1 files changed, 215 insertions, 0 deletions

diff --git a/arch/um/drivers/mconsole_user.c b/arch/um/drivers/mconsole_user.c
new file mode 100644
index 000000000000..fe5afb13252c
--- /dev/null
+++ b/arch/um/drivers/mconsole_user.c
@@ -0,0 +1,215 @@
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org)
+ * Copyright (C) 2001 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <signal.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/uio.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include "user.h"
+#include "mconsole.h"
+#include "umid.h"
+
+static struct mconsole_command commands[] = {
+        { "version", mconsole_version, MCONSOLE_INTR },
+        { "halt", mconsole_halt, MCONSOLE_PROC },
+        { "reboot", mconsole_reboot, MCONSOLE_PROC },
+        { "config", mconsole_config, MCONSOLE_PROC },
+        { "remove", mconsole_remove, MCONSOLE_PROC },
+        { "sysrq", mconsole_sysrq, MCONSOLE_INTR },
+        { "help", mconsole_help, MCONSOLE_INTR },
+        { "cad", mconsole_cad, MCONSOLE_INTR },
+        { "stop", mconsole_stop, MCONSOLE_PROC },
+        { "go", mconsole_go, MCONSOLE_INTR },
+        { "log", mconsole_log, MCONSOLE_INTR },
+        { "proc", mconsole_proc, MCONSOLE_PROC },
+};
+
+/* Initialized in mconsole_init, which is an initcall */
+char mconsole_socket_name[256];
+
+int mconsole_reply_v0(struct mc_request *req, char *reply)
+{
+        struct iovec iov;
+        struct msghdr msg;
+
+        iov.iov_base = reply;
+        iov.iov_len = strlen(reply);
+
+        msg.msg_name = &(req->origin);
+        msg.msg_namelen = req->originlen;
+        msg.msg_iov = &iov;
+        msg.msg_iovlen = 1;
+        msg.msg_control = NULL;
+        msg.msg_controllen = 0;
+        msg.msg_flags = 0;
+
+        return sendmsg(req->originating_fd, &msg, 0);
+}
+
+static struct mconsole_command *mconsole_parse(struct mc_request *req)
+{
+        struct mconsole_command *cmd;
+        int i;
+
+        for(i=0;i<sizeof(commands)/sizeof(commands[0]);i++){
+                cmd = &commands[i];
+                if(!strncmp(req->request.data, cmd->command, 
+                            strlen(cmd->command))){
+                        return(cmd);
+                }
+        }
+        return(NULL);
+}
+
+#define MIN(a,b) ((a)<(b) ? (a):(b))
+
+#define STRINGX(x) #x
+#define STRING(x) STRINGX(x)
+
+int mconsole_get_request(int fd, struct mc_request *req)
+{
+        int len;
+
+        req->originlen = sizeof(req->origin);
+        req->len = recvfrom(fd, &req->request, sizeof(req->request), 0,
+                            (struct sockaddr *) req->origin, &req->originlen);
+        if (req->len < 0)
+                return 0;
+
+        req->originating_fd = fd;
+
+        if(req->request.magic != MCONSOLE_MAGIC){
+                /* Unversioned request */
+                len = MIN(sizeof(req->request.data) - 1, 
+                          strlen((char *) &req->request));
+                memmove(req->request.data, &req->request, len);
+                req->request.data[len] = '\0';
+
+                req->request.magic = MCONSOLE_MAGIC;
+                req->request.version = 0;
+                req->request.len = len;
+
+                mconsole_reply_v0(req, "ERR Version 0 mconsole clients are "
+                                  "not supported by this driver");
+                return(0);
+        }
+
+        if(req->request.len >= MCONSOLE_MAX_DATA){
+                mconsole_reply(req, "Request too large", 1, 0);
+                return(0);
+        }
+        if(req->request.version != MCONSOLE_VERSION){
+                mconsole_reply(req, "This driver only supports version " 
+                               STRING(MCONSOLE_VERSION) " clients", 1, 0);
+        }
+        
+        req->request.data[req->request.len] = '\0';
+        req->cmd = mconsole_parse(req);
+        if(req->cmd == NULL){
+                mconsole_reply(req, "Unknown command", 1, 0);
+                return(0);
+        }
+
+        return(1);
+}
+
+int mconsole_reply(struct mc_request *req, char *str, int err, int more)
+{
+        struct mconsole_reply reply;
+        int total, len, n;
+
+        total = strlen(str);
+        do {
+                reply.err = err;
+
+                /* err can only be true on the first packet */
+                err = 0;
+
+                len = MIN(total, MCONSOLE_MAX_DATA - 1);
+
+                if(len == total) reply.more = more;
+                else reply.more = 1;
+
+                memcpy(reply.data, str, len);
+                reply.data[len] = '\0';
+                total -= len;
+                str += len;
+                reply.len = len + 1;
+
+                len = sizeof(reply) + reply.len - sizeof(reply.data);
+
+                n = sendto(req->originating_fd, &reply, len, 0,
+                           (struct sockaddr *) req->origin, req->originlen);
+
+                if(n < 0) return(-errno);
+        } while(total > 0);
+        return(0);
+}
+
+int mconsole_unlink_socket(void)
+{
+        unlink(mconsole_socket_name);
+        return 0;
+}
+
+static int notify_sock = -1;
+
+int mconsole_notify(char *sock_name, int type, const void *data, int len)
+{
+        struct sockaddr_un target;
+        struct mconsole_notify packet;
+        int n, err = 0;
+
+        lock_notify();
+        if(notify_sock < 0){
+                notify_sock = socket(PF_UNIX, SOCK_DGRAM, 0);
+                if(notify_sock < 0){
+                        printk("mconsole_notify - socket failed, errno = %d\n",
+                               errno);
+                        err = -errno;
+                }
+        }
+        unlock_notify();
+        
+        if(err)
+                return(err);
+
+        target.sun_family = AF_UNIX;
+        strcpy(target.sun_path, sock_name);
+
+        packet.magic = MCONSOLE_MAGIC;
+        packet.version = MCONSOLE_VERSION;
+        packet.type = type;
+        len = (len > sizeof(packet.data)) ? sizeof(packet.data) : len;
+        packet.len = len;
+        memcpy(packet.data, data, len);
+
+        err = 0;
+        len = sizeof(packet) + packet.len - sizeof(packet.data);
+        n = sendto(notify_sock, &packet, len, 0, (struct sockaddr *) &target, 
+                   sizeof(target));
+        if(n < 0){
+                printk("mconsole_notify - sendto failed, errno = %d\n", errno);
+                err = -errno;
+        }
+        return(err);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */