/* * 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 <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 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; MALLOC(filepath, len, return NULL); snprintf(filepath, len, "%s%s%s", path, filename, suffix); return filepath; } static CURL *get_libcurl_handle(alpm_handle_t *handle) { if(!handle->curl) { curl_global_init(CURL_GLOBAL_SSL); handle->curl = curl_easy_init(); } return handle->curl; } enum { ABORT_SIGINT = 1, ABORT_OVER_MAXFILESIZE }; static int dload_interrupted; static void inthandler(int UNUSED signum) { dload_interrupted = ABORT_SIGINT; } static int curl_progress(void *file, double dltotal, double dlnow, double UNUSED ultotal, double UNUSED ulnow) { struct dload_payload *payload = (struct dload_payload *)file; off_t current_size, total_size; /* SIGINT sent, abort by alerting curl */ if(dload_interrupted) { return 1; } current_size = payload->initial_size + (off_t)dlnow; /* is our filesize still under any set limit? */ if(payload->max_size && current_size > payload->max_size) { dload_interrupted = ABORT_OVER_MAXFILESIZE; return 1; } /* none of what follows matters if the front end has no callback */ if(payload->handle->dlcb == NULL) { return 0; } total_size = payload->initial_size + (off_t)dltotal; if(DOUBLE_EQ(dltotal, 0.0) || payload->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(payload->prevprogress == 0) { payload->handle->dlcb(payload->remote_name, 0, (off_t)dltotal); } payload->handle->dlcb(payload->remote_name, current_size, total_size); payload->prevprogress = current_size; return 0; } static int curl_gethost(const char *url, char *buffer, size_t buf_len) { size_t hostlen; char *p, *q; if(strncmp(url, "file://", 7) == 0) { p = _("disk"); hostlen = strlen(p); } else { p = strstr(url, "//"); if(!p) { return 1; } p += 2; /* jump over the found // */ hostlen = strcspn(p, "/"); /* there might be a user:pass@ on the URL. hide it. avoid using memrchr() * for portability concerns. */ q = p + hostlen; while(--q > p) { if(*q == '@') { break; } } if(*q == '@' && p != q) { hostlen -= q - p + 1; p = q + 1; } } if(hostlen > buf_len - 1) { /* buffer overflow imminent */ return 1; } memcpy(buffer, p, hostlen); buffer[hostlen] = '\0'; 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; } /* prefix to avoid possible future clash with getumask(3) */ static mode_t _getumask(void) { mode_t mask = umask(0); umask(mask); return mask; } 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->content_disp_name, fptr, endptr - fptr + 1, RET_ERR(payload->handle, ALPM_ERR_MEMORY, realsize)); } } return realsize; } static void curl_set_handle_opts(struct dload_payload *payload, CURL *curl, char *error_buffer) { alpm_handle_t *handle = payload->handle; const char *useragent = getenv("HTTP_USER_AGENT"); struct stat st; /* the curl_easy handle is initialized with the alpm handle, so we only need * to reset the handle's parameters for each time it's used. */ curl_easy_reset(curl); curl_easy_setopt(curl, CURLOPT_URL, payload->fileurl); curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1L); curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, error_buffer); curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 10L); curl_easy_setopt(curl, CURLOPT_FILETIME, 1L); curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L); curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L); curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, curl_progress); curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, (void *)payload); curl_easy_setopt(curl, CURLOPT_LOW_SPEED_LIMIT, 1024L); curl_easy_setopt(curl, CURLOPT_LOW_SPEED_TIME, 10L); curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, parse_headers); curl_easy_setopt(curl, CURLOPT_WRITEHEADER, (void *)payload); curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL); _alpm_log(handle, ALPM_LOG_DEBUG, "url: %s\n", payload->fileurl); if(payload->max_size) { _alpm_log(handle, ALPM_LOG_DEBUG, "maxsize: %jd\n", (intmax_t)payload->max_size); curl_easy_setopt(curl, CURLOPT_MAXFILESIZE_LARGE, (curl_off_t)payload->max_size); } if(useragent != NULL) { curl_easy_setopt(curl, CURLOPT_USERAGENT, useragent); } if(!payload->allow_resume && !payload->force && payload->destfile_name && stat(payload->destfile_name, &st) == 0) { /* start from scratch, but only download if our local is out of date. */ curl_easy_setopt(curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE); curl_easy_setopt(curl, CURLOPT_TIMEVALUE, (long)st.st_mtime); _alpm_log(handle, ALPM_LOG_DEBUG, "using time condition: %lu\n", (long)st.st_mtime); } else if(stat(payload->tempfile_name, &st) == 0 && payload->allow_resume) { /* a previous partial download exists, resume from end of file. */ payload->tempfile_openmode = "ab"; curl_easy_setopt(curl, CURLOPT_RESUME_FROM_LARGE, (curl_off_t)st.st_size); _alpm_log(handle, ALPM_LOG_DEBUG, "tempfile found, attempting continuation from %jd bytes\n", (intmax_t)st.st_size); payload->initial_size = st.st_size; } } static void mask_signal(int signal, void (*handler)(int), struct sigaction *origaction) { struct sigaction newaction; newaction.sa_handler = handler; sigemptyset(&newaction.sa_mask); newaction.sa_flags = 0; sigaction(signal, NULL, origaction); sigaction(signal, &newaction, NULL); } static void unmask_signal(int signal, struct sigaction sa) { sigaction(signal, &sa, NULL); } static FILE *create_tempfile(struct dload_payload *payload, const char *localpath) { int fd; FILE *fp; char *randpath; size_t len; /* create a random filename, which is opened with O_EXCL */ len = strlen(localpath) + 14 + 1; MALLOC(randpath, len, RET_ERR(payload->handle, ALPM_ERR_MEMORY, NULL)); snprintf(randpath, len, "%salpmtmp.XXXXXX", localpath); if((fd = mkstemp(randpath)) == -1 || fchmod(fd, ~(_getumask()) & 0666) || !(fp = fdopen(fd, payload->tempfile_openmode))) { unlink(randpath); CLOSE(fd); _alpm_log(payload->handle, ALPM_LOG_ERROR, _("failed to create temporary file for download\n")); return NULL; } /* fp now points to our alpmtmp.XXXXXX */ free(payload->tempfile_name); payload->tempfile_name = randpath; free(payload->remote_name); STRDUP(payload->remote_name, strrchr(randpath, '/') + 1, RET_ERR(payload->handle, ALPM_ERR_MEMORY, NULL)); return fp; } /* RFC1123 states applications should support this length */ #define HOSTNAME_SIZE 256 static int curl_download_internal(struct dload_payload *payload, const char *localpath, char **final_file) { int ret = -1; FILE *localf = NULL; char *effective_url; char hostname[HOSTNAME_SIZE]; char error_buffer[CURL_ERROR_SIZE] = {0}; struct stat st; long timecond, respcode = 0, remote_time = -1; double remote_size, bytes_dl; struct sigaction orig_sig_pipe, orig_sig_int; /* shortcut to our handle within the payload */ alpm_handle_t *handle = payload->handle; CURL *curl = get_libcurl_handle(handle); handle->pm_errno = 0; payload->tempfile_openmode = "wb"; if(!payload->remote_name) { STRDUP(payload->remote_name, get_filename(payload->fileurl), RET_ERR(handle, ALPM_ERR_MEMORY, -1)); } if(curl_gethost(payload->fileurl, hostname, sizeof(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->remote_name) > 0 && strcmp(payload->remote_name, ".sig") != 0) { payload->destfile_name = get_fullpath(localpath, payload->remote_name, ""); payload->tempfile_name = get_fullpath(localpath, payload->remote_name, ".part"); if(!payload->destfile_name || !payload->tempfile_name) { goto cleanup; } } else { /* URL doesn't contain a filename, so make a tempfile. We can't support * resuming this kind of download; partial transfers will be destroyed */ payload->unlink_on_fail = 1; localf = create_tempfile(payload, localpath); if(localf == NULL) { goto cleanup; } } curl_set_handle_opts(payload, curl, error_buffer); if(localf == NULL) { localf = fopen(payload->tempfile_name, payload->tempfile_openmode); if(localf == NULL) { goto cleanup; } } _alpm_log(handle, ALPM_LOG_DEBUG, "opened tempfile for download: %s (%s)\n", payload->tempfile_name, payload->tempfile_openmode); curl_easy_setopt(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. */ mask_signal(SIGPIPE, SIG_IGN, &orig_sig_pipe); mask_signal(SIGINT, &inthandler, &orig_sig_int); /* perform transfer */ payload->curlerr = curl_easy_perform(curl); /* disconnect relationships from the curl handle for things that might go out * of scope, but could still be touched on connection teardown. This really * only applies to FTP transfers. See FS#26327 for an example. */ curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1L); curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, (char *)NULL); /* was it a success? */ switch(payload->curlerr) { case CURLE_OK: /* get http/ftp response code */ curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &respcode); _alpm_log(handle, ALPM_LOG_DEBUG, "response code: %ld\n", respcode); if(respcode >= 