/*-*- 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 <stdlib.h> #include <errno.h> #include <string.h> #include <unistd.h> #include <sys/statvfs.h> #include <fnmatch.h> #include "systemd/sd-id128.h" #include "util.h" #include "condition-util.h" #include "virt.h" #include "path-util.h" #include "fileio.h" #include "unit.h" #include "architecture.h" Condition* condition_new(ConditionType type, const char *parameter, bool trigger, bool negate) { Condition *c; assert(type < _CONDITION_TYPE_MAX); c = new0(Condition, 1); if (!c) return NULL; c->type = type; c->trigger = trigger; c->negate = negate; if (parameter) { c->parameter = strdup(parameter); if (!c->parameter) { free(c); return NULL; } } return c; } void condition_free(Condition *c) { assert(c); free(c->parameter); free(c); } void condition_free_list(Condition *first) { Condition *c, *n; LIST_FOREACH_SAFE(conditions, c, n, first) condition_free(c); } bool condition_test_kernel_command_line(Condition *c) { char *line, *word = NULL; const char *w, *state; bool equal; int r; size_t l, pl; bool found = false; assert(c); assert(c->parameter); assert(c->type == CONDITION_KERNEL_COMMAND_LINE); r = proc_cmdline(&line); if (r < 0) log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); if (r <= 0) return c->negate; equal = !!strchr(c->parameter, '='); pl = strlen(c->parameter); FOREACH_WORD_QUOTED(w, l, line, state) { free(word); word = strndup(w, l); if (!word) break; if (equal) { if (streq(word, c->parameter)) { found = true; break; } } else { if (startswith(word, c->parameter) && (word[pl] == '=' || word[pl] == 0)) { found = true; break; } } } if (!isempty(state)) log_warning("Trailing garbage and the end of kernel commandline, ignoring."); free(word); free(line); return found == !c->negate; } bool condition_test_virtualization(Condition *c) { int b, v; const char *id; assert(c); assert(c->parameter); assert(c->type == CONDITION_VIRTUALIZATION); v = detect_virtualization(&id); if (v < 0) { log_warning("Failed to detect virtualization, ignoring: %s", strerror(-v)); return c->negate; } /* First, compare with yes/no */ b = parse_boolean(c->parameter); if (v > 0 && b > 0) return !c->negate; if (v == 0 && b == 0) return !c->negate; /* Then, compare categorization */ if (v == VIRTUALIZATION_VM && streq(c->parameter, "vm")) return !c->negate; if (v == VIRTUALIZATION_CONTAINER && streq(c->parameter, "container")) return !c->negate; /* Finally compare id */ return (v > 0 && streq(c->parameter, id)) == !c->negate; } bool condition_test_architecture(Condition *c) { Architecture a, b; assert(c); assert(c->parameter); assert(c->type == CONDITION_ARCHITECTURE); a = uname_architecture(); if (a < 0) return c->negate; if (streq(c->parameter, "native")) b = native_architecture(); else b = architecture_from_string(c->parameter); if (b < 0) return c->negate; return (a == b) == !c->negate; } bool condition_test_host(Condition *c) { _cleanup_free_ char *h = NULL; sd_id128_t x, y; int r; assert(c); assert(c->parameter); assert(c->type == CONDITION_HOST); if (sd_id128_from_string(c->parameter, &x) >= 0) { r = sd_id128_get_machine(&y); if (r < 0) return c->negate; return sd_id128_equal(x, y) == !c->negate; } h = gethostname_malloc(); if (!h) return c->negate; return (fnmatch(c->parameter, h, FNM_CASEFOLD) == 0) == !c->negate; } bool condition_test_ac_power(Condition *c) { int r; assert(c); assert(c->parameter); assert(c->type == CONDITION_AC_POWER); r = parse_boolean(c->parameter); if (r < 0) return !c->negate; return ((on_ac_power() != 0) == !!r) == !c->negate; } void condition_dump(Condition *c, FILE *f, const char *prefix) { assert(c); assert(f); if (!prefix) prefix = ""; fprintf(f, "%s\t%s: %s%s%s %s\n", prefix, condition_type_to_string(c->type), c->trigger ? "|" : "", c->negate ? "!" : "", c->parameter, c->state < 0 ? "failed" : c->state > 0 ? "succeeded" : "untested"); } void condition_dump_list(Condition *first, FILE *f, const char *prefix) { Condition *c; LIST_FOREACH(conditions, c, first) condition_dump(c, f, prefix); } static const char* const condition_type_table[_CONDITION_TYPE_MAX] = { [CONDITION_PATH_EXISTS] = "ConditionPathExists", [CONDITION_PATH_EXISTS_GLOB] = "ConditionPathExistsGlob", [CONDITION_PATH_IS_DIRECTORY] = "ConditionPathIsDirectory", [CONDITION_PATH_IS_SYMBOLIC_LINK] = "ConditionPathIsSymbolicLink", [CONDITION_PATH_IS_MOUNT_POINT] = "ConditionPathIsMountPoint", [CONDITION_PATH_IS_READ_WRITE] = "ConditionPathIsReadWrite", [CONDITION_DIRECTORY_NOT_EMPTY] = "ConditionDirectoryNotEmpty", [CONDITION_FILE_NOT_EMPTY] = "ConditionFileNotEmpty", [CONDITION_FILE_IS_EXECUTABLE] = "ConditionFileIsExecutable", [CONDITION_KERNEL_COMMAND_LINE] = "ConditionKernelCommandLine", [CONDITION_VIRTUALIZATION] = "ConditionVirtualization", [CONDITION_SECURITY] = "ConditionSecurity", [CONDITION_CAPABILITY] = "ConditionCapability", [CONDITION_HOST] = "ConditionHost", [CONDITION_AC_POWER] = "ConditionACPower", [CONDITION_ARCHITECTURE] = "ConditionArchitecture", [CONDITION_NEEDS_UPDATE] = "ConditionNeedsUpdate", [CONDITION_FIRST_BOOT] = "ConditionFirstBoot", [CONDITION_NULL] = "ConditionNull" }; DEFINE_STRING_TABLE_LOOKUP(condition_type, ConditionType);