
 * and stuff, but not now. */
static const char *ckctype(const char *ctype)
{
    if(!strncmp(ctype, "text/", 5) && (strchr(ctype, ';') == NULL))
	return(sprintf2("%s; charset=%s", ctype, nl_langinfo(CODESET)));
    return(ctype);
}

static void checkcache(char *file, struct stat *sb)
{
    char *hdr;
    
    if((hdr = getenv("REQ_IF_MODIFIED_SINCE")) != NULL) {
	if(parsehttpdate(hdr) < sb->st_mtime)
	    return;
	printf("HTTP/1.1 304 Not Modified\n");
	printf("Date: %s\n", fmthttpdate(time(NULL)));
	printf("Content-Length: 0\n");
	printf("\n");
	exit(0);
    }
}

static void sendwhole(int fd, struct stat *sb, const char *contype, int head)
{
    printf("HTTP/1.1 200 OK\n");
    printf("Content-Type: %s\n", contype);
    printf("Content-Length: %ji\n", (intmax_t)sb->st_size);
    printf("Last-Modified: %s\n", fmthttpdate(sb->st_mtime));
    printf("Date: %s\n", fmthttpdate(time(NULL)));
    printf("\n");
    fflush(stdout);
    if(!head)
	passdata(fd, 1, -1);
}

static void sendrange(int fd, struct stat *sb, const char *contype, char *spec, int head)
{
    char buf[strlen(spec) + 1];
    char *p, *e;
    off_t start, end;
    
    if(strncmp(spec, "bytes=", 6))
	goto error;
    strcpy(buf, spec + 6);
    if((p = strchr(buf, '-')) == NULL)
	goto error;
    if(p == buf) {
	if(!p[1])
	    goto error;
	end = sb->st_size;
	start = end - strtoll(p + 1, &e, 10);
	if(*e)
	    goto error;
	if(start < 0)
	    start = 0;
    } else {
	*(p++) = 0;
	start = strtoll(buf, &e, 10);
	if(*e)
	    goto error;
	if(*p) {
	    end = strtoll(p, &e, 10) + 1;
	    if(*e)
		goto error;
	} else {
	    end = sb->st_size;
	}
    }
    if(start >= sb->st_size) {
	printf("HTTP/1.1 416 Not satisfiable\n");
	printf("Content-Range: */%ji\n", (intmax_t)sb->st_size);
	printf("Content-Length: 0\n");
	printf("Last-Modified: %s\n", fmthttpdate(sb->st_mtime));
	printf("Date: %s\n", fmthttpdate(time(NULL)));
	printf("\n");
	return;
    }
    if((start < 0) || (start >= end))
	goto error;
    if(end > sb->st_size)
	end = sb->st_size;
    errno = 0;
    if(lseek(fd, start, SEEK_SET) != start) {
	simpleerror(1, 500, "Internal Error", "Could not seek properly to beginning of requested byte range.");
	flog(LOG_ERR, "sendfile: could not seek properly when serving partial content: %s", strerror(errno));
	exit(1);
    }
    printf("HTTP/1.1 206 Partial content\n");
    printf("Content-Range: bytes %ji-%ji/%ji\n", (intmax_t)start, (intmax_t)(end - 1), (intmax_t)sb->st_size);
    printf("Content-Length: %ji\n", (intmax_t)(end - start));
    printf("Content-Type: %s\n", contype);
    printf("Last-Modified: %s\n", fmthttpdate(sb->st_mtime));
    printf("Date: %s\n", fmthttpdate(time(NULL)));
    printf("\n");
    fflush(stdout);
    if(!head)
	passdata(fd, 1, end - start);
    return;
    
error:
    sendwhole(fd, sb, contype, head);
}

static void usage(void)
{
    flog(LOG_ERR, "usage: sendfile [-c CONTENT-TYPE] [-f FILE] METHOD URL REST");
}

int main(int argc, char **argv)
{
    int c;
    char *file, *hdr;
    struct stat sb;
    int fd, ishead, ignrest;
    const char *contype;
    
