/*** 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 <errno.h> #include <stdbool.h> #include <stddef.h> #include <stdlib.h> #include <string.h> #include <sys/utsname.h> #include "sd-id128.h" #include "alloc-util.h" #include "hostname-util.h" #include "macro.h" #include "specifier.h" #include "string-util.h" /* * Generic infrastructure for replacing %x style specifiers in * strings. Will call a callback for each replacement. * */ int specifier_printf(const char *text, const Specifier table[], void *userdata, char **_ret) { char *ret, *t; const char *f; bool percent = false; size_t l; int r; assert(text); assert(table); l = strlen(text); ret = new(char, l+1); if (!ret) return -ENOMEM; t = ret; for (f = text; *f; f++, l--) { if (percent) { if (*f == '%') *(t++) = '%'; else { const Specifier *i; for (i = table; i->specifier; i++) if (i->specifier == *f) break; if (i->lookup) { _cleanup_free_ char *w = NULL; char *n; size_t k, j; r = i->lookup(i->specifier, i->data, userdata, &w); if (r < 0) { free(ret); return r; } j = t - ret; k = strlen(w); n = new(char, j + k + l + 1); if (!n) { free(ret); return -ENOMEM; } memcpy(n, ret, j); memcpy(n + j, w, k); free(ret); ret = n; t = n + j + k; } else { *(t++) = '%'; *(t++) = *f; } } percent = false; } else if (*f == '%') percent = true; else *(t++) = *f; } *t = 0; *_ret = ret; return 0; } /* Generic handler for simple string replacements */ int specifier_string(char specifier, void *data, void *userdata, char **ret) { char *n; n = strdup(strempty(data)); if (!n) return -ENOMEM; *ret = n; return 0; } int specifier_machine_id(char specifier, void *data, void *userdata, char **ret) { sd_id128_t id; char *n; int r; r = sd_id128_get_machine(&id); if (r < 0) return r; n = new(char, 33); if (!n) return -ENOMEM; *ret = sd_id128_to_string(id, n); return 0; } int specifier_boot_id(char specifier, void *data, void *userdata, char **ret) { sd_id128_t id; char *n; int r; r = sd_id128_get_boot(&id); if (r < 0) return r; n = new(char, 33); if (!n) return -ENOMEM; *ret = sd_id128_to_string(id, n); return 0; } int specifier_host_name(char specifier, void *data, void *userdata, char **ret) { char *n; n = gethostname_malloc(); if (!n) return -ENOMEM; *ret = n; return 0; } int specifier_kernel_release(char specifier, void *data, void *userdata, char **ret) { struct utsname uts; char *n; int r; r = uname(&uts); if (r < 0) return -errno; n = strdup(uts.release); if (!n) return -ENOMEM; *ret = n; return 0; }