http.c revision 63069
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 * 2863012Sdes * $FreeBSD: head/lib/libfetch/http.c 63069 2000-07-13 09:13:58Z des $ 2937535Sdes */ 3037535Sdes 3137535Sdes#include <sys/param.h> 3260737Sume#include <sys/socket.h> 3337535Sdes 3463012Sdes#include <ctype.h> 3537535Sdes#include <err.h> 3663012Sdes#include <errno.h> 3760376Sdes#include <locale.h> 3860189Sdes#include <netdb.h> 3937608Sdes#include <stdarg.h> 4037535Sdes#include <stdio.h> 4137535Sdes#include <stdlib.h> 4237535Sdes#include <string.h> 4360376Sdes#include <time.h> 4437535Sdes#include <unistd.h> 4537535Sdes 4637535Sdes#include "fetch.h" 4740939Sdes#include "common.h" 4841862Sdes#include "httperr.h" 4937535Sdes 5063012Sdesextern char *__progname; /* XXX not portable */ 5137535Sdes 5263012Sdes/* Maximum number of redirects to follow */ 5363012Sdes#define MAX_REDIRECT 5 5437535Sdes 5563012Sdes/* Symbolic names for reply codes we care about */ 5663012Sdes#define HTTP_OK 200 5763012Sdes#define HTTP_PARTIAL 206 5863012Sdes#define HTTP_MOVED_PERM 301 5963012Sdes#define HTTP_MOVED_TEMP 302 6063012Sdes#define HTTP_SEE_OTHER 303 6163012Sdes#define HTTP_NEED_AUTH 401 6263012Sdes#define HTTP_NEED_PROXY_AUTH 403 6363012Sdes#define HTTP_PROTOCOL_ERROR 999 6460196Sdes 6563012Sdes#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \ 6663012Sdes || (xyz) == HTTP_MOVED_TEMP \ 6763012Sdes || (xyz) == HTTP_SEE_OTHER) 6863012Sdes 6963012Sdes 7063012Sdes 7163012Sdes/***************************************************************************** 7263012Sdes * I/O functions for decoding chunked streams 7363012Sdes */ 7463012Sdes 7537535Sdesstruct cookie 7637535Sdes{ 7763012Sdes int fd; 7863012Sdes char *buf; 7963012Sdes size_t b_size; 8063012Sdes size_t b_len; 8163012Sdes int b_pos; 8263012Sdes int eof; 8363012Sdes int error; 8463012Sdes long chunksize; 8563012Sdes#ifdef DEBUG 8663012Sdes long total; 8763012Sdes#endif 8837535Sdes}; 8937535Sdes 9037608Sdes/* 9163012Sdes * Get next chunk header 9237608Sdes */ 9337608Sdesstatic int 9463012Sdes_http_new_chunk(struct cookie *c) 9537608Sdes{ 9663012Sdes char *p; 9737608Sdes 9863012Sdes if (_fetch_getln(c->fd, &c->buf, &c->b_size, &c->b_len) == -1) 9963012Sdes return -1; 10063012Sdes 10163012Sdes if (c->b_len < 2 || !ishexnumber(*c->buf)) 10263012Sdes return -1; 10363012Sdes 10463012Sdes for (p = c->buf; !isspace(*p) && *p != ';' && p < c->buf + c->b_len; ++p) 10563012Sdes if (!ishexnumber(*p)) 10663012Sdes return -1; 10763012Sdes else if (isdigit(*p)) 10863012Sdes c->chunksize = c->chunksize * 16 + *p - '0'; 10963012Sdes else 11063012Sdes c->chunksize = c->chunksize * 16 + 10 + tolower(*p) - 'a'; 11163012Sdes 11263012Sdes#ifdef DEBUG 11363012Sdes c->total += c->chunksize; 11463012Sdes if (c->chunksize == 0) 11563012Sdes fprintf(stderr, "\033[1m_http_fillbuf(): " 11663012Sdes "end of last chunk\033[m\n"); 11763012Sdes else 11863012Sdes fprintf(stderr, "\033[1m_http_fillbuf(): " 11963012Sdes "new chunk: %ld (%ld)\033[m\n", c->chunksize, c->total); 12063012Sdes#endif 12163012Sdes 12263012Sdes return c->chunksize; 12337608Sdes} 12437608Sdes 12537608Sdes/* 12637608Sdes * Fill the input buffer, do chunk decoding on the fly 12737608Sdes */ 12863012Sdesstatic int 12937535Sdes_http_fillbuf(struct cookie *c) 13037535Sdes{ 13163012Sdes if (c->error) 13263012Sdes return -1; 13337535Sdes if (c->eof) 13463012Sdes return 0; 13563012Sdes 13663012Sdes if (c->chunksize == 0) { 13763012Sdes switch (_http_new_chunk(c)) { 13863012Sdes case -1: 13963012Sdes c->error = 1; 14063012Sdes return -1; 14163012Sdes case 0: 14263012Sdes c->eof = 1; 14363012Sdes return 0; 14437535Sdes } 14537535Sdes } 14663012Sdes 14763012Sdes if (c->b_size < c->chunksize) { 14863012Sdes char *tmp; 14963012Sdes 15063012Sdes if ((tmp = realloc(c->buf, c->chunksize)) == NULL) 15163012Sdes return -1; 15263012Sdes c->buf = tmp; 15363012Sdes c->b_size = c->chunksize; 15463012Sdes } 15563012Sdes 15663012Sdes if ((c->b_len = read(c->fd, c->buf, c->chunksize)) == -1) 15763012Sdes return -1; 15863012Sdes c->chunksize -= c->b_len; 15963012Sdes 16063012Sdes if (c->chunksize == 0) { 16163012Sdes char endl[2]; 16263012Sdes read(c->fd, endl, 2); 16363012Sdes } 16463012Sdes 16563012Sdes c->b_pos = 0; 16663012Sdes 16763012Sdes return c->b_len; 16837535Sdes} 16937535Sdes 17037608Sdes/* 17137608Sdes * Read function 17237608Sdes */ 17337535Sdesstatic int 17463012Sdes_http_readfn(void *v, char *buf, int len) 17537535Sdes{ 17663012Sdes struct cookie *c = (struct cookie *)v; 17763012Sdes int l, pos; 17863012Sdes 17963012Sdes if (c->error) 18063012Sdes return -1; 18163012Sdes if (c->eof) 18263012Sdes return 0; 18363012Sdes 18463012Sdes for (pos = 0; len > 0; pos += l, len -= l) { 18537535Sdes /* empty buffer */ 18663012Sdes if (!c->buf || c->b_pos == c->b_len) 18763012Sdes if (_http_fillbuf(c) < 1) 18837535Sdes break; 18963012Sdes l = c->b_len - c->b_pos; 19063012Sdes if (len < l) 19163012Sdes l = len; 19263012Sdes bcopy(c->buf + c->b_pos, buf + pos, l); 19363012Sdes c->b_pos += l; 19463012Sdes } 19537535Sdes 19663012Sdes if (!pos && c->error) 19737535Sdes return -1; 19863012Sdes return pos; 19937535Sdes} 20037535Sdes 20137608Sdes/* 20237608Sdes * Write function 20337608Sdes */ 20437535Sdesstatic int 20563012Sdes_http_writefn(void *v, const char *buf, int len) 20637535Sdes{ 20763012Sdes struct cookie *c = (struct cookie *)v; 20863012Sdes 20963012Sdes return write(c->fd, buf, len); 21037535Sdes} 21137535Sdes 21237608Sdes/* 21337608Sdes * Close function 21437608Sdes */ 21537535Sdesstatic int 21663012Sdes_http_closefn(void *v) 21737535Sdes{ 21863012Sdes struct cookie *c = (struct cookie *)v; 21963012Sdes int r; 22063012Sdes 22163012Sdes r = close(c->fd); 22263012Sdes if (c->buf) 22363012Sdes free(c->buf); 22437535Sdes free(c); 22563012Sdes return r; 22637535Sdes} 22737535Sdes 22837608Sdes/* 22963012Sdes * Wrap a file descriptor up 23037608Sdes */ 23163012Sdesstatic FILE * 23263012Sdes_http_funopen(int fd) 23337535Sdes{ 23463012Sdes struct cookie *c; 23563012Sdes FILE *f; 23663012Sdes 23763012Sdes if ((c = calloc(1, sizeof *c)) == NULL) { 23863012Sdes _fetch_syserr(); 23963012Sdes return NULL; 24063012Sdes } 24163012Sdes c->fd = fd; 24263012Sdes if (!(f = funopen(c, _http_readfn, _http_writefn, NULL, _http_closefn))) { 24363012Sdes _fetch_syserr(); 24463012Sdes free(c); 24563012Sdes return NULL; 24663012Sdes } 24763012Sdes return f; 24863012Sdes} 24963012Sdes 25063012Sdes 25163012Sdes/***************************************************************************** 25263012Sdes * Helper functions for talking to the server and parsing its replies 25363012Sdes */ 25463012Sdes 25563012Sdes/* Header types */ 25663012Sdestypedef enum { 25763012Sdes hdr_syserror = -2, 25863012Sdes hdr_error = -1, 25963012Sdes hdr_end = 0, 26063012Sdes hdr_unknown = 1, 26163012Sdes hdr_content_length, 26263012Sdes hdr_content_range, 26363012Sdes hdr_last_modified, 26463012Sdes hdr_location, 26563012Sdes hdr_transfer_encoding 26663012Sdes} hdr; 26763012Sdes 26863012Sdes/* Names of interesting headers */ 26963012Sdesstatic struct { 27063012Sdes hdr num; 27163012Sdes char *name; 27263012Sdes} hdr_names[] = { 27363012Sdes { hdr_content_length, "Content-Length" }, 27463012Sdes { hdr_content_range, "Content-Range" }, 27563012Sdes { hdr_last_modified, "Last-Modified" }, 27663012Sdes { hdr_location, "Location" }, 27763012Sdes { hdr_transfer_encoding, "Transfer-Encoding" }, 27863012Sdes { hdr_unknown, NULL }, 27963012Sdes}; 28063012Sdes 28163012Sdesstatic char *reply_buf; 28263012Sdesstatic size_t reply_size; 28363012Sdesstatic size_t reply_length; 28463012Sdes 28563012Sdes/* 28663012Sdes * Send a formatted line; optionally echo to terminal 28763012Sdes */ 28863012Sdesstatic int 28963012Sdes_http_cmd(int fd, char *fmt, ...) 