diff options
Diffstat (limited to 'arch/um/drivers/port_user.c')
| -rw-r--r-- | arch/um/drivers/port_user.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/arch/um/drivers/port_user.c b/arch/um/drivers/port_user.c new file mode 100644 index 000000000..3c62ae81d --- /dev/null +++ b/arch/um/drivers/port_user.c @@ -0,0 +1,217 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com) + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include <termios.h> +#include <unistd.h> +#include <netinet/in.h> +#include "chan_user.h" +#include <os.h> +#include "port.h" +#include <um_malloc.h> + +struct port_chan { + int raw; + struct termios tt; + void *kernel_data; + char dev[sizeof("32768\0")]; +}; + +static void *port_init(char *str, int device, const struct chan_opts *opts) +{ + struct port_chan *data; + void *kern_data; + char *end; + int port; + + if (*str != ':') { + printk(UM_KERN_ERR "port_init : channel type 'port' must " + "specify a port number\n"); + return NULL; + } + str++; + port = strtoul(str, &end, 0); + if ((*end != '\0') || (end == str)) { + printk(UM_KERN_ERR "port_init : couldn't parse port '%s'\n", + str); + return NULL; + } + + kern_data = port_data(port); + if (kern_data == NULL) + return NULL; + + data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL); + if (data == NULL) + goto err; + + *data = ((struct port_chan) { .raw = opts->raw, + .kernel_data = kern_data }); + sprintf(data->dev, "%d", port); + + return data; + err: + port_kern_free(kern_data); + return NULL; +} + +static void port_free(void *d) +{ + struct port_chan *data = d; + + port_kern_free(data->kernel_data); + kfree(data); +} + +static int port_open(int input, int output, int primary, void *d, + char **dev_out) +{ + struct port_chan *data = d; + int fd, err; + + fd = port_wait(data->kernel_data); + if ((fd >= 0) && data->raw) { + CATCH_EINTR(err = tcgetattr(fd, &data->tt)); + if (err) + return err; + + err = raw(fd); + if (err) + return err; + } + *dev_out = data->dev; + return fd; +} + +static void port_close(int fd, void *d) +{ + struct port_chan *data = d; + + port_remove_dev(data->kernel_data); + os_close_file(fd); +} + +const struct chan_ops port_ops = { + .type = "port", + .init = port_init, + .open = port_open, + .close = port_close, + .read = generic_read, + .write = generic_write, + .console_write = generic_console_write, + .window_size = generic_window_size, + .free = port_free, + .winch = 1, +}; + +int port_listen_fd(int port) +{ + struct sockaddr_in addr; + int fd, err, arg; + + fd = socket(PF_INET, SOCK_STREAM, 0); + if (fd == -1) + return -errno; + + arg = 1; + if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &arg, sizeof(arg)) < 0) { + err = -errno; + goto out; + } + + addr.sin_family = AF_INET; + addr.sin_port = htons(port); + addr.sin_addr.s_addr = htonl(INADDR_ANY); + if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { + err = -errno; + goto out; + } + + if (listen(fd, 1) < 0) { + err = -errno; + goto out; + } + + err = os_set_fd_block(fd, 0); + if (err < 0) + goto out; + + return fd; + out: + close(fd); + return err; +} + +struct port_pre_exec_data { + int sock_fd; + int pipe_fd; +}; + +static void port_pre_exec(void *arg) +{ + struct port_pre_exec_data *data = arg; + + dup2(data->sock_fd, 0); + dup2(data->sock_fd, 1); + dup2(data->sock_fd, 2); + close(data->sock_fd); + dup2(data->pipe_fd, 3); + shutdown(3, SHUT_RD); + close(data->pipe_fd); +} + +int port_connection(int fd, int *socket, int *pid_out) +{ + int new, err; + char *env; + char *argv[] = { "in.telnetd", "-L", + OS_LIB_PATH "/uml/port-helper", NULL }; + struct port_pre_exec_data data; + + if ((env = getenv("UML_PORT_HELPER"))) + argv[2] = env; + + new = accept(fd, NULL, 0); + if (new < 0) + return -errno; + + err = os_access(argv[2], X_OK); + if (err < 0) { + printk(UM_KERN_ERR "port_connection : error accessing port-helper " + "executable at %s: %s\n", argv[2], strerror(-err)); + if (env == NULL) + printk(UM_KERN_ERR "Set UML_PORT_HELPER environment " + "variable to path to uml-utilities port-helper " + "binary\n"); + goto out_close; + } + + err = os_pipe(socket, 0, 0); + if (err < 0) + goto out_close; + + data = ((struct port_pre_exec_data) + { .sock_fd = new, + .pipe_fd = socket[1] }); + + err = run_helper(port_pre_exec, &data, argv); + if (err < 0) + goto out_shutdown; + + *pid_out = err; + return new; + + out_shutdown: + shutdown(socket[0], SHUT_RDWR); + close(socket[0]); + shutdown(socket[1], SHUT_RDWR); + close(socket[1]); + out_close: + close(new); + return err; +} |