    setlocale(LC_ALL, "");
    contype = NULL;
    file = NULL;
    ignrest = 0;
    while((c = getopt(argc, argv, "c:f:")) >= 0) {
	switch(c) {
	case 'c':
	    contype = optarg;
	    break;
	case 'f':
	    file = optarg;
	    ignrest = 1;
	    break;
	default:
	    usage();
	    exit(1);
	    break;
	}
    }
    if(argc - optind < 3) {
	usage();
	exit(1);
    }
    if((file == NULL) && ((file = getenv("REQ_X_ASH_FILE")) == NULL)) {
	flog(LOG_ERR, "sendfile: needs to be called with either the X-Ash-File header or the -f option");
	exit(1);
    }
    if(!ignrest && *argv[optind + 2]) {
	simpleerror(1, 404, "Not Found", "The requested URL has no corresponding resource.");
	exit(0);
    }
    if(stat(file, &sb) || ((fd = open(file, O_RDONLY)) < 0)) {
	flog(LOG_ERR, "sendfile: could not stat input file %s: %s", file, strerror(errno));
	simpleerror(1, 500, "Internal Error", "The server could not access its own data.");
	exit(1);
    }
    if(!strcasecmp(argv[optind], "get")) {
	ishead = 0;
    } else if(!strcasecmp(argv[optind], "head")) {
	ishead = 1;
    } else {
	simpleerror(1, 405, "Method not allowed", "The requested method is not defined for this resource.");
	return(0);
    }
    if(contype == NULL) {
	if((hdr = getenv("REQ_X_ASH_CONTENT_TYPE")) != NULL)
	    contype = hdr;
	else
	    contype = getmimetype(file, &sb);
    }
    contype = ckctype(contype);
    
    checkcache(file, &sb);
    
