| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| This file is part of systemd. |
| |
| Copyright 2010 Lennart Poettering |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| #include <unistd.h> |
| |
| #include "util.h" |
| #include "strv.h" |
| #include "utf8.h" |
| #include "ctype.h" |
| #include "fileio.h" |
| |
| int write_string_stream(FILE *f, const char *line) { |
| assert(f); |
| assert(line); |
| |
| errno = 0; |
| |
| fputs(line, f); |
| if (!endswith(line, "\n")) |
| fputc('\n', f); |
| |
| fflush(f); |
| |
| if (ferror(f)) |
| return errno ? -errno : -EIO; |
| |
| return 0; |
| } |
| |
| int write_string_file(const char *fn, const char *line) { |
| _cleanup_fclose_ FILE *f = NULL; |
| |
| assert(fn); |
| assert(line); |
| |
| f = fopen(fn, "we"); |
| if (!f) |
| return -errno; |
| |
| return write_string_stream(f, line); |
| } |
| |
| int write_string_file_no_create(const char *fn, const char *line) { |
| _cleanup_fclose_ FILE *f = NULL; |
| int fd; |
| |
| assert(fn); |
| assert(line); |
| |
| /* We manually build our own version of fopen(..., "we") that |
| * works without O_CREAT */ |
| fd = open(fn, O_WRONLY|O_CLOEXEC|O_NOCTTY); |
| if (fd < 0) |
| return -errno; |
| |
| f = fdopen(fd, "we"); |
| if (!f) { |
| safe_close(fd); |
| return -errno; |
| } |
| |
| return write_string_stream(f, line); |
| } |
| |
| int write_string_file_atomic(const char *fn, const char *line) { |
| _cleanup_fclose_ FILE *f = NULL; |
| _cleanup_free_ char *p = NULL; |
| int r; |
| |
| assert(fn); |
| assert(line); |
| |
| r = fopen_temporary(fn, &f, &p); |
| if (r < 0) |
| return r; |
| |
| fchmod_umask(fileno(f), 0644); |
| |
| r = write_string_stream(f, line); |
| if (r >= 0) { |
| if (rename(p, fn) < 0) |
| r = -errno; |
| } |
| |
| if (r < 0) |
| unlink(p); |
| |
| return r; |
| } |
| |
| int read_one_line_file(const char *fn, char **line) { |
| _cleanup_fclose_ FILE *f = NULL; |
| char t[LINE_MAX], *c; |
| |
| assert(fn); |
| assert(line); |
| |
| f = fopen(fn, "re"); |
| if (!f) |
| return -errno; |
| |
| if (!fgets(t, sizeof(t), f)) { |
| |
| if (ferror(f)) |
| return errno ? -errno : -EIO; |
| |
| t[0] = 0; |
| } |
| |
| c = strdup(t); |
| if (!c) |
| return -ENOMEM; |
| truncate_nl(c); |
| |
| *line = c; |
| return 0; |
| } |
| |
| int verify_one_line_file(const char *fn, const char *line) { |
| _cleanup_free_ char *value = NULL; |
| int r; |
| |
| r = read_one_line_file(fn, &value); |
| if (r < 0) |
| return r; |
| |
| return streq(value, line); |
| } |
| |
| int read_full_stream(FILE *f, char **contents, size_t *size) { |
| size_t n, l; |
| _cleanup_free_ char *buf = NULL; |
| struct stat st; |
| |
| assert(f); |
| assert(contents); |
| |
| if (fstat(fileno(f), &st) < 0) |
| return -errno; |
| |
| n = LINE_MAX; |
| |
| if (S_ISREG(st.st_mode)) { |
| |
| /* Safety check */ |
| if (st.st_size > 4*1024*1024) |
| return -E2BIG; |
| |
| /* Start with the right file size, but be prepared for |
| * files from /proc which generally report a file size |
| * of 0 */ |
| if (st.st_size > 0) |
| n = st.st_size; |
| } |
| |
| l = 0; |
| for (;;) { |
| char *t; |
| size_t k; |
| |
| t = realloc(buf, n+1); |
| if (!t) |
| return -ENOMEM; |
| |
| buf = t; |
