1 /* 2 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) 3 * Copyright (C) 2001 - 2003 Jeff Dike (jdike@addtoit.com) 4 * Licensed under the GPL 5 */ 6 7 #include <stdio.h> 8 #include <stdlib.h> 9 #include <errno.h> 10 #include <signal.h> 11 #include <sys/socket.h> 12 #include <sys/types.h> 13 #include <sys/uio.h> 14 #include <sys/un.h> 15 #include <unistd.h> 16 #include "user.h" 17 #include "mconsole.h" 18 #include "umid.h" 19 20 static struct mconsole_command commands[] = { 21 { "version", mconsole_version, MCONSOLE_INTR }, 22 { "halt", mconsole_halt, MCONSOLE_PROC }, 23 { "reboot", mconsole_reboot, MCONSOLE_PROC }, 24 { "config", mconsole_config, MCONSOLE_PROC }, 25 { "remove", mconsole_remove, MCONSOLE_PROC }, 26 { "sysrq", mconsole_sysrq, MCONSOLE_INTR }, 27 { "help", mconsole_help, MCONSOLE_INTR }, 28 { "cad", mconsole_cad, MCONSOLE_INTR }, 29 { "stop", mconsole_stop, MCONSOLE_PROC }, 30 { "go", mconsole_go, MCONSOLE_INTR }, 31 { "log", mconsole_log, MCONSOLE_INTR }, 32 { "proc", mconsole_proc, MCONSOLE_PROC }, 33 }; 34 35 /* Initialized in mconsole_init, which is an initcall */ 36 char mconsole_socket_name[256]; 37 38 int mconsole_reply_v0(struct mc_request *req, char *reply) 39 { 40 struct iovec iov; 41 struct msghdr msg; 42 43 iov.iov_base = reply; 44 iov.iov_len = strlen(reply); 45 46 msg.msg_name = &(req->origin); 47 msg.msg_namelen = req->originlen; 48 msg.msg_iov = &iov; 49 msg.msg_iovlen = 1; 50 msg.msg_control = NULL; 51 msg.msg_controllen = 0; 52 msg.msg_flags = 0; 53 54 return sendmsg(req->originating_fd, &msg, 0); 55 } 56 57 static struct mconsole_command *mconsole_parse(struct mc_request *req) 58 { 59 struct mconsole_command *cmd; 60 int i; 61 62 for(i=0;i<sizeof(commands)/sizeof(commands[0]);i++){ 63 cmd = &commands[i]; 64 if(!strncmp(req->request.data, cmd->command, 65 strlen(cmd->command))){ 66 return(cmd); 67 } 68 } 69 return(NULL); 70 } 71 72 #define MIN(a,b) ((a)<(b) ? (a):(b)) 73 74 #define STRINGX(x) #x 75 #define STRING(x) STRINGX(x) 76 77 int mconsole_get_request(int fd, struct mc_request *req) 78 { 79 int len; 80 81 req->originlen = sizeof(req->origin); 82 req->len = recvfrom(fd, &req->request, sizeof(req->request), 0, 83 (struct sockaddr *) req->origin, &req->originlen); 84 if (req->len < 0) 85 return 0; 86 87 req->originating_fd = fd; 88 89 if(req->request.magic != MCONSOLE_MAGIC){ 90 /* Unversioned request */ 91 len = MIN(sizeof(req->request.data) - 1, 92 strlen((char *) &req->request)); 93 memmove(req->request.data, &req->request, len); 94 req->request.data[len] = '\0'; 95 96 req->request.magic = MCONSOLE_MAGIC; 97 req->request.version = 0; 98 req->request.len = len; 99 100 mconsole_reply_v0(req, "ERR Version 0 mconsole clients are " 101 "not supported by this driver"); 102 return(0); 103 } 104 105 if(req->request.len >= MCONSOLE_MAX_DATA){ 106 mconsole_reply(req, "Request too large", 1, 0); 107 return(0); 108 } 109 if(req->request.version != MCONSOLE_VERSION){ 110 mconsole_reply(req, "This driver only supports version " 111 STRING(MCONSOLE_VERSION) " clients", 1, 0); 112 } 113 114 req->request.data[req->request.len] = '\0'; 115 req->cmd = mconsole_parse(req); 116 if(req->cmd == NULL){ 117 mconsole_reply(req, "Unknown command", 1, 0); 118 return(0); 119 } 120 121 return(1); 122 } 123 124 int mconsole_reply(struct mc_request *req, char *str, int err, int more) 125 { 126 struct mconsole_reply reply; 127 int total, len, n; 128 129 total = strlen(str); 130 do { 131 reply.err = err; 132 133 /* err can only be true on the first packet */ 134 err = 0; 135 136 len = MIN(total, MCONSOLE_MAX_DATA - 1); 137 138 if(len == total) reply.more = more; 139 else reply.more = 1; 140 141 memcpy(reply.data, str, len); 142 reply.data[len] = '\0'; 143 total -= len; 144 str += len; 145 reply.len = len + 1; 146 147 len = sizeof(reply) + reply.len - sizeof(reply.data); 148 149 n = sendto(req->originating_fd, &reply, len, 0, 150 (struct sockaddr *) req->origin, req->originlen); 151 152 if(n < 0) return(-errno); 153 } while(total > 0); 154 return(0); 155 } 156 157 int mconsole_unlink_socket(void) 158 { 159 unlink(mconsole_socket_name); 160 return 0; 161 } 162 163 static int notify_sock = -1; 164 165 int mconsole_notify(char *sock_name, int type, const void *data, int len) 166 { 167 struct sockaddr_un target; 168 struct mconsole_notify packet; 169 int n, err = 0; 170 171 lock_notify(); 172 if(notify_sock < 0){ 173 notify_sock = socket(PF_UNIX, SOCK_DGRAM, 0); 174 if(notify_sock < 0){ 175 printk("mconsole_notify - socket failed, errno = %d\n", 176 errno); 177 err = -errno; 178 } 179 } 180 unlock_notify(); 181 182 if(err) 183 return(err); 184 185 target.sun_family = AF_UNIX; 186 strcpy(target.sun_path, sock_name); 187 188 packet.magic = MCONSOLE_MAGIC; 189 packet.version = MCONSOLE_VERSION; 190 packet.type = type; 191 len = (len > sizeof(packet.data)) ? sizeof(packet.data) : len; 192 packet.len = len; 193 memcpy(packet.data, data, len); 194 195 err = 0; 196 len = sizeof(packet) + packet.len - sizeof(packet.data); 197 n = sendto(notify_sock, &packet, len, 0, (struct sockaddr *) &target, 198 sizeof(target)); 199 if(n < 0){ 200 printk("mconsole_notify - sendto failed, errno = %d\n", errno); 201 err = -errno; 202 } 203 return(err); 204 } 205 206 /* 207 * Overrides for Emacs so that we follow Linus's tabbing style. 208 * Emacs will notice this stuff at the end of the file and automatically 209 * adjust the settings for this buffer only. This must remain at the end 210 * of the file. 211 * --------------------------------------------------------------------------- 212 * Local variables: 213 * c-file-style: "linux" 214 * End: 215 */ 216