2 * Copyright (c) 2000-2004 Dag-Erling Coïdan Smørgrav
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer
10 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 * $FreeBSD: src/lib/libfetch/http.c,v 1.86 2008/12/15 08:27:44 murray Exp $
29 * $DragonFly: src/lib/libfetch/http.c,v 1.4 2007/08/05 21:48:12 swildner Exp $
33 * The following copyright applies to the base64 code:
36 * Copyright 1997 Massachusetts Institute of Technology
38 * Permission to use, copy, modify, and distribute this software and
39 * its documentation for any purpose and without fee is hereby
40 * granted, provided that both the above copyright notice and this
41 * permission notice appear in all copies, that both the above
42 * copyright notice and this permission notice appear in all
43 * supporting documentation, and that the name of M.I.T. not be used
44 * in advertising or publicity pertaining to distribution of the
45 * software without specific, written prior permission. M.I.T. makes
46 * no representations about the suitability of this software for any
47 * purpose. It is provided "as is" without express or implied
50 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
51 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
52 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
53 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
54 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
56 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
57 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
58 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
59 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
60 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64 #include <sys/param.h>
65 #include <sys/socket.h>
80 #include <netinet/in.h>
81 #include <netinet/tcp.h>
87 /* Maximum number of redirects to follow */
88 #define MAX_REDIRECT 5
90 /* Symbolic names for reply codes we care about */
92 #define HTTP_PARTIAL 206
93 #define HTTP_MOVED_PERM 301
94 #define HTTP_MOVED_TEMP 302
95 #define HTTP_SEE_OTHER 303
96 #define HTTP_NOT_MODIFIED 304
97 #define HTTP_TEMP_REDIRECT 307
98 #define HTTP_NEED_AUTH 401
99 #define HTTP_NEED_PROXY_AUTH 407
100 #define HTTP_BAD_RANGE 416
101 #define HTTP_PROTOCOL_ERROR 999
103 #define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \
104 || (xyz) == HTTP_MOVED_TEMP \
105 || (xyz) == HTTP_TEMP_REDIRECT \
106 || (xyz) == HTTP_SEE_OTHER)
108 #define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599)
111 /*****************************************************************************
112 * I/O functions for decoding chunked streams
117 conn_t *conn; /* connection */
118 int chunked; /* chunked mode */
119 char *buf; /* chunk buffer */
120 size_t bufsize; /* size of chunk buffer */
121 ssize_t buflen; /* amount of data currently in buffer */
122 int bufpos; /* current read offset in buffer */
123 int eof; /* end-of-file flag */
124 int error; /* error flag */
125 size_t chunksize; /* remaining size of current chunk */
132 * Get next chunk header
135 http_new_chunk(struct httpio *io)
139 if (fetch_getln(io->conn) == -1)
142 if (io->conn->buflen < 2 || !isxdigit((unsigned char)*io->conn->buf))
145 for (p = io->conn->buf; *p && !isspace((unsigned char)*p); ++p) {
148 if (!isxdigit((unsigned char)*p))
150 if (isdigit((unsigned char)*p)) {
151 io->chunksize = io->chunksize * 16 +
154 io->chunksize = io->chunksize * 16 +
155 10 + tolower((unsigned char)*p) - 'a';
161 io->total += io->chunksize;
162 if (io->chunksize == 0)
163 fprintf(stderr, "%s(): end of last chunk\n", __func__);
165 fprintf(stderr, "%s(): new chunk: %lu (%lu)\n",
166 __func__, (unsigned long)io->chunksize,
167 (unsigned long)io->total);
171 return (io->chunksize);
175 * Grow the input buffer to at least len bytes
178 http_growbuf(struct httpio *io, size_t len)
182 if (io->bufsize >= len)
