diff options
Diffstat (limited to 'lib/libfetch/http.c')
| -rw-r--r-- | lib/libfetch/http.c | 1225 |
1 files changed, 0 insertions, 1225 deletions
diff --git a/lib/libfetch/http.c b/lib/libfetch/http.c deleted file mode 100644 index c173b5d5..00000000 --- a/lib/libfetch/http.c +++ /dev/null @@ -1,1225 +0,0 @@ -/*- - * Copyright (c) 2000-2004 Dag-Erling Coïdan Smørgrav - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer - * in this position and unchanged. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. The name of the author may not be used to endorse or promote products - * derived from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. - * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF - * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#define _GNU_SOURCE - -#include <sys/cdefs.h> - -/* - * The following copyright applies to the base64 code: - * - *- - * Copyright 1997 Massachusetts Institute of Technology - * - * Permission to use, copy, modify, and distribute this software and - * its documentation for any purpose and without fee is hereby - * granted, provided that both the above copyright notice and this - * permission notice appear in all copies, that both the above - * copyright notice and this permission notice appear in all - * supporting documentation, and that the name of M.I.T. not be used - * in advertising or publicity pertaining to distribution of the - * software without specific, written prior permission. M.I.T. makes - * no representations about the suitability of this software for any - * purpose. It is provided "as is" without express or implied - * warranty. - * - * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS - * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, - * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT - * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF - * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND - * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, - * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT - * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#include <sys/param.h> -#include <sys/socket.h> - -#include <ctype.h> -#include <libio.h> -#include <err.h> -#include <errno.h> -#include <locale.h> -#include <netdb.h> -#include <stdarg.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <time.h> -#include <unistd.h> - -#include <netinet/in.h> -#include <netinet/tcp.h> - -#include "fetch.h" -#include "common.h" -#include "httperr.h" - -/* Maximum number of redirects to follow */ -#define MAX_REDIRECT 5 - -/* Symbolic names for reply codes we care about */ -#define HTTP_OK 200 -#define HTTP_PARTIAL 206 -#define HTTP_MOVED_PERM 301 -#define HTTP_MOVED_TEMP 302 -#define HTTP_SEE_OTHER 303 -#define HTTP_NEED_AUTH 401 -#define HTTP_NEED_PROXY_AUTH 407 -#define HTTP_BAD_RANGE 416 -#define HTTP_PROTOCOL_ERROR 999 - -#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \ - || (xyz) == HTTP_MOVED_TEMP \ - || (xyz) == HTTP_SEE_OTHER) - -#define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599) - - -/***************************************************************************** - * I/O functions for decoding chunked streams - */ - -struct httpio -{ - conn_t *conn; /* connection */ - int chunked; /* chunked mode */ - char *buf; /* chunk buffer */ - size_t bufsize; /* size of chunk buffer */ - ssize_t buflen; /* amount of data currently in buffer */ - int bufpos; /* current read offset in buffer */ - int eof; /* end-of-file flag */ - int error; /* error flag */ - size_t chunksize; /* remaining size of current chunk */ -#ifndef NDEBUG - size_t total; -#endif -}; - -/* - * Get next chunk header - */ -static int -_http_new_chunk(struct httpio *io) -{ - char hexdigits[23] = "0123456789abcdefABCDEF\0"; - char *p = NULL; - - if (_fetch_getln(io->conn) == -1) - return (-1); - - if (io->conn->buflen < 2 || !strchr(hexdigits, *p)) - return (-1); - - for (p = io->conn->buf; *p && !isspace(*p); ++p) { - if (*p == ';') - break; - if (!strchr(hexdigits, *p)) - return (-1); - if (isdigit(*p)) { - io->chunksize = io->chunksize * 16 + - *p - '0'; - } else { - io->chunksize = io->chunksize * 16 + - 10 + tolower(*p) - 'a'; - } - } - -#ifndef NDEBUG - if (fetchDebug) { - io->total += io->chunksize; - if (io->chunksize == 0) - fprintf(stderr, "%s(): end of last chunk\n", __func__); - else - fprintf(stderr, "%s(): new chunk: %lu (%lu)\n", - __func__, (unsigned long)io->chunksize, - (unsigned long)io->total); - } -#endif - - return (io->chunksize); -} - -/* - * Grow the input buffer to at least len bytes - */ -static inline int -_http_growbuf(struct httpio *io, size_t len) -{ - char *tmp; - - if (io->bufsize >= len) - return (0); - - if ((tmp = realloc(io->buf, len)) == NULL) - return (-1); - io->buf = tmp; - io->bufsize = len; - return (0); -} - -/* - * Fill the input buffer, do chunk decoding on the fly - */ -static int -_http_fillbuf(struct httpio *io, size_t len) -{ - if (io->error) - return (-1); - if (io->eof) - return (0); - - if (io->chunked == 0) { - if (_http_growbuf(io, len) == -1) - return (-1); - if ((io->buflen = _fetch_read(io->conn, io->buf, len)) == -1) { - io->error = 1; - return (-1); - } - io->bufpos = 0; - return (io->buflen); - } - - if (io->chunksize == 0) { - switch (_http_new_chunk(io)) { - case -1: - io->error = 1; - return (-1); - case 0: - io->eof = 1; - return (0); - } - } - - if (len > io->chunksize) - len = io->chunksize; - if (_http_growbuf(io, len) == -1) - return (-1); - if ((io->buflen = _fetch_read(io->conn, io->buf, len)) == -1) { - io->error = 1; - return (-1); - } - io->chunksize -= io->buflen; - - if (io->chunksize == 0) { - char endl[2]; - - if (_fetch_read(io->conn, endl, 2) != 2 || - endl[0] != '\r' || endl[1] != '\n') - return (-1); - } - - io->bufpos = 0; - - return (io->buflen); -} - -/* - * Read function - */ -static int -_http_readfn(void *v, char *buf, int len) -{ - struct httpio *io = (struct httpio *)v; - int l, pos; - - if (io->error) - return (-1); - if (io->eof) - return (0); - - for (pos = 0; len > 0; pos += l, len -= l) { - /* empty buffer */ - if (!io->buf || io->bufpos == io->buflen) - if (_http_fillbuf(io, len) < 1) - break; - l = io->buflen - io->bufpos; - if (len < l) - l = len; - bcopy(io->buf + io->bufpos, buf + pos, l); - io->bufpos += l; - } - - if (!pos && io->error) - return (-1); - return (pos); -} - -/* - * Write function - */ -static int -_http_writefn(void *v, const char *buf, int len) -{ - struct httpio *io = (struct httpio *)v; - - return (_fetch_write(io->conn, buf, len)); -} - -/* - * Close function - */ -static int -_http_closefn(void *v) -{ - struct httpio *io = (struct httpio *)v; - int r; - - r = _fetch_close(io->conn); - if (io->buf) - free(io->buf); - free(io); - return (r); -} - -/* - * Wrap a file descriptor up - */ -static FILE * -_http_funopen(conn_t *conn, int chunked) -{ - struct httpio *io; - FILE *f; - - if ((io = calloc(1, sizeof(*io))) == NULL) { - _fetch_syserr(); - return (NULL); - } - io->conn = conn; - io->chunked = chunked; - cookie_io_functions_t cookie; - cookie.read = (cookie_read_function_t *)_http_readfn; - cookie.write = (cookie_write_function_t *)_http_writefn; - cookie.seek = (cookie_seek_function_t *)NULL; - cookie.close = (cookie_close_function_t *)_http_closefn; - f = fopencookie(io, "rw", cookie); - if (f == NULL) { - _fetch_syserr(); - free(io); - return (NULL); - } - return (f); -} - - -/***************************************************************************** - * Helper functions for talking to the server and parsing its replies - */ - -/* Header types */ -typedef enum { - hdr_syserror = -2, - hdr_error = -1, - hdr_end = 0, - hdr_unknown = 1, - hdr_content_length, - hdr_content_range, - hdr_last_modified, - hdr_location, - hdr_transfer_encoding, - hdr_www_authenticate -} hdr_t; - -/* Names