X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Futils.c;h=eebed2adb71934800c5f0f49b42c6277817fa8e1;hp=1d07cb31cc01511aedb781124de609277410075d;hb=HEAD;hpb=c9d424071aa532aa287fa86cfe02edbeded50e7b diff --git a/src/common/utils.c b/src/common/utils.c deleted file mode 100644 index 1d07cb31c..000000000 --- a/src/common/utils.c +++ /dev/null @@ -1,1037 +0,0 @@ -/* - * Copyright (C) 2012 - David Goulet - * Copyright (C) 2013 - Raphaël Beamonte - * Copyright (C) 2013 - Jérémie Galarneau - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License, version 2 only, as - * published by the Free Software Foundation. - * - * 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, write to the Free Software Foundation, Inc., 51 - * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#define _GNU_SOURCE -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include - -#include "utils.h" -#include "defaults.h" - -/* - * Return a partial realpath(3) of the path even if the full path does not - * exist. For instance, with /tmp/test1/test2/test3, if test2/ does not exist - * but the /tmp/test1 does, the real path for /tmp/test1 is concatened with - * /test2/test3 then returned. In normal time, realpath(3) fails if the end - * point directory does not exist. - * In case resolved_path is NULL, the string returned was allocated in the - * function and thus need to be freed by the caller. The size argument allows - * to specify the size of the resolved_path argument if given, or the size to - * allocate. - */ -LTTNG_HIDDEN -char *utils_partial_realpath(const char *path, char *resolved_path, size_t size) -{ - char *cut_path, *try_path = NULL, *try_path_prev = NULL; - const char *next, *prev, *end; - - /* Safety net */ - if (path == NULL) { - goto error; - } - - /* - * Identify the end of the path, we don't want to treat the - * last char if it is a '/', we will just keep it on the side - * to be added at the end, and return a value coherent with - * the path given as argument - */ - end = path + strlen(path); - if (*(end-1) == '/') { - end--; - } - - /* Initiate the values of the pointers before looping */ - next = path; - prev = next; - /* Only to ensure try_path is not NULL to enter the while */ - try_path = (char *)next; - - /* Resolve the canonical path of the first part of the path */ - while (try_path != NULL && next != end) { - /* - * If there is not any '/' left, we want to try with - * the full path - */ - next = strpbrk(next + 1, "/"); - if (next == NULL) { - next = end; - } - - /* Cut the part we will be trying to resolve */ - cut_path = strndup(path, next - path); - - /* Try to resolve this part */ - try_path = realpath((char *)cut_path, NULL); - if (try_path == NULL) { - /* - * There was an error, we just want to be assured it - * is linked to an unexistent directory, if it's another - * reason, we spawn an error - */ - switch (errno) { - case ENOENT: - /* Ignore the error */ - break; - default: - PERROR("realpath (partial_realpath)"); - goto error; - break; - } - } else { - /* Save the place we are before trying the next step */ - free(try_path_prev); - try_path_prev = try_path; - prev = next; - } - - /* Free the allocated memory */ - free(cut_path); - }; - - /* Allocate memory for the resolved path if necessary */ - if (resolved_path == NULL) { - resolved_path = zmalloc(size); - if (resolved_path == NULL) { - PERROR("zmalloc resolved path"); - goto error; - } - } - - /* - * If we were able to solve at least partially the path, we can concatenate - * what worked and what didn't work - */ - if (try_path_prev != NULL) { - /* If we risk to concatenate two '/', we remove one of them */ - if (try_path_prev[strlen(try_path_prev) - 