/*- * Copyright (c) 2009-2013 Juan Romero Pardines * 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. * * From FreeBSD fetch(8): * $FreeBSD: src/usr.bin/fetch/fetch.c,v 1.84.2.1 2009/08/03 08:13:06 kensmith Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include #include "xbps_api_impl.h" #include "fetch.h" #include "compat.h" /** * @file lib/download.c * @brief Download routines * @defgroup download Download functions * * XBPS download related functions, frontend for NetBSD's libfetch. */ static const char * print_time(time_t *t) { struct tm tm; static char buf[255]; gmtime_r(t, &tm); strftime(buf, sizeof(buf), "%d %b %Y %H:%M", &tm); return buf; } void HIDDEN xbps_fetch_set_cache_connection(int global, int per_host) { if (global == 0) global = XBPS_FETCH_CACHECONN; if (per_host == 0) per_host = XBPS_FETCH_CACHECONN_HOST; fetchConnectionCacheInit(global, per_host); } void HIDDEN xbps_fetch_unset_cache_connection(void) { fetchConnectionCacheClose(); } const char * xbps_fetch_error_string(void) { if (fetchLastErrCode == 0 || fetchLastErrCode == FETCH_OK) return NULL; return fetchLastErrString; } int xbps_fetch_file_dest_sha256(struct xbps_handle *xhp, const char *uri, const char *filename, const char *flags, unsigned char *digest, size_t digestlen) { struct stat st, st_tmpfile, *stp; struct url *url = NULL; struct url_stat url_st; struct fetchIO *fio = NULL; struct timespec ts[2]; off_t bytes_dload = 0; ssize_t bytes_read = 0, bytes_written = 0; char buf[4096], *tempfile = NULL; char fetch_flags[8]; int fd = -1, rv = 0; bool refetch = false, restart = false; SHA256_CTX sha256; assert(xhp); assert(uri); if (digest != NULL) { assert(digestlen >= XBPS_SHA256_DIGEST_SIZE); if (digestlen < XBPS_SHA256_DIGEST_SIZE) { errno = ENOBUFS; return -1; } SHA256_Init(&sha256); } /* Extern vars declared in libfetch */ fetchLastErrCode = 0; if (!filename || (url = fetchParseURL(uri)) == NULL) return -1; memset(&fetch_flags, 0, sizeof(fetch_flags)); if (flags != NULL) xbps_strlcpy(fetch_flags, flags, 7); tempfile = xbps_xasprintf("%s.part", filename); /* * Check if we have to resume a transfer. */ memset(&st_tmpfile, 0, sizeof(st_tmpfile)); if (stat(tempfile, &st_tmpfile) == 0) { if (st_tmpfile.st_size > 0) restart = true; } else { if (errno != ENOENT) { rv = -1; goto fetch_file_out; } } /* * Check if we have to refetch a transfer. */ memset(&st, 0, sizeof(st)); if (stat(filename, &st) == 0) { refetch = true; url->last_modified = st.st_mtime; xbps_strlcat(fetch_flags, "i", sizeof(fetch_flags)); } else { if (errno != ENOENT) { rv = -1; goto fetch_file_out; } } if (refetch && !restart) { /* fetch the whole file, filename available */ stp = &st; } else { /* resume transfer, partial file found */ stp = &st_tmpfile; url->offset = stp->st_size; } /* * Issue a GET request. */ fio = fetchXGet(url, &url_st, fetch_flags); /* debug stuff */ xbps_dbg_printf(xhp, "st.st_size: %zd\n", (ssize_t)stp->st_size); xbps_dbg_printf(xhp, "st.st_atime: %s\n", print_time(&stp->st_atime)); xbps_dbg_printf(xhp, "st.st_mtime: %s\n", print_time(&stp->st_mtime)); xbps_dbg_printf(xhp, "url_stat.size: %zd\n", (ssize_t)url_st.size); xbps_dbg_printf(xhp, "url_stat.atime: %s\n", print_time(&url_st.atime)); xbps_dbg_printf(xhp, "url_stat.mtime: %s\n", print_time(&url_st.mtime)); if (fio == NULL) { if (fetchLastErrCode == FETCH_UNCHANGED) { /* Last-Modified matched */ goto fetch_file_out; } else if (fetchLastErrCode == FETCH_PROTO && url_st.size == stp->st_size) { /* 413, requested offset == length */ goto rename_file; } rv = -1; goto fetch_file_out; } if (url_st.size == -1) { xbps_dbg_printf(xhp, "Remote file size is unknown, resume " "not possible...\n"); restart = false; } else if (stp->st_size > url_st.size) { /* * Remove local file if bigger than remote, and refetch the * whole shit again. */ xbps_dbg_printf(xhp, "Local file %s is greater than remote, " "removing local file and refetching...