/* * util.c * * Copyright (c) 2006-2010 Pacman Development Team <pacman-dev@archlinux.org> * Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org> * Copyright (c) 2005 by Aurelien Foret <orelien@chez.com> * Copyright (c) 2005 by Christian Hamar <krics@linuxforum.hu> * Copyright (c) 2006 by David Kimpe <dnaku@frugalware.org> * Copyright (c) 2005, 2006 by Miklos Vajna <vmiklos@frugalware.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 <stdio.h> #include <stdlib.h> #include <stdarg.h> #include <string.h> #include <fcntl.h> #include <unistd.h> #include <ctype.h> #include <dirent.h> #include <time.h> #include <syslog.h> #include <errno.h> #include <sys/types.h> #include <sys/stat.h> #include <sys/wait.h> /* libarchive */ #include <archive.h> #include <archive_entry.h> #ifdef HAVE_LIBSSL #include <openssl/md5.h> #else #include "md5.h" #endif /* libalpm */ #include "util.h" #include "log.h" #include "package.h" #include "alpm.h" #include "alpm_list.h" #include "handle.h" #ifndef HAVE_STRSEP /* This is a replacement for strsep which is not portable (missing on Solaris). * Copyright (c) 2001 by François Gouget <fgouget_at_codeweavers.com> */ char* strsep(char** str, const char* delims) { char* token; if (*str==NULL) { /* No more tokens */ return NULL; } token=*str; while (**str!='\0') { if (strchr(delims,**str)!=NULL) { **str='\0'; (*str)++; return token; } (*str)++; } /* There is no other token */ *str=NULL; return token; } #endif int _alpm_makepath(const char *path) { return(_alpm_makepath_mode(path, 0755)); } /* does the same thing as 'mkdir -p' */ int _alpm_makepath_mode(const char *path, mode_t mode) { /* A bit of pointer hell here. Descriptions: * orig - a copy of path so we can safely butcher it with strsep * str - the current position in the path string (after the delimiter) * ptr - the original position of str after calling strsep * incr - incrementally generated path for use in stat/mkdir call */ char *orig, *str, *ptr, *incr; mode_t oldmask = umask(0000); int ret = 0; orig = strdup(path); incr = calloc(strlen(orig) + 1, sizeof(char)); str = orig; while((ptr = strsep(&str, "/"))) { if(strlen(ptr)) { /* we have another path component- append the newest component to * existing string and create one more level of dir structure */ strcat(incr, "/"); strcat(incr, ptr); if(access(incr, F_OK)) { if(mkdir(incr, mode)) { ret = 1; break; } } } } free(orig); free(incr); umask(oldmask); return(ret); } #define CPBUFSIZE 8 * 1024 int _alpm_copyfile(const char *src, const char *dest) { FILE *in, *out; size_t len; char *buf; int ret = 0; in = fopen(src, "rb"); if(in == NULL) { return(1); } out = fopen(dest, "wb"); if(out == NULL) { fclose(in); return(1); } CALLOC(buf, (size_t)CPBUFSIZE, (size_t)1, ret = 1; goto cleanup;); /* do the actual file copy */ while((len = fread(buf, 1, CPBUFSIZE, in))) { size_t nwritten = 0; nwritten = fwrite(buf, 1, len, out); if((nwritten != len) || ferror(out)) { pm_errno = PM_ERR_WRITE; _alpm_log(PM_LOG_ERROR, _("error writing to file '%s': %s\n"), dest, strerror(errno)); ret = -1; goto cleanup; } } /* chmod dest to permissions of src, as long as it is not a symlink */ struct stat statbuf; if(!stat(src, &statbuf)) { if(! S_ISLNK(statbuf.st_mode)) { fchmod(fileno(out), statbuf.st_mode); } } else { /* stat was unsuccessful */ ret = 1; } cleanup: fclose(in); fclose(out); FREE(buf); return(ret); } /* Trim whitespace and newlines from a string */ char *_alpm_strtrim(char *str) { char *pch = str; if(*str == '\0') { /* string is empty, so we're done. */ return(str); } while(isspace((unsigned char)*pch)) { pch++; } if(pch != str) { memmove(str, pch, (strlen(pch) + 1)); } /* check