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271 lines
5.7 KiB
271 lines
5.7 KiB
4 months ago
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/*
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* Copyright 2022 Collabora, Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "config.h"
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#include <assert.h>
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#include <ctype.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <wayland-util.h>
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#include "helpers.h"
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#include "os-compatibility.h"
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#include "process-util.h"
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#include "string-helpers.h"
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extern char **environ; /* defined by libc */
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void
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fdstr_update_str1(struct fdstr *s)
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{
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snprintf(s->str1, sizeof(s->str1), "%d", s->fds[1]);
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}
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void
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fdstr_set_fd1(struct fdstr *s, int fd)
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{
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s->fds[0] = -1;
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s->fds[1] = fd;
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fdstr_update_str1(s);
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}
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bool
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fdstr_clear_cloexec_fd1(struct fdstr *s)
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{
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return os_fd_clear_cloexec(s->fds[1]) >= 0;
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}
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void
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fdstr_close_all(struct fdstr *s)
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{
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unsigned i;
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for (i = 0; i < ARRAY_LENGTH(s->fds); i++) {
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close(s->fds[i]);
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s->fds[i] = -1;
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}
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}
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void
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custom_env_init_from_environ(struct custom_env *env)
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{
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char **it;
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char **ep;
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wl_array_init(&env->envp);
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env->env_finalized = false;
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wl_array_init(&env->argp);
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env->arg_finalized = false;
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for (it = environ; *it; it++) {
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ep = wl_array_add(&env->envp, sizeof *ep);
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assert(ep);
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*ep = strdup(*it);
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assert(*ep);
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}
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}
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void
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custom_env_fini(struct custom_env *env)
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{
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char **p;
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wl_array_for_each(p, &env->envp)
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free(*p);
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wl_array_release(&env->envp);
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wl_array_for_each(p, &env->argp)
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free(*p);
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wl_array_release(&env->argp);
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}
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static char **
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custom_env_get_env_var(struct custom_env *env, const char *name)
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{
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char **ep;
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size_t name_len = strlen(name);
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wl_array_for_each(ep, &env->envp) {
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char *entry = *ep;
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if (strncmp(entry, name, name_len) == 0 &&
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entry[name_len] == '=') {
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return ep;
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}
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}
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return NULL;
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}
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void
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custom_env_add_arg(struct custom_env *env, const char *arg)
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{
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char **ap;
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assert(!env->arg_finalized);
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ap = wl_array_add(&env->argp, sizeof *ap);
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assert(ap);
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*ap = strdup(arg);
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assert(*ap);
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}
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void
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custom_env_set_env_var(struct custom_env *env, const char *name, const char *value)
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{
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char **ep;
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assert(strchr(name, '=') == NULL);
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assert(!env->env_finalized);
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ep = custom_env_get_env_var(env, name);
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if (ep)
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free(*ep);
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else
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ep = wl_array_add(&env->envp, sizeof *ep);
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assert(ep);
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str_printf(ep, "%s=%s", name, value);
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assert(*ep);
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}
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/**
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* Add information from a parsed exec string to a custom_env
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*
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* An 'exec string' is a string in the format:
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* ENVFOO=bar ENVBAR=baz /path/to/exec --arg anotherarg
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*
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* This function will parse such a string and add the specified environment
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* variables (in the format KEY=value) up until it sees a non-environment
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* string, after which point every entry will be interpreted as a new
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* argument.
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*
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* Entries are space-separated; there is no support for quoting.
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*/
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void
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custom_env_add_from_exec_string(struct custom_env *env, const char *exec_str)
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{
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char *dup_path = strdup(exec_str);
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char *start = dup_path;
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assert(dup_path);
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/* Build the environment array (if any) by handling any number of
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* equal-separated key=value at the start of the string, split by
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* spaces; uses "foo=bar baz=quux meh argh" as the example, where
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* "foo=bar" and "baz=quux" should go into the environment, and
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* "meh" should be executed with "argh" as its first argument */
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while (*start) {
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char *k = NULL, *v = NULL;
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char *p;
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/* Leaves us with "foo\0bar baz=quux meh argh", with k pointing
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* to "foo" and v pointing to "bar baz=quux meh argh" */
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for (p = start; *p && !isspace(*p); p++) {
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if (*p == '=') {
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*p++ = '\0';
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k = start;
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v = p;
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break;
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}
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}
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if (!v)
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break;
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/* Walk to the next space or NUL, filling any trailing spaces
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* with NUL, to give us "foo\0bar\0\0baz=quux meh argh".
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* k will point to "foo", v will point to "bar", and
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* start will point to "baz=quux meh argh". */
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while (*p && !isspace(*p))
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p++;
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while (*p && isspace(*p))
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*p++ = '\0';
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start = p;
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custom_env_set_env_var(env, k, v);
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}
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/* Now build the argv array by splitting on spaces */
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while (*start) {
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char *p;
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bool valid = false;
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for (p = start; *p && !isspace(*p); p++)
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valid = true;
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if (!valid)
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break;
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while (*p && isspace(*p))
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*p++ = '\0';
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custom_env_add_arg(env, start);
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start = p;
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}
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free(dup_path);
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}
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char *const *
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custom_env_get_envp(struct custom_env *env)
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{
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char **ep;
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assert(!env->env_finalized);
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/* add terminating NULL */
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ep = wl_array_add(&env->envp, sizeof *ep);
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assert(ep);
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*ep = NULL;
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env->env_finalized = true;
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return env->envp.data;
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}
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char *const *
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custom_env_get_argp(struct custom_env *env)
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{
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char **ap;
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assert(!env->arg_finalized);
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/* add terminating NULL */
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ap = wl_array_add(&env->argp, sizeof *ap);
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assert(ap);
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*ap = NULL;
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env->arg_finalized = true;
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return env->argp.data;
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}
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