/* * download.c * * Copyright (c) 2006-2011 Pacman Development Team <pacman-dev@archlinux.org> * Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "config.h" #include <stdlib.h> #include <stdio.h> #include <errno.h> #include <string.h> #include <unistd.h> #include <sys/time.h> #include <sys/types.h> #include <sys/stat.h> #include <signal.h> #ifdef HAVE_LIBCURL #include <curl/curl.h> #endif /* libalpm */ #include "dload.h" #include "alpm_list.h" #include "alpm.h" #include "log.h" #include "util.h" #include "handle.h" #ifdef HAVE_LIBCURL static double prevprogress; /* last download amount */ static const char *get_filename(const char *url) { char *filename = strrchr(url, '/'); if(filename != NULL) { filename++; } return filename; } static char *get_fullpath(const char *path, const char *filename, const char *suffix) { char *filepath; /* len = localpath len + filename len + suffix len + null */ size_t len = strlen(path) + strlen(filename) + strlen(suffix) + 1; CALLOC(filepath, len, sizeof(char), return NULL); snprintf(filepath, len, "%s%s%s", path, filename, suffix); return filepath; } #define check_stop() if(dload_interrupted) { ret = -1; goto cleanup; } enum sighandlers { OLD = 0, NEW = 1 }; static int dload_interrupted; static void inthandler(int UNUSED signum) { dload_interrupted = 1; } static int curl_progress(void *file, double dltotal, double dlnow, double UNUSED ultotal, double UNUSED ulnow) { struct dload_payload *payload = (struct dload_payload *)file; double current_size, total_size; /* SIGINT sent, abort by alerting curl */ if(dload_interrupted) { return 1; } /* none of what follows matters if the front end has no callback */ if(payload->handle->dlcb == NULL) { return 0; } current_size = payload->initial_size + dlnow; total_size = payload->initial_size + dltotal; if(DOUBLE_EQ(dltotal, 0) || DOUBLE_EQ(prevprogress, total_size)) { return 0; } /* initialize the progress bar here to avoid displaying it when * a repo is up to date and nothing gets downloaded */ if(DOUBLE_EQ(prevprogress, 0)) { payload->handle->dlcb(payload->filename, 0, (long)dltotal); } payload->handle->dlcb(payload->filename, (long)current_size, (long)total_size); prevprogress = current_size; return 0; } static int curl_gethost(const char *url, char *buffer) { size_t hostlen; char *p; if(strncmp(url, "file://", 7) == 0) { strcpy(buffer, _("disk")); } else { p = strstr(url, "//"); if(!p) { return 1; } p += 2; /* jump over the found // */ hostlen = strcspn(p, "/"); if(hostlen > 255) { /* buffer overflow imminent */ return 1; } snprintf(buffer, hostlen + 1, "%s", p); } return 0; } static int utimes_long(const char *path, long seconds) { if(seconds != -1) { struct timeval tv[2]; memset(&tv, 0, sizeof(tv)); tv[0].tv_sec = tv[1].tv_sec = seconds; return utimes(path, tv); } return 0; } static size_t parse_headers(void *ptr, size_t size, size_t nmemb, void *user) { size_t realsize = size * nmemb; const char *fptr, *endptr = NULL; const char * const cd_header = "Content-Disposition:"; const char * const fn_key = "filename="; struct dload_payload *payload = (struct dload_payload *)user; if(_alpm_raw_ncmp(cd_header, ptr, strlen(cd_header)) == 0) { if((fptr = strstr(ptr, fn_key))) { fptr += strlen(fn_key); /* find the end of the field, which is either a semi-colon, or the end of * the data. As per curl_easy_setopt(3), we cannot count on headers being * null terminated, so we look for the closing \r\n */ endptr = fptr + strcspn(fptr, ";\r\n") - 1; /* remove quotes */ if(*fptr == '"' && *endptr == '"') { fptr++; endptr--; } STRNDUP(payload->cd_filename, fptr, endptr - fptr + 1, RET_ERR(payload->handle, ALPM_ERR_MEMORY, realsize)); } } return realsize; } static