http.c revision 104404
137535Sdes/*- 263012Sdes * Copyright (c) 2000 Dag-Erling Co�dan Sm�rgrav 337535Sdes * All rights reserved. 437535Sdes * 537535Sdes * Redistribution and use in source and binary forms, with or without 637535Sdes * modification, are permitted provided that the following conditions 737535Sdes * are met: 837535Sdes * 1. Redistributions of source code must retain the above copyright 937535Sdes * notice, this list of conditions and the following disclaimer 1037535Sdes * in this position and unchanged. 1137535Sdes * 2. Redistributions in binary form must reproduce the above copyright 1237535Sdes * notice, this list of conditions and the following disclaimer in the 1337535Sdes * documentation and/or other materials provided with the distribution. 1437535Sdes * 3. The name of the author may not be used to endorse or promote products 1563012Sdes * derived from this software without specific prior written permission. 1637535Sdes * 1737535Sdes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 1837535Sdes * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 1937535Sdes * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 2037535Sdes * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 2137535Sdes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2237535Sdes * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2337535Sdes * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2437535Sdes * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2537535Sdes * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 2637535Sdes * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2737535Sdes */ 2837535Sdes 2984203Sdillon#include <sys/cdefs.h> 3084203Sdillon__FBSDID("$FreeBSD: head/lib/libfetch/http.c 104404 2002-10-03 10:42:19Z ru $"); 3184203Sdillon 3263236Sdes/* 3363236Sdes * The following copyright applies to the base64 code: 3463236Sdes * 3563236Sdes *- 3663236Sdes * Copyright 1997 Massachusetts Institute of Technology 3763236Sdes * 3863236Sdes * Permission to use, copy, modify, and distribute this software and 3963236Sdes * its documentation for any purpose and without fee is hereby 4063236Sdes * granted, provided that both the above copyright notice and this 4163236Sdes * permission notice appear in all copies, that both the above 4263236Sdes * copyright notice and this permission notice appear in all 4363236Sdes * supporting documentation, and that the name of M.I.T. not be used 4463236Sdes * in advertising or publicity pertaining to distribution of the 4563236Sdes * software without specific, written prior permission. M.I.T. makes 4663236Sdes * no representations about the suitability of this software for any 4763236Sdes * purpose. It is provided "as is" without express or implied 4863236Sdes * warranty. 4990267Sdes * 5063236Sdes * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 5163236Sdes * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 5263236Sdes * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 5363236Sdes * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 5463236Sdes * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 5563236Sdes * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 5663236Sdes * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 5763236Sdes * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 5863236Sdes * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 5963236Sdes * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 6063236Sdes * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 6163236Sdes * SUCH DAMAGE. 6263236Sdes */ 6363236Sdes 6437535Sdes#include <sys/param.h> 6560737Sume#include <sys/socket.h> 6637535Sdes 6763012Sdes#include <ctype.h> 6837535Sdes#include <err.h> 6963012Sdes#include <errno.h> 7060376Sdes#include <locale.h> 7160189Sdes#include <netdb.h> 7237608Sdes#include <stdarg.h> 7337535Sdes#include <stdio.h> 7437535Sdes#include <stdlib.h> 7537535Sdes#include <string.h> 7660376Sdes#include <time.h> 7737535Sdes#include <unistd.h> 7837535Sdes 7937535Sdes#include "fetch.h" 8040939Sdes#include "common.h" 8141862Sdes#include "httperr.h" 8237535Sdes 8363012Sdes/* Maximum number of redirects to follow */ 8463012Sdes#define MAX_REDIRECT 5 8537535Sdes 8663012Sdes/* Symbolic names for reply codes we care about */ 8763012Sdes#define HTTP_OK 200 8863012Sdes#define HTTP_PARTIAL 206 8963012Sdes#define HTTP_MOVED_PERM 301 9063012Sdes#define HTTP_MOVED_TEMP 302 9163012Sdes#define HTTP_SEE_OTHER 303 9263012Sdes#define HTTP_NEED_AUTH 401 9387317Sdes#define HTTP_NEED_PROXY_AUTH 407 9463012Sdes#define HTTP_PROTOCOL_ERROR 999 9560196Sdes 9663012Sdes#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \ 9790267Sdes || (xyz) == HTTP_MOVED_TEMP \ 9890267Sdes || (xyz) == HTTP_SEE_OTHER) 9963012Sdes 10088771Sdes#define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599) 10163012Sdes 10290267Sdes 