29063012Sdes{ 29163012Sdes va_list ap; 29263012Sdes size_t len; 29363012Sdes char *msg; 29463012Sdes int r; 29563012Sdes 29663012Sdes va_start(ap, fmt); 29763012Sdes len = vasprintf(&msg, fmt, ap); 29863012Sdes va_end(ap); 29963012Sdes 30063012Sdes if (msg == NULL) { 30163012Sdes errno = ENOMEM; 30263012Sdes _fetch_syserr(); 30363012Sdes return -1; 30463012Sdes } 30563012Sdes 30663012Sdes r = _fetch_putln(fd, msg, len); 30763012Sdes free(msg); 30863012Sdes 30963012Sdes if (r == -1) { 31063012Sdes _fetch_syserr(); 31163012Sdes return -1; 31263012Sdes } 31363012Sdes 31463012Sdes return 0; 31563012Sdes} 31663012Sdes 31763012Sdes/* 31863012Sdes * Get and parse status line 31963012Sdes */ 32063012Sdesstatic int 32163012Sdes_http_get_reply(int fd) 32263012Sdes{ 32363012Sdes if (_fetch_getln(fd, &reply_buf, &reply_size, &reply_length) == -1) 32463012Sdes return -1; 32537535Sdes /* 32663012Sdes * A valid status line looks like "HTTP/m.n xyz reason" where m 32763012Sdes * and n are the major and minor protocol version numbers and xyz 32863012Sdes * is the reply code. 32963012Sdes * We grok HTTP 1.0 and 1.1, so m must be 1 and n must be 0 or 1. 33063012Sdes * We don't care about the reason phrase. 33137535Sdes */ 33263012Sdes if (strncmp(reply_buf, "HTTP/1.", 7) != 0 33363012Sdes || (reply_buf[7] != '0' && reply_buf[7] != '1') || reply_buf[8] != ' ' 33463012Sdes || !isdigit(reply_buf[9]) 33563012Sdes || !isdigit(reply_buf[10]) 33663012Sdes || !isdigit(reply_buf[11])) 33763012Sdes return HTTP_PROTOCOL_ERROR; 33863012Sdes 33963012Sdes return ((reply_buf[9] - '0') * 100 34063012Sdes + (reply_buf[10] - '0') * 10 34163012Sdes + (reply_buf[11] - '0')); 34237535Sdes} 34337535Sdes 34437608Sdes/* 34563012Sdes * Check a header; if the type matches the given string, return a 34663012Sdes * pointer to the beginning of the value. 34763012Sdes */ 34863012Sdesstatic char * 34963012Sdes_http_match(char *str, char *hdr) 35063012Sdes{ 35163012Sdes while (*str && *hdr && tolower(*str++) == tolower(*hdr++)) 35263012Sdes /* nothing */; 35363012Sdes if (*str || *hdr != ':') 35463012Sdes return NULL; 35563012Sdes while (*hdr && isspace(*++hdr)) 35663012Sdes /* nothing */; 35763012Sdes return hdr; 35863012Sdes} 35963012Sdes 36063012Sdes/* 36163012Sdes * Get the next header and return the appropriate symbolic code. 36263012Sdes */ 36363012Sdesstatic hdr 36463012Sdes_http_next_header(int fd, char **p) 36563012Sdes{ 36663012Sdes int i; 36763012Sdes 36863012Sdes if (_fetch_getln(fd, &reply_buf, &reply_size, &reply_length) == -1) 36963012Sdes return hdr_syserror; 37063012Sdes while (reply_length && isspace(reply_buf[reply_length-1])) 37163012Sdes reply_length--; 37263012Sdes reply_buf[reply_length] = 0; 37363012Sdes if (reply_length == 0) 37463012Sdes return hdr_end; 37563012Sdes /* 37663012Sdes * We could check for malformed headers but we don't really care. 37763012Sdes * A valid header starts with a token immediately followed by a 37863012Sdes * colon; a token is any sequence of non-control, non-whitespace 37963012Sdes * characters except "()<>@,;:\\\"{}". 38063012Sdes */ 38163012Sdes for (i = 0; hdr_names[i].num != hdr_unknown; i++) 38263012Sdes if ((*p = _http_match(hdr_names[i].name, reply_buf)) != NULL) 38363012Sdes return hdr_names[i].num; 38463012Sdes return hdr_unknown; 38563012Sdes} 38663012Sdes 38763012Sdes/* 38863012Sdes * Parse a last-modified header 38963012Sdes */ 39063012Sdesstatic time_t 39163012Sdes_http_parse_mtime(char *p) 39263012Sdes{ 39363012Sdes char locale[64]; 39463012Sdes struct tm tm; 39563012Sdes 39663012Sdes strncpy(locale, setlocale(LC_TIME, NULL), sizeof locale); 39763012Sdes setlocale(LC_TIME, "C"); 39863012Sdes strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); 39963012Sdes /* XXX should add support for date-2 and date-3 */ 40063012Sdes setlocale(LC_TIME, locale); 40163012Sdes DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d " 40263012Sdes "%02d:%02d:%02d\033[m]\n", 40363012Sdes tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 40463012Sdes tm.tm_hour, tm.tm_min, tm.tm_sec)); 40563012Sdes return timegm(&tm); 40663012Sdes} 40763012Sdes 40863012Sdes/* 40963012Sdes * Parse a content-length header 41063012Sdes */ 41163012Sdesstatic off_t 41263012Sdes_http_parse_length(char *p) 41363012Sdes{ 41463012Sdes off_t len; 41563012Sdes 41663012Sdes for (len = 0; *p && isdigit(*p); ++p) 41763012Sdes len = len * 10 + (*p - '0'); 41863012Sdes DEBUG(fprintf(stderr, "content length: [\033[1m%lld\033[m]\n", len)); 41963012Sdes return len; 42063012Sdes} 42163012Sdes 42263012Sdes/* 42363012Sdes * Parse a content-range header 42463012Sdes */ 42563012Sdesstatic off_t 42663012Sdes_http_parse_range(char *p) 42763012Sdes{ 42863012Sdes off_t off; 42963012Sdes 43063012Sdes if (strncasecmp(p, "bytes ", 6) != 0) 43163012Sdes return -1; 43263012Sdes for (p += 6, off = 0; *p && isdigit(*p); ++p) 43363012Sdes off = off * 10 + *p - '0'; 43463012Sdes if (*p != '-') 43563012Sdes return -1; 43663012Sdes DEBUG(fprintf(stderr, "content range: [\033[1m%lld-\033[m]\n", off)); 43763012Sdes return off; 43863012Sdes} 43963012Sdes 44063012Sdes 44163012Sdes/***************************************************************************** 44263012Sdes * Helper functions for authorization 44363012Sdes */ 44463012Sdes 44563012Sdes/* 44637608Sdes * Base64 encoding 44737608Sdes */ 44862965Sdesstatic char * 44962965Sdes_http_base64(char *src) 45037608Sdes{ 45137608Sdes static const char base64[] = 45237608Sdes "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 45337608Sdes "abcdefghijklmnopqrstuvwxyz" 45437608Sdes "0123456789+/"; 45562965Sdes char *str, *dst; 45662965Sdes size_t l; 45762965Sdes int t, r; 45862965Sdes 45962965Sdes l = strlen(src); 46062965Sdes if ((str = malloc(((l + 2) / 3) * 4)) == NULL) 46162965Sdes return NULL; 46262965Sdes dst = str; 46362965Sdes r = 0; 46437608Sdes 46537608Sdes while (l >= 3) { 46637608Sdes t = (src[0] << 16) | (src[1] << 8) | src[2]; 46737608Sdes dst[0] = base64[(t >> 18) & 0x3f]; 46837608Sdes dst[1] = base64[(t >> 12) & 0x3f]; 46937608Sdes dst[2] = base64[(t >> 6) & 0x3f]; 47037608Sdes dst[3] = base64[(t >> 0) & 0x3f]; 47137608Sdes src += 3; l -= 3; 47237608Sdes dst += 4; r += 4; 47337608Sdes } 47437608Sdes 47537608Sdes switch (l) { 47637608Sdes case 2: 47737608Sdes t = (src[0] << 16) | (src[1] << 8); 47837608Sdes dst[0] = base64[(t >> 18) & 0x3f]; 47937608Sdes dst[1] = base64[(t >> 12) & 0x3f]; 48037608Sdes dst[2] = base64[(t >> 6) & 0x3f]; 48137608Sdes dst[3] = '='; 48237608Sdes dst += 4; 48337608Sdes r += 4; 48437608Sdes break; 48537608Sdes case 1: 48637608Sdes t = src[0] << 16; 48737608Sdes dst[0] = base64[(t >> 18) & 0x3f]; 48837608Sdes dst[1] = base64[(t >> 12) & 0x3f]; 48937608Sdes dst[2] = dst[3] = '='; 49037608Sdes dst += 4; 49137608Sdes r += 4; 49237608Sdes break; 49337608Sdes case 0: 49437608Sdes break; 49537608Sdes } 49637608Sdes 49737608Sdes *dst = 0; 49862965Sdes return str; 49937608Sdes} 50037608Sdes 50137608Sdes/* 50237608Sdes * Encode username and password 50337608Sdes */ 50462965Sdesstatic int 50563012Sdes_http_basic_auth(int fd, char *hdr, char *usr, char *pwd) 50637608Sdes{ 50762965Sdes char *upw, *auth; 50862965Sdes int r; 50937608Sdes 51062965Sdes if (asprintf(&upw, "%s:%s", usr, pwd) == -1) 51162965Sdes return -1; 51262965Sdes auth = _http_base64(upw); 51362965Sdes free(upw); 51462965Sdes if (auth == NULL) 