int curl_download_internal(struct dload_payload *payload, const char *localpath, char **final_file) { int ret = -1, should_unlink = !payload->allow_resume; FILE *localf = NULL; const char *useragent; const char *open_mode = "wb"; char *destfile = NULL, *tempfile = NULL, *effective_url; /* RFC1123 states applications should support this length */ char hostname[256]; char error_buffer[CURL_ERROR_SIZE]; struct stat st; long timecond, remote_time = -1; double remote_size, bytes_dl; struct sigaction sig_pipe[2], sig_int[2]; /* shortcut to our handle within the payload */ alpm_handle_t *handle = payload->handle; handle->pm_errno = 0; if(!payload->filename) { payload->filename = get_filename(payload->fileurl); } if(!payload->filename || curl_gethost(payload->fileurl, hostname) != 0) { _alpm_log(handle, ALPM_LOG_ERROR, _("url '%s' is invalid\n"), payload->fileurl); RET_ERR(handle, ALPM_ERR_SERVER_BAD_URL, -1); } if(strlen(payload->filename) > 0 && strcmp(payload->filename, ".sig") != 0) { destfile = get_fullpath(localpath, payload->filename, ""); tempfile = get_fullpath(localpath, payload->filename, ".part"); if(!destfile || !tempfile) { goto cleanup; } } else { /* URL isn't to a file and ended with a slash */ int fd; char randpath[PATH_MAX]; /* we can't support resuming this kind of download, so a partial transfer * will be destroyed */ should_unlink = 1; /* create a random filename, which is opened with O_EXCL */ snprintf(randpath, PATH_MAX, "%salpmtmp.XXXXXX", localpath); if((fd = mkstemp(randpath)) == -1 || !(localf = fdopen(fd, open_mode))) { unlink(randpath); close(fd); _alpm_log(handle, ALPM_LOG_ERROR, _("failed to create temporary file for download\n")); goto cleanup; } /* localf now points to our alpmtmp.XXXXXX */ STRDUP(tempfile, randpath, RET_ERR(handle, ALPM_ERR_MEMORY, -1)); payload->filename = strrchr(randpath, '/') + 1; } error_buffer[0] = '\0'; /* the curl_easy handle is initialized with the alpm handle, so we only need * to reset the curl handle set parameters for each time it's used. */ curl_easy_reset(handle->curl); curl_easy_setopt(handle->curl, CURLOPT_URL, payload->fileurl); curl_easy_setopt(handle->curl, CURLOPT_FAILONERROR, 1L); curl_easy_setopt(handle->curl, CURLOPT_ERRORBUFFER, error_buffer); curl_easy_setopt(handle->curl, CURLOPT_CONNECTTIMEOUT, 10L); curl_easy_setopt(handle->curl, CURLOPT_FILETIME, 1L); curl_easy_setopt(handle->curl, CURLOPT_NOPROGRESS, 0L); curl_easy_setopt(handle->curl, CURLOPT_FOLLOWLOCATION, 1L); curl_easy_setopt(handle->curl, CURLOPT_PROGRESSFUNCTION, curl_progress); curl_easy_setopt(handle->curl, CURLOPT_PROGRESSDATA, (void *)payload); curl_easy_setopt(handle->curl, CURLOPT_LOW_SPEED_LIMIT, 1024L); curl_easy_setopt(handle->curl, CURLOPT_LOW_SPEED_TIME, 10L); curl_easy_setopt(handle->curl, CURLOPT_HEADERFUNCTION, parse_headers); curl_easy_setopt(handle->curl, CURLOPT_WRITEHEADER, (void *)payload); if(payload->max_size) { curl_easy_setopt(handle->curl, CURLOPT_MAXFILESIZE, payload->max_size); } useragent = getenv("HTTP_USER_AGENT"); if(useragent != NULL) { curl_easy_setopt(handle->curl, CURLOPT_USERAGENT, useragent); } if(!payload->allow_resume && !payload->force && destfile && stat(destfile, &st) == 0) { /* start from scratch, but only download if our local is out of date. */ curl_easy_setopt(handle->curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE); curl_easy_setopt(handle->curl, CURLOPT_TIMEVALUE, (long)st.st_mtime); } else if(stat(tempfile, &st) == 0 && payload->allow_resume) { /* a previous partial download exists, resume from end of file. */ open_mode = "ab"; curl_easy_setopt(handle->curl, CURLOPT_RESUME_FROM, (long)st.st_size); _alpm_log(handle, ALPM_LOG_DEBUG, "tempfile