    if((hdr = getenv("REQ_RANGE")) != NULL)
	sendrange(fd, &sb, contype, hdr, ishead);
    else
	sendwhole(fd, &sb, contype, ishead);
    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 <string.h>
	21	#include <stdio.h>
	22	#include <unistd.h>
	23	#include <fcntl.h>
	24	#include <errno.h>
	25	#include <sys/stat.h>
	26	#include <stdint.h>
	27	#include <time.h>
	28	#include <magic.h>
	29	#include <locale.h>
	30	#include <langinfo.h>
	31
	32	#ifdef HAVE_CONFIG_H
	33	#include <config.h>
	34	#endif
	35	#include <utils.h>
	36	#include <log.h>
	37	#include <resp.h>
	38
	39	#ifdef HAVE_XATTR
	40	#include <attr/xattr.h>
	41	#endif
	42
	43	static magic_t cookie = NULL;
	44
	45	static void passdata(int in, int out, off_t maxlen)
	46	{
	47	int ret, len, off;
	48	char *buf;
	49
	50	buf = smalloc(65536);
	51	while(1) {
	52	len = 65536;
	53	if((maxlen > 0) && (len > maxlen))
	54	len = maxlen;
	55	len = read(in, buf, len);
	56	if(len < 0) {
	57	flog(LOG_ERR, "sendfile: could not read input: %s", strerror(errno));
	58	break;
	59	}
	60	if(len == 0)
	61	break;
	62	for(off = 0; off < len; off += ret) {
	63	ret = write(out, buf + off, len - off);
	64	if(ret < 0) {
	65	flog(LOG_ERR, "sendfile: could not write output: %s", strerror(errno));
	66	break;
	67	}
	68	}
	69	if(maxlen > 0) {
	70	if((maxlen -= len) <= 0)
	71	break;
	72	}
	73	}
	74	free(buf);
	75	}
	76
	77	static char attrmimetype(char file)
	78	{
	79	#ifdef HAVE_XATTR
	80	static char buf[1024];
	81	int i;
	82	ssize_t sz;
	83
	84	if((sz = getxattr(file, "user.ash-mime-type", buf, sizeof(buf) - 1)) > 0)
	85	goto found;
	86	if((sz = getxattr(file, "user.mime-type", buf, sizeof(buf) - 1)) > 0)
	87	goto found;
	88	if((sz = getxattr(file, "user.mime_type", buf, sizeof(buf) - 1)) > 0)
	89	goto found;
	90	if((sz = getxattr(file, "user.Content-Type", buf, sizeof(buf) - 1)) > 0)
	91	goto found;
	92	return(NULL);
	93	found:
	94	for(i = 0; i < sz; i++) {
	95	if((buf[i] < 32) \|\| (buf[i] >= 128))
	96	return(NULL);
	97	}
	98	buf[sz] = 0;
	99	return(buf);
	100	#else
	101	return(NULL);
	102	#endif
	103	}
	104
	105	static const char getmimetype(char file, struct stat *sb)
	106	{
	107	const char *ret;
	108
	109	if((ret = attrmimetype(file)) != NULL)
	110	return(ret);
	111	if(cookie == NULL) {
	112	cookie = magic_open(MAGIC_MIME_TYPE \| MAGIC_SYMLINK);
	113	magic_load(cookie, NULL);
	114	}
	115	if((ret = magic_file(cookie, file)) != NULL)
	116	return(ret);
	117	return("application/octet-stream");
	118	}
	119
	120	/* XXX: This could be made far better and check for other attributes
	121	* and stuff, but not now. */
	122	static const char ckctype(const char ctype)
	123	{
	124	if(!strncmp(ctype, "text/", 5) && (strchr(ctype, ';') == NULL))
	125	return(sprintf2("%s; charset=%s", ctype, nl_langinfo(CODESET)));
	126	return(ctype);
	127	}
	128
	129	static void checkcache(char file, struct stat sb)
	130	{
	131	char *hdr;
	132
	133	if((hdr = getenv("REQ_IF_MODIFIED_SINCE")) != NULL) {
	134	if(parsehttpdate(hdr) < sb->st_mtime)
	135	return;
	136	printf("HTTP/1.1 304 Not Modified\n");
	137	printf("Date: %s\n", fmthttpdate(time(NULL)));
	138	printf("Content-Length: 0\n");
	139	printf("\n");
	140	exit(0);
	141	}
	142	}
	143
	144	static void sendwhole(int fd, struct stat sb, const char contype, int head)
	145	{
	146	printf("HTTP/1.1 200 OK\n");
	147	printf("Content-Type: %s\n", contype);
	148	printf("Content-Length: %ji\n", (intmax_t)sb->st_size);
	149	printf("Last-Modified: %s\n", fmthttpdate(sb->st_mtime));
	150	printf("Date: %s\n", fmthttpdate(time(NULL)));
	151	printf("\n");
	152	fflush(stdout);
	153	if(!head)
	154	passdata(fd, 1, -1);
	155	}
	156
	157	static void sendrange(int fd, struct stat sb, const char contype, char *spec, int head)
	158	{
	159	char buf[strlen(spec) + 1];
	160	char p, e;
	161	off_t start, end;
	162