51562965Sdes return -1; 51663012Sdes r = _http_cmd(fd, "%s: Basic %s", hdr, auth); 51762965Sdes free(auth); 51862965Sdes return r; 51962965Sdes} 52062965Sdes 52162965Sdes/* 52262965Sdes * Send an authorization header 52362965Sdes */ 52462965Sdesstatic int 52563012Sdes_http_authorize(int fd, char *hdr, char *p) 52662965Sdes{ 52762965Sdes /* basic authorization */ 52862965Sdes if (strncasecmp(p, "basic:", 6) == 0) { 52962965Sdes char *user, *pwd, *str; 53062965Sdes int r; 53162965Sdes 53262965Sdes /* skip realm */ 53362965Sdes for (p += 6; *p && *p != ':'; ++p) 53462965Sdes /* nothing */ ; 53562965Sdes if (!*p || strchr(++p, ':') == NULL) 53662965Sdes return -1; 53762965Sdes if ((str = strdup(p)) == NULL) 53862965Sdes return -1; /* XXX */ 53962965Sdes user = str; 54062965Sdes pwd = strchr(str, ':'); 54162965Sdes *pwd++ = '\0'; 54263012Sdes r = _http_basic_auth(fd, hdr, user, pwd); 54362965Sdes free(str); 54462965Sdes return r; 54562811Sdes } 54662965Sdes return -1; 54737608Sdes} 54837608Sdes 54963012Sdes 55063012Sdes/***************************************************************************** 55163012Sdes * Helper functions for connecting to a server or proxy 55263012Sdes */ 55363012Sdes 55437608Sdes/* 55563012Sdes * Connect to the specified HTTP proxy server. 55637608Sdes */ 55763012Sdesstatic int 55863012Sdes_http_proxy_connect(char *proxy, int af, int verbose) 55937535Sdes{ 56063012Sdes char *hostname, *p; 56163012Sdes int fd, port; 56263012Sdes 56363012Sdes /* get hostname */ 56463012Sdes hostname = NULL; 56560737Sume#ifdef INET6 56663012Sdes /* host part can be an IPv6 address enclosed in square brackets */ 56763012Sdes if (*proxy == '[') { 56863012Sdes if ((p = strchr(proxy, ']')) == NULL) { 56963012Sdes /* no terminating bracket */ 57063012Sdes /* XXX should set an error code */ 57163012Sdes goto ouch; 57263012Sdes } 57363012Sdes if (p[1] != '\0' && p[1] != ':') { 57463012Sdes /* garbage after address */ 57563012Sdes /* XXX should set an error code */ 57663012Sdes goto ouch; 57763012Sdes } 57863012Sdes if ((hostname = malloc(p - proxy)) == NULL) { 57963012Sdes errno = ENOMEM; 58063012Sdes _fetch_syserr(); 58163012Sdes goto ouch; 58263012Sdes } 58363012Sdes strncpy(hostname, proxy + 1, p - proxy - 1); 58463012Sdes hostname[p - proxy - 1] = '\0'; 58563012Sdes ++p; 58663012Sdes } else { 58763012Sdes#endif /* INET6 */ 58863012Sdes if ((p = strchr(proxy, ':')) == NULL) 58963012Sdes p = strchr(proxy, '\0'); 59063012Sdes if ((hostname = malloc(p - proxy + 1)) == NULL) { 59163012Sdes errno = ENOMEM; 59263012Sdes _fetch_syserr(); 59363012Sdes goto ouch; 59463012Sdes } 59563012Sdes strncpy(hostname, proxy, p - proxy); 59663012Sdes hostname[p - proxy] = '\0'; 59763012Sdes#ifdef INET6 59863012Sdes } 59963012Sdes#endif /* INET6 */ 60063012Sdes DEBUG(fprintf(stderr, "proxy name: [%s]\n", hostname)); 60163012Sdes 60263012Sdes /* get port number */ 60363012Sdes port = 0; 60463012Sdes if (*p == ':') { 60563012Sdes ++p; 60663012Sdes if (strspn(p, "0123456789") != strlen(p) || strlen(p) > 5) { 60763012Sdes /* port number is non-numeric or too long */ 60863012Sdes /* XXX should set an error code */ 60963012Sdes goto ouch; 61063012Sdes } 61163012Sdes port = atoi(p); 61263012Sdes if (port < 1 || port > 65535) { 61363012Sdes /* port number is out of range */ 61463012Sdes /* XXX should set an error code */ 61563012Sdes goto ouch; 61663012Sdes } 61763012Sdes } 61863012Sdes 61963012Sdes if (!port) { 62063012Sdes#if 0 62163012Sdes /* 62263012Sdes * commented out, since there is currently no service name 62363012Sdes * for HTTP proxies 62463012Sdes */ 62563012Sdes struct servent *se; 62663012Sdes 62763012Sdes if ((se = getservbyname("xxxx", "tcp")) != NULL) 62863012Sdes port = ntohs(se->s_port); 62963012Sdes else 63063012Sdes#endif 63163012Sdes port = 3128; 63263012Sdes } 63363012Sdes DEBUG(fprintf(stderr, "proxy port: %d\n", port)); 63463012Sdes 63563012Sdes /* connect */ 63663012Sdes if ((fd = _fetch_connect(hostname, port, af, verbose)) == -1) 63763012Sdes _fetch_syserr(); 63863012Sdes return fd; 63963012Sdes 64063012Sdes ouch: 64163012Sdes if (hostname) 64263012Sdes free(hostname); 64363012Sdes return -1; 64463012Sdes} 64563012Sdes 64663012Sdes/* 64763012Sdes * Connect to the correct HTTP server or proxy. 