/*-*- 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 <sys/sendfile.h> #include "fileio.h" #include "util.h" #include "strv.h" #include "utf8.h" #include "ctype.h" int write_string_to_file(FILE *f, const char *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_to_file(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); errno = 0; fputs(line, f); if (!endswith(line, "\n")) fputc('\n', f); fflush(f); if (ferror(f)) r = errno ? -errno : -EIO; else { if (rename(p, fn) < 0) r = -errno; else r = 0; } 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; } ssize_t sendfile_full(int out_fd, const char *fn) { _cleanup_fclose_ FILE *f; struct stat st; int r; ssize_t s; size_t n, l; _cleanup_free_ char *buf = NULL; assert(out_fd > 0); assert(fn); f = fopen(fn, "r"); if (!f) return -errno; r = fstat(fileno(f), &st); if (r < 0) return -errno; s = sendfile(out_fd, fileno(f), NULL, st.st_size); if (s < 0) if (errno == EINVAL || errno == ENOSYS) { /* continue below */ } else return -errno; else return s; /* sendfile() failed, fall back to read/write */ /* Safety check */ if (st.st_size > 4*1024*1024) return -E2BIG; n = st.st_size > 0 ? st.st_size : LINE_MAX; l = 0; while (true) { char *t; size_t k; t = realloc(buf, n); 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; } r = write(out_fd, buf, l); if (r < 0) return -errno; return (ssize_t) l; } int read_full_file(const char *fn, char **contents, size_t *size) { _cleanup_fclose_ FILE *f = NULL; size_t n, l; _cleanup_free_ char *buf = NULL; struct stat st; assert(fn); assert(contents); f = fopen(fn, "re"); if (!f) return -errno; if (fstat(fileno(f), &st) < 0) return -errno; /* Safety check */ if (st.st_size > 4*1024*1024) return -E2BIG; n = st.st_size > 0 ? st.st_size : LINE_MAX; 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; } static int parse_env_file_internal( const char *fname, const char *newline, int (*push) (const char *filename, unsigned line, const char *key, char *value, void *userdata), void *userdata) { _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(fname); assert(newline); 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((void**) &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((void**) &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); 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((void**) &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); 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((void**) &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((void**) &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((void**) &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((void**) &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((void**) &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((void**) &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); 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) { assert(utf8_is_valid(key)); if (value && !utf8_is_valid(value)) /* FIXME: filter UTF-8 */ log_error("%s:%u: invalid UTF-8 for key %s: '%s', ignoring.", filename, line, key, value); else { const char *k; va_list* ap = (va_list*) userdata; va_list aq; 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; return 1; } } va_end(aq); } free(value); return 0; } int parse_env_file( const char *fname, const char *newline, ...) { va_list ap; int r; if (!newline) newline = NEWLINE; va_start(ap, newline); r = parse_env_file_internal(fname, newline, parse_env_file_push, &ap); va_end(ap); return r; } static int load_env_file_push(const char *filename, unsigned line, const char *key, char *value, void *userdata) { assert(utf8_is_valid(key)); if (value && !utf8_is_valid(value)) /* FIXME: filter UTF-8 */ log_error("%s:%u: invalid UTF-8 for key %s: '%s', ignoring.", filename, line, key, value); else { char ***m = userdata; char *p; int r; p = strjoin(key, "=", strempty(value), NULL); if (!p) return -ENOMEM; r = strv_push(m, p); if (r < 0) { free(p); return r; } } free(value); return 0; } int load_env_file(const char *fname, const char *newline, char ***rl) { char **m = NULL; int r; if (!newline) newline = NEWLINE; r = parse_env_file_internal(fname, newline, load_env_file_push, &m); 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) || chars_intersect(p, WHITESPACE "\'\"\\`$")) { fputc('\"', f); for (; *p; p++) { if (strchr("\'\"\\`$", *p)) fputc('\\', f); fputc(*p, f); } fputc('\"', f); } else fputs(p, f); fputc('\n', f); } int write_env_file(const char *fname, char **l) { char **i; _cleanup_free_ char *p = NULL; _cleanup_fclose_ FILE *f = NULL; int r; r = fopen_temporary(fname, &f, &p); if (r < 0) return r; fchmod_umask(fileno(f), 0644); errno = 0; STRV_FOREACH(i, l) write_env_var(f, *i); fflush(f); if (ferror(f)) r = errno ? -errno : -EIO; else { if (rename(p, fname) < 0) r = -errno; else r = 0; } if (r < 0) unlink(p); return r; } int executable_is_script(const char *path, char **interpreter) { int r; char _cleanup_free_ *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; }