	163	if(strncmp(spec, "bytes=", 6))
	164	goto error;
	165	strcpy(buf, spec + 6);
	166	if((p = strchr(buf, '-')) == NULL)
	167	goto error;
	168	if(p == buf) {
	169	if(!p[1])
	170	goto error;
	171	end = sb->st_size;
	172	start = end - strtoll(p + 1, &e, 10);
	173	if(*e)
	174	goto error;
	175	if(start < 0)
	176	start = 0;
	177	} else {
	178	*(p++) = 0;
	179	start = strtoll(buf, &e, 10);
	180	if(*e)
	181	goto error;
	182	if(*p) {
	183	end = strtoll(p, &e, 10) + 1;
	184	if(*e)
	185	goto error;
	186	} else {
	187	end = sb->st_size;
	188	}
	189	}
	190	if(start >= sb->st_size) {
	191	printf("HTTP/1.1 416 Not satisfiable\n");
	192	printf("Content-Range: */%ji\n", (intmax_t)sb->st_size);
	193	printf("Content-Length: 0\n");
	194	printf("Last-Modified: %s\n", fmthttpdate(sb->st_mtime));
	195	printf("Date: %s\n", fmthttpdate(time(NULL)));
	196	printf("\n");
	197	return;
	198	}
	199	if((start < 0) \|\| (start >= end))
	200	goto error;
	201	if(end > sb->st_size)
	202	end = sb->st_size;
	203	errno = 0;
	204	if(lseek(fd, start, SEEK_SET) != start) {
	205	simpleerror(1, 500, "Internal Error", "Could not seek properly to beginning of requested byte range.");
	206	flog(LOG_ERR, "sendfile: could not seek properly when serving partial content: %s", strerror(errno));
	207	exit(1);
	208	}
	209	printf("HTTP/1.1 206 Partial content\n");
	210	printf("Content-Range: bytes %ji-%ji/%ji\n", (intmax_t)start, (intmax_t)(end - 1), (intmax_t)sb->st_size);
	211	printf("Content-Length: %ji\n", (intmax_t)(end - start));
	212	printf("Content-Type: %s\n", contype);
	213	printf("Last-Modified: %s\n", fmthttpdate(sb->st_mtime));
	214	printf("Date: %s\n", fmthttpdate(time(NULL)));
	215	printf("\n");
	216	fflush(stdout);
	217	if(!head)
	218	passdata(fd, 1, end - start);
	219	return;
	220
	221	error:
	222	sendwhole(fd, sb, contype, head);
	223	}
	224
	225	static void usage(void)
	226	{
	227	flog(LOG_ERR, "usage: sendfile [-c CONTENT-TYPE] [-f FILE] METHOD URL REST");
	228	}
	229
	230	int main(int argc, char **argv)
	231	{
	232	int c;
	233	char file, hdr;
	234	struct stat sb;
	235	int fd, ishead, ignrest;
	236	const char *contype;
	237
	238	setlocale(LC_ALL, "");
	239	contype = NULL;
	240	file = NULL;
	241	ignrest = 0;
	242	while((c = getopt(argc, argv, "c:f:")) >= 0) {
	243	switch(c) {
	244	case 'c':
	245	contype = optarg;
	246	break;
	247	case 'f':
	248	file = optarg;
	249	ignrest = 1;
	250	break;
	251	default:
	252	usage();
	253	exit(1);
	254	break;
	255	}
	256	}
	257	if(argc - optind < 3) {
	258	usage();
	259	exit(1);
	260	}
	261	if((file == NULL) && ((file = getenv("REQ_X_ASH_FILE")) == NULL)) {
	262	flog(LOG_ERR, "sendfile: needs to be called with either the X-Ash-File header or the -f option");
	263	exit(1);
	264	}
	265	if(!ignrest && *argv[optind + 2]) {
	266	simpleerror(1, 404, "Not Found", "The requested URL has no corresponding resource.");
	267	exit(0);
	268	}
	269	if(stat(file, &sb) \|\| ((fd = open(file, O_RDONLY)) < 0)) {
	270	flog(LOG_ERR, "sendfile: could not stat input file %s: %s", file, strerror(errno));
	271	simpleerror(1, 500, "Internal Error", "The server could not access its own data.");
	272	exit(1);
	273	}
	274	if(!strcasecmp(argv[optind], "get")) {
	275	ishead = 0;
	276	} else if(!strcasecmp(argv[optind], "head")) {
	277	ishead = 1;
	278	} else {
	279	simpleerror(1, 405, "Method not allowed", "The requested method is not defined for this resource.");
	280	return(0);
	281	}
	282	if(contype == NULL) {
	283	if((hdr = getenv("REQ_X_ASH_CONTENT_TYPE")) != NULL)
	284	contype = hdr;
	285	else
	286	contype = getmimetype(file, &sb);
	287	}
	288	contype = ckctype(contype);
	289
	290	checkcache(file, &sb);
	291
	292	if((hdr = getenv("REQ_RANGE")) != NULL)
	293	sendrange(fd, &sb, contype, hdr, ishead);
	294	else
	295	sendwhole(fd, &sb, contype, ishead);
	296	return(0);
	297	}