185 if ((tmp = realloc(io->buf, len)) == NULL)
193 * Fill the input buffer, do chunk decoding on the fly
196 http_fillbuf(struct httpio *io, size_t len)
203 if (io->chunked == 0) {
204 if (http_growbuf(io, len) == -1)
206 if ((io->buflen = fetch_read(io->conn, io->buf, len)) == -1) {
214 if (io->chunksize == 0) {
215 switch (http_new_chunk(io)) {
225 if (len > io->chunksize)
227 if (http_growbuf(io, len) == -1)
229 if ((io->buflen = fetch_read(io->conn, io->buf, len)) == -1) {
233 io->chunksize -= io->buflen;
235 if (io->chunksize == 0) {
238 if (fetch_read(io->conn, endl, 2) != 2 ||
239 endl[0] != '\r' || endl[1] != '\n')
252 http_readfn(void *v, char *buf, int len)
254 struct httpio *io = (struct httpio *)v;
262 for (pos = 0; len > 0; pos += l, len -= l) {
264 if (!io->buf || io->bufpos == io->buflen)
265 if (http_fillbuf(io, len) < 1)
267 l = io->buflen - io->bufpos;
270 memcpy(buf + pos, io->buf + io->bufpos, l);
274 if (!pos && io->error)
283 http_writefn(void *v, const char *buf, int len)
285 struct httpio *io = (struct httpio *)v;
287 return (fetch_write(io->conn, buf, len));
294 http_closefn(void *v)
296 struct httpio *io = (struct httpio *)v;
299 r = fetch_close(io->conn);
307 * Wrap a file descriptor up
310 http_funopen(conn_t *conn, int chunked)
315 if ((io = calloc(1, sizeof(*io))) == NULL) {
320 io->chunked = chunked;
321 f = funopen(io, http_readfn, http_writefn, NULL, http_closefn);
331 /*****************************************************************************
332 * Helper functions for talking to the server and parsing its replies
345 hdr_transfer_encoding,
349 /* Names of interesting headers */
354 { hdr_content_length, "Content-Length" },
355 { hdr_content_range, "Content-Range" },
356 { hdr_last_modified, "Last-Modified" },
357 { hdr_location, "Location" },
358 { hdr_transfer_encoding, "Transfer-Encoding" },
359 { hdr_www_authenticate, "WWW-Authenticate" },
360 { hdr_unknown, NULL },
364 * Send a formatted line; optionally echo to terminal
367 http_cmd(conn_t *conn, const char *fmt, ...)
375 len = vasprintf(&msg, fmt, ap);
384 r = fetch_putln(conn, msg, len);
396 * Get and parse status line
399 http_get_reply(conn_t *conn)
403 if (fetch_getln(conn) == -1)
406 * A valid status line looks like "HTTP/m.n xyz reason" where m
407 * and n are the major and minor protocol version numbers and xyz
409 * Unfortunately, there are servers out there (NCSA 1.5.1, to name
410 * just one) that do not send a version number, so we can't rely
411 * on finding one, but if we do, insist on it being 1.0 or 1.1.
412 * We don't care about the reason phrase.
414 if (strncmp(conn->buf, "HTTP", 4) != 0)
415 return (HTTP_PROTOCOL_ERROR);
418 if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1'))
419 return (HTTP_PROTOCOL_ERROR);
423 !isdigit((unsigned char)p[1]) ||
424 !isdigit((unsigned char)p[2]) ||
425 !isdigit((unsigned char)p[3]))
426 return (HTTP_PROTOCOL_ERROR);
428 conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0');
433 * Check a header; if the type matches the given string, return a pointer
434 * to the beginning of the value.
437 http_match(const char *str, const char *hdr)
439 while (*str && *hdr &&
440 tolower((unsigned char)*str++) == tolower((unsigned char)*hdr++))
442 if (*str || *hdr != ':')
444 while (*hdr && isspace((unsigned char)*++hdr))
450 * Get the next header and return the appropriate symbolic code.
453 http_next_header(conn_t *conn, const char **p)
457 if (fetch_getln(conn) == -1)
458 return (hdr_syserror);
459 while (conn->buflen && isspace((unsigned char)conn->buf[conn->buflen - 1]))
461 conn->buf[conn->buflen] = '\0';
462 if (conn->buflen == 0)
465 * We could check for malformed headers but we don't really care.
466 * A valid header starts with a token immediately followed by a
467 * colon; a token is any sequence of non-control, non-whitespace
468 * characters except "()<>@,;:\\\"{}".