64863012Sdes */ 64963012Sdesstatic int 65063012Sdes_http_connect(struct url *URL, int *proxy, char *flags) 65163012Sdes{ 65263012Sdes int direct, verbose; 65363012Sdes int af, fd; 65463012Sdes char *p; 65563012Sdes 65663012Sdes#ifdef INET6 65763012Sdes af = AF_UNSPEC; 65860737Sume#else 65963012Sdes af = AF_INET; 66060737Sume#endif 66163012Sdes 66255544Sdes direct = (flags && strchr(flags, 'd')); 66355544Sdes verbose = (flags && strchr(flags, 'v')); 66463012Sdes if (flags && strchr(flags, '4')) 66560737Sume af = AF_INET; 66663012Sdes else if (flags && strchr(flags, '6')) 66760737Sume af = AF_INET6; 66841862Sdes 66937535Sdes /* check port */ 67060189Sdes if (!URL->port) { 67160189Sdes struct servent *se; 67260189Sdes 67363012Sdes /* Scheme can be ftp if we're using a proxy */ 67460587Sume if (strcasecmp(URL->scheme, "ftp") == 0) 67560587Sume if ((se = getservbyname("ftp", "tcp")) != NULL) 67660587Sume URL->port = ntohs(se->s_port); 67760587Sume else 67860587Sume URL->port = 21; 67960189Sdes else 68060587Sume if ((se = getservbyname("http", "tcp")) != NULL) 68160587Sume URL->port = ntohs(se->s_port); 68260587Sume else 68360587Sume URL->port = 80; 68460189Sdes } 68537535Sdes 68663012Sdes if (!direct && (p = getenv("HTTP_PROXY")) != NULL) { 68763012Sdes /* attempt to connect to proxy server */ 68863012Sdes if ((fd = _http_proxy_connect(p, af, verbose)) == -1) 68963012Sdes return -1; 69063012Sdes *proxy = 1; 69163012Sdes } else { 69263012Sdes /* if no proxy is configured, try direct */ 69363012Sdes if (strcasecmp(URL->scheme, "ftp") == 0) { 69463012Sdes /* can't talk http to an ftp server */ 69563012Sdes /* XXX should set an error code */ 69663012Sdes return -1; 69760189Sdes } 69863012Sdes if ((fd = _fetch_connect(URL->host, URL->port, af, verbose)) == -1) 69963012Sdes /* _fetch_connect() has already set an error code */ 70063012Sdes return -1; 70163012Sdes *proxy = 0; 70237535Sdes } 70337535Sdes 70463012Sdes return fd; 70560376Sdes} 70660376Sdes 70763012Sdes 70863012Sdes/***************************************************************************** 70963012Sdes * Core 71060954Sdes */ 71160954Sdes 71260954Sdes/* 71363012Sdes * Send a request and process the reply 71460376Sdes */ 71563012Sdesstatic FILE * 71663012Sdes_http_request(struct url *URL, char *op, struct url_stat *us, char *flags) 71760376Sdes{ 71863012Sdes struct url *url, *new; 71963012Sdes int chunked, need_auth, noredirect, proxy, verbose; 72063012Sdes int code, fd, i, n; 72163012Sdes off_t offset; 72263012Sdes char *p; 72363012Sdes FILE *f; 72463012Sdes hdr h; 72560737Sume char *host; 72660737Sume#ifdef INET6 72760737Sume char hbuf[MAXHOSTNAMELEN + 1]; 72860737Sume#endif 72963012Sdes 73063012Sdes noredirect = (flags && strchr(flags, 'A')); 73160376Sdes verbose = (flags && strchr(flags, 'v')); 73260737Sume 73363012Sdes n = noredirect ? 