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Linux/arch/um/drivers/mconsole_user.c

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  1 /*
  2  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org)
  3  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  4  * Licensed under the GPL
  5  */
  6 
  7 #include <errno.h>
  8 #include <string.h>
  9 #include <unistd.h>
 10 #include <sys/socket.h>
 11 #include <sys/uio.h>
 12 #include <sys/un.h>
 13 #include "mconsole.h"
 14 
 15 static struct mconsole_command commands[] = {
 16         /*
 17          * With uts namespaces, uts information becomes process-specific, so
 18          * we need a process context.  If we try handling this in interrupt
 19          * context, we may hit an exiting process without a valid uts
 20          * namespace.
 21          */
 22         { "version", mconsole_version, MCONSOLE_PROC },
 23         { "halt", mconsole_halt, MCONSOLE_PROC },
 24         { "reboot", mconsole_reboot, MCONSOLE_PROC },
 25         { "config", mconsole_config, MCONSOLE_PROC },
 26         { "remove", mconsole_remove, MCONSOLE_PROC },
 27         { "sysrq", mconsole_sysrq, MCONSOLE_INTR },
 28         { "help", mconsole_help, MCONSOLE_INTR },
 29         { "cad", mconsole_cad, MCONSOLE_INTR },
 30         { "stop", mconsole_stop, MCONSOLE_PROC },
 31         { "go", mconsole_go, MCONSOLE_INTR },
 32         { "log", mconsole_log, MCONSOLE_INTR },
 33         { "proc", mconsole_proc, MCONSOLE_PROC },
 34         { "stack", mconsole_stack, MCONSOLE_INTR },
 35 };
 36 
 37 /* Initialized in mconsole_init, which is an initcall */
 38 char mconsole_socket_name[256];
 39 
 40 static int mconsole_reply_v0(struct mc_request *req, char *reply)
 41 {
 42         struct iovec iov;
 43         struct msghdr msg;
 44 
 45         iov.iov_base = reply;
 46         iov.iov_len = strlen(reply);
 47 
 48         msg.msg_name = &(req->origin);
 49         msg.msg_namelen = req->originlen;
 50         msg.msg_iov = &iov;
 51         msg.msg_iovlen = 1;
 52         msg.msg_control = NULL;
 53         msg.msg_controllen = 0;
 54         msg.msg_flags = 0;
 55 
 56         return sendmsg(req->originating_fd, &msg, 0);
 57 }
 58 
 59 static struct mconsole_command *mconsole_parse(struct mc_request *req)
 60 {
 61         struct mconsole_command *cmd;
 62         int i;
 63 
 64         for (i = 0; i < ARRAY_SIZE(commands); i++) {
 65                 cmd = &commands[i];
 66                 if (!strncmp(req->request.data, cmd->command,
 67                             strlen(cmd->command))) {
 68                         return cmd;
 69                 }
 70         }
 71         return NULL;
 72 }
 73 
 74 #define MIN(a,b) ((a)<(b) ? (a):(b))
 75 
 76 #define STRINGX(x) #x
 77 #define STRING(x) STRINGX(x)
 78 
 79 int mconsole_get_request(int fd, struct mc_request *req)
 80 {
 81         int len;
 82 
 83         req->originlen = sizeof(req->origin);
 84         req->len = recvfrom(fd, &req->request, sizeof(req->request), 0,
 85                             (struct sockaddr *) req->origin, &req->originlen);
 86         if (req->len < 0)
 87                 return 0;
 88 
 89         req->originating_fd = fd;
 90 
 91         if (req->request.magic != MCONSOLE_MAGIC) {
 92                 /* Unversioned request */
 93                 len = MIN(sizeof(req->request.data) - 1,
 94                           strlen((char *) &req->request));
 95                 memmove(req->request.data, &req->request, len);
 96                 req->request.data[len] = '\0';
 97 
 98                 req->request.magic = MCONSOLE_MAGIC;
 99                 req->request.version = 0;
100                 req->request.len = len;
101 
102                 mconsole_reply_v0(req, "ERR Version 0 mconsole clients are "
103                                   "not supported by this driver");
104                 return 0;
105         }
