404 lines
9.3 KiB
C
404 lines
9.3 KiB
C
/*
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* Copyright (c) 2024 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* service.c
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* Start and stop services.
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*/
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/un.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <getopt.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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static bool array_add(void*** array_ptr,
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size_t* used_ptr,
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size_t* length_ptr,
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void* value)
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{
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void** array;
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memcpy(&array, array_ptr, sizeof(array)); // Strict aliasing.
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if ( *used_ptr == *length_ptr )
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{
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size_t length = *length_ptr;
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if ( !length )
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length = 4;
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void** new_array = reallocarray(array, length, 2 * sizeof(void*));
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if ( !new_array )
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return false;
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array = new_array;
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memcpy(array_ptr, &array, sizeof(array)); // Strict aliasing.
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*length_ptr = length * 2;
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}
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memcpy(array + (*used_ptr)++, &value, sizeof(value)); // Strict aliasing.
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return true;
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}
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static char** tokenize(size_t* out_tokens_used, const char* string)
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{
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size_t tokens_used = 0;
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size_t tokens_length = 0;
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char** tokens = malloc(sizeof(char*));
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if ( !tokens )
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return NULL;
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bool failed = false;
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bool invalid = false;
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while ( *string )
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{
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if ( isspace((unsigned char) *string) )
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{
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string++;
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continue;
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}
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if ( *string == '#' )
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break;
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char* token;
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size_t token_size;
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FILE* fp = open_memstream(&token, &token_size);
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if ( !fp )
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{
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failed = true;
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break;
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}
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bool singly = false;
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bool doubly = false;
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bool escaped = false;
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for ( char c = *string++; c; c = *string++ )
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{
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if ( !escaped && !singly && !doubly && isspace((unsigned char) c) )
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break;
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if ( !escaped && !doubly && c == '\'' )
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{
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singly = !singly;
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continue;
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}
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if ( !escaped && !singly && c == '"' )
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{
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doubly = !doubly;
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continue;
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}
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if ( !singly && !escaped && c == '\\' )
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{
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escaped = true;
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continue;
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}
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if ( escaped )
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{
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switch ( c )
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{
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case 'a': c = '\a'; break;
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case 'b': c = '\b'; break;
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case 'e': c = '\e'; break;
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case 'f': c = '\f'; break;
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case 'n': c = '\n'; break;
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case 'r': c = '\r'; break;
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case 't': c = '\t'; break;
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case 'v': c = '\v'; break;
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default: break;
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};
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}
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escaped = false;
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if ( fputc((unsigned char) c, fp) == EOF )
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{
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failed = true;
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break;
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}
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}
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if ( singly || doubly || escaped )
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{
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fclose(fp);
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free(token);
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invalid = true;
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break;
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}
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if ( fflush(fp) == EOF )
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{
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fclose(fp);
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free(token);
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failed = true;
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break;
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}
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fclose(fp);
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if ( !array_add((void***) &tokens, &tokens_used, &tokens_length,
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token) )
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{
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free(token);
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failed = true;
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break;
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}
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}
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if ( failed || invalid )
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{
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for ( size_t i = 0; i < tokens_used; i++ )
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free(tokens[i]);
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free(tokens);
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if ( invalid )
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errno = 0;
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return NULL;
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}
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char** new_tokens = reallocarray(tokens, tokens_used, sizeof(char*));
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if ( new_tokens )
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tokens = new_tokens;
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*out_tokens_used = tokens_used;
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return tokens;
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}
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static int open_local_client_socket(const char* path, int flags)
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{
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size_t path_length = strlen(path);
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size_t addr_size = offsetof(struct sockaddr_un, sun_path) + path_length + 1;
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struct sockaddr_un* sockaddr = malloc(addr_size);
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if ( !sockaddr )
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return -1;
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sockaddr->sun_family = AF_LOCAL;
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strcpy(sockaddr->sun_path, path);
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int fd = socket(AF_LOCAL, SOCK_STREAM | flags, 0);
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if ( fd < 0 )
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return free(sockaddr), -1;
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if ( connect(fd, (const struct sockaddr*) sockaddr, addr_size) < 0 )
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return close(fd), free(sockaddr), -1;
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free(sockaddr);
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return fd;
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}
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static void rewrite(const char* path, const char* daemon, const char* flags)
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{
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FILE* fp = fopen(path, "r");
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if ( !fp )
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{
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if ( errno != ENOENT )
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err(1, "%s", path);
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}
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char* out_path;
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if ( asprintf(&out_path, "%s.XXXXXX", path) < 0 )
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err(1, "malloc");
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int out_fd = mkstemp(out_path);
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if ( out_fd < 0 )
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err(1, "mkstemp: %s.XXXXXX", path);
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FILE* out = fdopen(out_fd, "w");
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if ( !out )
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{
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unlink(out_path);
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err(1, "fdopen");
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}
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bool found = false;
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char* line = NULL;
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size_t line_size = 0;
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ssize_t line_length;
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off_t line_number = 0;
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while ( fp && 0 < (line_length = getline(&line, &line_size, fp)) )
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{
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line_number++;
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size_t tokenc;