1] == '/' && prev[0] == '/') { - try_path_prev[strlen(try_path_prev) - 1] = '\0'; - } - - /* - * Duplicate the memory used by prev in case resolved_path and - * path are pointers for the same memory space - */ - cut_path = strdup(prev); - - /* Concatenate the strings */ - snprintf(resolved_path, size, "%s%s", try_path_prev, cut_path); - - /* Free the allocated memory */ - free(cut_path); - free(try_path_prev); - /* - * Else, we just copy the path in our resolved_path to - * return it as is - */ - } else { - strncpy(resolved_path, path, size); - } - - /* Then we return the 'partially' resolved path */ - return resolved_path; - -error: - free(resolved_path); - return NULL; -} - -/* - * Make a full resolution of the given path even if it doesn't exist. - * This function uses the utils_partial_realpath function to resolve - * symlinks and relatives paths at the start of the string, and - * implements functionnalities to resolve the './' and '../' strings - * in the middle of a path. This function is only necessary because - * realpath(3) does not accept to resolve unexistent paths. - * The returned string was allocated in the function, it is thus of - * the responsibility of the caller to free this memory. - */ -LTTNG_HIDDEN -char *utils_expand_path(const char *path) -{ - char *next, *previous, *slash, *start_path, *absolute_path = NULL; - char *last_token; - int is_dot, is_dotdot; - - /* Safety net */ - if (path == NULL) { - goto error; - } - - /* Allocate memory for the absolute_path */ - absolute_path = zmalloc(PATH_MAX); - if (absolute_path == NULL) { - PERROR("zmalloc expand path"); - goto error; - } - - /* - * If the path is not already absolute nor explicitly relative, - * consider we're in the current directory - */ - if (*path != '/' && strncmp(path, "./", 2) != 0 && - strncmp(path, "../", 3) != 0) { - snprintf(absolute_path, PATH_MAX, "./%s", path); - /* Else, we just copy the path */ - } else { - strncpy(absolute_path, path, PATH_MAX); - } - - /* Resolve partially our path */ - absolute_path = utils_partial_realpath(absolute_path, - absolute_path, PATH_MAX); - - /* As long as we find '/./' in the working_path string */ - while ((next = strstr(absolute_path, "/./"))) { - - /* We prepare the start_path not containing it */ - start_path = strndup(absolute_path, next - absolute_path); - - /* And we concatenate it with the part after this string */ - snprintf(absolute_path, PATH_MAX, "%s%s", start_path, next + 2); - - free(start_path); - } - - /* As long as we find '/../' in the working_path string */ - while ((next = strstr(absolute_path, "/../"))) { - /* We find the last level of directory */ - previous = absolute_path; - while ((slash = strpbrk(previous, "/")) && slash != next) { - previous = slash + 1; - } - - /* Then we prepare the start_path not containing it */ - start_path = strndup(absolute_path, previous - absolute_path); - - /* And we concatenate it with the part after the '/../' */ - snprintf(absolute_path, PATH_MAX, "%s%s", start_path, next + 4); - - /* We can free the memory used for the start path*/ - free(start_path); - - /* Then we verify for symlinks using partial_realpath */ - absolute_path = utils_partial_realpath(absolute_path, - absolute_path, PATH_MAX); - } - - /* Identify the last token */ - last_token = strrchr(absolute_path, '/'); - - /* Verify that this token is not a relative path */ - is_dotdot = (strcmp(last_token, "/..") == 0); - is_dot = (strcmp(last_token, "/.") == 0); - - /* If it is, take action */ - if (is_dot || is_dotdot) { - /* For both, remove this token */ - *last_token = '\0'; - - /* If it was a reference to parent directory, go back one more time */ - if (is_dotdot) { - last_token = strrchr(absolute_path, '/'); - - /* If there was only one level left, we keep the first '/' */ - if (last_token == absolute_path) { - last_token++; - } - - *last_token = '\0'; - } - } - - return absolute_path; - -error: - free(absolute_path); - return NULL; -} - -/* - * Create a pipe in dst. - */ -LTTNG_HIDDEN -int utils_create_pipe(int *dst) -{ - int ret; - - if (dst == NULL) { - return -1; - } - - ret = pipe(dst); - if (ret < 0) { - PERROR("create pipe"); - } - - return ret; -} - -/* - * Create pipe and set CLOEXEC flag to both fd. - * - * Make sure the pipe opened by this function are closed at some point. Use - * utils_close_pipe(). - */ -LTTNG_HIDDEN -int utils_create_pipe_cloexec(int *dst) -{ - int ret, i; - - if (dst == NULL) { - return -1; - } - - ret = utils_create_pipe(dst); - if (ret < 0) { - goto error; - } - - for (i = 0; i < 2; i++) { - ret = fcntl(dst[i], F_SETFD, FD_CLOEXEC); - if (ret < 0) { - PERROR("fcntl pipe cloexec"); - goto error; - } - } - -error: - return ret; -} - -/* - * Create pipe and set fd flags to FD_CLOEXEC and O_NONBLOCK. - * - * Make sure the pipe opened by this function are closed at some point. Use - * utils_close_pipe(). Using pipe() and fcntl rather than pipe2() to - * support OSes other than Linux 2.6.23+. - */ -LTTNG_HIDDEN -int utils_create_pipe_cloexec_nonblock(int *dst) -{ - int ret, i; - - if (dst == NULL) { - return -1; - } - - ret = utils_create_pipe(dst); - if (ret < 0) { - goto error; - } - - for (i = 0; i < 2; i++) { - ret = fcntl(dst[i], F_SETFD, FD_CLOEXEC); - if (ret < 0) { - PERROR("fcntl pipe cloexec"); - goto error; - } - /* - * Note: we override any flag that could have been - * previously set on the fd. - */ - ret = fcntl(dst[i], F_SETFL, O_NONBLOCK); - if (ret < 0) { - PERROR("fcntl pipe nonblock"); - goto error; - } - } - -error: - return ret; -} - -/* - * Close both read and write side of the pipe. - */ -LTTNG_HIDDEN -void utils_close_pipe(int *src) -{ - int i, ret; - - if (src == NULL) { - return; - } - - for (i = 0; i < 2; i++) { - /* Safety check */ - if (src[i] < 0) { - continue; - } - - ret = close(src[i]); - if (ret) { - PERROR("close pipe"); - } - } -} - -/* - * Create a new string using two strings range. - */ -LTTNG_HIDDEN -char *utils_strdupdelim(const char *begin, const char *end) -{ - char *str; - - str = zmalloc(end - begin + 1); - if (str == NULL) { - PERROR("zmalloc strdupdelim"); - goto error; - } - - memcpy(str, begin, end - begin); - str[end - begin] = '\0'; - -error: - return str; -} - -/* - * Set CLOEXEC flag to the give file descriptor. - */ -LTTNG_HIDDEN -int utils_set_fd_cloexec(int fd) -{ - int ret; - - if (fd < 0) { - ret = -EINVAL; - goto end; - } - - ret = fcntl(fd, F_SETFD, FD_CLOEXEC); - if (ret < 0) { - PERROR("fcntl cloexec"); - ret = -errno; - } - -end: - return ret; -} - -/* - * Create pid file to the given path and filename. - */ -LTTNG_HIDDEN -int utils_create_pid_file(pid_t pid, const char *filepath) -{ - int ret; - FILE *fp; - - assert(filepath); - - fp = fopen(filepath, "w"); - if (fp == NULL) { - PERROR("open pid file %s", filepath); - ret = -1; - goto error; - } - - ret = fprintf(fp, "%d\n", pid); - if (ret < 0) { - PERROR("fprintf pid file"); - } - - fclose(fp); - DBG("Pid %d written in file %s", pid, filepath); -error: - return ret; -} - -/* - * Create lock file to the given path and filename. - * Returns the associated file descriptor, -1 on error. - */ -LTTNG_HIDDEN -int utils_create_lock_file(const char *filepath) -{ - int ret; - int fd; - - assert(filepath); - - fd = open(filepath, O_CREAT, - O_WRONLY | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); - if (fd < 0) { - PERROR("open lock file %s", filepath); - ret = -1; - goto error; - } - - /* - * Attempt to lock the file. If this fails, there is - * already a process using the same lock file running - * and we should exit. - */ - ret = flock(fd, LOCK_EX | LOCK_NB); - if (ret) { - WARN("Could not get lock file %s, another instance is running.", - filepath); - close(fd); - fd = ret; - goto error; - } - -error: - return fd; -} - -/* - * Recursively create directory using the given path and mode. - * - * On success, return 0 else a negative error code. - */ -LTTNG_HIDDEN -int utils_mkdir_recursive(const char *path, mode_t mode) -{ - char *p, tmp[PATH_MAX]; - size_t len; - int ret; - - assert(path); - - ret = snprintf(tmp, sizeof(tmp), "%s", path); - if (ret < 0) { - PERROR("snprintf mkdir"); - goto error; - } - - len = ret; - if (tmp[len - 1] == '/') { - tmp[len - 1] = 0; - } - - for (p = tmp + 1; *p; p++) { - if (*p == '/') { - *p = 0; - if (tmp[strlen(tmp) - 1] == '.' && - tmp[strlen(tmp) - 2] == '.' && - tmp[strlen(tmp) - 3] == '/') { - ERR("Using '/../' is not permitted in the trace path (%s)", - tmp); - ret = -1; - goto error; - } - ret = mkdir(tmp, mode); - if (ret < 0) { - if (errno != EEXIST) { - PERROR("mkdir recursive"); - ret = -errno; - goto error; - } - } - *p = '/'; - } - } - - ret = mkdir(tmp, mode); - if (ret < 0) { - if (errno != EEXIST) { - PERROR("mkdir recursive last piece"); - ret = -errno; - } else { - ret = 0; - } - } - -error: - return ret; -} - -/* - * Create the stream tracefile on disk. - * - * Return 0 on success or else a negative value. - */ -LTTNG_HIDDEN -int utils_create_stream_file(const char *path_name, char *file_name, uint64_t size, - uint64_t count, int uid, int gid, char *suffix) -{ - int ret, out_fd, flags, mode; - char full_path[PATH_MAX], *path_name_suffix = NULL, *path; - char *extra = NULL; - - assert(path_name); - assert(file_name); - - ret = snprintf(full_path, sizeof(full_path), "%s/%s", - path_name, file_name); - if (ret < 0) { - PERROR("snprintf create output file"); - goto error; - } - - /* Setup extra string if suffix or/and a count is needed. */ - if (size > 0 && suffix) { - ret = asprintf(&extra, "_%" PRIu64 "%s", count, suffix); - } else if (size > 0) { - ret = asprintf(&extra, "_%" PRIu64, count); - } else if (suffix) { - ret = asprintf(&extra, "%s", suffix); - } - if (ret < 0) { - PERROR("Allocating extra string to name"); - goto error; - } - - /* - * If we split the trace in multiple files, we have to add the count at the - * end of the tracefile name - */ - if (extra) { - ret = asprintf(&path_name_suffix, "%s%s", full_path, extra); - if (ret < 0) { - PERROR("Allocating path name with extra string"); - goto error_free_suffix; - } - path = path_name_suffix; - } else { - path = full_path; - } - - flags = O_WRONLY | O_CREAT | O_TRUNC; - /* Open with 660 mode */ - mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP; - - if (uid < 0 || gid < 0) { - out_fd = open(path, flags, mode); - } else { - out_fd = run_as_open(path, flags, mode, uid, gid); - } - if (out_fd < 0) { - PERROR("open stream path %s", path); - goto error_open; - } - ret = out_fd; - -error_open: - free(path_name_suffix); -error_free_suffix: - free(extra); -error: - return ret; -} - -/* - * Change the output tracefile according to the given size and count The - * new_count pointer is set during this operation. - * - * From the consumer, the stream lock MUST be held before calling this function - * because we are modifying the stream status. - * - * Return 0 on success or else a negative value. - */ -LTTNG_HIDDEN -int utils_rotate_stream_file(char *path_name, char *file_name, uint64_t size, - uint64_t