| k = fread(buf + l, 1, n - l, f); |
| |
| if (k <= 0) { |
| if (ferror(f)) |
| return -errno; |
| |
| break; |
| } |
| |
| l += k; |
| n *= 2; |
| |
| /* Safety check */ |
| if (n > 4*1024*1024) |
| return -E2BIG; |
| } |
| |
| buf[l] = 0; |
| *contents = buf; |
| buf = NULL; /* do not free */ |
| |
| if (size) |
| *size = l; |
| |
| return 0; |
| } |
| |
| int read_full_file(const char *fn, char **contents, size_t *size) { |
| _cleanup_fclose_ FILE *f = NULL; |
| |
| assert(fn); |
| assert(contents); |
| |
| f = fopen(fn, "re"); |
| if (!f) |
| return -errno; |
| |
| return read_full_stream(f, contents, size); |
| } |
| |
| static int parse_env_file_internal( |
| FILE *f, |
| const char *fname, |
| const char *newline, |
| int (*push) (const char *filename, unsigned line, |
| const char *key, char *value, void *userdata, int *n_pushed), |
| void *userdata, |
| int *n_pushed) { |
| |
| _cleanup_free_ char *contents = NULL, *key = NULL; |
| size_t key_alloc = 0, n_key = 0, value_alloc = 0, n_value = 0, last_value_whitespace = (size_t) -1, last_key_whitespace = (size_t) -1; |
| char *p, *value = NULL; |
| int r; |
| unsigned line = 1; |
| |
| enum { |
| PRE_KEY, |
| KEY, |
| PRE_VALUE, |
| VALUE, |
| VALUE_ESCAPE, |
| SINGLE_QUOTE_VALUE, |
| SINGLE_QUOTE_VALUE_ESCAPE, |
| DOUBLE_QUOTE_VALUE, |
| DOUBLE_QUOTE_VALUE_ESCAPE, |
| COMMENT, |
| COMMENT_ESCAPE |
| } state = PRE_KEY; |
| |
| assert(newline); |
| |
| if (f) |
| r = read_full_stream(f, &contents, NULL); |
| else |
| r = read_full_file(fname, &contents, NULL); |
| if (r < 0) |
| return r; |
| |
| for (p = contents; *p; p++) { |
| char c = *p; |
| |
| switch (state) { |
| |
| case PRE_KEY: |
| if (strchr(COMMENTS, c)) |
| state = COMMENT; |
| else if (!strchr(WHITESPACE, c)) { |
| state = KEY; |
| last_key_whitespace = (size_t) -1; |
| |
| if (!GREEDY_REALLOC(key, key_alloc, n_key+2)) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| key[n_key++] = c; |
| } |
| break; |
| |
| case KEY: |
| if (strchr(newline, c)) { |
| state = PRE_KEY; |
| line ++; |
| n_key = 0; |
| } else if (c == '=') { |
| state = PRE_VALUE; |
| last_value_whitespace = (size_t) -1; |
| } else { |
| if (!strchr(WHITESPACE, c)) |
| last_key_whitespace = (size_t) -1; |
| else if (last_key_whitespace == (size_t) -1) |
| last_key_whitespace = n_key; |
| |
| if (!GREEDY_REALLOC(key, key_alloc, n_key+2)) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| key[n_key++] = c; |
| } |
| |
| break; |
| |
| case PRE_VALUE: |
| if (strchr(newline, c)) { |
| state = PRE_KEY; |
| line ++; |
| key[n_key] = 0; |
| |
| if (value) |
| value[n_value] = 0; |
| |
| /* strip trailing whitespace from key */ |
| if (last_key_whitespace != (size_t) -1) |
| key[last_key_whitespace] = 0; |
| |
| r = push(fname, line, key, value, userdata, n_pushed); |
| if (r < 0) |
| goto fail; |
| |
| n_key = 0; |
| value = NULL; |
| value_alloc = n_value = 0; |
| |
| } else if (c == '\'') |
| state = SINGLE_QUOTE_VALUE; |
| else if (c == '\"') |
| state = DOUBLE_QUOTE_VALUE; |
| else if (c == '\\') |
| state = VALUE_ESCAPE; |
| else if (!strchr(WHITESPACE, c)) { |
| state = VALUE; |
| |
| if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| value[n_value++] = c; |
