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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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"
Al Viro3a512372006-10-24 11:15:29 +010017#include "sysdep/ptrace.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include "mconsole.h"
Jeff Dikede5fe762007-02-10 01:44:25 -080019#include "os.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
21static struct mconsole_command commands[] = {
Jeff Dike2d77f6f2006-07-10 04:45:16 -070022 /* With uts namespaces, uts information becomes process-specific, so
23 * we need a process context. If we try handling this in interrupt
24 * context, we may hit an exiting process without a valid uts
25 * namespace.
26 */
27 { "version", mconsole_version, MCONSOLE_PROC },
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 { "halt", mconsole_halt, MCONSOLE_PROC },
29 { "reboot", mconsole_reboot, MCONSOLE_PROC },
30 { "config", mconsole_config, MCONSOLE_PROC },
31 { "remove", mconsole_remove, MCONSOLE_PROC },
Paolo 'Blaisorblade' Giarrussobd948052005-09-30 11:59:00 -070032 { "sysrq", mconsole_sysrq, MCONSOLE_INTR },
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 { "help", mconsole_help, MCONSOLE_INTR },
34 { "cad", mconsole_cad, MCONSOLE_INTR },
35 { "stop", mconsole_stop, MCONSOLE_PROC },
36 { "go", mconsole_go, MCONSOLE_INTR },
37 { "log", mconsole_log, MCONSOLE_INTR },
38 { "proc", mconsole_proc, MCONSOLE_PROC },
Jeff Dike3eddddc2005-09-16 19:27:46 -070039 { "stack", mconsole_stack, MCONSOLE_INTR },
Linus Torvalds1da177e2005-04-16 15:20:36 -070040};
41
42/* Initialized in mconsole_init, which is an initcall */
43char mconsole_socket_name[256];
44
45int mconsole_reply_v0(struct mc_request *req, char *reply)
46{
47 struct iovec iov;
48 struct msghdr msg;
49
50 iov.iov_base = reply;
51 iov.iov_len = strlen(reply);
52
53 msg.msg_name = &(req->origin);
54 msg.msg_namelen = req->originlen;
55 msg.msg_iov = &iov;
56 msg.msg_iovlen = 1;
57 msg.msg_control = NULL;
58 msg.msg_controllen = 0;
59 msg.msg_flags = 0;
60
61 return sendmsg(req->originating_fd, &msg, 0);
62}
63
64static struct mconsole_command *mconsole_parse(struct mc_request *req)
65{
66 struct mconsole_command *cmd;
67 int i;
68
Jeff Dike91b165c2006-09-25 23:33:00 -070069 for(i = 0; i < ARRAY_SIZE(commands); i++){
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 cmd = &commands[i];
71 if(!strncmp(req->request.data, cmd->command,
72 strlen(cmd->command))){
Jeff Dike91b165c2006-09-25 23:33:00 -070073 return cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 }
75 }
Jeff Dike91b165c2006-09-25 23:33:00 -070076 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077}
78
79#define MIN(a,b) ((a)<(b) ? (a):(b))
80
81#define STRINGX(x) #x
82#define STRING(x) STRINGX(x)
83
84int mconsole_get_request(int fd, struct mc_request *req)
85{
86 int len;
87
88 req->originlen = sizeof(req->origin);
Eduard-Gabriel Munteanu89df6bf2007-07-15 23:38:51 -070089 req->len = recvfrom(fd, &req->request, sizeof(req->request),
90 MSG_DONTWAIT, (struct sockaddr *) req->origin,
91 &req->originlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 if (req->len < 0)
93 return 0;
94
95 req->originating_fd = fd;
96
97 if(req->request.magic != MCONSOLE_MAGIC){
98 /* Unversioned request */
99 len = MIN(sizeof(req->request.data) - 1,
100 strlen((char *) &req->request));
101 memmove(req->request.data, &req->request, len);
102 req->request.data[len] = '\0';
103
104 req->request.magic = MCONSOLE_MAGIC;
105 req->request.version = 0;
106 req->request.len = len;
107
108 mconsole_reply_v0(req, "ERR Version 0 mconsole clients are "
109 "not supported by this driver");
110 return(0);
111 }
112
113 if(req->request.len >= MCONSOLE_MAX_DATA){
114 mconsole_reply(req, "Request too large", 1, 0);
115 return(0);
116 }
117 if(req->request.version != MCONSOLE_VERSION){
118 mconsole_reply(req, "This driver only supports version "
119 STRING(MCONSOLE_VERSION) " clients", 1, 0);
120 }
121
122 req->request.data[req->request.len] = '\0';
123 req->cmd = mconsole_parse(req);
124 if(req->cmd == NULL){
125 mconsole_reply(req, "Unknown command", 1, 0);
126 return(0);
127 }
128
129 return(1);
130}
131
Jeff Dike7b033e12006-01-06 00:19:03 -0800132int mconsole_reply_len(struct mc_request *req, const char *str, int total,
133 int err, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134{
Jeff Dikef92afe52006-09-29 01:58:52 -0700135 /* XXX This is a stack consumption problem. It'd be nice to
136 * make it global and serialize access to it, but there are a
137 * ton of callers to this function.
