1 /* $NetBSD: slave.c,v 1.8 2020/10/24 04:46:17 blymn Exp $ */ 2 3 /*- 4 * Copyright 2009 Brett Lymn <blymn@NetBSD.org> 5 * 6 * All rights reserved. 7 * 8 * This code has been donated to The NetBSD Foundation by the Author. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. The name of the author may not be used to endorse or promote products 16 * derived from this software withough specific prior written permission 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * 30 */ 31 #include <fcntl.h> 32 #include <sys/ioctl.h> 33 #include <unistd.h> 34 #include <err.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <curses.h> 39 #include "returns.h" 40 #include "slave.h" 41 42 int cmdpipe[2]; 43 int slvpipe[2]; 44 int initdone = 0; 45 46 #if 0 47 static const char *returns_enum_names[] = { 48 "unused", "numeric", "string", "byte", "ERR", "OK", "NULL", "not NULL", 49 "variable" 50 }; 51 #endif 52 53 /* 54 * Read the command pipe for the function to execute, gather the args 55 * and then process the command. 56 */ 57 static void 58 process_commands(void) 59 { 60 int len, maxlen, argslen, i, ret, type; 61 char *cmdbuf, *tmpbuf, **args, **tmpargs; 62 63 len = maxlen = 30; 64 if ((cmdbuf = malloc(maxlen)) == NULL) 65 err(1, "slave cmdbuf malloc failed"); 66 67 while(1) { 68 if (read(cmdpipe[READ_PIPE], &type, sizeof(int)) < 0) 69 err(1, "slave command type read failed"); 70 71 if (type != data_string) 72 errx(1, "Unexpected type for command, got %d", type); 73 74 if (read(cmdpipe[READ_PIPE], &len, sizeof(int)) < 0) 75 err(1, "slave command len read failed"); 76 77 if ((len + 1) > maxlen) { 78 maxlen = len + 1; 79 if ((tmpbuf = realloc(cmdbuf, maxlen)) == NULL) 80 err(1, "slave cmdbuf realloc to %d " 81 "bytes failed", maxlen); 82 cmdbuf = tmpbuf; 83 } 84 85 if (read(cmdpipe[READ_PIPE], cmdbuf, len) < 0) 86 err(1, "slave command read failed"); 87 cmdbuf[len] = '\0'; 88 argslen = 0; 89 args = NULL; 90 91 do { 92 if (read(cmdpipe[READ_PIPE], &type, sizeof(int)) < 0) 93 err(1, "slave arg type read failed"); 94 95 if (read(cmdpipe[READ_PIPE], &len, sizeof(int)) < 0) 96 err(1, "slave arg len read failed"); 97 98 if (len >= 0) { 99 tmpargs = realloc(args, 100 (argslen + 1) * sizeof(char *)); 101 if (tmpargs == NULL) 102 err(1, "slave realloc of args array " 103 "failed"); 104 105 args = tmpargs; 106 if (type != data_null) { 107 args[argslen] = malloc(len + 1); 108 109 if (args[argslen] == NULL) 110 err(1, "slave alloc of %d bytes" 111 " for args failed", len); 112 } 113 114 if (len == 0) { 115 if (type == data_null) 116 args[argslen] = NULL; 117 else 118 args[argslen][0] = '\0'; 119 } else { 120 read(cmdpipe[READ_PIPE], args[argslen], 121 len); 122 if (type != data_byte) 123 args[argslen][len] = '\0'; 124 125 if (len == 6) { 126 if (strcmp(args[argslen], 127 "STDSCR") == 0) { 128 ret = asprintf(&tmpbuf, 129 "%p", 130 stdscr); 131 if (ret < 0) 132 err(2, 133 "asprintf of stdscr failed"); 134 free(args[argslen]); 135 args[argslen] = tmpbuf; 136 } 137 } 138 } 139 140 argslen++; 141 } 142 } 143 while(len >= 0); 144 145 command_execute(cmdbuf, argslen, args); 146 147 if (args != NULL) { 148 for (i = 0; i < argslen; i++) 149 free(args[i]); 150 151 free(args); 152 } 153 } 154 } 155 156 int 157 main(int argc, char *argv[]) 158 { 159 if (argc != 5) { 160 fprintf(stderr, "Usage: %s <cmdin> <cmdout> <slvin> <slvout>\n", 161 getprogname()); 162 return 0; 163 } 164 sscanf(argv[1], "%d", &cmdpipe[0]); 165 sscanf(argv[2], "%d", &cmdpipe[1]); 166 sscanf(argv[3], "%d", &slvpipe[0]); 167 sscanf(argv[4], "%d", &slvpipe[1]); 168 169 process_commands(); 170 171 return 0; 172 } 173