\n", filename); (void)remove(tempfile); restart = false; } xbps_dbg_printf(xhp, "url->scheme: %s\n", url->scheme); xbps_dbg_printf(xhp, "url->host: %s\n", url->host); xbps_dbg_printf(xhp, "url->port: %d\n", url->port); xbps_dbg_printf(xhp, "url->doc: %s\n", url->doc); xbps_dbg_printf(xhp, "url->offset: %zd\n", (ssize_t)url->offset); xbps_dbg_printf(xhp, "url->length: %zu\n", url->length); xbps_dbg_printf(xhp, "url->last_modified: %s\n", print_time(&url->last_modified)); /* * If restarting, open the file for appending otherwise create it. */ if (restart) fd = open(tempfile, O_RDWR|O_CLOEXEC); else fd = open(tempfile, O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC, 0644); if (fd == -1) { rv = -1; goto fetch_file_out; } /* * If restarting and digest was requested, read the current data * and feed into sha256 hash. */ if (restart) { if (digest) { while ((bytes_read = read(fd, buf, sizeof(buf))) > 0) { SHA256_Update(&sha256, buf, bytes_read); } if (bytes_read == -1) { xbps_dbg_printf(xhp, "IO error while reading %s: %s\n", tempfile, strerror(errno)); errno = EIO; rv = -1; goto fetch_file_out; } } lseek(fd, 0, SEEK_END); } /* * Initialize data for the fetch progress function callback * and let the user know that the transfer is going to start * immediately. */ xbps_set_cb_fetch(xhp, url_st.size, url->offset, url->offset, filename, true, false, false); /* * Start fetching requested file. */ while ((bytes_read = fetchIO_read(fio, buf, sizeof(buf))) > 0) { if (digest) SHA256_Update(&sha256, buf, bytes_read); bytes_written = write(fd, buf, (size_t)bytes_read); if (bytes_written != bytes_read) { xbps_dbg_printf(xhp, "Couldn't write to %s!\n", tempfile); rv = -1; goto fetch_file_out; } bytes_dload += bytes_read; /* * Let the fetch progress callback know that * we are sucking more bytes from it. */ xbps_set_cb_fetch(xhp, url_st.size, url->offset, url->offset + bytes_dload, filename, false, true, false); } if (bytes_read == -1) { xbps_dbg_printf(xhp, "IO error while fetching %s: %s\n", filename, fetchLastErrString); errno = EIO; rv = -1; goto fetch_file_out; } else if (url_st.size > 0 && ((bytes_dload + url->offset) != url_st.size)) { xbps_dbg_printf(xhp, "file %s is truncated\n", filename); errno = EIO; rv = -1; goto fetch_file_out; } /* * Let the fetch progress callback know that the file * has been fetched. */ xbps_set_cb_fetch(xhp, url_st.size, url->offset, bytes_dload, filename, false, false, true); /* * Update mtime in local file to match remote file if transfer * was successful. */ ts[0].tv_sec = url_st.atime ? url_st.atime : url_st.mtime; ts[1].tv_sec = url_st.mtime; ts[0].tv_nsec = ts[1].tv_nsec = 0; if (futimens(fd, ts) == -1) { rv = -1; goto fetch_file_out; } (void)close(fd); fd = -1; rename_file: /* File downloaded successfully, rename to destfile */ if (rename(tempfile, filename) == -1) { xbps_dbg_printf(xhp, "failed to rename %s to %s: %s", tempfile, filename, strerror(errno)); rv = -1; goto fetch_file_out; } rv = 1; if (digest) SHA256_Final(digest, &sha256); fetch_file_out: if (fio != NULL) fetchIO_close(fio); if (fd != -1) (void)close(fd); if (url != NULL) fetchFreeURL(url); free(tempfile); return rv; } int xbps_fetch_file_dest(struct xbps_handle *xhp, const char *uri, const char *filename, const char *flags) { return xbps_fetch_file_dest_sha256(xhp, uri, filename, flags, NULL, 0); } int xbps_fetch_file_sha256(struct xbps_handle *xhp, const char *uri, const char *flags, unsigned char *digest, size_t digestlen) { const char *filename; /* * Get the filename specified in URI argument. */ if ((filename = strrchr(uri, '/')) == NULL) return -1; filename++; return xbps_fetch_file_dest_sha256(xhp, uri, filename, flags, digest, digestlen); } int xbps_fetch_file(struct xbps_handle *xhp, const char *uri, const char *flags) { return xbps_fetch_file_sha256(xhp, uri, flags, NULL, 0); }