2 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org)
3 * Copyright (C) 2001 - 2003 Jeff Dike (jdike@addtoit.com)
4 * Licensed under the GPL
11 #include <sys/socket.h>
12 #include <sys/types.h>
20 static struct mconsole_command commands[] = {
21 /* With uts namespaces, uts information becomes process-specific, so
22 * we need a process context. If we try handling this in interrupt
23 * context, we may hit an exiting process without a valid uts
26 { "version", mconsole_version, MCONSOLE_PROC },
27 { "halt", mconsole_halt, MCONSOLE_PROC },
28 { "reboot", mconsole_reboot, MCONSOLE_PROC },
29 { "config", mconsole_config, MCONSOLE_PROC },
30 { "remove", mconsole_remove, MCONSOLE_PROC },
31 { "sysrq", mconsole_sysrq, MCONSOLE_INTR },
32 { "help", mconsole_help, MCONSOLE_INTR },
33 { "cad", mconsole_cad, MCONSOLE_INTR },
34 { "stop", mconsole_stop, MCONSOLE_PROC },
35 { "go", mconsole_go, MCONSOLE_INTR },
36 { "log", mconsole_log, MCONSOLE_INTR },
37 { "proc", mconsole_proc, MCONSOLE_PROC },
38 { "stack", mconsole_stack, MCONSOLE_INTR },
41 /* Initialized in mconsole_init, which is an initcall */
42 char mconsole_socket_name[256];
44 int mconsole_reply_v0(struct mc_request *req, char *reply)
50 iov.iov_len = strlen(reply);
52 msg.msg_name = &(req->origin);
53 msg.msg_namelen = req->originlen;
56 msg.msg_control = NULL;
57 msg.msg_controllen = 0;
60 return sendmsg(req->originating_fd, &msg, 0);
63 static struct mconsole_command *mconsole_parse(struct mc_request *req)
65 struct mconsole_command *cmd;
68 for(i=0;i<sizeof(commands)/sizeof(commands[0]);i++){
70 if(!strncmp(req->request.data, cmd->command,
71 strlen(cmd->command))){
78 #define MIN(a,b) ((a)<(b) ? (a):(b))
81 #define STRING(x) STRINGX(x)
83 int mconsole_get_request(int fd, struct mc_request *req)
87 req->originlen = sizeof(req->origin);
88 req->len = recvfrom(fd, &req->request, sizeof(req->request), 0,
89 (struct sockaddr *) req->origin, &req->originlen);
93 req->originating_fd = fd;
95 if(req->request.magic != MCONSOLE_MAGIC){
96 /* Unversioned request */
97 len = MIN(sizeof(req->request.data) - 1,
98 strlen((char *) &req->request));
99 memmove(req->request.data, &req->request, len);
100 req->request.data[len] = '\0';
102 req->request.magic = MCONSOLE_MAGIC;
103 req->request.version = 0;
104 req->request.len = len;
106 mconsole_reply_v0(req, "ERR Version 0 mconsole clients are "
107 "not supported by this driver");
111 if(req->request.len >= MCONSOLE_MAX_DATA){
112 mconsole_reply(req, "Request too large", 1, 0);
115 if(req->request.version != MCONSOLE_VERSION){
116 mconsole_reply(req, "This driver only supports version "
117 STRING(MCONSOLE_VERSION) " clients", 1, 0);
120 req->request.data[req->request.len] = '\0';
121 req->cmd = mconsole_parse(req);
122 if(req->cmd == NULL){
123 mconsole_reply(req, "Unknown command", 1, 0);
130 int mconsole_reply_len(struct mc_request *req, const char *str, int total,
133 struct mconsole_reply reply;
139 /* err can only be true on the first packet */
142 len = MIN(total, MCONSOLE_MAX_DATA - 1);
144 if(len == total) reply.more = more;
147 memcpy(reply.data, str, len);
148 reply.data[len] = '\0';
153 len = sizeof(reply) + reply.len - sizeof(reply.data);
155 n = sendto(req->originating_fd, &reply, len, 0,
156 (struct sockaddr *) req->origin, req->originlen);
158 if(n < 0) return(-errno);
163 int mconsole_reply(struct mc_request *req, const char *str, int err, int more)
165 return mconsole_reply_len(req, str, strlen(str), err, more);
169 int mconsole_unlink_socket(void)
171 unlink(mconsole_socket_name);
175 static int notify_sock = -1;
177 int mconsole_notify(char *sock_name, int type, const void *data, int len)
179 struct sockaddr_un target;
180 struct mconsole_notify packet;
185 notify_sock = socket(PF_UNIX, SOCK_DGRAM, 0);
188 printk("mconsole_notify - socket failed, errno = %d\n",
197 target.sun_family = AF_UNIX;
198 strcpy(target.sun_path, sock_name);
200 packet.magic = MCONSOLE_MAGIC;
201 packet.version = MCONSOLE_VERSION;
203 len = (len > sizeof(packet.data)) ? sizeof(packet.data) : len;
205 memcpy(packet.data, data, len);
208 len = sizeof(packet) + packet.len - sizeof(packet.data);
209 n = sendto(notify_sock, &packet, len, 0, (struct sockaddr *) &target,
213 printk("mconsole_notify - sendto failed, errno = %d\n", errno);
219 * Overrides for Emacs so that we follow Linus's tabbing style.
220 * Emacs will notice this stuff at the end of the file and automatically
221 * adjust the settings for this buffer only. This must remain at the end
223 * ---------------------------------------------------------------------------
225 * c-file-style: "linux"