of interesting headers */ -static struct { - hdr_t num; - const char *name; -} hdr_names[] = { - { hdr_content_length, "Content-Length" }, - { hdr_content_range, "Content-Range" }, - { hdr_last_modified, "Last-Modified" }, - { hdr_location, "Location" }, - { hdr_transfer_encoding, "Transfer-Encoding" }, - { hdr_www_authenticate, "WWW-Authenticate" }, - { hdr_unknown, NULL }, -}; - -/* - * Send a formatted line; optionally echo to terminal - */ -static int -_http_cmd(conn_t *conn, const char *fmt, ...) -{ - va_list ap; - size_t len; - char *msg; - int r; - - va_start(ap, fmt); - len = vasprintf(&msg, fmt, ap); - va_end(ap); - - if (msg == NULL) { - errno = ENOMEM; - _fetch_syserr(); - return (-1); - } - - r = _fetch_putln(conn, msg, len); - free(msg); - - if (r == -1) { - _fetch_syserr(); - return (-1); - } - - return (0); -} - -/* - * Get and parse status line - */ -static int -_http_get_reply(conn_t *conn) -{ - char *p; - - if (_fetch_getln(conn) == -1) - return (-1); - /* - * A valid status line looks like "HTTP/m.n xyz reason" where m - * and n are the major and minor protocol version numbers and xyz - * is the reply code. - * Unfortunately, there are servers out there (NCSA 1.5.1, to name - * just one) that do not send a version number, so we can't rely - * on finding one, but if we do, insist on it being 1.0 or 1.1. - * We don't care about the reason phrase. - */ - if (strncmp(conn->buf, "HTTP", 4) != 0) - return (HTTP_PROTOCOL_ERROR); - p = conn->buf + 4; - if (*p == '/') { - if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) - return (HTTP_PROTOCOL_ERROR); - p += 4; - } - if (*p != ' ' || !isdigit(p[1]) || !isdigit(p[2]) || !isdigit(p[3])) - return (HTTP_PROTOCOL_ERROR); - - conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0'); - return (conn->err); -} - -/* - * Check a header; if the type matches the given string, return a pointer - * to the beginning of the value. - */ -static const char * -_http_match(const char *str, const char *hdr) -{ - while (*str && *hdr && tolower(*str++) == tolower(*hdr++)) - /* nothing */; - if (*str || *hdr != ':') - return (NULL); - while (*hdr && isspace(*++hdr)) - /* nothing */; - return (hdr); -} - -/* - * Get the next header and return the appropriate symbolic code. - */ -static hdr_t -_http_next_header(conn_t *conn, const char **p) -{ - int i; - - if (_fetch_getln(conn) == -1) - return (hdr_syserror); - while (conn->buflen && isspace(conn->buf[conn->buflen - 1])) - conn->buflen--; - conn->buf[conn->buflen] = '\0'; - if (conn->buflen == 0) - return (hdr_end); - /* - * We could check for malformed headers but we don't really care. - * A valid header starts with a token immediately followed by a - * colon; a token is any sequence of non-control, non-whitespace - * characters except "()<>@,;:\\\"{}". - */ - for (i = 0; hdr_names[i].num != hdr_unknown; i++) - if ((*p = _http_match(hdr_names[i].name, conn->buf)) != NULL) - return (hdr_names[i].num); - return (hdr_unknown); -} - -/* - * Parse a last-modified header - */ -static int -_http_parse_mtime(const char *p, time_t *mtime) -{ - char locale[64], *r; - struct tm tm; - - strncpy(locale, setlocale(LC_TIME, NULL), sizeof(locale)); - setlocale(LC_TIME, "C"); - r = (char *)strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); - /* XXX should add support for date-2 and date-3 */ - setlocale(LC_TIME, locale); - if (r == NULL) - return (-1); - DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d " - "%02d:%02d:%02d]\n", - tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, - tm.tm_hour, tm.tm_min, tm.tm_sec)); - *mtime = timegm(&tm); - return (0); -} - -/* - * Parse a content-length header - */ -static int -_http_parse_length(const char *p, off_t *length) -{ - off_t len; - - for (len = 0; *p && isdigit(*p); ++p) - len = len * 10 + (*p - '0'); - if (*p) - return (-1); - DEBUG(fprintf(stderr, "content length: [%lld]\n", - (long