10363012Sdes/***************************************************************************** 10463012Sdes * I/O functions for decoding chunked streams 10563012Sdes */ 10663012Sdes 10797859Sdesstruct httpio 10837535Sdes{ 10997858Sdes conn_t *conn; /* connection */ 11097866Sdes int chunked; /* chunked mode */ 11197858Sdes char *buf; /* chunk buffer */ 11297866Sdes size_t bufsize; /* size of chunk buffer */ 11397866Sdes ssize_t buflen; /* amount of data currently in buffer */ 11497866Sdes int bufpos; /* current read offset in buffer */ 11597858Sdes int eof; /* end-of-file flag */ 11697858Sdes int error; /* error flag */ 11797858Sdes size_t chunksize; /* remaining size of current chunk */ 11863281Sdes#ifndef NDEBUG 11990267Sdes size_t total; 12063012Sdes#endif 12137535Sdes}; 12237535Sdes 12337608Sdes/* 12463012Sdes * Get next chunk header 12537608Sdes */ 12637608Sdesstatic int 12797859Sdes_http_new_chunk(struct httpio *io) 12837608Sdes{ 12990267Sdes char *p; 13090267Sdes 13197859Sdes if (_fetch_getln(io->conn) == -1) 13290267Sdes return (-1); 13390267Sdes 13497859Sdes if (io->conn->buflen < 2 || !ishexnumber(*io->conn->buf)) 13590267Sdes return (-1); 13690267Sdes 13797859Sdes for (p = io->conn->buf; *p && !isspace(*p); ++p) { 13890267Sdes if (*p == ';') 13990267Sdes break; 14090267Sdes if (!ishexnumber(*p)) 14190267Sdes return (-1); 14290267Sdes if (isdigit(*p)) { 14397859Sdes io->chunksize = io->chunksize * 16 + 14490267Sdes *p - '0'; 14590267Sdes } else { 14697859Sdes io->chunksize = io->chunksize * 16 + 14790267Sdes 10 + tolower(*p) - 'a'; 14890267Sdes } 14990267Sdes } 15090267Sdes 15163281Sdes#ifndef NDEBUG 15290267Sdes if (fetchDebug) { 15397859Sdes io->total += io->chunksize; 15497859Sdes if (io->chunksize == 0) 15590267Sdes fprintf(stderr, "_http_fillbuf(): " 15690267Sdes "end of last chunk\n"); 15790267Sdes else 15890267Sdes fprintf(stderr, "_http_fillbuf(): " 15990267Sdes "new chunk: %lu (%lu)\n", 16097859Sdes (unsigned long)io->chunksize, (unsigned long)io->total); 16190267Sdes } 16263012Sdes#endif 16390267Sdes 16497859Sdes return (io->chunksize); 16537608Sdes} 16637608Sdes 16737608Sdes/* 16897866Sdes * Grow the input buffer to at least len bytes 16997866Sdes */ 17097866Sdesstatic inline int 17197866Sdes_http_growbuf(struct httpio *io, size_t len) 17297866Sdes{ 17397866Sdes char *tmp; 17497866Sdes 17597866Sdes if (io->bufsize >= len) 17697866Sdes return (0); 17797866Sdes 17897866Sdes if ((tmp = realloc(io->buf, len)) == NULL) 17997866Sdes return (-1); 18097866Sdes io->buf = tmp; 18197866Sdes io->bufsize = len; 18297866Sdes} 18397866Sdes 18497866Sdes/* 18537608Sdes * Fill the input buffer, do chunk decoding on the fly 18637608Sdes */ 18763012Sdesstatic int 18897866Sdes_http_fillbuf(struct httpio *io, size_t len) 18937535Sdes{ 19097859Sdes if (io->error) 19190267Sdes return (-1); 19297859Sdes if (io->eof) 19390267Sdes return (0); 19490267Sdes 19597866Sdes if (io->chunked == 0) { 19697866Sdes if (_http_growbuf(io, len) == -1) 19797866Sdes return (-1); 19897866Sdes if ((io->buflen = _fetch_read(io->conn, io->buf, len)) == -1) 19997866Sdes return (-1); 20097866Sdes io->bufpos = 0; 20197866Sdes return (io->buflen); 20297866Sdes } 20397866Sdes 20497859Sdes if (io->chunksize == 0) { 20597859Sdes switch (_http_new_chunk(io)) { 20690267Sdes case -1: 20797859Sdes io->error = 1; 20890267Sdes return (-1); 20990267Sdes case 0: 21097859Sdes io->eof = 1; 21190267Sdes return (0); 21290267Sdes } 21337535Sdes } 21463012Sdes 21597866Sdes if (len > io->chunksize) 21697866Sdes len = io->chunksize; 21797866Sdes if (_http_growbuf(io, len) == -1) 21890267Sdes return (-1); 21997866Sdes if ((io->buflen = _fetch_read(io->conn, io->buf, len)) == -1) 22097866Sdes return (-1); 22197866Sdes io->chunksize -= io->buflen; 22290267Sdes 22397859Sdes if (io->chunksize == 0) { 22497856Sdes char endl[2]; 22597856Sdes 22697866Sdes if (_fetch_read(io->conn, endl, 2) != 2 || 22797856Sdes endl[0] != '\r' || endl[1] != '\n') 22890267Sdes return (-1); 22990267Sdes } 23090267Sdes 23197866Sdes io->bufpos = 0; 23290267Sdes 23397866Sdes return (io->buflen); 23437535Sdes} 23537535Sdes 23637608Sdes/* 23737608Sdes * Read function 23837608Sdes */ 23937535Sdesstatic int 24063012Sdes_http_readfn(void *v, char *buf, int len) 24137535Sdes{ 24297859Sdes struct httpio *io = (struct httpio *)v; 24390267Sdes int l, pos; 24463012Sdes 24597859Sdes if (io->error) 24690267Sdes return (-1); 24797859Sdes if (io->eof) 24890267Sdes return (0); 24963012Sdes 25090267Sdes for (pos = 0; len > 0; pos += l, len -= l) { 25190267Sdes /* empty buffer */ 25297866Sdes if (!io->buf || io->bufpos == io->buflen) 25397866Sdes if (_http_fillbuf(io, len) < 1) 25490267Sdes break; 25597866Sdes l = io->buflen - io->bufpos; 25690267Sdes if (len < l) 25790267Sdes l = len; 25897866Sdes bcopy(io->buf + io->bufpos, buf + pos, l); 25997866Sdes io->bufpos += l; 26090267Sdes } 26137535Sdes 26297859Sdes if (!pos && io->error) 26390267Sdes return (-1); 26490267Sdes return (pos); 26537535Sdes} 26637535Sdes 26737608Sdes/* 26837608Sdes * Write function 26937608Sdes */ 27037535Sdesstatic int 27163012Sdes_http_writefn(void *v, const char *buf, int len) 27237535Sdes{ 27397859Sdes struct httpio *io = (struct httpio *)v; 27490267Sdes 27597866Sdes return (_fetch_write(io->conn, buf, len)); 27637535Sdes} 27737535Sdes 27837608Sdes/* 27937608Sdes * Close function 28037608Sdes */ 28137535Sdesstatic int 28263012Sdes_http_closefn(void *v) 28337535Sdes{ 28497859Sdes struct httpio *io = (struct httpio *)v; 28590267Sdes int r; 28663012Sdes 28797859Sdes r = _fetch_close(io->conn); 28897859Sdes if (io->buf) 28997859Sdes free(io->buf); 29097859Sdes free(io); 29190267Sdes return (r); 29237535Sdes} 29337535Sdes 29437608Sdes/* 29563012Sdes * Wrap a file descriptor up 29637608Sdes */ 29763012Sdesstatic FILE * 29897866Sdes_http_funopen(conn_t *conn, int chunked) 29937535Sdes{ 30097859Sdes struct httpio *io; 30190267Sdes FILE *f; 30263012Sdes 30397859Sdes if ((io = calloc(1, sizeof *io)) == NULL) { 30490267Sdes _fetch_syserr(); 30590267Sdes return (NULL); 30690267Sdes } 30797859Sdes io->conn = conn; 30897866Sdes io->chunked = chunked; 30997859Sdes f = funopen(io, _http_readfn, _http_writefn, NULL, _http_closefn); 31090267Sdes if (f == NULL) { 31190267Sdes _fetch_syserr(); 31297859Sdes free(io); 31390267Sdes return (NULL); 31490267Sdes } 31590267Sdes return (f); 31663012Sdes} 31763012Sdes 31890267Sdes 31963012Sdes/***************************************************************************** 32063012Sdes * Helper functions for talking to the server and parsing its replies 32163012Sdes */ 32263012Sdes 32363012Sdes/* Header types */ 32463012Sdestypedef enum { 32590267Sdes hdr_syserror = -2, 32690267Sdes hdr_error = -1, 32790267Sdes hdr_end = 0, 32890267Sdes hdr_unknown = 1, 32990267Sdes hdr_content_length, 33090267Sdes hdr_content_range, 33190267Sdes hdr_last_modified, 33290267Sdes hdr_location, 33390267Sdes hdr_transfer_encoding, 33490267Sdes hdr_www_authenticate 33585093Sdes} hdr_t; 33663012Sdes 33763012Sdes/* Names of interesting headers */ 33863012Sdesstatic struct { 33990267Sdes hdr_t num; 34090267Sdes const char *name; 34163012Sdes} hdr_names[] = { 34290267Sdes { hdr_content_length, "Content-Length" }, 34390267Sdes { hdr_content_range, "Content-Range" }, 34490267Sdes { hdr_last_modified, "Last-Modified" }, 34590267Sdes { hdr_location, "Location" }, 34690267Sdes { hdr_transfer_encoding, "Transfer-Encoding" }, 34790267Sdes { hdr_www_authenticate, "WWW-Authenticate" }, 34890267Sdes { hdr_unknown, NULL }, 34963012Sdes}; 35063012Sdes 35163012Sdes/* 35263012Sdes * Send a formatted line; optionally echo to terminal 35363012Sdes */ 35463012Sdesstatic int 35597856Sdes_http_cmd(conn_t *conn, const char *fmt, ...) 35663012Sdes{ 35790267Sdes va_list ap; 35890267Sdes size_t len; 35990267Sdes char *msg; 36090267Sdes int r; 36163012Sdes 36290267Sdes va_start(ap, fmt); 36390267Sdes len = vasprintf(&msg, fmt, ap); 36490267Sdes va_end(ap); 36590267Sdes 36690267Sdes if (msg == NULL) { 36790267Sdes errno = ENOMEM; 36890267Sdes _fetch_syserr(); 36990267Sdes return (-1); 37090267Sdes } 37190267Sdes 37297856Sdes r = _fetch_putln(conn, msg, len); 37390267Sdes free(msg); 37490267Sdes 37590267Sdes if (r == -1) { 37690267Sdes _fetch_syserr(); 37790267Sdes return (-1); 37890267Sdes } 37990267Sdes 38090267Sdes return (0); 38163012Sdes} 38263012Sdes 38363012Sdes/* 38463012Sdes * Get and parse status line 38563012Sdes */ 38663012Sdesstatic int 38797856Sdes_http_get_reply(conn_t *conn) 38863012Sdes{ 38990267Sdes char *p; 39090267Sdes 39197856Sdes if (_fetch_getln(conn) == -1) 39290267Sdes return (-1); 39390267Sdes /* 39490267Sdes * A valid status line looks like "HTTP/m.n xyz reason" where m 39590267Sdes * and n are the major and minor protocol version numbers and xyz 39690267Sdes * is the reply code. 39790267Sdes * Unfortunately, there are servers out there (NCSA 1.5.1, to name 39890267Sdes * just one) that do not send a version number, so we can't rely 39990267Sdes * on finding one, but if we do, insist on it being 1.0 or 1.1. 40090267Sdes * We don't care about the reason phrase. 40190267Sdes */ 40297856Sdes if (strncmp(conn->buf, "HTTP", 4) != 0) 40390267Sdes return (HTTP_PROTOCOL_ERROR); 40497856Sdes p = conn->buf + 4; 40590267Sdes if (*p == '/') { 40690267Sdes if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) 40790267Sdes return (HTTP_PROTOCOL_ERROR); 40890267Sdes p += 4; 40990267Sdes } 41090267Sdes if (*p != ' ' || !isdigit(p[1]) || !isdigit(p[2]) || !isdigit(p[3])) 41190267Sdes return (HTTP_PROTOCOL_ERROR); 41290267Sdes 41397856Sdes conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0'); 41497856Sdes return (conn->err); 41537535Sdes} 41637535Sdes 41737608Sdes/* 41890267Sdes * Check a header; if the type matches the given string, return a pointer 41990267Sdes * to the beginning of the value. 