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authorAaron Griffin <aaron@archlinux.org>2006-10-31 06:34:33 +0000
committerAaron Griffin <aaron@archlinux.org>2006-10-31 06:34:33 +0000
commit78c0badc9b3629c5156d4bd0733a3e9a1e4e92c6 (patch)
tree040c810aa7cfe66f7259b39d08c4e7aded385b7d /lib/libfetch/http.c
parenta4355d8d73b68bd2dde1be4b0c6ac61c628a74af (diff)
downloadpacman-78c0badc9b3629c5156d4bd0733a3e9a1e4e92c6.tar.xz
Added libfetch linux port + misc changes
Diffstat (limited to 'lib/libfetch/http.c')
-rw-r--r--lib/libfetch/http.c1225
1 files changed, 1225 insertions, 0 deletions
diff --git a/lib/libfetch/http.c b/lib/libfetch/http.c
new file mode 100644
index 00000000..c173b5d5
--- /dev/null
+++ b/lib/libfetch/http.c
@@ -0,0 +1,1225 @@
+/*-
+ * 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);
+}