long)len)); - *length = len; - return (0); -} - -/* - * Parse a content-range header - */ -static int -_http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size) -{ - off_t first, last, len; - - if (strncasecmp(p, "bytes ", 6) != 0) - return (-1); - p += 6; - if (*p == '*') { - first = last = -1; - ++p; - } else { - for (first = 0; *p && isdigit(*p); ++p) - first = first * 10 + *p - '0'; - if (*p != '-') - return (-1); - for (last = 0, ++p; *p && isdigit(*p); ++p) - last = last * 10 + *p - '0'; - } - if (first > last || *p != '/') - return (-1); - for (len = 0, ++p; *p && isdigit(*p); ++p) - len = len * 10 + *p - '0'; - if (*p || len < last - first + 1) - return (-1); - if (first == -1) { - DEBUG(fprintf(stderr, "content range: [*/%lld]\n", - (long long)len)); - *length = 0; - } else { - DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n", - (long long)first, (long long)last, (long long)len)); - *length = last - first + 1; - } - *offset = first; - *size = len; - return (0); -} - - -/***************************************************************************** - * Helper functions for authorization - */ - -/* - * Base64 encoding - */ -static char * -_http_base64(const char *src) -{ - static const char base64[] = - "ABCDEFGHIJKLMNOPQRSTUVWXYZ" - "abcdefghijklmnopqrstuvwxyz" - "0123456789+/"; - char *str, *dst; - size_t l; - int t, r; - - l = strlen(src); - if ((str = malloc(((l + 2) / 3) * 4 + 1)) == NULL) - return (NULL); - dst = str; - r = 0; - - while (l >= 3) { - t = (src[0] << 16) | (src[1] << 8) | src[2]; - dst[0] = base64[(t >> 18) & 0x3f]; - dst[1] = base64[(t >> 12) & 0x3f]; - dst[2] = base64[(t >> 6) & 0x3f]; - dst[3] = base64[(t >> 0) & 0x3f]; - src += 3; l -= 3; - dst += 4; r += 4; - } - - switch (l) { - case 2: - t = (src[0] << 16) | (src[1] << 8); - dst[0] = base64[(t >> 18) & 0x3f]; - dst[1] = base64[(t >> 12) & 0x3f]; - dst[2] = base64[(t >> 6) & 0x3f]; - dst[3] = '='; - dst += 4; - r += 4; - break; - case 1: - t = src[0] << 16; - dst[0] = base64[(t >> 18) & 0x3f]; - dst[1] = base64[(t >> 12) & 0x3f]; - dst[2] = dst[3] = '='; - dst += 4; - r += 4; - break; - case 0: - break; - } - - *dst = 0; - return (str); -} - -/* - * Encode username and password - */ -static int -_http_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd) -{ - char *upw, *auth; - int r; - - DEBUG(fprintf(stderr, "usr: [%s]\n", usr)); - DEBUG(fprintf(stderr, "pwd: [%s]\n", pwd)); - if (asprintf(&upw, "%s:%s", usr, pwd) == -1) - return (-1); - auth = _http_base64(upw); - free(upw); - if (auth == NULL) - return (-1); - r = _http_cmd(conn, "%s: Basic %s", hdr, auth); - free(auth); - return (r); -} - -/* - * Send an authorization header - */ -static int -_http_authorize(conn_t *conn, const char *hdr, const char *p) -{ - /* basic authorization */ - if (strncasecmp(p, "basic:", 6) == 0) { - char *user, *pwd, *str; - int r; - - /* skip realm */ - for (p += 6; *p && *p != ':'; ++p) - /* nothing */ ; - if (!*p || strchr(++p, ':') == NULL) - return (-1); - if ((str = strdup(p)) == NULL) - return (-1); /* XXX */ - user = str; - pwd = strchr(str, ':'); - *pwd++ = '\0'; - r = _http_basic_auth(conn, hdr, user, pwd); - free(str); - return (r); - } - return (-1); -} - - -/***************************************************************************** - * Helper functions for connecting to a server or proxy - */ - -/* - * Connect to the correct HTTP server or proxy. - */ -static conn_t * -_http_connect(struct url *URL, struct url *purl, const char *flags) -{ - conn_t *conn; - int verbose; - int af; - -#ifdef INET6 - af = AF_UNSPEC; -#else - af = AF_INET; -#endif - - verbose = CHECK_FLAG('v'); - if (CHECK_FLAG('4')) - af = AF_INET; -#ifdef INET6 - else if (CHECK_FLAG('6')) - af = AF_INET6; -#endif - - if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) { - URL = purl; - } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { - /* can't talk http to an ftp server */ - /* XXX should set an error code */ - return (NULL); - } - - if ((conn = _fetch_connect(URL->host, URL->port, af, verbose)) == NULL) - /* _fetch_connect() has already set an error code */ - return (NULL); - if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && - _fetch_ssl(conn, verbose) == -1) { - _fetch_close(conn); - /* grrr */ - _fetch_syserr(); - return (NULL); - } - -#ifdef TCP_NOPUSH - int val = 1; - setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, sizeof(val)); -#endif - - return (conn); -} - -static struct url * -_http_get_proxy(const char *flags) -{ - struct url *purl; - char *p; - - if (flags != NULL && strchr(flags, 'd') != NULL) - return (NULL); - if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && - *p && (purl = fetchParseURL(p))) { - if (!*purl->scheme) - strcpy(purl->scheme, SCHEME_HTTP); - if (!purl->port) - purl->port = _fetch_default_proxy_port(purl->scheme); - if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) - return (purl); - fetchFreeURL(purl); - } - return (NULL); -} - -static void -_http_print_html(FILE *out, FILE *in) -{ - size_t len; - unsigned int sz = 1024; - char *line, *p, *q; - int comment, tag; - - line = (char *)calloc(1024, sizeof(char)); - comment = tag = 0; - while ((len = getline(&line, &sz, in)) > 0) { - while (len && isspace(line[len - 1])) - --len; - for (p = q = line; q < line + len; ++q) { - if (comment && *q == '-') { - if (q + 2 < line + len && - strcmp(q, "-->") == 0) { - tag = comment = 0; - q += 2; - } - } else if (tag && !comment && *q == '>') { - p = q + 1; - tag = 0; - } else if (!tag && *q == '<') { - if (q > p) - fwrite(p, q - p, 1, out); - tag = 1; - if (q + 3 < line + len && - strcmp(q, "<!--") == 0) { - comment = 1; - q += 3; - } - } - } - if (!tag && q > p) - fwrite(p, q - p, 1, out); - fputc('\n', out); - } -} - - -/***************************************************************************** - * Core - */ - -/* - * Send a request and process the reply - * - * XXX This function is way too long, the do..while loop should be split - * XXX off into a separate function. - */ -FILE * -_http_request(struct url *URL, const char *op, struct url_stat *us, - struct url *purl, const char *flags) -{ - conn_t *conn; - struct url *url, *new; - int chunked, direct, need_auth, noredirect, verbose; - int e, i, n, val; - off_t offset, clength, length, size; - time_t mtime; - const char *p; - FILE *f; - hdr_t h; - char hbuf[MAXHOSTNAMELEN + 7], *host; - - direct = CHECK_FLAG('d'); - noredirect = CHECK_FLAG('A'); - verbose = CHECK_FLAG('v'); - - if (direct && purl) { - fetchFreeURL(purl); - purl = NULL; - } - - /* try the provided URL first */ - url = URL; - - /* if the A flag is set, we only get one try */ - n = noredirect ? 1 : MAX_REDIRECT; - i = 0; - - e = HTTP_PROTOCOL_ERROR; - need_auth = 0; - do { - new = NULL; - chunked = 0; - offset = 0; - clength = -1; - length = -1; - size = -1; - mtime = 0; - - /* check port */ - if (!url->port) - url->port = _fetch_default_port(url->scheme); - - /* were we redirected to an FTP URL? */ - if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) { - if (strcmp(op, "GET") == 0) - return (_ftp_request(url, "RETR", us, purl, flags)); - else if (strcmp(op, "HEAD") == 0) - return (_ftp_request(url, "STAT", us, purl, flags)); - } - - /* connect to server or proxy */ - if ((conn = _http_connect(url, purl, flags)) == NULL) - goto ouch; - - host = url->host; -#ifdef INET6 - if (strchr(url->host, ':')) { - snprintf(hbuf, sizeof(hbuf), "[%s]", url->host); - host = hbuf; - } -#endif - if (url->port != _fetch_default_port(url->scheme)) { - if (host != hbuf) { - strcpy(hbuf, host); - host = hbuf; - } - snprintf(hbuf + strlen(hbuf), - sizeof(hbuf) - strlen(hbuf), ":%d", url->port); - } - - /* send request */ - if (verbose) - _fetch_info("requesting %s://%s%s", - url->scheme, host, url->doc); - if (purl) { - _http_cmd(conn, "%s %s://%s%s HTTP/1.1", - op, url->scheme, host, url->doc); - } else { - _http_cmd(conn, "%s %s HTTP/1.1", - op, url->doc); - } - - /* virtual host */ - _http_cmd(conn, "Host: %s", host); - - /* proxy authorization */ - if (purl) { - if (*purl->user || *purl->pwd) - _http_basic_auth(conn, "Proxy-Authorization", - purl->user, purl->pwd); - else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && *p != '\0') - _http_authorize(conn, "Proxy-Authorization", p); - } - - /* server authorization */ - if (need_auth || *url->user || *url->pwd) { - if (*url->user || *url->pwd) - _http_basic_auth(conn, "Authorization", url->user, url->pwd); - else if ((p = getenv("HTTP_AUTH")) != NULL && *p != '\0') - _http_authorize(conn, "Authorization", p); - else if (fetchAuthMethod && fetchAuthMethod(url) == 0) { - _http_basic_auth(conn, "Authorization", url->user, url->pwd); - } else { - _http_seterr(HTTP_NEED_AUTH); - goto ouch; - } - } - - /* other headers */ - if ((p = getenv("HTTP_REFERER")) != NULL && *p != '\0') { - if (strcasecmp(p, "auto") == 0) - _http_cmd(conn, "Referer: %s://%s%s", - url->scheme, host, url->doc); - else - _http_cmd(conn, "Referer: %s", p); - } - if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0') - _http_cmd(conn, "User-Agent: %s", p); - else - _http_cmd(conn, "User-Agent: " _LIBFETCH_VER); - if (url->offset > 0) - _http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset); - _http_cmd(conn, "Connection: close"); - _http_cmd(conn, ""); - - /* - * Force the queued request to be dispatched. Normally, one - * would do this with shutdown(2) but squid proxies can be - * configured to disallow such half-closed connections. To - * be compatible with such configurations, fiddle with socket - * options to force the pending data to be written. - */ -#ifdef TCP_NOPUSH - val = 0; - setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, - sizeof(val)); -#endif - val = 1; - setsockopt(conn->sd, IPPROTO_TCP, TCP_NODELAY, &val, - sizeof(val)); - - /* get reply */ - switch (_http_get_reply(conn)) { - case HTTP_OK: - case HTTP_PARTIAL: - /* fine */ - break; - case HTTP_MOVED_PERM: - case HTTP_MOVED_TEMP: - case HTTP_SEE_OTHER: - /* - * Not so fine, but we still have to read the - * headers to get the new location. - */ - break; - case HTTP_NEED_AUTH: - if (need_auth) { - /* - * We already sent out authorization code, - * so there's nothing more we can do. - */ - _http_seterr(conn->err); - goto ouch; - } - /* try again, but send the password this time */ - if (verbose) - _fetch_info("server requires authorization"); - break; - case HTTP_NEED_PROXY_AUTH: - /* - * If we're talking to a proxy, we already sent - * our proxy authorization code, so there's - * nothing more we can do. - */ - _http_seterr(conn->err); - goto ouch; - case HTTP_BAD_RANGE: - /* - * This can happen if we ask for 0 bytes because - * we already have the whole file. Consider this - * a success for now, and check sizes later. - */ - break; - case HTTP_PROTOCOL_ERROR: - /* fall through */ - case -1: - _fetch_syserr(); - goto ouch; - default: - _http_seterr(conn->err); - goto ouch; - /* fall through so we can get the full error message */ - } - - /* get headers */ - do { - switch ((h = _http_next_header(conn, &p))) { - case hdr_syserror: - _fetch_syserr(); - goto ouch; - case hdr_error: - _http_seterr(HTTP_PROTOCOL_ERROR); - goto ouch; - case hdr_content_length: - _http_parse_length(p, &clength); - break; - case hdr_content_range: - _http_parse_range(p, &offset, &length, &size); - break; - case hdr_last_modified: - _http_parse_mtime(p, &mtime); - break; - case hdr_location: - if (!HTTP_REDIRECT(conn->err)) - break; - if (new) - free(new); - if (verbose) - _fetch_info("%d redirect to %s", conn->err, p); - if (*p == '/') - /* absolute path */ - new = fetchMakeURL(url->scheme, url->host, url->port, p, - url->user, url->pwd); - else - new = fetchParseURL(p); - if (new == NULL) { - /* XXX should set an error code */ - DEBUG(fprintf(stderr, "failed to parse new URL\n")); - goto ouch; - } - if (!