42063012Sdes */ 42175891Sarchiestatic const char * 42275891Sarchie_http_match(const char *str, const char *hdr) 42363012Sdes{ 42490267Sdes while (*str && *hdr && tolower(*str++) == tolower(*hdr++)) 42590267Sdes /* nothing */; 42690267Sdes if (*str || *hdr != ':') 42790267Sdes return (NULL); 42890267Sdes while (*hdr && isspace(*++hdr)) 42990267Sdes /* nothing */; 43090267Sdes return (hdr); 43163012Sdes} 43263012Sdes 43363012Sdes/* 43463012Sdes * Get the next header and return the appropriate symbolic code. 43563012Sdes */ 43685093Sdesstatic hdr_t 43797856Sdes_http_next_header(conn_t *conn, const char **p) 43863012Sdes{ 43990267Sdes int i; 44090267Sdes 44197856Sdes if (_fetch_getln(conn) == -1) 44290267Sdes return (hdr_syserror); 44397856Sdes while (conn->buflen && isspace(conn->buf[conn->buflen - 1])) 44497856Sdes conn->buflen--; 44597856Sdes conn->buf[conn->buflen] = '\0'; 44697856Sdes if (conn->buflen == 0) 44797856Sdes return (hdr_end); 44890267Sdes /* 44990267Sdes * We could check for malformed headers but we don't really care. 45090267Sdes * A valid header starts with a token immediately followed by a 45190267Sdes * colon; a token is any sequence of non-control, non-whitespace 45290267Sdes * characters except "()<>@,;:\\\"{}". 45390267Sdes */ 45490267Sdes for (i = 0; hdr_names[i].num != hdr_unknown; i++) 45597856Sdes if ((*p = _http_match(hdr_names[i].name, conn->buf)) != NULL) 45690267Sdes return (hdr_names[i].num); 45790267Sdes return (hdr_unknown); 45863012Sdes} 45963012Sdes 46063012Sdes/* 46163012Sdes * Parse a last-modified header 46263012Sdes */ 46363716Sdesstatic int 46475891Sarchie_http_parse_mtime(const char *p, time_t *mtime) 46563012Sdes{ 46690267Sdes char locale[64], *r; 46790267Sdes struct tm tm; 46863012Sdes 46990267Sdes strncpy(locale, setlocale(LC_TIME, NULL), sizeof locale); 47090267Sdes setlocale(LC_TIME, "C"); 47190267Sdes r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); 47290267Sdes /* XXX should add support for date-2 and date-3 */ 47390267Sdes setlocale(LC_TIME, locale); 47490267Sdes if (r == NULL) 47590267Sdes return (-1); 47690267Sdes DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d " 47788769Sdes "%02d:%02d:%02d]\n", 47863012Sdes tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 47963012Sdes tm.tm_hour, tm.tm_min, tm.tm_sec)); 48090267Sdes *mtime = timegm(&tm); 48190267Sdes return (0); 48263012Sdes} 48363012Sdes 48463012Sdes/* 48563012Sdes * Parse a content-length header 48663012Sdes */ 48763716Sdesstatic int 48875891Sarchie_http_parse_length(const char *p, off_t *length) 48963012Sdes{ 49090267Sdes off_t len; 49190267Sdes 49290267Sdes for (len = 0; *p && isdigit(*p); ++p) 49390267Sdes len = len * 10 + (*p - '0'); 49490267Sdes if (*p) 49590267Sdes return (-1); 49690267Sdes DEBUG(fprintf(stderr, "content length: [%lld]\n", 49790267Sdes (long long)len)); 49890267Sdes *length = len; 49990267Sdes return (0); 50063012Sdes} 50163012Sdes 50263012Sdes/* 50363012Sdes * Parse a content-range header 50463012Sdes */ 50563716Sdesstatic int 50675891Sarchie_http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size) 50763012Sdes{ 50890267Sdes off_t first, last, len; 50963716Sdes 51090267Sdes if (strncasecmp(p, "bytes ", 6) != 0) 51190267Sdes return (-1); 51290267Sdes for (first = 0, p += 6; *p && isdigit(*p); ++p) 51390267Sdes first = first * 10 + *p - '0'; 51490267Sdes if (*p != '-') 51590267Sdes return (-1); 51690267Sdes for (last = 0, ++p; *p && isdigit(*p); ++p) 51790267Sdes last = last * 10 + *p - '0'; 51890267Sdes if (first > last || *p != '/') 51990267Sdes return (-1); 52090267Sdes for (len = 0, ++p; *p && isdigit(*p); ++p) 52190267Sdes len = len * 10 + *p - '0'; 52290267Sdes if (*p || len < last - first + 1) 52390267Sdes return (-1); 52490267Sdes DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n", 52590267Sdes (long long)first, (long long)last, (long long)len)); 52690267Sdes *offset = first; 52790267Sdes *length = last - first + 1; 52890267Sdes *size = len; 52990267Sdes return (0); 53063012Sdes} 53163012Sdes 53290267Sdes 53363012Sdes/***************************************************************************** 53463012Sdes * Helper functions for authorization 53563012Sdes */ 53663012Sdes 53763012Sdes/* 53837608Sdes * Base64 encoding 53937608Sdes */ 54062965Sdesstatic char * 54190267Sdes_http_base64(const char *src) 54237608Sdes{ 54390267Sdes static const char base64[] = 54490267Sdes "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 54590267Sdes "abcdefghijklmnopqrstuvwxyz" 54690267Sdes "0123456789+/"; 54790267Sdes char *str, *dst; 54890267Sdes size_t l; 54990267Sdes int t, r; 55062965Sdes 55190267Sdes l = strlen(src); 55290267Sdes if ((str = malloc(((l + 2) / 3) * 4)) == NULL) 