106 
107         if (req->request.len >= MCONSOLE_MAX_DATA) {
108                 mconsole_reply(req, "Request too large", 1, 0);
109                 return 0;
110         }
111         if (req->request.version != MCONSOLE_VERSION) {
112                 mconsole_reply(req, "This driver only supports version "
113                                STRING(MCONSOLE_VERSION) " clients", 1, 0);
114         }
115 
116         req->request.data[req->request.len] = '\0';
117         req->cmd = mconsole_parse(req);
118         if (req->cmd == NULL) {
119                 mconsole_reply(req, "Unknown command", 1, 0);
120                 return 0;
121         }
122 
123         return 1;
124 }
125 
126 int mconsole_reply_len(struct mc_request *req, const char *str, int total,
127                        int err, int more)
128 {
129         /*
130          * XXX This is a stack consumption problem.  It'd be nice to
131          * make it global and serialize access to it, but there are a
132          * ton of callers to this function.
133          */
134         struct mconsole_reply reply;
135         int len, n;
136 
137         do {
138                 reply.err = err;
139 
140                 /* err can only be true on the first packet */
141                 err = 0;
142 
143                 len = MIN(total, MCONSOLE_MAX_DATA - 1);
144 
145                 if (len == total) reply.more = more;
146                 else reply.more = 1;
147 
148                 memcpy(reply.data, str, len);
149                 reply.data[len] = '\0';
150                 total -= len;
151                 str += len;
152                 reply.len = len + 1;
153 
154                 len = sizeof(reply) + reply.len - sizeof(reply.data);
155 
156                 n = sendto(req->originating_fd, &reply, len, 0,
157                            (struct sockaddr *) req->origin, req->originlen);
158 
159                 if (n < 0)
160                         return -errno;
161         } while (total > 0);
162         return 0;
163 }
164 
165 int mconsole_reply(struct mc_request *req, const char *str, int err, int more)
166 {
167         return mconsole_reply_len(req, str, strlen(str), err, more);
168 }
169 
170 
171 int mconsole_unlink_socket(void)
172 {
173         unlink(mconsole_socket_name);
174         return 0;
175 }
176 
177 static int notify_sock = -1;
178 
179 int mconsole_notify(char *sock_name, int type, const void *data, int len)
180 {
181         struct sockaddr_un target;
182         struct mconsole_notify packet;
183         int n, err = 0;
184 
185         lock_notify();
186         if (notify_sock < 0) {
187                 notify_sock = socket(PF_UNIX, SOCK_DGRAM, 0);
188                 if (notify_sock < 0) {
189                         err = -errno;
190                         printk(UM_KERN_ERR "mconsole_notify - socket failed, "
191                                "errno = %d\n", errno);
192                 }
193         }
194         unlock_notify();
195 
196         if (err)
197                 return err;
198 
199         target.sun_family = AF_UNIX;
200         strcpy(target.sun_path, sock_name);
201 
202         packet.magic = MCONSOLE_MAGIC;
203         packet.version = MCONSOLE_VERSION;
204         packet.type = type;
205         len = (len > sizeof(packet.data)) ? sizeof(packet.data) : len;
206         packet.len = len;
207         memcpy(packet.data, data, len);
208 
209         err = 0;
210         len = sizeof(packet) + packet.len - sizeof(packet.data);
211         n = sendto(notify_sock, &packet, len, 0, (struct sockaddr *) &target,
212                    sizeof(target));
213         if (n < 0) {
214                 err = -errno;
215                 printk(UM_KERN_ERR "mconsole_notify - sendto failed, "
216                        "errno = %d\n", errno);
217         }
218         return err;
219 }
220 

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