138 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 struct mconsole_reply reply;
Jeff Dike7b033e12006-01-06 00:19:03 -0800140 int len, n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 do {
143 reply.err = err;
144
145 /* err can only be true on the first packet */
146 err = 0;
147
148 len = MIN(total, MCONSOLE_MAX_DATA - 1);
149
150 if(len == total) reply.more = more;
151 else reply.more = 1;
152
153 memcpy(reply.data, str, len);
154 reply.data[len] = '\0';
155 total -= len;
156 str += len;
157 reply.len = len + 1;
158
159 len = sizeof(reply) + reply.len - sizeof(reply.data);
160
161 n = sendto(req->originating_fd, &reply, len, 0,
162 (struct sockaddr *) req->origin, req->originlen);
163
164 if(n < 0) return(-errno);
165 } while(total > 0);
166 return(0);
167}
168
Jeff Dike7b033e12006-01-06 00:19:03 -0800169int mconsole_reply(struct mc_request *req, const char *str, int err, int more)
170{
171 return mconsole_reply_len(req, str, strlen(str), err, more);
172}
173
174
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175int mconsole_unlink_socket(void)
176{
177 unlink(mconsole_socket_name);
178 return 0;
179}
180
181static int notify_sock = -1;
182
183int mconsole_notify(char *sock_name, int type, const void *data, int len)
184{
185 struct sockaddr_un target;
186 struct mconsole_notify packet;
187 int n, err = 0;
188
189 lock_notify();
190 if(notify_sock < 0){
191 notify_sock = socket(PF_UNIX, SOCK_DGRAM, 0);
192 if(notify_sock < 0){
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 err = -errno;
Jeff Dikeb4fd3102005-09-16 19:27:49 -0700194 printk("mconsole_notify - socket failed, errno = %d\n",
195 err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 }
197 }
198 unlock_notify();
199
200 if(err)
201 return(err);
202
203 target.sun_family = AF_UNIX;
204 strcpy(target.sun_path, sock_name);
205
206 packet.magic = MCONSOLE_MAGIC;
207 packet.version = MCONSOLE_VERSION;
208 packet.type = type;
209 len = (len > sizeof(packet.data)) ? sizeof(packet.data) : len;
210 packet.len = len;
211 memcpy(packet.data, data, len);
212
213 err = 0;
214 len = sizeof(packet) + packet.len - sizeof(packet.data);
215 n = sendto(notify_sock, &packet, len, 0, (struct sockaddr *) &target,
216 sizeof(target));
217 if(n < 0){
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 err = -errno;
Jeff Dikeb4fd3102005-09-16 19:27:49 -0700219 printk("mconsole_notify - sendto failed, errno = %d\n", errno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 }
221 return(err);
222}
223
224/*
225 * Overrides for Emacs so that we follow Linus's tabbing style.
226 * Emacs will notice this stuff at the end of the file and automatically
227 * adjust the settings for this buffer only. This must remain at the end
228 * of the file.
229 * ---------------------------------------------------------------------------
230 * Local variables:
231 * c-file-style: "linux"
232 * End:
233 */