if there wasn't anything but whitespace in the string. */ if(*str == '\0') { return(str); } pch = (str + (strlen(str) - 1)); while(isspace((unsigned char)*pch)) { pch--; } *++pch = '\0'; return(str); } /* Create a lock file */ int _alpm_lckmk() { int fd; char *dir, *ptr; const char *file = alpm_option_get_lockfile(); /* create the dir of the lockfile first */ dir = strdup(file); ptr = strrchr(dir, '/'); if(ptr) { *ptr = '\0'; } _alpm_makepath(dir); FREE(dir); do { fd = open(file, O_WRONLY | O_CREAT | O_EXCL, 0000); } while (fd == -1 && errno == EINTR); if(fd > 0) { FILE *f = fdopen(fd, "w"); fprintf(f, "%ld\n", (long)getpid()); fflush(f); fsync(fd); fclose(f); return(fd); } return(-1); } /* Remove a lock file */ int _alpm_lckrm() { const char *file = alpm_option_get_lockfile(); if(unlink(file) == -1 && errno != ENOENT) { return(-1); } return(0); } /* Compression functions */ /** * @brief Unpack a specific file in an archive. * * @param archive the archive to unpack * @param prefix where to extract the files * @param fn a file within the archive to unpack * @return 0 on success, 1 on failure */ int _alpm_unpack_single(const char *archive, const char *prefix, const char *fn) { alpm_list_t *list = NULL; int ret = 0; if(fn == NULL) { return(1); } list = alpm_list_add(list, (void *)fn); ret = _alpm_unpack(archive, prefix, list, 1); alpm_list_free(list); return(ret); } /** * @brief Unpack a list of files in an archive. * * @param archive the archive to unpack * @param prefix where to extract the files * @param list a list of files within the archive to unpack or * NULL for all * @param breakfirst break after the first entry found * * @return 0 on success, 1 on failure */ int _alpm_unpack(const char *archive, const char *prefix, alpm_list_t *list, int breakfirst) { int ret = 0; mode_t oldmask; struct archive *_archive; struct archive_entry *entry; char cwd[PATH_MAX]; int restore_cwd = 0; ALPM_LOG_FUNC; if((_archive = archive_read_new()) == NULL) RET_ERR(PM_ERR_LIBARCHIVE, 1); archive_read_support_compression_all(_archive); archive_read_support_format_all(_archive); if(archive_read_open_filename(_archive, archive, ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) { _alpm_log(PM_LOG_ERROR, _("could not open %s: %s\n"), archive, archive_error_string(_archive)); RET_ERR(PM_ERR_PKG_OPEN, 1); } oldmask = umask(0022); /* save the cwd so we can restore it later */ if(getcwd(cwd, PATH_MAX) == NULL) { _alpm_log(PM_LOG_ERROR, _("could not get current working directory\n")); } else { restore_cwd = 1; } /* just in case our cwd was removed in the upgrade operation */ if(chdir(prefix) != 0) { _alpm_log(PM_LOG_ERROR, _("could not change directory to %s (%s)\n"), prefix, strerror(errno)); ret = 1; goto cleanup; } while(archive_read_next_header(_archive, &entry) == ARCHIVE_OK) { const struct stat *st; const char *entryname; /* the name of the file in the archive */ st = archive_entry_stat(entry); entryname = archive_entry_pathname(entry); if(S_ISREG(st->st_mode)) { archive_entry_set_perm(entry, 0644); } else if(S_ISDIR(st->st_mode)) { archive_entry_set_perm(entry, 0755); } /* If specific files were requested, skip entries that don't match. */ if(list) { char *prefix = strdup(entryname); char *p = strstr(prefix,"/"); if(p) { *(p+1) = '\0'; } char *found = alpm_list_find_str(list, prefix); free(prefix); if(!found) { if (archive_read_data_skip(_archive) != ARCHIVE_OK) { ret = 1; goto cleanup; } continue; } else { _alpm_log(PM_LOG_DEBUG, "extracting: %s\n", entryname); } } /* Extract the archive entry. */ int readret = archive_read_extract(_archive, entry, 0); if(readret == ARCHIVE_WARN) { /* operation succeeded but