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char** tokens = tokenize(&tokenc, line);
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if ( !tokens )
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{
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unlink(out_path);
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if ( errno )
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err(1, "%s", path);
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else
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errx(1, "%s:%ji: Syntax error", path, (intmax_t) line_number);
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}
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if ( 2 <= tokenc &&
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!strcmp(tokens[0], "require") && !strcmp(tokens[1], daemon) )
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{
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found = true;
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if ( flags )
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fprintf(out, "require %s%s\n", daemon, flags);
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}
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else
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fputs(line, out);
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}
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free(line);
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if ( !found && flags )
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fprintf(out, "require %s%s\n", daemon, flags);
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if ( (fp && ferror(fp)) || ferror(out) || fflush(out) == EOF )
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{
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unlink(out_path);
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err(1, "%s", path);
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}
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if ( fp )
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{
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struct stat st;
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fstat(fileno(fp), &st);
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fchmod(out_fd, st.st_mode & 07777);
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fchown(out_fd, st.st_uid, st.st_gid);
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fclose(fp);
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}
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else
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fchmod(out_fd, 0666 & ~getumask());
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if ( rename(out_path, path) < 0 )
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{
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unlink(out_path);
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err(1, "rename: %s -> %s", out_path, path);
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}
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fclose(out);
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}
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static bool check_daemon_exists_in_dir(const char* dir, const char* daemon)
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{
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char* path;
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if ( asprintf(&path, "%s/%s", dir, daemon) < 0 )
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err(1, "malloc");
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bool result = !access(path, F_OK);
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free(path);
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return result;
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}
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static void check_daemon_exists(const char* daemon)
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{
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if ( !check_daemon_exists_in_dir("/etc/init", daemon) &&
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!check_daemon_exists_in_dir("/share/init", daemon) )
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errx(1, "%s: Daemon does not exist", daemon);
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}
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int main(int argc, char* argv[])
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{
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const char* init_socket = getenv("INIT_SOCKET");
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if ( !init_socket )
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init_socket = "/var/run/init";
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bool exit_code = false;
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bool no_await = false;
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bool optional = true;
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bool raw = false;
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const char* source = "local";
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const struct option longopts[] =
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{
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{"exit-code", no_argument, NULL, 256},
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{"no-await", no_argument, NULL, 257},
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{"no-optional", no_argument, NULL, 258},
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{"source", required_argument, NULL, 't'},
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{"raw", no_argument, NULL, 'r'},
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{0, 0, 0, 0}
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};
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const char* opts = "rs:";
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int opt;
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while ( (opt = getopt_long(argc, argv, opts, longopts, NULL)) != -1 )
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{
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switch ( opt )
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{
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case 'r': raw = true; break;
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case 's': source = optarg; break;
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case 256: exit_code = true; break;
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case 257: no_await = true; break;
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case 258: optional = false; break;
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default: return 2;
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}
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}
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int fd = open_local_client_socket(init_socket, 0);
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if ( fd < 0 )
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err(1, "%s", init_socket);
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if ( raw )
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{
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for ( int i = optind; i < argc; i++ )
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{
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if ( dprintf(fd, "%s%c", argv[i], i + 1 == argc ? '\n' : ' ') < 0 )
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err(1, "%s", init_socket);
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}
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return 0;
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}
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if ( argc - optind < 2 )
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errx(1, "usage: <daemon> <command>");
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const char* daemon = argv[optind++];
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const char* command = argv[optind++];
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char flags[sizeof(" optional no-await exit-code")];
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snprintf(flags, sizeof(flags), "%s%s%s",
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optional ? " optional" : "",
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no_await ? " no-await" : "",
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exit_code ? " exit-code" : "");
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char* source_path;
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if ( asprintf(&source_path, "/etc/init/%s", source) < 0 )
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err(1, "malloc");
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if ( !strcmp(command, "enable") )
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{
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check_daemon_exists(daemon);
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rewrite(source_path, daemon, flags);
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if ( dprintf(fd, "require %s %s start\n", source, daemon) < 0 )
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err(1, "%s", init_socket);
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}
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else if ( !strcmp(command, "disable") )
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{
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rewrite(source_path, daemon, NULL);
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if ( dprintf(fd, "unrequire %s %s\n", source, daemon) < 0 )
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err(1, "%s", init_socket);
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}
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else if ( !strcmp(command, "start") )
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{
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if ( dprintf(fd, "require %s %s start\n", source, daemon) < 0 )
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err(1, "%s", init_socket);
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}
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else if ( !strcmp(command, "stop") )
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{
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if ( dprintf(fd, "unrequire %s %s\n", source, daemon) < 0 )
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err(1, "%s", init_socket);
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}
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else if ( !strcmp(command, "restart") )
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{
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if ( dprintf(fd, "restart %s\n", daemon) < 0 )
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err(1, "%s", init_socket);
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}
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else if ( !strcmp(command, "reload") )
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{
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if ( dprintf(fd, "reload %s\n", daemon) < 0 )
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err(1, "%s", init_socket);
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}
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else if ( !strcmp(command, "reconfigure") )
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{
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if ( dprintf(fd, "reconfigure %s\n", daemon) < 0 )
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err(1, "%s", init_socket);
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}
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else if ( !strcmp(command, "terminate") )
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{
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if ( dprintf(fd, "terminate %s\n", daemon) < 0 )
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err(1, "%s", init_socket);
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}
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else if ( !strcmp(command, "kill") )
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{
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if ( dprintf(fd, "kill %s\n", daemon) < 0 )
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err(1, "%s", init_socket);
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}
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// TODO: --list
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// TODO: status
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// TODO: signal
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// TODO: pid
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// TODO: requirements
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// TODO: log
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else
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errx(1, "unknown command: %s", command);
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return 0;
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}
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