55390267Sdes return (NULL); 55490267Sdes dst = str; 55590267Sdes r = 0; 55637608Sdes 55790267Sdes while (l >= 3) { 55890267Sdes t = (src[0] << 16) | (src[1] << 8) | src[2]; 55990267Sdes dst[0] = base64[(t >> 18) & 0x3f]; 56090267Sdes dst[1] = base64[(t >> 12) & 0x3f]; 56190267Sdes dst[2] = base64[(t >> 6) & 0x3f]; 56290267Sdes dst[3] = base64[(t >> 0) & 0x3f]; 56390267Sdes src += 3; l -= 3; 56490267Sdes dst += 4; r += 4; 56590267Sdes } 56637608Sdes 56790267Sdes switch (l) { 56890267Sdes case 2: 56990267Sdes t = (src[0] << 16) | (src[1] << 8); 57090267Sdes dst[0] = base64[(t >> 18) & 0x3f]; 57190267Sdes dst[1] = base64[(t >> 12) & 0x3f]; 57290267Sdes dst[2] = base64[(t >> 6) & 0x3f]; 57390267Sdes dst[3] = '='; 57490267Sdes dst += 4; 57590267Sdes r += 4; 57690267Sdes break; 57790267Sdes case 1: 57890267Sdes t = src[0] << 16; 57990267Sdes dst[0] = base64[(t >> 18) & 0x3f]; 58090267Sdes dst[1] = base64[(t >> 12) & 0x3f]; 58190267Sdes dst[2] = dst[3] = '='; 58290267Sdes dst += 4; 58390267Sdes r += 4; 58490267Sdes break; 58590267Sdes case 0: 58690267Sdes break; 58790267Sdes } 58890267Sdes 58990267Sdes *dst = 0; 59090267Sdes return (str); 59137608Sdes} 59237608Sdes 59337608Sdes/* 59437608Sdes * Encode username and password 59537608Sdes */ 59662965Sdesstatic int 59797856Sdes_http_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd) 59837608Sdes{ 59990267Sdes char *upw, *auth; 60090267Sdes int r; 60137608Sdes 60290267Sdes DEBUG(fprintf(stderr, "usr: [%s]\n", usr)); 60390267Sdes DEBUG(fprintf(stderr, "pwd: [%s]\n", pwd)); 60490267Sdes if (asprintf(&upw, "%s:%s", usr, pwd) == -1) 60590267Sdes return (-1); 60690267Sdes auth = _http_base64(upw); 60790267Sdes free(upw); 60890267Sdes if (auth == NULL) 60990267Sdes return (-1); 61097856Sdes r = _http_cmd(conn, "%s: Basic %s", hdr, auth); 61190267Sdes free(auth); 61290267Sdes return (r); 61362965Sdes} 61462965Sdes 61562965Sdes/* 61662965Sdes * Send an authorization header 61762965Sdes */ 61862965Sdesstatic int 61997856Sdes_http_authorize(conn_t *conn, const char *hdr, const char *p) 62062965Sdes{ 62190267Sdes /* basic authorization */ 62290267Sdes if (strncasecmp(p, "basic:", 6) == 0) { 62390267Sdes char *user, *pwd, *str; 62490267Sdes int r; 62562965Sdes 62690267Sdes /* skip realm */ 62790267Sdes for (p += 6; *p && *p != ':'; ++p) 62890267Sdes /* nothing */ ; 62990267Sdes if (!*p || strchr(++p, ':') == NULL) 63090267Sdes return (-1); 63190267Sdes if ((str = strdup(p)) == NULL) 63290267Sdes return (-1); /* XXX */ 63390267Sdes user = str; 63490267Sdes pwd = strchr(str, ':'); 63590267Sdes *pwd++ = '\0'; 63697856Sdes r = _http_basic_auth(conn, hdr, user, pwd); 63790267Sdes free(str); 63890267Sdes return (r); 63990267Sdes } 64090267Sdes return (-1); 64137608Sdes} 64237608Sdes 64390267Sdes 64463012Sdes/***************************************************************************** 64563012Sdes * Helper functions for connecting to a server or proxy 64663012Sdes */ 64763012Sdes 64837608Sdes/* 64990267Sdes * Connect to the correct HTTP server or proxy. 65063012Sdes */ 65197856Sdesstatic conn_t * 65275891Sarchie_http_connect(struct url *URL, struct url *purl, const char *flags) 65363012Sdes{ 65497856Sdes conn_t *conn; 65590267Sdes int verbose; 65697856Sdes int af; 65790267Sdes 65863012Sdes#ifdef INET6 65990267Sdes af = AF_UNSPEC; 66060737Sume#else 66190267Sdes af = AF_INET; 66260737Sume#endif 66390267Sdes 66490267Sdes verbose = CHECK_FLAG('v'); 66590267Sdes if (CHECK_FLAG('4')) 66690267Sdes af = AF_INET; 66767043Sdes#ifdef INET6 66890267Sdes else if (CHECK_FLAG('6')) 66990267Sdes af = AF_INET6; 67067043Sdes#endif 67167043Sdes 67297868Sdes if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) { 67390267Sdes URL = purl; 67490267Sdes } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 67590267Sdes /* can't talk http to an ftp server */ 67690267Sdes /* XXX should set an error code */ 67797856Sdes return (NULL); 67890267Sdes } 67990267Sdes 68097856Sdes if ((conn = _fetch_connect(URL->host, URL->port, af, verbose)) == NULL) 68190267Sdes /* _fetch_connect() has already set an error code */ 68297856Sdes return (NULL); 68397868Sdes if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && 68497868Sdes _fetch_ssl(conn, verbose) == -1) { 68597868Sdes _fetch_close(conn); 68697891Sdes /* grrr */ 68797891Sdes errno = EAUTH; 68897891Sdes _fetch_syserr(); 68997868Sdes return (NULL); 69097868Sdes } 69197856Sdes return (conn); 69267043Sdes} 69367043Sdes 69467043Sdesstatic struct url * 69575891Sarchie_http_get_proxy(void) 69667043Sdes{ 69790267Sdes struct url *purl; 69890267Sdes char *p; 69990267Sdes 70090267Sdes if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 70190267Sdes (purl = fetchParseURL(p))) { 70290267Sdes if (!