470 for (i = 0; hdr_names[i].num != hdr_unknown; i++)
471 if ((*p = http_match(hdr_names[i].name, conn->buf)) != NULL)
472 return (hdr_names[i].num);
473 return (hdr_unknown);
477 * Parse a last-modified header
480 http_parse_mtime(const char *p, time_t *mtime)
485 strncpy(locale, setlocale(LC_TIME, NULL), sizeof(locale));
486 setlocale(LC_TIME, "C");
487 r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm);
488 /* XXX should add support for date-2 and date-3 */
489 setlocale(LC_TIME, locale);
492 DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d "
494 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
495 tm.tm_hour, tm.tm_min, tm.tm_sec));
496 *mtime = timegm(&tm);
501 * Parse a content-length header
504 http_parse_length(const char *p, off_t *length)
508 for (len = 0; *p && isdigit((unsigned char)*p); ++p)
509 len = len * 10 + (*p - '0');
512 DEBUG(fprintf(stderr, "content length: [%lld]\n",
519 * Parse a content-range header
522 http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size)
524 off_t first, last, len;
526 if (strncasecmp(p, "bytes ", 6) != 0)
533 for (first = 0; *p && isdigit((unsigned char)*p); ++p)
534 first = first * 10 + *p - '0';
537 for (last = 0, ++p; *p && isdigit((unsigned char)*p); ++p)
538 last = last * 10 + *p - '0';
540 if (first > last || *p != '/')
542 for (len = 0, ++p; *p && isdigit((unsigned char)*p); ++p)
543 len = len * 10 + *p - '0';
544 if (*p || len < last - first + 1)
547 DEBUG(fprintf(stderr, "content range: [*/%lld]\n",
551 DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n",
552 (long long)first, (long long)last, (long long)len));
553 *length = last - first + 1;
561 /*****************************************************************************
562 * Helper functions for authorization
569 http_base64(const char *src)
571 static const char base64[] =
572 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
573 "abcdefghijklmnopqrstuvwxyz"
580 if ((str = malloc(((l + 2) / 3) * 4 + 1)) == NULL)
586 t = (src[0] << 16) | (src[1] << 8) | src[2];
587 dst[0] = base64[(t >> 18) & 0x3f];
588 dst[1] = base64[(t >> 12) & 0x3f];
589 dst[2] = base64[(t >> 6) & 0x3f];
590 dst[3] = base64[(t >> 0) & 0x3f];
597 t = (src[0] << 16) | (src[1] << 8);
598 dst[0] = base64[(t >> 18) & 0x3f];
599 dst[1] = base64[(t >> 12) & 0x3f];
600 dst[2] = base64[(t >> 6) & 0x3f];
607 dst[0] = base64[(t >> 18) & 0x3f];
608 dst[1] = base64[(t >> 12) & 0x3f];
609 dst[2] = dst[3] = '=';
622 * Encode username and password
625 http_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd)
630 DEBUG(fprintf(stderr, "usr: [%s]\n", usr));
631 DEBUG(fprintf(stderr, "pwd: [%s]\n", pwd));
632 if (asprintf(&upw, "%s:%s", usr, pwd) == -1)
634 auth = http_base64(upw);
638 r = http_cmd(conn, "%s: Basic %s", hdr, auth);
644 * Send an authorization header
647 http_authorize(conn_t *conn, const char *hdr, const char *p)
649 /* basic authorization */
650 if (strncasecmp(p, "basic:", 6) == 0) {
651 char *user, *pwd, *str;
655 for (p += 6; *p && *p != ':'; ++p)
657 if (!*p || strchr(++p, ':') == NULL)
659 if ((str = strdup(p)) == NULL)
660 return (-1); /* XXX */
662 pwd = strchr(str, ':');
664 r = http_basic_auth(conn, hdr, user, pwd);
672 /*****************************************************************************
673 * Helper functions for connecting to a server or proxy
677 * Connect to the correct HTTP server or proxy.
680 http_connect(struct url *URL, struct url *purl, const char *flags)
692 verbose = CHECK_FLAG('v');
696 else if (CHECK_FLAG('6'))
700 if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) {
702 } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) {
703 /* can't talk http to an ftp server */
704 /* XXX should set an error code */
708 if ((conn = fetch_connect(URL->host, URL->port, af, verbose)) == NULL)
709 /* fetch_connect() has already set an error code */
711 if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 &&
712 fetch_ssl(conn, verbose) == -1) {
721 setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, sizeof(val));
727 http_get_proxy(struct url * url, const char *flags)
732 if (flags != NULL && strchr(flags, 'd') != NULL)
734 if (fetch_no_proxy_match(url->host))
736 if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) &&
737 *p && (purl = fetchParseURL(p))) {
739 strcpy(purl->scheme, SCHEME_HTTP);
741 purl->port = fetch_default_proxy_port(purl->scheme);
742 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
750 http_print_html(FILE *out, FILE *in)
757 while ((line = fgetln(in, &len)) != NULL) {
758 while (len && isspace((unsigned char)line[len - 1]))
760 for (p = q = line; q < line + len; ++q) {
761 if (comment && *q == '-') {
762 if (q + 2 < line + len &&
763 strcmp(q, "-->") == 0) {
767 } else if (tag && !comment && *q == '>') {
770 } else if (!tag && *q == '<') {
772 fwrite(p, q - p, 1, out);
774 if (q + 3 < line + len &&
775 strcmp(q, "<!--") == 0) {
782 fwrite(p, q - p, 1, out);
788 /*****************************************************************************
793 * Send a request and process the reply
795 * XXX This function is way too long, the do..while loop should be split
796 * XXX off into a separate function.