count, int uid, int gid, int out_fd, uint64_t *new_count, - int *stream_fd) -{ - int ret; - - assert(new_count); - assert(stream_fd); - - ret = close(out_fd); - if (ret < 0) { - PERROR("Closing tracefile"); - goto error; - } - - if (count > 0) { - *new_count = (*new_count + 1) % count; - } else { - (*new_count)++; - } - - ret = utils_create_stream_file(path_name, file_name, size, *new_count, - uid, gid, 0); - if (ret < 0) { - goto error; - } - *stream_fd = ret; - - /* Success. */ - ret = 0; - -error: - return ret; -} - - -/** - * Parse a string that represents a size in human readable format. It - * supports decimal integers suffixed by 'k', 'K', 'M' or 'G'. - * - * The suffix multiply the integer by: - * 'k': 1024 - * 'M': 1024^2 - * 'G': 1024^3 - * - * @param str The string to parse. - * @param size Pointer to a uint64_t that will be filled with the - * resulting size. - * - * @return 0 on success, -1 on failure. - */ -LTTNG_HIDDEN -int utils_parse_size_suffix(const char * const str, uint64_t * const size) -{ - int ret; - uint64_t base_size; - long shift = 0; - const char *str_end; - char *num_end; - - if (!str) { - DBG("utils_parse_size_suffix: received a NULL string."); - ret = -1; - goto end; - } - - /* strtoull will accept a negative number, but we don't want to. */ - if (strchr(str, '-') != NULL) { - DBG("utils_parse_size_suffix: invalid size string, should not contain '-'."); - ret = -1; - goto end; - } - - /* str_end will point to the \0 */ - str_end = str + strlen(str); - errno = 0; - base_size = strtoull(str, &num_end, 0); - if (errno != 0) { - PERROR("utils_parse_size_suffix strtoull"); - ret = -1; - goto end; - } - - if (num_end == str) { - /* strtoull parsed nothing, not good. */ - DBG("utils_parse_size_suffix: strtoull had nothing good to parse."); - ret = -1; - goto end; - } - - /* Check if a prefix is present. */ - switch (*num_end) { - case 'G': - shift = GIBI_LOG2; - num_end++; - break; - case 'M': /* */ - shift = MEBI_LOG2; - num_end++; - break; - case 'K': - case 'k': - shift = KIBI_LOG2; - num_end++; - break; - case '\0': - break; - default: - DBG("utils_parse_size_suffix: invalid suffix."); - ret = -1; - goto end; - } - - /* Check for garbage after the valid input. */ - if (num_end != str_end) { - DBG("utils_parse_size_suffix: Garbage after size string."); - ret = -1; - goto end; - } - - *size = base_size << shift; - - /* Check for overflow */ - if ((*size >> shift) != base_size) { - DBG("utils_parse_size_suffix: oops, overflow detected."); - ret = -1; - goto end; - } - - ret = 0; -end: - return ret; -} - -/* - * fls: returns the position of the most significant bit. - * Returns 0 if no bit is set, else returns the position of the most - * significant bit (from 1 to 32 on 32-bit, from 1 to 64 on 64-bit). - */ -#if defined(__i386) || defined(__x86_64) -static inline unsigned int fls_u32(uint32_t x) -{ - int r; - - asm("bsrl %1,%0\n\t" - "jnz 1f\n\t" - "movl $-1,%0\n\t" - "1:\n\t" - : "=r" (r) : "rm" (x)); - return r + 1; -} -#define HAS_FLS_U32 -#endif - -#ifndef HAS_FLS_U32 -static __attribute__((unused)) unsigned int fls_u32(uint32_t x) -{ - unsigned int r = 32; - - if (!x) { - return 0; - } - if (!(x & 0xFFFF0000U)) { - x <<= 16; - r -= 16; - } - if (!(x & 0xFF000000U)) { - x <<= 8; - r -= 8; - } - if (!(x & 0xF0000000U)) { - x <<= 4; - r -= 4; - } - if (!(x & 0xC0000000U)) { - x <<= 2; - r -= 2; - } - if (!