diff options
Diffstat (limited to 'arch/um/drivers/mconsole_user.c')
| -rw-r--r-- | arch/um/drivers/mconsole_user.c | 215 |
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: + */ |