400) { payload->unlink_on_fail = 1; /* non-translated message is same as libcurl */ snprintf(error_buffer, sizeof(error_buffer), "The requested URL returned error: %ld", respcode); _alpm_log(handle, ALPM_LOG_ERROR, _("failed retrieving file '%s' from %s : %s\n"), payload->remote_name, hostname, error_buffer); goto cleanup; } break; case CURLE_ABORTED_BY_CALLBACK: /* handle the interrupt accordingly */ if(dload_interrupted == ABORT_OVER_MAXFILESIZE) { payload->curlerr = CURLE_FILESIZE_EXCEEDED; handle->pm_errno = ALPM_ERR_LIBCURL; /* use the 'size exceeded' message from libcurl */ _alpm_log(handle, ALPM_LOG_ERROR, _("failed retrieving file '%s' from %s : %s\n"), payload->remote_name, hostname, curl_easy_strerror(CURLE_FILESIZE_EXCEEDED)); } goto cleanup; default: /* delete zero length downloads */ if(fstat(fileno(localf), &st) == 0 && st.st_size == 0) { payload->unlink_on_fail = 1; } 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->remote_name, hostname, error_buffer); } else { _alpm_log(handle, ALPM_LOG_DEBUG, "failed retrieving file '%s' from %s : %s\n", payload->remote_name, hostname, error_buffer); } goto cleanup; } /* retrieve info about the state of the transfer */ curl_easy_getinfo(curl, CURLINFO_FILETIME, &remote_time); curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &remote_size); curl_easy_getinfo(curl, CURLINFO_SIZE_DOWNLOAD, &bytes_dl); curl_easy_getinfo(curl, CURLINFO_CONDITION_UNMET, &timecond); curl_easy_getinfo(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)) { _alpm_log(handle, ALPM_LOG_DEBUG, "file met time condition\n"); ret = 1; unlink(payload->tempfile_name); 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->remote_name, (intmax_t)bytes_dl, (intmax_t)remote_size); goto cleanup; } if(payload->content_disp_name) { /* content-disposition header has a better name for our file */ free(payload->destfile_name); payload->destfile_name = get_fullpath(localpath, payload->content_disp_name, ""); } 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(!payload->destfile_name || strcmp(effective_filename, strrchr(payload->destfile_name, '/') + 1) != 0) { free(payload->destfile_name); payload->destfile_name = get_fullpath(localpath, effective_filename, ""); } } } ret = 0; cleanup: if(localf != NULL) { fclose(localf); utimes_long(payload->tempfile_name, remote_time); } if(ret == 0) { const char *realname = payload->tempfile_name; if(payload->destfile_name) { realname = payload->destfile_name; if(rename(payload->tempfile_name, payload->destfile_name)) { _alpm_log(handle, ALPM_LOG_ERROR, _("could not rename %s to %s (%s)\n"), payload->tempfile_name, payload->destfile_name, strerror(errno)); ret = -1; } } if(ret != -1 && final_file) { STRDUP(*final_file, strrchr(realname, '/') + 1, RET_ERR(handle, ALPM_ERR_MEMORY, -1)); } } if((ret == -1 || dload_interrupted) && payload->unlink_on_fail && payload->tempfile_name) { unlink(payload->tempfile_name); } /* restore the old signal handlers */ unmask_signal(SIGINT, orig_sig_int); unmask_signal(SIGPIPE, orig_sig_pipe); /* 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); memset(&payload, 0, sizeof(struct dload_payload)); 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); _alpm_dload_payload_reset(&payload); if(ret == -1) { _alpm_log(handle, ALPM_LOG_WARNING, _("failed to download %s\n"), url); free(final_file); 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; len = strlen(url) + 5; MALLOC(payload.fileurl, len, RET_ERR(handle, ALPM_ERR_MEMORY, NULL)); snprintf(payload.fileurl, len, "%s.sig", url); payload.handle = handle; payload.force = 1; payload.errors_ok = (handle->siglevel & ALPM_SIG_PACKAGE_OPTIONAL); /* set hard upper limit of 16KiB */ payload.max_size = 16 * 1024; ret = _alpm_download(&payload, cachedir, &sig_final_file); if(ret == -1 && !payload.errors_ok) { _alpm_log(handle, ALPM_LOG_WARNING, _("failed to download %s\n"), 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", payload.fileurl); } FREE(sig_final_file); _alpm_dload_payload_reset(&payload); } /* we should be able to find the file the second time around */ filepath = _alpm_filecache_find(handle, final_file); free(final_file); return filepath; } void _alpm_dload_payload_reset(struct dload_payload *payload) { ASSERT(payload, return); FREE(payload->remote_name); FREE(payload->tempfile_name); FREE(payload->destfile_name); FREE(payload->content_disp_name); FREE(payload->fileurl); } /* vim: set ts=2 sw=2 noet: */