*new->user && !*new->pwd) { - strcpy(new->user, url->user); - strcpy(new->pwd, url->pwd); - } - new->offset = url->offset; - new->length = url->length; - break; - case hdr_transfer_encoding: - /* XXX weak test*/ - chunked = (strcasecmp(p, "chunked") == 0); - break; - case hdr_www_authenticate: - if (conn->err != HTTP_NEED_AUTH) - break; - /* if we were smarter, we'd check the method and realm */ - break; - case hdr_end: - /* fall through */ - case hdr_unknown: - /* ignore */ - break; - } - } while (h > hdr_end); - - /* we need to provide authentication */ - if (conn->err == HTTP_NEED_AUTH) { - e = conn->err; - need_auth = 1; - _fetch_close(conn); - conn = NULL; - continue; - } - - /* requested range not satisfiable */ - if (conn->err == HTTP_BAD_RANGE) { - if (url->offset == size && url->length == 0) { - /* asked for 0 bytes; fake it */ - offset = url->offset; - conn->err = HTTP_OK; - break; - } else { - _http_seterr(conn->err); - goto ouch; - } - } - - /* we have a hit or an error */ - if (conn->err == HTTP_OK || conn->err == HTTP_PARTIAL || HTTP_ERROR(conn->err)) - break; - - /* all other cases: we got a redirect */ - e = conn->err; - need_auth = 0; - _fetch_close(conn); - conn = NULL; - if (!new) { - DEBUG(fprintf(stderr, "redirect with no new location\n")); - break; - } - if (url != URL) - fetchFreeURL(url); - url = new; - } while (++i < n); - - /* we failed, or ran out of retries */ - if (conn == NULL) { - _http_seterr(e); - goto ouch; - } - - DEBUG(fprintf(stderr, "offset %lld, length %lld," - " size %lld, clength %lld\n", - (long long)offset, (long long)length, - (long long)size, (long long)clength)); - - /* check for inconsistencies */ - if (clength != -1 && length != -1 && clength != length) { - _http_seterr(HTTP_PROTOCOL_ERROR); - goto ouch; - } - if (clength == -1) - clength = length; - if (clength != -1) - length = offset + clength; - if (length != -1 && size != -1 && length != size) { - _http_seterr(HTTP_PROTOCOL_ERROR); - goto ouch; - } - if (size == -1) - size = length; - - /* fill in stats */ - if (us) { - us->size = size; - us->atime = us->mtime = mtime; - } - - /* too far? */ - if (URL->offset > 0 && offset > URL->offset) { - _http_seterr(HTTP_PROTOCOL_ERROR); - goto ouch; - } - - /* report back real offset and size */ - URL->offset = offset; - URL->length = clength; - - /* wrap it up in a FILE */ - if ((f = _http_funopen(conn, chunked)) == NULL) { - _fetch_syserr(); - goto ouch; - } - - if (url != URL) - fetchFreeURL(url); - if (purl) - fetchFreeURL(purl); - - if (HTTP_ERROR(conn->err)) { - _http_print_html(stderr, f); - fclose(f); - f = NULL; - } - - return (f); - -ouch: - if (url != URL) - fetchFreeURL(url); - if (purl) - fetchFreeURL(purl); - if (conn != NULL) - _fetch_close(conn); - return (NULL); -} - - -/***************************************************************************** - * Entry points - */ - -/* - * Retrieve and stat a file by HTTP - */ -FILE * -fetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags) -{ - return (_http_request(URL, "GET", us, _http_get_proxy(flags), flags)); -} - -/* - * Retrieve a file by HTTP - */ -FILE * -fetchGetHTTP(struct url *URL, const char *flags) -{ - return (fetchXGetHTTP(URL, NULL, flags)); -} - -/* - * Store a file by HTTP - */ -FILE * -fetchPutHTTP(struct url *URL, const char *flags) -{ - warnx("fetchPutHTTP(): not implemented"); - return (NULL); -} - -/* - * Get an HTTP document's metadata - */ -int -fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags) -{ - FILE *f; - - f = _http_request(URL, "HEAD", us, _http_get_proxy(flags), flags); - if (f == NULL) - return (-1); - fclose(f); - return (0); -} - -/* - * List a directory - */ -struct url_ent * -fetchListHTTP(struct url *url, const char *flags) -{ - warnx("fetchListHTTP(): not implemented"); - return (NULL); -} |