a non-critical error was encountered */ _alpm_log(PM_LOG_DEBUG, "warning extracting %s (%s)\n", entryname, archive_error_string(_archive)); } else if(readret != ARCHIVE_OK) { _alpm_log(PM_LOG_ERROR, _("could not extract %s (%s)\n"), entryname, archive_error_string(_archive)); ret = 1; goto cleanup; } if(breakfirst) { break; } } cleanup: umask(oldmask); archive_read_finish(_archive); if(restore_cwd && chdir(cwd) != 0) { _alpm_log(PM_LOG_ERROR, _("could not change directory to %s (%s)\n"), cwd, strerror(errno)); } return(ret); } /* does the same thing as 'rm -rf' */ int _alpm_rmrf(const char *path) { int errflag = 0; struct dirent *dp; DIR *dirp; char name[PATH_MAX]; struct stat st; if(_alpm_lstat(path, &st) == 0) { if(!S_ISDIR(st.st_mode)) { if(!unlink(path)) { return(0); } else { if(errno == ENOENT) { return(0); } else { return(1); } } } else { dirp = opendir(path); if(!dirp) { return(1); } for(dp = readdir(dirp); dp != NULL; dp = readdir(dirp)) { if(dp->d_ino) { sprintf(name, "%s/%s", path, dp->d_name); if(strcmp(dp->d_name, "..") != 0 && strcmp(dp->d_name, ".") != 0) { errflag += _alpm_rmrf(name); } } } closedir(dirp); if(rmdir(path)) { errflag++; } } return(errflag); } return(0); } int _alpm_logaction(int usesyslog, FILE *f, const char *fmt, va_list args) { int ret = 0; if(usesyslog) { /* we can't use a va_list more than once, so we need to copy it * so we can use the original when calling vfprintf below. */ va_list args_syslog; va_copy(args_syslog, args); vsyslog(LOG_WARNING, fmt, args_syslog); va_end(args_syslog); } if(f) { time_t t; struct tm *tm; t = time(NULL); tm = localtime(&t); /* Use ISO-8601 date format */ fprintf(f, "[%04d-%02d-%02d %02d:%02d] ", tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday, tm->tm_hour, tm->tm_min); ret = vfprintf(f, fmt, args); fflush(f); } return(ret); } int _alpm_run_chroot(const char *root, const char *path, char *const argv[]) { char cwd[PATH_MAX]; pid_t pid; int pipefd[2]; int restore_cwd = 0; int retval = 0; ALPM_LOG_FUNC; /* save the cwd so we can restore it later */ if(getcwd(cwd, PATH_MAX) == NULL) { _alpm_log(PM_LOG_ERROR, _("could not get current working directory\n")); } else { restore_cwd = 1; } /* just in case our cwd was removed in the upgrade operation */ if(chdir(root) != 0) { _alpm_log(PM_LOG_ERROR, _("could not change directory to %s (%s)\n"), root, strerror(errno)); goto cleanup; } _alpm_log(PM_LOG_DEBUG, "executing \"%s\" under chroot \"%s\"\n", path, root); /* Flush open fds before fork() to avoid cloning buffers */ fflush(NULL); if(pipe(pipefd) == -1) { _alpm_log(PM_LOG_ERROR, _("could not create pipe (%s)\n"), strerror(errno)); retval = 1; goto cleanup; } /* fork- parent and child each have seperate code blocks below */ pid = fork(); if(pid == -1) { _alpm_log(PM_LOG_ERROR, _("could not fork a new process (%s)\n"), strerror(errno)); retval = 1; goto cleanup; } if(pid == 0) { /* this code runs for the child only (the actual chroot/exec) */ close(1); close(2); while(dup2(pipefd[1], 1) == -1 && errno == EINTR); while(dup2(pipefd[1], 2) == -1 && errno == EINTR); close(pipefd[0]); close(pipefd[1]); /* use fprintf instead of _alpm_log to send output through the parent */ if(chroot(root) != 0) { fprintf(stderr, _("could not change the root directory (%s)\n"), strerror(errno)); exit(1); } if(chdir("/") != 0) { fprintf(stderr, _("could not change directory to / (%s)\n"), strerror(errno)); exit(1); } umask(0022); execv(path, argv); fprintf(stderr, _("call to execv failed (%s)\n"), strerror(errno)); exit(1); } else { /* this code runs for the parent only (wait on the child) */ int status; FILE *pipe; close(pipefd[1]); pipe = fdopen(pipefd[0], "r"); if(pipe == NULL) { close(pipefd[0]); retval = 1; } else { while(!feof(pipe)) { char line[PATH_MAX]; if(fgets(line, PATH_MAX, pipe) == NULL) break; alpm_logaction("%s", line); EVENT(handle->trans, PM_TRANS_EVT_SCRIPTLET_INFO, line, NULL); } fclose(pipe); } while(waitpid(pid, &status, 0) == -1) { if(errno != EINTR) { _alpm_log(PM_LOG_ERROR, _("call to waitpid failed (%s)\n"), strerror(errno)); retval = 1; goto cleanup; } } /* report error from above after the child has exited */ if(retval != 0) { _alpm_log(PM_LOG_ERROR, _("could not open pipe (%s)\n"), strerror(errno)); goto cleanup; } /* check the return status, make sure it is 0 (success) */ if(WIFEXITED(status)) { _alpm_log(PM_LOG_DEBUG, "call to waitpid succeeded\n"); if(WEXITSTATUS(status) != 0) { _alpm_log(PM_LOG_ERROR, _("command failed to execute correctly\n")); retval = 1; } } } cleanup: if(restore_cwd && chdir(cwd) != 0) { _alpm_log(PM_LOG_ERROR, _("could not change directory to %s (%s)\n"), cwd, strerror(errno)); } return(retval); } int _alpm_ldconfig(const char *root) { char line[PATH_MAX]; _alpm_log(PM_LOG_DEBUG, "running ldconfig\n"); snprintf(line, PATH_MAX, "%setc/ld.so.conf", root); if(access(line, F_OK) == 0) { snprintf(line, PATH_MAX, "%ssbin/ldconfig", root); if(access(line, X_OK) == 0) { char *argv[] = { "ldconfig", NULL }; _alpm_run_chroot(root, "/sbin/ldconfig", argv); } } return(0); } /* Helper function for comparing strings using the * alpm "compare func" signature */ int _alpm_str_cmp(const void *s1, const void *s2) { return(strcmp(s1, s2)); } /** Find a filename in a registered alpm cachedir. * @param filename name of file to find * @return malloced path of file, NULL if not found */ char *_alpm_filecache_find(const char* filename) { char path[PATH_MAX]; char *retpath; alpm_list_t *i; /* Loop through the cache dirs until we find a matching file */ for(i = alpm_option_get_cachedirs(); i; i = alpm_list_next(i)) { snprintf(path, PATH_MAX, "%s%s", (char*)alpm_list_getdata(i), filename); if(access(path, R_OK) == 0) { retpath = strdup(path); _alpm_log(PM_LOG_DEBUG, "found cached pkg: %s\n", retpath); return(retpath); } } /* package wasn't found in any cachedir */ return(NULL); } /** Check the alpm cachedirs for existance and find a writable one. * If no valid cache directory can be found, use /tmp. * @return pointer to a writable cache directory. */ const char *_alpm_filecache_setup(void) { struct stat buf; alpm_list_t *i, *tmp; char *cachedir; /* Loop through the cache dirs until we find a writeable dir */ for(i = alpm_option_get_cachedirs(); i; i = alpm_list_next(i)) { cachedir = alpm_list_getdata(i); if(stat(cachedir, &buf) != 0) { /* cache directory does not exist.... try creating it */ _alpm_log(PM_LOG_WARNING, _("no %s cache exists, creating...\n"), cachedir); if(_alpm_makepath(cachedir) == 0) { _alpm_log(PM_LOG_DEBUG, "using cachedir: %s\n", cachedir); return(cachedir); } } else if(S_ISDIR(buf.st_mode) && (buf.st_mode & S_IWUSR)) { _alpm_log(PM_LOG_DEBUG, "using cachedir: %s\n", cachedir); return(cachedir); } } /* we didn't find a valid cache directory. use /tmp. */ tmp = alpm_list_add(NULL, strdup("/tmp/")); alpm_option_set_cachedirs(tmp); _alpm_log(PM_LOG_DEBUG, "using cachedir: %s", "/tmp/\n"); _alpm_log(PM_LOG_WARNING, _("couldn't create package cache, using /tmp instead\n")); return(alpm_list_getdata(tmp)); } /** lstat wrapper that treats /path/dirsymlink/ the same as /path/dirsymlink. * Linux lstat follows POSIX semantics and still performs a dereference on * the first, and for uses of lstat in libalpm this is not what we want. * @param path path to file to lstat * @param buf structure to fill with stat