| } |
| |
| break; |
| |
| case VALUE: |
| if (strchr(newline, c)) { |
| state = PRE_KEY; |
| line ++; |
| |
| key[n_key] = 0; |
| |
| if (value) |
| value[n_value] = 0; |
| |
| /* Chomp off trailing whitespace from value */ |
| if (last_value_whitespace != (size_t) -1) |
| value[last_value_whitespace] = 0; |
| |
| /* strip trailing whitespace from key */ |
| if (last_key_whitespace != (size_t) -1) |
| key[last_key_whitespace] = 0; |
| |
| r = push(fname, line, key, value, userdata, n_pushed); |
| if (r < 0) |
| goto fail; |
| |
| n_key = 0; |
| value = NULL; |
| value_alloc = n_value = 0; |
| |
| } else if (c == '\\') { |
| state = VALUE_ESCAPE; |
| last_value_whitespace = (size_t) -1; |
| } else { |
| if (!strchr(WHITESPACE, c)) |
| last_value_whitespace = (size_t) -1; |
| else if (last_value_whitespace == (size_t) -1) |
| last_value_whitespace = n_value; |
| |
| if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| value[n_value++] = c; |
| } |
| |
| break; |
| |
| case VALUE_ESCAPE: |
| state = VALUE; |
| |
| if (!strchr(newline, c)) { |
| /* Escaped newlines we eat up entirely */ |
| if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| value[n_value++] = c; |
| } |
| break; |
| |
| case SINGLE_QUOTE_VALUE: |
| if (c == '\'') |
| state = PRE_VALUE; |
| else if (c == '\\') |
| state = SINGLE_QUOTE_VALUE_ESCAPE; |
| else { |
| if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| value[n_value++] = c; |
| } |
| |
| break; |
| |
| case SINGLE_QUOTE_VALUE_ESCAPE: |
| state = SINGLE_QUOTE_VALUE; |
| |
| if (!strchr(newline, c)) { |
| if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| value[n_value++] = c; |
| } |
| break; |
| |
| case DOUBLE_QUOTE_VALUE: |
| if (c == '\"') |
| state = PRE_VALUE; |
| else if (c == '\\') |
| state = DOUBLE_QUOTE_VALUE_ESCAPE; |
| else { |
| if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| value[n_value++] = c; |
| } |
| |
| break; |
| |
| case DOUBLE_QUOTE_VALUE_ESCAPE: |
| state = DOUBLE_QUOTE_VALUE; |
| |
| if (!strchr(newline, c)) { |
| if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| value[n_value++] = c; |
| } |
| break; |
| |
| case COMMENT: |
| if (c == '\\') |
| state = COMMENT_ESCAPE; |
| else if (strchr(newline, c)) { |
| state = PRE_KEY; |
| line ++; |
| } |
| break; |
| |
| case COMMENT_ESCAPE: |
| state = COMMENT; |
| break; |
| } |
| } |
| |
| if (state == PRE_VALUE || |
| state == VALUE || |
| state == VALUE_ESCAPE || |
| state == SINGLE_QUOTE_VALUE || |
| state == SINGLE_QUOTE_VALUE_ESCAPE || |
| state == DOUBLE_QUOTE_VALUE || |
| state == DOUBLE_QUOTE_VALUE_ESCAPE) { |
| |
| key[n_key] = 0; |
| |
| if (value) |
| value[n_value] = 0; |
| |
| if (state == VALUE) |
| if (last_value_whitespace != (size_t) -1) |
| value[last_value_whitespace] = 0; |
| |
| /* strip trailing whitespace from key */ |
| if (last_key_whitespace != (size_t) -1) |
| key[last_key_whitespace] = 0; |
| |
| r = push(fname, line, key, value, userdata, n_pushed); |
| if (r < 0) |
| goto fail; |
| } |
| |
| return 0; |
| |
| fail: |
| free(value); |
| return r; |
| } |
| |
| static int parse_env_file_push( |
| const char *filename, unsigned line, |
| const char *key, char *value, |
| void *userdata, |