1 : MAX_REDIRECT; 73463012Sdes 73563069Sdes /* just to appease compiler warnings */ 73663069Sdes code = HTTP_PROTOCOL_ERROR; 73763012Sdes chunked = 0; 73863012Sdes offset = 0; 73963012Sdes fd = -1; 74063012Sdes 74163012Sdes for (url = URL, i = 0; i < n; ++i) { 74263069Sdes new = NULL; 74363069Sdes us->size = -1; 74463069Sdes us->atime = us->mtime = 0; 74563069Sdes chunked = 0; 74663012Sdes need_auth = 0; 74763069Sdes offset = 0; 74863069Sdes fd = -1; 74963012Sdes retry: 75063012Sdes /* connect to server or proxy */ 75163012Sdes if ((fd = _http_connect(url, &proxy, flags)) == -1) 75263012Sdes goto ouch; 75363012Sdes 75463012Sdes host = url->host; 75560737Sume#ifdef INET6 75663012Sdes if (strchr(url->host, ':')) { 75763012Sdes snprintf(hbuf, sizeof(hbuf), "[%s]", url->host); 75863012Sdes host = hbuf; 75963012Sdes } 76060737Sume#endif 76137535Sdes 76263012Sdes /* send request */ 76363012Sdes if (verbose) 76463012Sdes _fetch_info("requesting %s://%s:%d%s", 76563012Sdes url->scheme, host, url->port, url->doc); 76663012Sdes if (proxy) { 76763012Sdes _http_cmd(fd, "%s %s://%s:%d%s HTTP/1.1", 76863012Sdes op, url->scheme, host, url->port, url->doc); 76963012Sdes } else { 77063012Sdes _http_cmd(fd, "%s %s HTTP/1.1", 77163012Sdes op, url->doc); 77263012Sdes } 77337535Sdes 77463012Sdes /* proxy authorization */ 77563012Sdes if (proxy && (p = getenv("HTTP_PROXY_AUTH")) != NULL) 77663012Sdes _http_authorize(fd, "Proxy-Authorization", p); 77763012Sdes 77863012Sdes /* server authorization */ 77963012Sdes if (need_auth) { 78063012Sdes if (*url->user || *url->pwd) 78163012Sdes _http_basic_auth(fd, "Authorization", 78263012Sdes url->user ? url->user : "", 78363012Sdes url->pwd ? url->pwd : ""); 78463012Sdes else if ((p = getenv("HTTP_AUTH")) != NULL) 78563012Sdes _http_authorize(fd, "Authorization", p); 78663012Sdes else { 78763012Sdes _http_seterr(HTTP_NEED_AUTH); 78863012Sdes goto ouch; 78963012Sdes } 79063012Sdes } 79160376Sdes 79263012Sdes /* other headers */ 79363012Sdes _http_cmd(fd, "Host: %s:%d", host, url->port); 79463012Sdes _http_cmd(fd, "User-Agent: %s " _LIBFETCH_VER, __progname); 79563012Sdes if (URL->offset) 79663012Sdes _http_cmd(fd, "Range: bytes=%lld-", url->offset); 79763012Sdes _http_cmd(fd, "Connection: close"); 79863012Sdes _http_cmd(fd, ""); 79960376Sdes 80063012Sdes /* get reply */ 80163012Sdes switch ((code = _http_get_reply(fd))) { 80263012Sdes case HTTP_OK: 80363012Sdes case HTTP_PARTIAL: 80463012Sdes /* fine */ 80563012Sdes break; 80663012Sdes case HTTP_MOVED_PERM: 80763012Sdes case HTTP_MOVED_TEMP: 80863012Sdes /* 80963012Sdes * Not so fine, but we still have to read the headers to 81063012Sdes * get the new location. 81163012Sdes */ 81263012Sdes break; 81363012Sdes case HTTP_NEED_AUTH: 81463012Sdes if (need_auth) { 81563012Sdes /* 81663012Sdes * We already sent out authorization code, so there's 81763012Sdes * nothing more we can do. 81863012Sdes */ 81963012Sdes _http_seterr(code); 82063012Sdes goto ouch; 82163012Sdes } 82263012Sdes /* try again, but send the password this time */ 82363012Sdes if (verbose) 82463012Sdes _fetch_info("server requires authorization"); 82563012Sdes need_auth = 1; 82663012Sdes close(fd); 82763012Sdes goto retry; 82863012Sdes case HTTP_NEED_PROXY_AUTH: 82963012Sdes /* 83063012Sdes * If we're talking to a proxy, we already sent our proxy 83163012Sdes * authorization code, so there's nothing more we can do. 83263012Sdes */ 83363012Sdes _http_seterr(code); 83463012Sdes goto ouch; 83563012Sdes case HTTP_PROTOCOL_ERROR: 83663012Sdes /* fall through */ 83763012Sdes case -1: 83863012Sdes _fetch_syserr(); 83963012Sdes goto ouch; 84063012Sdes default: 84163012Sdes _http_seterr(code); 84263012Sdes goto ouch; 84363012Sdes } 84463012Sdes 84563012Sdes /* get headers */ 84663012Sdes do { 84763012Sdes switch ((h = _http_next_header(fd, &p))) { 84863012Sdes case hdr_syserror: 84963012Sdes _fetch_syserr(); 85063012Sdes goto ouch; 85163012Sdes case hdr_error: 85263012Sdes _http_seterr(HTTP_PROTOCOL_ERROR); 85363012Sdes goto ouch; 85463012Sdes case hdr_content_length: 85563012Sdes us->size = _http_parse_length(p); 85663012Sdes break; 85763012Sdes case hdr_content_range: 85863012Sdes offset = _http_parse_range(p); 85963012Sdes break; 86063012Sdes case