2005-04-16 18:20:36 -04:00
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/*
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* Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <stddef.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include "user.h"
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#include "user_util.h"
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#include "kern_util.h"
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#include "net_user.h"
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#include "os.h"
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int tap_open_common(void *dev, char *gate_addr)
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{
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int tap_addr[4];
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if(gate_addr == NULL) return(0);
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if(sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0],
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&tap_addr[1], &tap_addr[2], &tap_addr[3]) != 4){
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printk("Invalid tap IP address - '%s'\n", gate_addr);
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return(-EINVAL);
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}
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return(0);
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}
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2005-06-08 18:48:01 -04:00
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void tap_check_ips(char *gate_addr, unsigned char *eth_addr)
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2005-04-16 18:20:36 -04:00
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{
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int tap_addr[4];
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if((gate_addr != NULL) &&
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(sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0],
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&tap_addr[1], &tap_addr[2], &tap_addr[3]) == 4) &&
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(eth_addr[0] == tap_addr[0]) &&
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(eth_addr[1] == tap_addr[1]) &&
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(eth_addr[2] == tap_addr[2]) &&
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(eth_addr[3] == tap_addr[3])){
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printk("The tap IP address and the UML eth IP address"
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" must be different\n");
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}
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}
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2006-02-24 16:03:57 -05:00
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/* Do reliable error handling as this fails frequently enough. */
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2005-04-16 18:20:36 -04:00
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void read_output(int fd, char *output, int len)
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{
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2006-02-24 16:03:57 -05:00
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int remain, ret, expected;
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2005-04-16 18:20:36 -04:00
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char c;
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2006-02-24 16:03:57 -05:00
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char *str;
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2005-04-16 18:20:36 -04:00
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if(output == NULL){
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output = &c;
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len = sizeof(c);
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}
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*output = '\0';
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2006-02-24 16:03:57 -05:00
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ret = os_read_file(fd, &remain, sizeof(remain));
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if (ret != sizeof(remain)) {
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expected = sizeof(remain);
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str = "length";
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goto err;
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2005-04-16 18:20:36 -04:00
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}
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while(remain != 0){
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2006-02-24 16:03:57 -05:00
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expected = (remain < len) ? remain : len;
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ret = os_read_file(fd, output, expected);
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if (ret != expected) {
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str = "data";
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goto err;
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2005-04-16 18:20:36 -04:00
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}
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2006-02-24 16:03:57 -05:00
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remain -= ret;
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2005-04-16 18:20:36 -04:00
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}
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2006-02-24 16:03:57 -05:00
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2005-04-16 18:20:36 -04:00
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return;
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2006-02-24 16:03:57 -05:00
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err:
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if (ret < 0)
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printk("read_output - read of %s failed, errno = %d\n", str, -ret);
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else
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printk("read_output - read of %s failed, read only %d of %d bytes\n", str, ret, expected);
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2005-04-16 18:20:36 -04:00
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}
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int net_read(int fd, void *buf, int len)
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{
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int n;
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n = os_read_file(fd, buf, len);
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if(n == -EAGAIN)
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return(0);
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else if(n == 0)
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return(-ENOTCONN);
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return(n);
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}
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int net_recvfrom(int fd, void *buf, int len)
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{
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int n;
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while(((n = recvfrom(fd, buf, len, 0, NULL, NULL)) < 0) &&
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(errno == EINTR)) ;
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if(n < 0){
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if(errno == EAGAIN) return(0);
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return(-errno);
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}
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else if(n == 0) return(-ENOTCONN);
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return(n);
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}
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int net_write(int fd, void *buf, int len)
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{
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int n;
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n = os_write_file(fd, buf, len);
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if(n == -EAGAIN)
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return(0);
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else if(n == 0)
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return(-ENOTCONN);
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return(n);
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}
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int net_send(int fd, void *buf, int len)
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{
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int n;
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while(((n = send(fd, buf, len, 0)) < 0) && (errno == EINTR)) ;
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if(n < 0){
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if(errno == EAGAIN) return(0);
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return(-errno);
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}
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else if(n == 0) return(-ENOTCONN);
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return(n);
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}
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int net_sendto(int fd, void *buf, int len, void *to, int sock_len)
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{
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int n;
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while(((n = sendto(fd, buf, len, 0, (struct sockaddr *) to,
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sock_len)) < 0) && (errno == EINTR)) ;
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if(n < 0){
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if(errno == EAGAIN) return(0);
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return(-errno);
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}
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else if(n == 0) return(-ENOTCONN);
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return(n);
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}
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struct change_pre_exec_data {
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int close_me;
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int stdout;
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};
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static void change_pre_exec(void *arg)
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{
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struct change_pre_exec_data *data = arg;
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os_close_file(data->close_me);
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dup2(data->stdout, 1);
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}
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static int change_tramp(char **argv, char *output, int output_len)
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{
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int pid, fds[2], err;
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struct change_pre_exec_data pe_data;
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err = os_pipe(fds, 1, 0);
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if(err < 0){
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printk("change_tramp - pipe failed, err = %d\n", -err);
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return(err);
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}
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pe_data.close_me = fds[0];
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pe_data.stdout = fds[1];
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pid = run_helper(change_pre_exec, &pe_data, argv, NULL);
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read_output(fds[0], output, output_len);
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os_close_file(fds[0]);
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os_close_file(fds[1]);
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if (pid > 0)
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CATCH_EINTR(err = waitpid(pid, NULL, 0));
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return(pid);
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}
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static void change(char *dev, char *what, unsigned char *addr,
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unsigned char *netmask)
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{
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char addr_buf[sizeof("255.255.255.255\0")];
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char netmask_buf[sizeof("255.255.255.255\0")];
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char version[sizeof("nnnnn\0")];
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char *argv[] = { "uml_net", version, what, dev, addr_buf,
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netmask_buf, NULL };
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char *output;
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int output_len, pid;
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sprintf(version, "%d", UML_NET_VERSION);
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sprintf(addr_buf, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]);
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sprintf(netmask_buf, "%d.%d.%d.%d", netmask[0], netmask[1],
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netmask[2], netmask[3]);
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output_len = page_size();
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output = um_kmalloc(output_len);
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if(output == NULL)
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printk("change : failed to allocate output buffer\n");
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pid = change_tramp(argv, output, output_len);
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if(pid < 0) return;
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if(output != NULL){
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printk("%s", output);
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kfree(output);
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}
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}
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void open_addr(unsigned char *addr, unsigned char *netmask, void *arg)
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{
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change(arg, "add", addr, netmask);
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}
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void close_addr(unsigned char *addr, unsigned char *netmask, void *arg)
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{
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change(arg, "del", addr, netmask);
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}
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char *split_if_spec(char *str, ...)
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{
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char **arg, *end;
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va_list ap;
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va_start(ap, str);
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while((arg = va_arg(ap, char **)) != NULL){
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if(*str == '\0')
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return(NULL);
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end = strchr(str, ',');
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if(end != str)
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*arg = str;
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if(end == NULL)
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return(NULL);
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*end++ = '\0';
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str = end;
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}
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va_end(ap);
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return(str);
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}
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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