| int *n_pushed) { |
| |
| const char *k; |
| va_list aq, *ap = userdata; |
| |
| if (!utf8_is_valid(key)) { |
| _cleanup_free_ char *p; |
| |
| p = utf8_escape_invalid(key); |
| log_error("%s:%u: invalid UTF-8 in key '%s', ignoring.", strna(filename), line, p); |
| return -EINVAL; |
| } |
| |
| if (value && !utf8_is_valid(value)) { |
| _cleanup_free_ char *p; |
| |
| p = utf8_escape_invalid(value); |
| log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, p); |
| return -EINVAL; |
| } |
| |
| va_copy(aq, *ap); |
| |
| while ((k = va_arg(aq, const char *))) { |
| char **v; |
| |
| v = va_arg(aq, char **); |
| |
| if (streq(key, k)) { |
| va_end(aq); |
| free(*v); |
| *v = value; |
| |
| if (n_pushed) |
| (*n_pushed)++; |
| |
| return 1; |
| } |
| } |
| |
| va_end(aq); |
| free(value); |
| |
| return 0; |
| } |
| |
| int parse_env_file( |
| const char *fname, |
| const char *newline, ...) { |
| |
| va_list ap; |
| int r, n_pushed = 0; |
| |
| if (!newline) |
| newline = NEWLINE; |
| |
| va_start(ap, newline); |
| r = parse_env_file_internal(NULL, fname, newline, parse_env_file_push, &ap, &n_pushed); |
| va_end(ap); |
| |
| return r < 0 ? r : n_pushed; |
| } |
| |
| static int load_env_file_push( |
| const char *filename, unsigned line, |
| const char *key, char *value, |
| void *userdata, |
| int *n_pushed) { |
| char ***m = userdata; |
| char *p; |
| int r; |
| |
| if (!utf8_is_valid(key)) { |
| _cleanup_free_ char *t = utf8_escape_invalid(key); |
| |
| log_error("%s:%u: invalid UTF-8 for key '%s', ignoring.", strna(filename), line, t); |
| return -EINVAL; |
| } |
| |
| if (value && !utf8_is_valid(value)) { |
| _cleanup_free_ char *t = utf8_escape_invalid(value); |
| |
| log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, t); |
| return -EINVAL; |
| } |
| |
| p = strjoin(key, "=", strempty(value), NULL); |
| if (!p) |
| return -ENOMEM; |
| |
| r = strv_consume(m, p); |
| if (r < 0) |
| return r; |
| |
| if (n_pushed) |
| (*n_pushed)++; |
| |
| free(value); |
| return 0; |
| } |
| |
| int load_env_file(FILE *f, const char *fname, const char *newline, char ***rl) { |
| char **m = NULL; |
| int r; |
| |
| if (!newline) |
| newline = NEWLINE; |
| |
| r = parse_env_file_internal(f, fname, newline, load_env_file_push, &m, NULL); |
| if (r < 0) { |
| strv_free(m); |
| return r; |
| } |
| |
| *rl = m; |
| return 0; |
| } |
| |
| static int load_env_file_push_pairs( |
| const char *filename, unsigned line, |
| const char *key, char *value, |
| void *userdata, |
| int *n_pushed) { |
| char ***m = userdata; |
| int r; |
| |
| if (!utf8_is_valid(key)) { |
| _cleanup_free_ char *t = utf8_escape_invalid(key); |
| |
| log_error("%s:%u: invalid UTF-8 for key '%s', ignoring.", strna(filename), line, t); |
| return -EINVAL; |
| } |
| |
| if (value && !utf8_is_valid(value)) { |
| _cleanup_free_ char *t = utf8_escape_invalid(value); |
| |
| log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, t); |
| return -EINVAL; |
| } |
| |
| r = strv_extend(m, key); |
| if (r < 0) |
| return -ENOMEM; |
| |
| if (!value) { |
| r = strv_extend(m, ""); |
| if (r < 0) |
| return -ENOMEM; |
| } else { |
| r = strv_push(m, value); |
| if (r < 0) |
| return r; |
| } |