found, attempting continuation\n"); payload->initial_size = (double)st.st_size; } if(localf == NULL) { localf = fopen(tempfile, open_mode); if(localf == NULL) { goto cleanup; } } curl_easy_setopt(handle->curl, CURLOPT_WRITEDATA, localf); /* ignore any SIGPIPE signals- these may occur if our FTP socket dies or * something along those lines. Store the old signal handler first. */ sig_pipe[NEW].sa_handler = SIG_IGN; sigemptyset(&sig_pipe[NEW].sa_mask); sig_pipe[NEW].sa_flags = 0; sigaction(SIGPIPE, NULL, &sig_pipe[OLD]); sigaction(SIGPIPE, &sig_pipe[NEW], NULL); dload_interrupted = 0; sig_int[NEW].sa_handler = &inthandler; sigemptyset(&sig_int[NEW].sa_mask); sig_int[NEW].sa_flags = 0; sigaction(SIGINT, NULL, &sig_int[OLD]); sigaction(SIGINT, &sig_int[NEW], NULL); /* Progress 0 - initialize */ prevprogress = 0; /* perform transfer */ handle->curlerr = curl_easy_perform(handle->curl); /* immediately unhook the progress callback */ curl_easy_setopt(handle->curl, CURLOPT_NOPROGRESS, 1L); /* was it a success? */ switch(handle->curlerr) { case CURLE_OK: break; case CURLE_ABORTED_BY_CALLBACK: goto cleanup; case CURLE_OPERATION_TIMEDOUT: /* fallthrough */ default: if(!payload->errors_ok) { handle->pm_errno = ALPM_ERR_LIBCURL; _alpm_log(handle, ALPM_LOG_ERROR, _("failed retrieving file '%s' from %s : %s\n"), payload->filename, hostname, error_buffer); } else { _alpm_log(handle, ALPM_LOG_DEBUG, "failed retrieving file '%s' from %s : %s\n", payload->filename, hostname, error_buffer); } goto cleanup; } /* retrieve info about the state of the transfer */ curl_easy_getinfo(handle->curl, CURLINFO_FILETIME, &remote_time); curl_easy_getinfo(handle->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &remote_size); curl_easy_getinfo(handle->curl, CURLINFO_SIZE_DOWNLOAD, &bytes_dl); curl_easy_getinfo(handle->curl, CURLINFO_CONDITION_UNMET, &timecond); curl_easy_getinfo(handle->curl, CURLINFO_EFFECTIVE_URL, &effective_url); /* time condition was met and we didn't download anything. we need to * clean up the 0 byte .part file that's left behind. */ if(timecond == 1 && DOUBLE_EQ(bytes_dl, 0)) { ret = 1; unlink(tempfile); goto cleanup; } /* remote_size isn't necessarily the full size of the file, just what the * server reported as remaining to download. compare it to what curl reported * as actually being transferred during curl_easy_perform() */ if(!DOUBLE_EQ(remote_size, -1) && !DOUBLE_EQ(bytes_dl, -1) && !DOUBLE_EQ(bytes_dl, remote_size)) { handle->pm_errno = ALPM_ERR_RETRIEVE; _alpm_log(handle, ALPM_LOG_ERROR, _("%s appears to be truncated: %jd/%jd bytes\n"), payload->filename, (intmax_t)bytes_dl, (intmax_t)remote_size); goto cleanup; } if(payload->cd_filename) { /* content-disposition header has a better name for our file */ free(destfile); destfile = get_fullpath(localpath, payload->cd_filename, ""); } else { const char *effective_filename = strrchr(effective_url, '/'); if(effective_filename && strlen(effective_filename) > 2) { effective_filename++; /* if destfile was never set, we wrote to a tempfile. even if destfile is * set, we may have followed some redirects and the effective url may * have a better suggestion as to what to name our file. in either case, * refactor destfile to this newly derived name. */ if(!destfile || strcmp(effective_filename, strrchr(destfile, '/') + 1) != 0) { free(destfile); destfile = get_fullpath(localpath, effective_filename, ""); } } } ret = 0; cleanup: if(localf != NULL) { fclose(localf); utimes_long(tempfile, remote_time); } if(ret == 0) { if (destfile) { if(rename(tempfile, destfile)) { _alpm_log(handle, ALPM_LOG_ERROR, _("could not rename %s to %s (%s)\n"), tempfile, destfile, strerror(errno)); ret = -1; } else if(final_file) { STRDUP(*final_file, strrchr(destfile, '/') + 1, RET_ERR(handle, ALPM_ERR_MEMORY, -1)); } } else if(final_file) { STRDUP(*final_file, strrchr(tempfile, '/') + 1, RET_ERR(handle, ALPM_ERR_MEMORY, -1)); } } if((ret == -1 || dload_interrupted) && should_unlink) { unlink(tempfile); } FREE(tempfile); FREE(destfile); /* restore the old signal handlers */ sigaction(SIGINT, &sig_int[OLD], NULL); sigaction(SIGPIPE, &sig_pipe[OLD], NULL); /* if we were interrupted, trip the old handler */ if(dload_interrupted) { raise(SIGINT); } return ret; } #endif /** Download a file given by a URL to a local directory. * Does not overwrite an existing file if the download fails. * @param payload the payload context * @param localpath the directory to save the file in * @param final_file the real name of the downloaded file (may be NULL) * @return 0 on success, -1 on error (pm_errno is set accordingly if errors_ok == 0) */ int _alpm_download(struct dload_payload *payload, const char *localpath, char **final_file) { alpm_handle_t *handle = payload->handle; if(handle->fetchcb == NULL) { #ifdef HAVE_LIBCURL return curl_download_internal(payload, localpath, final_file); #else RET_ERR(handle, ALPM_ERR_EXTERNAL_DOWNLOAD, -1); #endif } else { int ret = handle->fetchcb(payload->fileurl, localpath, payload->force); if(ret == -1 && !payload->errors_ok) { RET_ERR(handle, ALPM_ERR_EXTERNAL_DOWNLOAD, -1); } return ret; } } /** Fetch a remote pkg. */ char SYMEXPORT *alpm_fetch_pkgurl(alpm_handle_t *handle, const char *url) { char *filepath; const char *cachedir; char *final_file = NULL; struct dload_payload *payload; int ret; CHECK_HANDLE(handle, return NULL); ASSERT(url, RET_ERR(handle, ALPM_ERR_WRONG_ARGS, NULL)); /* find a valid cache dir to download to */ cachedir = _alpm_filecache_setup(handle); CALLOC(payload, 1, sizeof(*payload), RET_ERR(handle, ALPM_ERR_MEMORY, NULL)); payload->handle = handle; STRDUP(payload->fileurl, url, RET_ERR(handle, ALPM_ERR_MEMORY, NULL)); payload->allow_resume = 1; /* download the file */ ret = _alpm_download(payload, cachedir, &final_file); if(ret == -1) { _alpm_log(handle, ALPM_LOG_WARNING, _("failed to download %s\n"), url); return NULL; } _alpm_log(handle, ALPM_LOG_DEBUG, "successfully downloaded %s\n", url); /* attempt to download the signature */ if(ret == 0 && (handle->siglevel & ALPM_SIG_PACKAGE)) { char *sig_final_file = NULL; size_t len; struct dload_payload *sig_payload; CALLOC(sig_payload, 1, sizeof(*sig_payload), RET_ERR(handle, ALPM_ERR_MEMORY, NULL)); len = strlen(url) + 5; CALLOC(sig_payload->fileurl, len, sizeof(char), RET_ERR(handle, ALPM_ERR_MEMORY, NULL)); snprintf(sig_payload->fileurl, len, "%s.sig", url); sig_payload->handle = handle; sig_payload->force = 1; sig_payload->errors_ok = (handle->siglevel & ALPM_SIG_PACKAGE_OPTIONAL); ret = _alpm_download(sig_payload, cachedir, &sig_final_file); if(ret == -1 && !sig_payload->errors_ok) { _alpm_log(handle, ALPM_LOG_WARNING, _("failed to download %s\n"), sig_payload->fileurl); /* Warn now, but don't return NULL. We will fail later during package * load time. */ } else if(ret == 0) { _alpm_log(handle, ALPM_LOG_DEBUG, "successfully downloaded %s\n", sig_payload->fileurl); } FREE(sig_final_file); _alpm_dload_payload_free(sig_payload); } /* we should be able to find the file the second time around */ filepath = _alpm_filecache_find(handle, final_file); FREE(final_file); _alpm_dload_payload_free(payload); return filepath; } void _alpm_dload_payload_free(struct dload_payload *payload) { ASSERT(payload, return); FREE(payload->fileurl); FREE(payload->cd_filename); FREE(payload); } /* vim: set ts=2 sw=2 noet: */