799 http_request(struct url *URL, const char *op, struct url_stat *us,
800 struct url *purl, const char *flags)
803 char hbuf[MAXHOSTNAMELEN + 7], *host;
805 struct url *url, *new;
806 int chunked, direct, ims, need_auth, noredirect, verbose;
808 off_t offset, clength, length, size;
813 struct tm *timestruct;
815 direct = CHECK_FLAG('d');
816 noredirect = CHECK_FLAG('A');
817 verbose = CHECK_FLAG('v');
818 ims = CHECK_FLAG('i');
820 if (direct && purl) {
825 /* try the provided URL first */
828 /* if the A flag is set, we only get one try */
829 n = noredirect ? 1 : MAX_REDIRECT;
832 e = HTTP_PROTOCOL_ERROR;
845 url->port = fetch_default_port(url->scheme);
847 /* were we redirected to an FTP URL? */
848 if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) {
849 if (strcmp(op, "GET") == 0)
850 return (ftp_request(url, "RETR", us, purl, flags));
851 else if (strcmp(op, "HEAD") == 0)
852 return (ftp_request(url, "STAT", us, purl, flags));
855 /* connect to server or proxy */
856 if ((conn = http_connect(url, purl, flags)) == NULL)
861 if (strchr(url->host, ':')) {
862 snprintf(hbuf, sizeof(hbuf), "[%s]", url->host);
866 if (url->port != fetch_default_port(url->scheme)) {
871 snprintf(hbuf + strlen(hbuf),
872 sizeof(hbuf) - strlen(hbuf), ":%d", url->port);
877 fetch_info("requesting %s://%s%s",
878 url->scheme, host, url->doc);
880 http_cmd(conn, "%s %s://%s%s HTTP/1.1",
881 op, url->scheme, host, url->doc);
883 http_cmd(conn, "%s %s HTTP/1.1",
887 if (ims && url->ims_time) {
888 timestruct = gmtime((time_t *)&url->ims_time);
889 (void)strftime(timebuf, 80, "%a, %d %b %Y %T GMT",
892 fetch_info("If-Modified-Since: %s", timebuf);
893 http_cmd(conn, "If-Modified-Since: %s", timebuf);
896 http_cmd(conn, "Host: %s", host);
898 /* proxy authorization */
900 if (*purl->user || *purl->pwd)
901 http_basic_auth(conn, "Proxy-Authorization",
902 purl->user, purl->pwd);
903 else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && *p != '\0')
904 http_authorize(conn, "Proxy-Authorization", p);
907 /* server authorization */
908 if (need_auth || *url->user || *url->pwd) {
909 if (*url->user || *url->pwd)
910 http_basic_auth(conn, "Authorization", url->user, url->pwd);
911 else if ((p = getenv("HTTP_AUTH")) != NULL && *p != '\0')
912 http_authorize(conn, "Authorization", p);
913 else if (fetchAuthMethod && fetchAuthMethod(url) == 0) {
914 http_basic_auth(conn, "Authorization", url->user, url->pwd);
916 http_seterr(HTTP_NEED_AUTH);
922 if ((p = getenv("HTTP_REFERER")) != NULL && *p != '\0') {
923 if (strcasecmp(p, "auto") == 0)
924 http_cmd(conn, "Referer: %s://%s%s",
925 url->scheme, host, url->doc);
927 http_cmd(conn, "Referer: %s", p);
929 if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0')
930 http_cmd(conn, "User-Agent: %s", p);
932 http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER, getprogname());
934 http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset);
935 http_cmd(conn, "Connection: close");
939 * Force the queued request to be dispatched. Normally, one
940 * would do this with shutdown(2) but squid proxies can be
941 * configured to disallow such half-closed connections. To
942 * be compatible with such configurations, fiddle with socket
943 * options to force the pending data to be written.
946 setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val,
949 setsockopt(conn->sd, IPPROTO_TCP, TCP_NODELAY, &val,
953 switch (http_get_reply(conn)) {
956 case HTTP_NOT_MODIFIED:
959 case HTTP_MOVED_PERM:
960 case HTTP_MOVED_TEMP:
963 * Not so fine, but we still have to read the
964 * headers to get the new location.
970 * We already sent out authorization code,
971 * so there's nothing more we can do.
973 http_seterr(conn->err);
976 /* try again, but send the password this time */
978 fetch_info("server requires authorization");
980 case HTTP_NEED_PROXY_AUTH:
982 * If we're talking to a proxy, we already sent
983 * our proxy authorization code, so there's
984 * nothing more we can do.
