128 строки
2.2 KiB
C
128 строки
2.2 KiB
C
/*
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* Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL.
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*/
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/wait.h>
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#include "kern_constants.h"
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#include "net_user.h"
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#include "os.h"
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#include "slirp.h"
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#include "user.h"
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static int slirp_user_init(void *data, void *dev)
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{
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struct slirp_data *pri = data;
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pri->dev = dev;
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return 0;
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}
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struct slirp_pre_exec_data {
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int stdin;
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int stdout;
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};
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static void slirp_pre_exec(void *arg)
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{
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struct slirp_pre_exec_data *data = arg;
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if (data->stdin != -1)
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dup2(data->stdin, 0);
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if (data->stdout != -1)
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dup2(data->stdout, 1);
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}
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static int slirp_tramp(char **argv, int fd)
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{
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struct slirp_pre_exec_data pe_data;
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int pid;
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pe_data.stdin = fd;
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pe_data.stdout = fd;
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pid = run_helper(slirp_pre_exec, &pe_data, argv);
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return pid;
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}
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static int slirp_open(void *data)
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{
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struct slirp_data *pri = data;
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int fds[2], pid, err;
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err = os_pipe(fds, 1, 1);
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if (err)
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return err;
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err = slirp_tramp(pri->argw.argv, fds[1]);
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if (err < 0) {
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printk(UM_KERN_ERR "slirp_tramp failed - errno = %d\n", -err);
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goto out;
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}
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pid = err;
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pri->slave = fds[1];
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pri->slip.pos = 0;
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pri->slip.esc = 0;
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pri->pid = err;
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return fds[0];
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out:
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close(fds[0]);
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close(fds[1]);
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return err;
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}
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static void slirp_close(int fd, void *data)
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{
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struct slirp_data *pri = data;
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int err;
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close(fd);
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close(pri->slave);
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pri->slave = -1;
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if (pri->pid<1) {
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printk(UM_KERN_ERR "slirp_close: no child process to shut "
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"down\n");
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return;
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}
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#if 0
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if (kill(pri->pid, SIGHUP)<0) {
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printk(UM_KERN_ERR "slirp_close: sending hangup to %d failed "
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"(%d)\n", pri->pid, errno);
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}
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#endif
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err = helper_wait(pri->pid);
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if (err < 0)
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return;
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pri->pid = -1;
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}
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int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri)
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{
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return slip_proto_read(fd, buf, len, &pri->slip);
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}
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int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri)
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{
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return slip_proto_write(fd, buf, len, &pri->slip);
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}
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const struct net_user_info slirp_user_info = {
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.init = slirp_user_init,
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.open = slirp_open,
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.close = slirp_close,
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.remove = NULL,
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.add_address = NULL,
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.delete_address = NULL,
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.mtu = BUF_SIZE,
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.max_packet = BUF_SIZE,
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};
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