*purl->scheme) 70390267Sdes strcpy(purl->scheme, SCHEME_HTTP); 70490267Sdes if (!purl->port) 70590267Sdes purl->port = _fetch_default_proxy_port(purl->scheme); 70690267Sdes if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 70790267Sdes return (purl); 70890267Sdes fetchFreeURL(purl); 70990267Sdes } 71090267Sdes return (NULL); 71160376Sdes} 71260376Sdes 71388771Sdesstatic void 71488771Sdes_http_print_html(FILE *out, FILE *in) 71588771Sdes{ 71690267Sdes size_t len; 71790267Sdes char *line, *p, *q; 71890267Sdes int comment, tag; 71988771Sdes 72090267Sdes comment = tag = 0; 72190267Sdes while ((line = fgetln(in, &len)) != NULL) { 72290267Sdes while (len && isspace(line[len - 1])) 72390267Sdes --len; 72490267Sdes for (p = q = line; q < line + len; ++q) { 72590267Sdes if (comment && *q == '-') { 72690267Sdes if (q + 2 < line + len && 72790267Sdes strcmp(q, "-->") == 0) { 72890267Sdes tag = comment = 0; 72990267Sdes q += 2; 73090267Sdes } 73190267Sdes } else if (tag && !comment && *q == '>') { 73290267Sdes p = q + 1; 73390267Sdes tag = 0; 73490267Sdes } else if (!tag && *q == '<') { 73590267Sdes if (q > p) 73690267Sdes fwrite(p, q - p, 1, out); 73790267Sdes tag = 1; 73890267Sdes if (q + 3 < line + len && 73990267Sdes strcmp(q, "<!--") == 0) { 74090267Sdes comment = 1; 74190267Sdes q += 3; 74290267Sdes } 74390267Sdes } 74488771Sdes } 74590267Sdes if (!tag && q > p) 74690267Sdes fwrite(p, q - p, 1, out); 74790267Sdes fputc('\n', out); 74888771Sdes } 74988771Sdes} 75088771Sdes 75190267Sdes 75263012Sdes/***************************************************************************** 75363012Sdes * Core 75460954Sdes */ 75560954Sdes 75660954Sdes/* 75763012Sdes * Send a request and process the reply 75897866Sdes * 75997866Sdes * XXX This function is way too long, the do..while loop should be split 76097866Sdes * XXX off into a separate function. 76160376Sdes */ 76267043SdesFILE * 76375891Sarchie_http_request(struct url *URL, const char *op, struct url_stat *us, 76490267Sdes struct url *purl, const char *flags) 76560376Sdes{ 76697856Sdes conn_t *conn; 76790267Sdes struct url *url, *new; 76890267Sdes int chunked, direct, need_auth, noredirect, verbose; 76998422Sdes int e, i, n; 77090267Sdes off_t offset, clength, length, size; 77190267Sdes time_t mtime; 77290267Sdes const char *p; 77390267Sdes FILE *f; 77490267Sdes hdr_t h; 77590267Sdes char *host; 77660737Sume#ifdef INET6 77790267Sdes char hbuf[MAXHOSTNAMELEN + 1]; 77860737Sume#endif 77963012Sdes 78090267Sdes direct = CHECK_FLAG('d'); 78190267Sdes noredirect = CHECK_FLAG('A'); 78290267Sdes verbose = CHECK_FLAG('v'); 78360737Sume 78490267Sdes if (direct && purl) { 78590267Sdes fetchFreeURL(purl); 78690267Sdes purl = NULL; 78790267Sdes } 78863716Sdes 78990267Sdes /* try the provided URL first */ 79090267Sdes url = URL; 79163012Sdes 79290267Sdes /* if the A flag is set, we only get one try */ 79390267Sdes n = noredirect ? 1 : MAX_REDIRECT; 79490267Sdes i = 0; 79563012Sdes 79698422Sdes e = HTTP_PROTOCOL_ERROR; 79790267Sdes need_auth = 0; 79890267Sdes do { 79990267Sdes new = NULL; 80090267Sdes chunked = 0; 80190267Sdes offset = 0; 80290267Sdes clength = -1; 80390267Sdes length = -1; 80490267Sdes size = -1; 80590267Sdes mtime = 0; 80690267Sdes 80790267Sdes /* check port */ 80890267Sdes if (!url->port) 80990267Sdes url->port = _fetch_default_port(url->scheme); 81090267Sdes 81190267Sdes /* were we redirected to an FTP URL? */ 81290267Sdes if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) { 81390267Sdes if (strcmp(op, "GET") == 0) 81490267Sdes return (_ftp_request(url, "RETR", us, purl, flags)); 81590267Sdes else if (strcmp(op, "HEAD") == 0) 81690267Sdes return (_ftp_request(url, "STAT", us, purl, flags)); 81790267Sdes } 81890267Sdes 81990267Sdes /* connect to server or proxy */ 82097856Sdes if ((conn = _http_connect(url, purl, flags)) == NULL) 82190267Sdes goto ouch; 82290267Sdes 82390267Sdes host = url->host; 82460737Sume#ifdef INET6 82590267Sdes if (strchr(url->host, ':')) { 82690267Sdes snprintf(hbuf, sizeof(hbuf), "[%s]", url->host); 82790267Sdes host = hbuf; 82890267Sdes } 82960737Sume#endif 83037535Sdes 83190267Sdes /* send request */ 83290267Sdes if (verbose) 83390267Sdes _fetch_info("requesting %s://%s:%d%s", 83490267Sdes url->scheme, host, url->port, url->doc); 83590267Sdes if (purl) { 83697856Sdes _http_cmd(conn, "%s %s://%s:%d%s HTTP/1.1", 83790267Sdes op, url->scheme, host, url->port, url->doc); 83890267Sdes } else { 83997856Sdes _http_cmd(conn, "%s %s HTTP/1.1", 84090267Sdes op, url->doc); 84190267Sdes } 84237535Sdes 84390267Sdes /* virtual host */ 84490267Sdes if (url->port == _fetch_default_port(url->scheme)) 84597856Sdes _http_cmd(conn, "Host: %s", host); 84690267Sdes else 84797856Sdes _http_cmd(conn, "Host: %s:%d", host, url->port); 84890267Sdes 84990267Sdes /* proxy authorization */ 85090267Sdes if (purl) { 85190267Sdes if (*purl->user || *purl->pwd) 85297856Sdes _http_basic_auth(conn, "Proxy-Authorization", 85390267Sdes purl->user, purl->pwd); 