information * @return the return code from lstat */ int _alpm_lstat(const char *path, struct stat *buf) { int ret; char *newpath = strdup(path); int len = strlen(newpath); /* strip the trailing slash if one exists */ if(len != 0 && newpath[len - 1] == '/') { newpath[len - 1] = '\0'; } ret = lstat(newpath, buf); FREE(newpath); return(ret); } #ifdef HAVE_LIBSSL static int md5_file(const char *path, unsigned char output[16]) { FILE *f; size_t n; MD5_CTX ctx; unsigned char *buf; CALLOC(buf, 8192, sizeof(unsigned char), return(1)); if((f = fopen(path, "rb")) == NULL) { free(buf); return(1); } MD5_Init(&ctx); while((n = fread(buf, 1, sizeof(buf), f)) > 0) { MD5_Update(&ctx, buf, n); } MD5_Final(output, &ctx); memset(&ctx, 0, sizeof(MD5_CTX)); free(buf); if(ferror(f) != 0) { fclose(f); return(2); } fclose(f); return(0); } #endif /** Get the md5 sum of file. * @param filename name of the file * @return the checksum on success, NULL on error * @addtogroup alpm_misc */ char SYMEXPORT *alpm_compute_md5sum(const char *filename) { unsigned char output[16]; char *md5sum; int ret, i; ALPM_LOG_FUNC; ASSERT(filename != NULL, return(NULL)); /* allocate 32 chars plus 1 for null */ md5sum = calloc(33, sizeof(char)); /* defined above for OpenSSL, otherwise defined in md5.h */ ret = md5_file(filename, output); if (ret > 0) { RET_ERR(PM_ERR_NOT_A_FILE, NULL); } /* Convert the result to something readable */ for (i = 0; i < 16; i++) { /* sprintf is acceptable here because we know our output */ sprintf(md5sum +(i * 2), "%02x", output[i]); } md5sum[32] = '\0'; _alpm_log(PM_LOG_DEBUG, "md5(%s) = %s\n", filename, md5sum); return(md5sum); } int _alpm_test_md5sum(const char *filepath, const char *md5sum) { char *md5sum2; int ret; md5sum2 = alpm_compute_md5sum(filepath); if(md5sum == NULL || md5sum2 == NULL) { ret = -1; } else if(strcmp(md5sum, md5sum2) != 0) { ret = 1; } else { ret = 0; } FREE(md5sum2); return(ret); } char *_alpm_archive_fgets(char *line, size_t size, struct archive *a) { /* for now, just read one char at a time until we get to a * '\n' char. we can optimize this later with an internal * buffer. */ /* leave room for zero terminator */ char *last = line + size - 1; char *i; for(i = line; i < last; i++) { int ret = archive_read_data(a, i, 1); /* special check for first read- if null, return null, * this indicates EOF */ if(i == line && (ret <= 0 || *i == '\0')) { return(NULL); } /* check if read value was null or newline */ if(ret <= 0 || *i == '\0' || *i == '\n') { last = i + 1; break; } } /* always null terminate the buffer */ *last = '\0'; return(line); } int _alpm_splitname(const char *target, pmpkg_t *pkg) { /* the format of a db entry is as follows: * package-version-rel/ * package name can contain hyphens, so parse from the back- go back * two hyphens and we have split the version from the name. */ char *tmp, *p, *q; if(target == NULL || pkg == NULL) { return(-1); } STRDUP(tmp, target, RET_ERR(PM_ERR_MEMORY, -1)); p = tmp + strlen(tmp); /* remove any trailing '/' */ while (*(p - 1) == '/') { --p; *p = '\0'; } /* do the magic parsing- find the beginning of the version string * by doing two iterations of same loop to lop off two hyphens */ for(q = --p; *q && *q != '-'; q--); for(p = --q; *p && *p != '-'; p--); if(*p != '-' || p == tmp) { return(-1); } /* copy into fields and return */ if(pkg->version) { FREE(pkg->version); } STRDUP(pkg->version, p+1, RET_ERR(PM_ERR_MEMORY, -1)); /* insert a terminator at the end of the name (on hyphen)- then copy it */ *p = '\0'; if(pkg->name) { FREE(pkg->name); } STRDUP(pkg->name, tmp, RET_ERR(PM_ERR_MEMORY, -1)); free(tmp); return(0); } /* vim: set ts=2 sw=2 noet: */