hdr_last_modified: 86163012Sdes us->atime = us->mtime = _http_parse_mtime(p); 86263012Sdes break; 86363012Sdes case hdr_location: 86463012Sdes if (!HTTP_REDIRECT(code)) 86563012Sdes break; 86663069Sdes if (new) 86763069Sdes free(new); 86863012Sdes if (verbose) 86963012Sdes _fetch_info("%d redirect to %s", code, p); 87063069Sdes if (*p == '/') 87163069Sdes /* absolute path */ 87263069Sdes new = fetchMakeURL(url->scheme, url->host, url->port, p, 87363069Sdes url->user, url->pwd); 87463069Sdes else 87563069Sdes new = fetchParseURL(p); 87663069Sdes if (new == NULL) { 87763069Sdes /* XXX should set an error code */ 87863069Sdes DEBUG(fprintf(stderr, "failed to parse new URL\n")); 87963012Sdes goto ouch; 88063069Sdes } 88163012Sdes if (!*new->user && !*new->pwd) { 88263012Sdes strcpy(new->user, url->user); 88363012Sdes strcpy(new->pwd, url->pwd); 88463012Sdes } 88563012Sdes new->offset = url->offset; 88663012Sdes new->length = url->length; 88763069Sdes break; 88863012Sdes case hdr_transfer_encoding: 88963012Sdes /* XXX weak test*/ 89063012Sdes chunked = (strcasecmp(p, "chunked") == 0); 89163012Sdes break; 89263012Sdes case hdr_end: 89363012Sdes /* fall through */ 89463012Sdes case hdr_unknown: 89563012Sdes /* ignore */ 89663012Sdes break; 89763012Sdes } 89863012Sdes } while (h > hdr_end); 89960376Sdes 90063069Sdes /* we either have a hit, or a redirect with no Location: header */ 90163069Sdes if (code == HTTP_OK || code == HTTP_PARTIAL || !new) 90263012Sdes break; 90363069Sdes 90463069Sdes /* we have a redirect */ 90563069Sdes close(fd); 90663069Sdes if (url != URL) 90763069Sdes fetchFreeURL(url); 90863069Sdes url = new; 90960376Sdes } 91060376Sdes 91163012Sdes /* no success */ 91263012Sdes if (fd == -1) { 91363012Sdes _http_seterr(code); 91463012Sdes goto ouch; 91537571Sdes } 91637535Sdes 91763012Sdes /* wrap it up in a FILE */ 91863012Sdes if ((f = chunked ? _http_funopen(fd) : fdopen(fd, "r")) == NULL) { 91963012Sdes _fetch_syserr(); 92063012Sdes goto ouch; 92163012Sdes } 92263012Sdes 92363012Sdes while (offset++ < url->offset) 92463012Sdes if (fgetc(f) == EOF) { 92563012Sdes _fetch_syserr(); 92660954Sdes fclose(f); 92763012Sdes f = NULL; 92837535Sdes } 92963012Sdes 93063012Sdes if (url != URL) 93163012Sdes fetchFreeURL(url); 93263012Sdes 93363012Sdes return f; 93437535Sdes 93563012Sdes ouch: 93663012Sdes if (url != URL) 93763012Sdes fetchFreeURL(url); 93863012Sdes if (fd != -1) 93963012Sdes close(fd); 94063012Sdes return NULL; 94163012Sdes} 94260189Sdes 94363012Sdes 94463012Sdes/***************************************************************************** 94563012Sdes * Entry points 94663012Sdes */ 94763012Sdes 94863012Sdes/* 94963012Sdes * Retrieve a file by HTTP 95063012Sdes */ 95163012SdesFILE * 95263012SdesfetchGetHTTP(struct url *URL, char *flags) 95363012Sdes{ 95463012Sdes struct url_stat us; 95537535Sdes 95663012Sdes return _http_request(URL, "GET", &us, flags); 95737535Sdes} 95837535Sdes 95937535SdesFILE * 96040975SdesfetchPutHTTP(struct url *URL, char *flags) 96137535Sdes{ 96237535Sdes warnx("fetchPutHTTP(): not implemented"); 96337535Sdes return NULL; 96437535Sdes} 96540975Sdes 96640975Sdes/* 96740975Sdes * Get an HTTP document's metadata 96840975Sdes */ 96940975Sdesint 97060376SdesfetchStatHTTP(struct url *URL, struct url_stat *us, char *flags) 97140975Sdes{ 97260376Sdes FILE *f; 97360376Sdes 97463012Sdes if ((f = _http_request(URL, "HEAD", us, flags)) == NULL) 97560376Sdes return -1; 97660581Sdes fclose(f); 97760376Sdes return 0; 97840975Sdes} 97941989Sdes 98041989Sdes/* 98141989Sdes * List a directory 98241989Sdes */ 98341989Sdesstruct url_ent * 98441989SdesfetchListHTTP(struct url *url, char *flags) 98541989Sdes{ 98641989Sdes warnx("fetchListHTTP(): not implemented"); 98741989Sdes return NULL; 98841989Sdes} 989