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160
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1 /* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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2 *
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3 * Permission is hereby granted, free of charge, to any person obtaining a copy
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4 * of this software and associated documentation files (the "Software"), to
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5 * deal in the Software without restriction, including without limitation the
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6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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7 * sell copies of the Software, and to permit persons to whom the Software is
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8 * furnished to do so, subject to the following conditions:
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9 *
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10 * The above copyright notice and this permission notice shall be included in
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11 * all copies or substantial portions of the Software.
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12 *
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13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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19 * IN THE SOFTWARE.
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20 */
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21
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22 #include "uv.h"
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23 #include "internal.h"
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24
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25 #include <stdatomic.h>
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26 #include <stdlib.h>
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27 #include <assert.h>
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28 #include <unistd.h>
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29 #include <termios.h>
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30 #include <errno.h>
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31 #include <sys/ioctl.h>
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32
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33 #if defined(__MVS__) && !defined(IMAXBEL)
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34 #define IMAXBEL 0
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35 #endif
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36
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37 #if defined(__PASE__)
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38 /* On IBM i PASE, for better compatibility with running interactive programs in
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39 * a 5250 environment, isatty() will return true for the stdin/stdout/stderr
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40 * streams created by QSH/QP2TERM.
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41 *
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42 * For more, see docs on PASE_STDIO_ISATTY in
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43 * https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_74/apis/pase_environ.htm
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44 *
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45 * This behavior causes problems for Node as it expects that if isatty() returns
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46 * true that TTY ioctls will be supported by that fd (which is not an
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47 * unreasonable expectation) and when they don't it crashes with assertion
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48 * errors.
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49 *
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50 * Here, we create our own version of isatty() that uses ioctl() to identify
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51 * whether the fd is *really* a TTY or not.
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52 */
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53 static int isreallyatty(int file) {
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54 int rc;
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55
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56 rc = !ioctl(file, TXISATTY + 0x81, NULL);
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57 if (!rc && errno != EBADF)
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58 errno = ENOTTY;
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59
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60 return rc;
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61 }
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62 #define isatty(fd) isreallyatty(fd)
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63 #endif
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64
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65 static int orig_termios_fd = -1;
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66 static struct termios orig_termios;
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67 static _Atomic int termios_spinlock;
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68
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69 int uv__tcsetattr(int fd, int how, const struct termios *term) {
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70 int rc;
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71
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72 do
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73 rc = tcsetattr(fd, how, term);
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74 while (rc == -1 && errno == EINTR);
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75
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76 if (rc == -1)
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77 return UV__ERR(errno);
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78
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79 return 0;
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80 }
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81
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82 static int uv__tty_is_slave(const int fd) {
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83 int result;
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84 #if defined(__linux__) || defined(__FreeBSD__)
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85 int dummy;
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86
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87 result = ioctl(fd, TIOCGPTN, &dummy) != 0;
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88 #elif defined(__APPLE__)
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89 char dummy[256];
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90
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91 result = ioctl(fd, TIOCPTYGNAME, &dummy) != 0;
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92 #elif defined(__NetBSD__)
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93 /*
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94 * NetBSD as an extension returns with ptsname(3) and ptsname_r(3) the slave
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95 * device name for both descriptors, the master one and slave one.
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96 *
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97 * Implement function to compare major device number with pts devices.
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98 *
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99 * The major numbers are machine-dependent, on NetBSD/amd64 they are
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100 * respectively:
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101 * - master tty: ptc - major 6
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102 * - slave tty: pts - major 5
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103 */
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104
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105 struct stat sb;
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106 /* Lookup device's major for the pts driver and cache it. */
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107 static devmajor_t pts = NODEVMAJOR;
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108
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109 if (pts == NODEVMAJOR) {
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110 pts = getdevmajor("pts", S_IFCHR);
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111 if (pts == NODEVMAJOR)
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112 abort();
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113 }
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114
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115 /* Lookup stat structure behind the file descriptor. */
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116 if (uv__fstat(fd, &sb) != 0)
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117 abort();
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118
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119 /* Assert character device. */
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120 if (!S_ISCHR(sb.st_mode))
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121 abort();
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122
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123 /* Assert valid major. */
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124 if (major(sb.st_rdev) == NODEVMAJOR)
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125 abort();
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126
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127 result = (pts == major(sb.st_rdev));
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128 #else
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129 /* Fallback to ptsname
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130 */
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131 result = ptsname(fd) == NULL;
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132 #endif
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133 return result;
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134 }
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135
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136 int uv_tty_init(uv_loop_t* loop, uv_tty_t* tty, int fd, int unused) {
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137 uv_handle_type type;
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138 int flags;
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139 int newfd;
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140 int r;
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141 int saved_flags;
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142 int mode;
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143 char path[256];
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144 (void)unused; /* deprecated parameter is no longer needed */
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145
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146 /* File descriptors that refer to files cannot be monitored with epoll.
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147 * That restriction also applies to character devices like /dev/random
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148 * (but obviously not /dev/tty.)
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149 */
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150 type = uv_guess_handle(fd);
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151 if (type == UV_FILE || type == UV_UNKNOWN_HANDLE)
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152 return UV_EINVAL;
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153
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154 flags = 0;
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155 newfd = -1;
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156
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157 /* Save the fd flags in case we need to restore them due to an error. */
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158 do
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159 saved_flags = fcntl(fd, F_GETFL);
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160 while (saved_flags == -1 && errno == EINTR);
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161
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162 if (saved_flags == -1)
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163 return UV__ERR(errno);
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164 mode = saved_flags & O_ACCMODE;
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165
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166 /* Reopen the file descriptor when it refers to a tty. This lets us put the
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167 * tty in non-blocking mode without affecting other processes that share it
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168 * with us.