85490267Sdes else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && *p != '\0') 85597856Sdes _http_authorize(conn, "Proxy-Authorization", p); 85690267Sdes } 85790267Sdes 85890267Sdes /* server authorization */ 85990267Sdes if (need_auth || *url->user || *url->pwd) { 86090267Sdes if (*url->user || *url->pwd) 86197856Sdes _http_basic_auth(conn, "Authorization", url->user, url->pwd); 86290267Sdes else if ((p = getenv("HTTP_AUTH")) != NULL && *p != '\0') 86397856Sdes _http_authorize(conn, "Authorization", p); 86490267Sdes else if (fetchAuthMethod && fetchAuthMethod(url) == 0) { 86597856Sdes _http_basic_auth(conn, "Authorization", url->user, url->pwd); 86690267Sdes } else { 86790267Sdes _http_seterr(HTTP_NEED_AUTH); 86890267Sdes goto ouch; 86990267Sdes } 87090267Sdes } 87190267Sdes 87290267Sdes /* other headers */ 87390267Sdes if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0') 87497856Sdes _http_cmd(conn, "User-Agent: %s", p); 87590267Sdes else 87697856Sdes _http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER, getprogname()); 87790267Sdes if (url->offset) 87897856Sdes _http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset); 87997856Sdes _http_cmd(conn, "Connection: close"); 88097856Sdes _http_cmd(conn, ""); 88190267Sdes 88290267Sdes /* get reply */ 88397856Sdes switch (_http_get_reply(conn)) { 88490267Sdes case HTTP_OK: 88590267Sdes case HTTP_PARTIAL: 88690267Sdes /* fine */ 88790267Sdes break; 88890267Sdes case HTTP_MOVED_PERM: 88990267Sdes case HTTP_MOVED_TEMP: 89090267Sdes case HTTP_SEE_OTHER: 89190267Sdes /* 89290267Sdes * Not so fine, but we still have to read the headers to 89390267Sdes * get the new location. 89490267Sdes */ 89590267Sdes break; 89690267Sdes case HTTP_NEED_AUTH: 89790267Sdes if (need_auth) { 89890267Sdes /* 89990267Sdes * We already sent out authorization code, so there's 90090267Sdes * nothing more we can do. 90190267Sdes */ 90297856Sdes _http_seterr(conn->err); 90390267Sdes goto ouch; 90490267Sdes } 90590267Sdes /* try again, but send the password this time */ 90690267Sdes if (verbose) 90790267Sdes _fetch_info("server requires authorization"); 90890267Sdes break; 90990267Sdes case HTTP_NEED_PROXY_AUTH: 91090267Sdes /* 91190267Sdes * If we're talking to a proxy, we already sent our proxy 91290267Sdes * authorization code, so there's nothing more we can do. 91390267Sdes */ 91497856Sdes _http_seterr(conn->err); 91590267Sdes goto ouch; 91690267Sdes case HTTP_PROTOCOL_ERROR: 91790267Sdes /* fall through */ 91890267Sdes case -1: 91990267Sdes _fetch_syserr(); 92090267Sdes goto ouch; 92190267Sdes default: 92297856Sdes _http_seterr(conn->err); 92390267Sdes if (!verbose) 92490267Sdes goto ouch; 92590267Sdes /* fall through so we can get the full error message */ 92690267Sdes } 92790267Sdes 92890267Sdes /* get headers */ 92990267Sdes do { 93097856Sdes switch ((h = _http_next_header(conn, &p))) { 93190267Sdes case hdr_syserror: 93290267Sdes _fetch_syserr(); 93390267Sdes goto ouch; 93490267Sdes case hdr_error: 93590267Sdes _http_seterr(HTTP_PROTOCOL_ERROR); 93690267Sdes goto ouch; 93790267Sdes case hdr_content_length: 93890267Sdes _http_parse_length(p, &clength); 93990267Sdes break; 94090267Sdes case hdr_content_range: 94190267Sdes _http_parse_range(p, &offset, &length, &size); 94290267Sdes break; 94390267Sdes case hdr_last_modified: 94490267Sdes _http_parse_mtime(p, &mtime); 94590267Sdes break; 94690267Sdes case hdr_location: 94797856Sdes if (!HTTP_REDIRECT(conn->err)) 94890267Sdes break; 94990267Sdes if (new) 95090267Sdes free(new); 95190267Sdes if (verbose) 95297856Sdes _fetch_info("%d redirect to %s", conn->err, p); 95390267Sdes if (*p == '/') 95490267Sdes /* absolute path */ 95590267Sdes new = fetchMakeURL(url->scheme, url->host, url->port, p, 95690267Sdes url->user, url->pwd); 95790267Sdes else 95890267Sdes new = fetchParseURL(p); 95990267Sdes if (new == NULL) { 96090267Sdes /* XXX should set an error code */ 96190267Sdes DEBUG(fprintf(stderr, "failed to parse new URL\n")); 96290267Sdes goto ouch; 96390267Sdes } 96490267Sdes if (!*new->user && !*new->pwd) { 96590267Sdes strcpy(new->user, url->user); 96690267Sdes strcpy(new->pwd, url->pwd); 96790267Sdes } 96890267Sdes new->offset = url->offset; 96990267Sdes new->length = url->length; 97090267Sdes break; 97190267Sdes case hdr_transfer_encoding: 97290267Sdes /* XXX weak test*/ 97390267Sdes chunked = (strcasecmp(p, "chunked") == 0); 97490267Sdes break; 97590267Sdes case hdr_www_authenticate: 97697856Sdes if (conn->err != HTTP_NEED_AUTH) 97790267Sdes break; 97890267Sdes /* if we were smarter, we'd check the method and realm */ 97990267Sdes break; 98090267Sdes case hdr_end: 98190267Sdes /* fall through */ 98290267Sdes case hdr_unknown: 98390267Sdes /* ignore */ 98490267Sdes break; 98590267Sdes } 98690267Sdes } while (h > hdr_end); 98790267Sdes 98890267Sdes /* we need to