(x & 0x80000000U)) { - x <<= 1; - r -= 1; - } - return r; -} -#endif - -/* - * Return the minimum order for which x <= (1UL << order). - * Return -1 if x is 0. - */ -LTTNG_HIDDEN -int utils_get_count_order_u32(uint32_t x) -{ - if (!x) { - return -1; - } - - return fls_u32(x - 1); -} - -/** - * Obtain the value of LTTNG_HOME environment variable, if exists. - * Otherwise returns the value of HOME. - */ -LTTNG_HIDDEN -char *utils_get_home_dir(void) -{ - char *val = NULL; - struct passwd *pwd; - - val = getenv(DEFAULT_LTTNG_HOME_ENV_VAR); - if (val != NULL) { - goto end; - } - val = getenv(DEFAULT_LTTNG_FALLBACK_HOME_ENV_VAR); - if (val != NULL) { - goto end; - } - - /* Fallback on the password file entry. */ - pwd = getpwuid(getuid()); - if (!pwd) { - goto end; - } - val = pwd->pw_dir; - - DBG3("Home directory is '%s'", val); - -end: - return val; -} - -/** - * Get user's home directory. Dynamically allocated, must be freed - * by the caller. - */ -LTTNG_HIDDEN -char *utils_get_user_home_dir(uid_t uid) -{ - struct passwd pwd; - struct passwd *result; - char *home_dir = NULL; - char *buf = NULL; - long buflen; - int ret; - - buflen = sysconf(_SC_GETPW_R_SIZE_MAX); - if (buflen == -1) { - goto end; - } -retry: - buf = zmalloc(buflen); - if (!buf) { - goto end; - } - - ret = getpwuid_r(uid, &pwd, buf, buflen, &result); - if (ret || !result) { - if (ret == ERANGE) { - free(buf); - buflen *= 2; - goto retry; - } - goto end; - } - - home_dir = strdup(pwd.pw_dir); -end: - free(buf); - return home_dir; -} - -/* - * Obtain the value of LTTNG_KMOD_PROBES environment variable, if exists. - * Otherwise returns NULL. - */ -LTTNG_HIDDEN -char *utils_get_kmod_probes_list(void) -{ - return getenv(DEFAULT_LTTNG_KMOD_PROBES); -} - -/* - * Obtain the value of LTTNG_EXTRA_KMOD_PROBES environment variable, if - * exists. Otherwise returns NULL. - */ -LTTNG_HIDDEN -char *utils_get_extra_kmod_probes_list(void) -{ - return getenv(DEFAULT_LTTNG_EXTRA_KMOD_PROBES); -} - -/* - * With the given format, fill dst with the time of len maximum siz. - * - * Return amount of bytes set in the buffer or else 0 on error. - */ -LTTNG_HIDDEN -size_t utils_get_current_time_str(const char *format, char *dst, size_t len) -{ - size_t ret; - time_t rawtime; - struct tm *timeinfo; - - assert(format); - assert(dst); - - /* Get date and time for session path */ - time(&rawtime); - timeinfo = localtime(&rawtime); - ret = strftime(dst, len, format, timeinfo); - if (ret == 0) { - ERR("Unable to strftime with format %s at dst %p of len %zu", format, - dst, len); - } - - return ret; -} - -/* - * Return the group ID matching name, else 0 if it cannot be found. - */ -LTTNG_HIDDEN -gid_t utils_get_group_id(const char *name) -{ - struct group *grp; - - grp = getgrnam(name); - if (!grp) { - static volatile int warn_once; - - if (!warn_once) { - WARN("No tracing group detected"); - warn_once = 1; - } - return 0; - } - return grp->gr_gid; -} - -/* - * Return a newly allocated option string. This string is to be used as the - * optstring argument of getopt_long(), see GETOPT(3). opt_count is the number - * of elements in the long_options array. Returns NULL if the string's - * allocation fails. - */ -LTTNG_HIDDEN -char *utils_generate_optstring(const struct option *long_options, - size_t opt_count) -{ - int i; - size_t string_len = opt_count, str_pos = 0; - char *optstring; - - /* - * Compute the necessary string length. One letter per option, two when an - * argument is necessary, and a trailing NULL. - */ - for (i = 0; i < opt_count; i++) { - string_len += long_options[i].has_arg ? 1 : 0; - } - - optstring = zmalloc(string_len); - if (!optstring) { - goto end; - } - - for (i = 0; i < opt_count; i++) { - if (!long_options[i].name) { - /* Got to the trailing NULL element */ - break; - } - - optstring[str_pos++] = (char)long_options[i].val; - if (long_options[i].has_arg) { - optstring[str_pos++] = ':'; - } - } - -end: - return optstring; -}