986 http_seterr(conn->err);
990 * This can happen if we ask for 0 bytes because
991 * we already have the whole file. Consider this
992 * a success for now, and check sizes later.
995 case HTTP_PROTOCOL_ERROR:
1001 http_seterr(conn->err);
1004 /* fall through so we can get the full error message */
1009 switch ((h = http_next_header(conn, &p))) {
1014 http_seterr(HTTP_PROTOCOL_ERROR);
1016 case hdr_content_length:
1017 http_parse_length(p, &clength);
1019 case hdr_content_range:
1020 http_parse_range(p, &offset, &length, &size);
1022 case hdr_last_modified:
1023 http_parse_mtime(p, &mtime);
1026 if (!HTTP_REDIRECT(conn->err))
1031 fetch_info("%d redirect to %s", conn->err, p);
1034 new = fetchMakeURL(url->scheme, url->host, url->port, p,
1035 url->user, url->pwd);
1037 new = fetchParseURL(p);
1039 /* XXX should set an error code */
1040 DEBUG(fprintf(stderr, "failed to parse new URL\n"));
1043 if (!*new->user && !*new->pwd) {
1044 strcpy(new->user, url->user);
1045 strcpy(new->pwd, url->pwd);
1047 new->offset = url->offset;
1048 new->length = url->length;
1050 case hdr_transfer_encoding:
1052 chunked = (strcasecmp(p, "chunked") == 0);
1054 case hdr_www_authenticate:
1055 if (conn->err != HTTP_NEED_AUTH)
1057 /* if we were smarter, we'd check the method and realm */
1065 } while (h > hdr_end);
1067 /* we need to provide authentication */
1068 if (conn->err == HTTP_NEED_AUTH) {
1076 /* requested range not satisfiable */
1077 if (conn->err == HTTP_BAD_RANGE) {
1078 if (url->offset == size && url->length == 0) {
1079 /* asked for 0 bytes; fake it */
1080 offset = url->offset;
1082 conn->err = HTTP_OK;
1085 http_seterr(conn->err);
1090 /* we have a hit or an error */
1091 if (conn->err == HTTP_OK
1092 || conn->err == HTTP_NOT_MODIFIED
1093 || conn->err == HTTP_PARTIAL
1094 || HTTP_ERROR(conn->err))
1097 /* all other cases: we got a redirect */
1103 DEBUG(fprintf(stderr, "redirect with no new location\n"));
1111 /* we failed, or ran out of retries */
1117 DEBUG(fprintf(stderr, "offset %lld, length %lld,"
1118 " size %lld, clength %lld\n",
1119 (long long)offset, (long long)length,
1120 (long long)size, (long long)clength));
1122 if (conn->err == HTTP_NOT_MODIFIED) {
1123 http_seterr(HTTP_NOT_MODIFIED);
1127 /* check for inconsistencies */
1128 if (clength != -1 && length != -1 && clength != length) {
1129 http_seterr(HTTP_PROTOCOL_ERROR);
1135 length = offset + clength;
1136 if (length != -1 && size != -1 && length != size) {
1137 http_seterr(HTTP_PROTOCOL_ERROR);
1146 us->atime = us->mtime = mtime;
1150 if (URL->offset > 0 && offset > URL->offset) {
1151 http_seterr(HTTP_PROTOCOL_ERROR);
1155 /* report back real offset and size */
1156 URL->offset = offset;
1157 URL->length = clength;
1159 /* wrap it up in a FILE */
1160 if ((f = http_funopen(conn, chunked)) == NULL) {
1170 if (HTTP_ERROR(conn->err)) {
1171 http_print_html(stderr, f);
1189 /*****************************************************************************
1194 * Retrieve and stat a file by HTTP
1197 fetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags)
1199 return (http_request(URL, "GET", us, http_get_proxy(URL, flags), flags));
1203 * Retrieve a file by HTTP
1206 fetchGetHTTP(struct url *URL, const char *flags)
1208 return (fetchXGetHTTP(URL, NULL, flags));
1212 * Store a file by HTTP
1215 fetchPutHTTP(struct url *URL __unused, const char *flags __unused)
1217 warnx("fetchPutHTTP(): not implemented");
1222 * Get an HTTP document's metadata
1225 fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags)
1229 f = http_request(URL, "HEAD", us, http_get_proxy(URL, flags), flags);
1240 fetchListHTTP(struct url *url __unused, const char *flags __unused)
1242 warnx("fetchListHTTP(): not implemented");