| |
| if (n_pushed) |
| (*n_pushed)++; |
| |
| return 0; |
| } |
| |
| int load_env_file_pairs(FILE *f, const char *fname, const char *newline, char ***rl) { |
| char **m = NULL; |
| int r; |
| |
| if (!newline) |
| newline = NEWLINE; |
| |
| r = parse_env_file_internal(f, fname, newline, load_env_file_push_pairs, &m, NULL); |
| if (r < 0) { |
| strv_free(m); |
| return r; |
| } |
| |
| *rl = m; |
| return 0; |
| } |
| |
| static void write_env_var(FILE *f, const char *v) { |
| const char *p; |
| |
| p = strchr(v, '='); |
| if (!p) { |
| /* Fallback */ |
| fputs(v, f); |
| fputc('\n', f); |
| return; |
| } |
| |
| p++; |
| fwrite(v, 1, p-v, f); |
| |
| if (string_has_cc(p, NULL) || chars_intersect(p, WHITESPACE SHELL_NEED_QUOTES)) { |
| fputc('\"', f); |
| |
| for (; *p; p++) { |
| if (strchr(SHELL_NEED_ESCAPE, *p)) |
| fputc('\\', f); |
| |
| fputc(*p, f); |
| } |
| |
| fputc('\"', f); |
| } else |
| fputs(p, f); |
| |
| fputc('\n', f); |
| } |
| |
| int write_env_file(const char *fname, char **l) { |
| _cleanup_fclose_ FILE *f = NULL; |
| _cleanup_free_ char *p = NULL; |
| char **i; |
| int r; |
| |
| assert(fname); |
| |
| r = fopen_temporary(fname, &f, &p); |
| if (r < 0) |
| return r; |
| |
| fchmod_umask(fileno(f), 0644); |
| |
| STRV_FOREACH(i, l) |
| write_env_var(f, *i); |
| |
| r = fflush_and_check(f); |
| if (r >= 0) { |
| if (rename(p, fname) >= 0) |
| return 0; |
| |
| r = -errno; |
| } |
| |
| unlink(p); |
| return r; |
| } |
| |
| int executable_is_script(const char *path, char **interpreter) { |
| int r; |
| _cleanup_free_ char *line = NULL; |
| int len; |
| char *ans; |
| |
| assert(path); |
| |
| r = read_one_line_file(path, &line); |
| if (r < 0) |
| return r; |
| |
| if (!startswith(line, "#!")) |
| return 0; |
| |
| ans = strstrip(line + 2); |
| len = strcspn(ans, " \t"); |
| |
| if (len == 0) |
| return 0; |
| |
| ans = strndup(ans, len); |
| if (!ans) |
| return -ENOMEM; |
| |
| *interpreter = ans; |
| return 1; |
| } |
| |
| /** |
| * Retrieve one field from a file like /proc/self/status. pattern |
| * should start with '\n' and end with a ':'. Whitespace and zeros |
| * after the ':' will be skipped. field must be freed afterwards. |
| */ |
| int get_status_field(const char *filename, const char *pattern, char **field) { |
| _cleanup_free_ char *status = NULL; |
| char *t; |
| size_t len; |
| int r; |
| |
| assert(filename); |
| assert(pattern); |
| assert(field); |
| |
| r = read_full_file(filename, &status, NULL); |
| if (r < 0) |
| return r; |
| |
| t = strstr(status, pattern); |
| if (!t) |
| return -ENOENT; |
| |
| t += strlen(pattern); |
| if (*t) { |
| t += strspn(t, " \t"); |
| |
| /* Also skip zeros, because when this is used for |
| * capabilities, we don't want the zeros. This way the |
| * same capability set always maps to the same string, |
| * irrespective of the total capability set size. For |
| * other numbers it shouldn't matter. */ |
| t += strspn(t, "0"); |
| /* Back off one char if there's nothing but whitespace |
| and zeros */ |
| if (!*t || isspace(*t)) |
| t --; |
| } |
| |
| len = strcspn(t, WHITESPACE); |
| |
| *field = strndup(t, len); |
| if (!*field) |
| return -ENOMEM; |
| |
| return 0; |
| } |