provide authentication */ 98997856Sdes if (conn->err == HTTP_NEED_AUTH) { 99098422Sdes e = conn->err; 99190267Sdes need_auth = 1; 99297856Sdes _fetch_close(conn); 99397856Sdes conn = NULL; 99490267Sdes continue; 99590267Sdes } 99690267Sdes 997104404Sru /* we have a hit or an error */ 998104404Sru if (conn->err == HTTP_OK || conn->err == HTTP_PARTIAL || HTTP_ERROR(conn->err)) 999104404Sru break; 1000104404Sru 100190267Sdes /* all other cases: we got a redirect */ 100298422Sdes e = conn->err; 100390267Sdes need_auth = 0; 100497856Sdes _fetch_close(conn); 100597856Sdes conn = NULL; 100690267Sdes if (!new) { 100790267Sdes DEBUG(fprintf(stderr, "redirect with no new location\n")); 100890267Sdes break; 100990267Sdes } 101090267Sdes if (url != URL) 101190267Sdes fetchFreeURL(url); 101290267Sdes url = new; 101390267Sdes } while (++i < n); 101490267Sdes 101590267Sdes /* we failed, or ran out of retries */ 101697856Sdes if (conn == NULL) { 101798422Sdes _http_seterr(e); 101863012Sdes goto ouch; 101963012Sdes } 102060376Sdes 102190267Sdes DEBUG(fprintf(stderr, "offset %lld, length %lld," 102290267Sdes " size %lld, clength %lld\n", 102390267Sdes (long long)offset, (long long)length, 102490267Sdes (long long)size, (long long)clength)); 102560376Sdes 102690267Sdes /* check for inconsistencies */ 102790267Sdes if (clength != -1 && length != -1 && clength != length) { 102890267Sdes _http_seterr(HTTP_PROTOCOL_ERROR); 102963012Sdes goto ouch; 103063012Sdes } 103190267Sdes if (clength == -1) 103290267Sdes clength = length; 103390267Sdes if (clength != -1) 103490267Sdes length = offset + clength; 103590267Sdes if (length != -1 && size != -1 && length != size) { 103663012Sdes _http_seterr(HTTP_PROTOCOL_ERROR); 103763012Sdes goto ouch; 103890267Sdes } 103990267Sdes if (size == -1) 104090267Sdes size = length; 104160376Sdes 104290267Sdes /* fill in stats */ 104390267Sdes if (us) { 104490267Sdes us->size = size; 104590267Sdes us->atime = us->mtime = mtime; 104690267Sdes } 104763069Sdes 104890267Sdes /* too far? */ 104990267Sdes if (offset > URL->offset) { 105090267Sdes _http_seterr(HTTP_PROTOCOL_ERROR); 105190267Sdes goto ouch; 105277238Sdes } 105360376Sdes 105490267Sdes /* report back real offset and size */ 105590267Sdes URL->offset = offset; 105690267Sdes URL->length = clength; 105737535Sdes 105890267Sdes /* wrap it up in a FILE */ 105997866Sdes if ((f = _http_funopen(conn, chunked)) == NULL) { 106090267Sdes _fetch_syserr(); 106190267Sdes goto ouch; 106290267Sdes } 106363716Sdes 106490267Sdes if (url != URL) 106590267Sdes fetchFreeURL(url); 106690267Sdes if (purl) 106790267Sdes fetchFreeURL(purl); 106863567Sdes 106997856Sdes if (HTTP_ERROR(conn->err)) { 107090267Sdes _http_print_html(stderr, f); 107190267Sdes fclose(f); 107290267Sdes f = NULL; 107390267Sdes } 107463012Sdes 107590267Sdes return (f); 107688771Sdes 107790267Sdesouch: 107890267Sdes if (url != URL) 107990267Sdes fetchFreeURL(url); 108090267Sdes if (purl) 108190267Sdes fetchFreeURL(purl); 108297856Sdes if (conn != NULL) 108397856Sdes _fetch_close(conn); 108490267Sdes return (NULL); 108563012Sdes} 108660189Sdes 108790267Sdes 108863012Sdes/***************************************************************************** 108963012Sdes * Entry points 109063012Sdes */ 109163012Sdes 109263012Sdes/* 109363340Sdes * Retrieve and stat a file by HTTP 109463340Sdes */ 109563340SdesFILE * 109675891SarchiefetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags) 109763340Sdes{ 109890267Sdes return (_http_request(URL, "GET", us, _http_get_proxy(), flags)); 109963340Sdes} 110063340Sdes 110163340Sdes/* 110263012Sdes * Retrieve a file by HTTP 110363012Sdes */ 110463012SdesFILE * 110575891SarchiefetchGetHTTP(struct url *URL, const char *flags) 110663012Sdes{ 110790267Sdes return (fetchXGetHTTP(URL, NULL, flags)); 110837535Sdes} 110937535Sdes 111063340Sdes/* 111163340Sdes * Store a file by HTTP 111263340Sdes */ 111337535SdesFILE * 111485093SdesfetchPutHTTP(struct url *URL __unused, const char *flags __unused) 111537535Sdes{ 111690267Sdes warnx("fetchPutHTTP(): not implemented"); 111790267Sdes return (NULL); 111837535Sdes} 111940975Sdes 112040975Sdes/* 112140975Sdes * Get an HTTP document's metadata 112240975Sdes */ 112340975Sdesint 112475891SarchiefetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags) 112540975Sdes{ 112690267Sdes FILE *f; 112790267Sdes 112890267Sdes if ((f = _http_request(URL, "HEAD", us, _http_get_proxy(), flags)) == NULL) 112990267Sdes return (-1); 113090267Sdes fclose(f); 113190267Sdes return (0); 113240975Sdes} 113341989Sdes 113441989Sdes/* 113541989Sdes * List a directory 113641989Sdes */ 113741989Sdesstruct url_ent * 113885093SdesfetchListHTTP(struct url *url __unused, const char *flags __unused) 113941989Sdes{ 114090267Sdes warnx("fetchListHTTP(): not implemented"); 114190267Sdes return (NULL); 114241989Sdes} 1143