/*-*- Mode: C; c-basic-offset: 8 -*-*/ /*** 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 General Public License as published by the Free Software Foundation; either version 2 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 General Public License for more details. You should have received a copy of the GNU General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <string.h> #include <stdio.h> #include <errno.h> #include <assert.h> #include <stdlib.h> #include "conf-parser.h" #include "util.h" #include "macro.h" #include "strv.h" #include "log.h" #define COMMENTS "#;\n" #define LINE_MAX 4096 /* Run the user supplied parser for an assignment */ static int next_assignment( const char *filename, unsigned line, const char *section, const ConfigItem *t, bool relaxed, const char *lvalue, const char *rvalue, void *userdata) { assert(filename); assert(t); assert(lvalue); assert(rvalue); for (; t->parse; t++) { if (t->lvalue && !streq(lvalue, t->lvalue)) continue; if (t->section && !section) continue; if (t->section && !streq(section, t->section)) continue; if (!t->parse) return 0; return t->parse(filename, line, section, lvalue, rvalue, t->data, userdata); } /* Warn about unknown non-extension fields. */ if (!relaxed && !startswith(lvalue, "X-")) log_info("[%s:%u] Unknown lvalue '%s' in section '%s'. Ignoring.", filename, line, lvalue, strna(section)); return 0; } /* Parse a variable assignment line */ static int parse_line(const char *filename, unsigned line, char **section, const char* const * sections, const ConfigItem *t, bool relaxed, char *l, void *userdata) { char *e; l = strstrip(l); if (!*l) return 0; if (strchr(COMMENTS, *l)) return 0; if (startswith(l, ".include ")) { char *fn; int r; if (!(fn = file_in_same_dir(filename, strstrip(l+9)))) return -ENOMEM; r = config_parse(fn, NULL, sections, t, relaxed, userdata); free(fn); return r; } if (*l == '[') { size_t k; char *n; k = strlen(l); assert(k > 0); if (l[k-1] != ']') { log_error("[%s:%u] Invalid section header.", filename, line); return -EBADMSG; } if (!(n = strndup(l+1, k-2))) return -ENOMEM; if (!relaxed && sections && !strv_contains((char**) sections, n)) log_info("[%s:%u] Unknown section '%s'. Ignoring.", filename, line, n); free(*section); *section = n; return 0; } if (sections && !strv_contains((char**) sections, *section)) return 0; if (!(e = strchr(l, '='))) { log_error("[%s:%u] Missing '='.", filename, line); return -EBADMSG; } *e = 0; e++; return next_assignment(filename, line, *section, t, relaxed, strstrip(l), strstrip(e), userdata); } /* Go through the file and parse each line */ int config_parse(const char *filename, FILE *f, const char* const * sections, const ConfigItem *t, bool relaxed, void *userdata) { unsigned line = 0; char *section = NULL; int r; bool ours = false; assert(filename); assert(t); if (!f) { if (!(f = fopen(filename, "re"))) { r = -errno; log_error("Failed to open configuration file '%s': %s", filename, strerror(-r)); goto finish; } ours = true; } while (!feof(f)) { char l[LINE_MAX]; if (!fgets(l, sizeof(l), f)) { if (feof(f)) break; r = -errno; log_error("Failed to read configuration file '%s': %s", filename, strerror(-r)); goto finish; } if ((r = parse_line(filename, ++line, §ion, sections, t, relaxed, l, userdata)) < 0) goto finish; } r = 0; finish: free(section); if (f && ours) fclose(f); return r; } int config_parse_int( const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata) { int *i = data; int r; assert(filename); assert(lvalue); assert(rvalue); assert(data); if ((r = safe_atoi(rvalue, i)) < 0) { log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue); return r; } return 0; } int config_parse_unsigned( const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata) { unsigned *u = data; int r; assert(filename); assert(lvalue); assert(rvalue); assert(data); if ((r = safe_atou(rvalue, u)) < 0) { log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue); return r; } return 0; } int config_parse_size( const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata) { size_t *sz = data; unsigned u; int r; assert(filename); assert(lvalue); assert(rvalue); assert(data); if ((r = safe_atou(rvalue, &u)) < 0) { log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue); return r; } *sz = (size_t) u; return 0; } int config_parse_bool( const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata) { int k; bool *b = data; assert(filename); assert(lvalue); assert(rvalue); assert(data); if ((k = parse_boolean(rvalue)) < 0) { log_error("[%s:%u] Failed to parse boolean value: %s", filename, line, rvalue); return k; } *b = !!k; return 0; } int config_parse_string( const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata) { char **s = data; char *n; assert(filename); assert(lvalue); assert(rvalue); assert(data); if (*rvalue) { if (!(n = strdup(rvalue))) return -ENOMEM; } else n = NULL; free(*s); *s = n; return 0; } int config_parse_path( const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata) { char **s = data; char *n; assert(filename); assert(lvalue); assert(rvalue); assert(data); if (!path_is_absolute(rvalue)) { log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue); return -EINVAL; } if (!(n = strdup(rvalue))) return -ENOMEM; path_kill_slashes(n); free(*s); *s = n; return 0; } int config_parse_strv( const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata) { char*** sv = data; char **n; char *w; unsigned k; size_t l; char *state; assert(filename); assert(lvalue); assert(rvalue); assert(data); k = strv_length(*sv); FOREACH_WORD_QUOTED(w, l, rvalue, state) k++; if (!(n = new(char*, k+1))) return -ENOMEM; if (*sv) for (k = 0; (*sv)[k]; k++) n[k] = (*sv)[k]; else k = 0; FOREACH_WORD_QUOTED(w, l, rvalue, state) if (!(n[k++] = strndup(w, l))) goto fail; n[k] = NULL; free(*sv); *sv = n; return 0; fail: for (; k > 0; k--) free(n[k-1]); free(n); return -ENOMEM; } int config_parse_path_strv( const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata) { char*** sv = data; char **n; char *w; unsigned k; size_t l; char *state; int r; assert(filename); assert(lvalue); assert(rvalue); assert(data); k = strv_length(*sv); FOREACH_WORD_QUOTED(w, l, rvalue, state) k++; if (!(n = new(char*, k+1))) return -ENOMEM; k = 0; if (*sv) for (; (*sv)[k]; k++) n[k] = (*sv)[k]; FOREACH_WORD_QUOTED(w, l, rvalue, state) { if (!(n[k] = strndup(w, l))) { r = -ENOMEM; goto fail; } if (!path_is_absolute(n[k])) { log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue); r = -EINVAL; goto fail; } path_kill_slashes(n[k]); k++; } n[k] = NULL; free(*sv); *sv = n; return 0; fail: free(n[k]); for (; k > 0; k--) free(n[k-1]); free(n); return r; }