1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <unistd.h> 4 #include <stddef.h> 5 #include <sched.h> 6 #include <string.h> 7 #include <errno.h> 8 #include <sys/termios.h> 9 #include <sys/wait.h> 10 #include <sys/signal.h> 11 #include "user_util.h" 12 #include "kern_util.h" 13 #include "user.h" 14 #include "net_user.h" 15 #include "slip.h" 16 #include "slip_common.h" 17 #include "os.h" 18 19 void slip_user_init(void *data, void *dev) 20 { 21 struct slip_data *pri = data; 22 23 pri->dev = dev; 24 } 25 26 static int set_up_tty(int fd) 27 { 28 int i; 29 struct termios tios; 30 31 if (tcgetattr(fd, &tios) < 0) { 32 printk("could not get initial terminal attributes\n"); 33 return(-1); 34 } 35 36 tios.c_cflag = CS8 | CREAD | HUPCL | CLOCAL; 37 tios.c_iflag = IGNBRK | IGNPAR; 38 tios.c_oflag = 0; 39 tios.c_lflag = 0; 40 for (i = 0; i < NCCS; i++) 41 tios.c_cc[i] = 0; 42 tios.c_cc[VMIN] = 1; 43 tios.c_cc[VTIME] = 0; 44 45 cfsetospeed(&tios, B38400); 46 cfsetispeed(&tios, B38400); 47 48 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) { 49 printk("failed to set terminal attributes\n"); 50 return(-1); 51 } 52 return(0); 53 } 54 55 struct slip_pre_exec_data { 56 int stdin; 57 int stdout; 58 int close_me; 59 }; 60 61 static void slip_pre_exec(void *arg) 62 { 63 struct slip_pre_exec_data *data = arg; 64 65 if(data->stdin >= 0) dup2(data->stdin, 0); 66 dup2(data->stdout, 1); 67 if(data->close_me >= 0) os_close_file(data->close_me); 68 } 69 70 static int slip_tramp(char **argv, int fd) 71 { 72 struct slip_pre_exec_data pe_data; 73 char *output; 74 int status, pid, fds[2], err, output_len; 75 76 err = os_pipe(fds, 1, 0); 77 if(err < 0){ 78 printk("slip_tramp : pipe failed, err = %d\n", -err); 79 goto out; 80 } 81 82 err = 0; 83 pe_data.stdin = fd; 84 pe_data.stdout = fds[1]; 85 pe_data.close_me = fds[0]; 86 err = run_helper(slip_pre_exec, &pe_data, argv, NULL); 87 if(err < 0) 88 goto out_close; 89 pid = err; 90 91 output_len = page_size(); 92 output = um_kmalloc(output_len); 93 if(output == NULL){ 94 printk("slip_tramp : failed to allocate output buffer\n"); 95 os_kill_process(pid, 1); 96 err = -ENOMEM; 97 goto out_free; 98 } 99 100 os_close_file(fds[1]); 101 read_output(fds[0], output, output_len); 102 printk("%s", output); 103 104 CATCH_EINTR(err = waitpid(pid, &status, 0)); 105 if(err < 0) 106 err = errno; 107 else if(!WIFEXITED(status) || (WEXITSTATUS(status) != 0)){ 108 printk("'%s' didn't exit with status 0\n", argv[0]); 109 err = -EINVAL; 110 } 111 else err = 0; 112 113 os_close_file(fds[0]); 114 115 out_free: 116 kfree(output); 117 return err; 118 119 out_close: 120 os_close_file(fds[0]); 121 os_close_file(fds[1]); 122 out: 123 return err; 124 } 125 126 static int slip_open(void *data) 127 { 128 struct slip_data *pri = data; 129 char version_buf[sizeof("nnnnn\0")]; 130 char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")]; 131 char *argv[] = { "uml_net", version_buf, "slip", "up", gate_buf, 132 NULL }; 133 int sfd, mfd, err; 134 135 err = get_pty(); 136 if(err < 0){ 137 printk("slip-open : Failed to open pty, err = %d\n", -err); 138 goto out; 139 } 140 mfd = err; 141 142 err = os_open_file(ptsname(mfd), of_rdwr(OPENFLAGS()), 0); 143 if(err < 0){ 144 printk("Couldn't open tty for slip line, err = %d\n", -err); 145 goto out_close; 146 } 147 sfd = err; 148 149 if(set_up_tty(sfd)) 150 goto out_close2; 151 152 pri->slave = sfd; 153 pri->slip.pos = 0; 154 pri->slip.esc = 0; 155 if(pri->gate_addr != NULL){ 156 sprintf(version_buf, "%d", UML_NET_VERSION); 157 strcpy(gate_buf, pri->gate_addr); 158 159 err = slip_tramp(argv, sfd); 160 161 if(err < 0){ 162 printk("slip_tramp failed - err = %d\n", -err); 163 goto out_close2; 164 } 165 err = os_get_ifname(pri->slave, pri->name); 166 if(err < 0){ 167 printk("get_ifname failed, err = %d\n", -err); 168 goto out_close2; 169 } 170 iter_addresses(pri->dev, open_addr, pri->name); 171 } 172 else { 173 err = os_set_slip(sfd); 174 if(err < 0){ 175 printk("Failed to set slip discipline encapsulation - " 176 "err = %d\n", -err); 177 goto out_close2; 178 } 179 } 180 return(mfd); 181 out_close2: 182 os_close_file(sfd); 183 out_close: 184 os_close_file(mfd); 185 out: 186 return err; 187 } 188 189 static void slip_close(int fd, void *data) 190 { 191 struct slip_data *pri = data; 192 char version_buf[sizeof("nnnnn\0")]; 193 char *argv[] = { "uml_net", version_buf, "slip", "down", pri->name, 194 NULL }; 195 int err; 196 197 if(pri->gate_addr != NULL) 198 iter_addresses(pri->dev, close_addr, pri->name); 199 200 sprintf(version_buf, "%d", UML_NET_VERSION); 201 202 err = slip_tramp(argv, pri->slave); 203 204 if(err != 0) 205 printk("slip_tramp failed - errno = %d\n", -err); 206 os_close_file(fd); 207 os_close_file(pri->slave); 208 pri->slave = -1; 209 } 210 211 int slip_user_read(int fd, void *buf, int len, struct slip_data *pri) 212 { 213 return slip_proto_read(fd, buf, len, &pri->slip); 214 } 215 216 int slip_user_write(int fd, void *buf, int len, struct slip_data *pri) 217 { 218 return slip_proto_write(fd, buf, len, &pri->slip); 219 } 220 221 static int slip_set_mtu(int mtu, void *data) 222 { 223 return(mtu); 224 } 225 226 static void slip_add_addr(unsigned char *addr, unsigned char *netmask, 227 void *data) 228 { 229 struct slip_data *pri = data; 230 231 if(pri->slave < 0) return; 232 open_addr(addr, netmask, pri->name); 233 } 234 235 static void slip_del_addr(unsigned char *addr, unsigned char *netmask, 236 void *data) 237 { 238 struct slip_data *pri = data; 239 240 if(pri->slave < 0) return; 241 close_addr(addr, netmask, pri->name); 242 } 243 244 struct net_user_info slip_user_info = { 245 .init = slip_user_init, 246 .open = slip_open, 247 .close = slip_close, 248 .remove = NULL, 249 .set_mtu = slip_set_mtu, 250 .add_address = slip_add_addr, 251 .delete_address = slip_del_addr, 252 .max_packet = BUF_SIZE 253 }; 254