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169 *
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170 * Example: `node | cat` - if we put our fd 0 in non-blocking mode, it also
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171 * affects fd 1 of `cat` because both file descriptors refer to the same
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172 * struct file in the kernel. When we reopen our fd 0, it points to a
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173 * different struct file, hence changing its properties doesn't affect
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174 * other processes.
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175 */
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176 if (type == UV_TTY) {
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177 /* Reopening a pty in master mode won't work either because the reopened
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178 * pty will be in slave mode (*BSD) or reopening will allocate a new
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179 * master/slave pair (Linux). Therefore check if the fd points to a
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180 * slave device.
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181 */
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182 if (uv__tty_is_slave(fd) && ttyname_r(fd, path, sizeof(path)) == 0)
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183 r = uv__open_cloexec(path, mode | O_NOCTTY);
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184 else
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185 r = -1;
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186
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187 if (r < 0) {
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188 /* fallback to using blocking writes */
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189 if (mode != O_RDONLY)
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190 flags |= UV_HANDLE_BLOCKING_WRITES;
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191 goto skip;
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192 }
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193
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194 newfd = r;
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195
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196 r = uv__dup2_cloexec(newfd, fd);
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197 if (r < 0 && r != UV_EINVAL) {
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198 /* EINVAL means newfd == fd which could conceivably happen if another
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199 * thread called close(fd) between our calls to isatty() and open().
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200 * That's a rather unlikely event but let's handle it anyway.
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201 */
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202 uv__close(newfd);
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203 return r;
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204 }
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205
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206 fd = newfd;
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207 }
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208
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209 skip:
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210 uv__stream_init(loop, (uv_stream_t*) tty, UV_TTY);
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211
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212 /* If anything fails beyond this point we need to remove the handle from
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213 * the handle queue, since it was added by uv__handle_init in uv_stream_init.
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214 */
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215
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216 if (!(flags & UV_HANDLE_BLOCKING_WRITES))
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217 uv__nonblock(fd, 1);
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218
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219 #if defined(__APPLE__)
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220 r = uv__stream_try_select((uv_stream_t*) tty, &fd);
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221 if (r) {
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222 int rc = r;
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223 if (newfd != -1)
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224 uv__close(newfd);
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225 uv__queue_remove(&tty->handle_queue);
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226 do
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227 r = fcntl(fd, F_SETFL, saved_flags);
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228 while (r == -1 && errno == EINTR);
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229 return rc;
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230 }
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231 #endif
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232
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233 if (mode != O_WRONLY)
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234 flags |= UV_HANDLE_READABLE;
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235 if (mode != O_RDONLY)
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236 flags |= UV_HANDLE_WRITABLE;
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237
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238 uv__stream_open((uv_stream_t*) tty, fd, flags);
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239 tty->mode = UV_TTY_MODE_NORMAL;
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240
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241 return 0;
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242 }
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243
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244 static void uv__tty_make_raw(struct termios* tio) {
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245 assert(tio != NULL);
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246
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247 #if defined __sun || defined __MVS__
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248 /*
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249 * This implementation of cfmakeraw for Solaris and derivatives is taken from
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250 * http://www.perkin.org.uk/posts/solaris-portability-cfmakeraw.html.
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251 */
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252 tio->c_iflag &= ~(IMAXBEL | IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR |
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253 IGNCR | ICRNL | IXON);
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254 tio->c_oflag &= ~OPOST;
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255 tio->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
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256 tio->c_cflag &= ~(CSIZE | PARENB);
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257 tio->c_cflag |= CS8;
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258
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259 /*
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260 * By default, most software expects a pending read to block until at
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261 * least one byte becomes available. As per termio(7I), this requires
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262 * setting the MIN and TIME parameters appropriately.
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263 *
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264 * As a somewhat unfortunate artifact of history, the MIN and TIME slots
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265 * in the control character array overlap with the EOF and EOL slots used
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266 * for canonical mode processing. Because the EOF character needs to be
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267 * the ASCII EOT value (aka Control-D), it has the byte value 4. When
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268 * switching to raw mode, this is interpreted as a MIN value of 4; i.e.,
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269 * reads will block until at least four bytes have been input.
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270 *
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271 * Other platforms with a distinct MIN slot like Linux and FreeBSD appear
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272 * to default to a MIN value of 1, so we'll force that value here:
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273 */
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274 tio->c_cc[VMIN] = 1;
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275 tio->c_cc[VTIME] = 0;
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276 #else
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277 cfmakeraw(tio);
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278 #endif /* #ifdef __sun */
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279 }
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280
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281 int uv_tty_set_mode(uv_tty_t* tty, uv_tty_mode_t mode) {
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282 struct termios tmp;
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283 int expected;
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284 int fd;
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285 int rc;
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286
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287 if (uv__is_raw_tty_mode(mode)) {
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288 /* There is only a single raw TTY mode on UNIX. */
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289 mode = UV_TTY_MODE_RAW;
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290 }
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291
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292 if (tty->mode == (int) mode)
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293 return 0;
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294
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295 fd = uv__stream_fd(tty);
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296 if (tty->mode == UV_TTY_MODE_NORMAL && mode != UV_TTY_MODE_NORMAL) {
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297 do
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298 rc = tcgetattr(fd, &tty->orig_termios);
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299 while (rc == -1 && errno == EINTR);
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300
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301 if (rc == -1)
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302 return UV__ERR(errno);
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303
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304 /* This is used for uv_tty_reset_mode() */
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305 do
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306 expected = 0;
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307 while (!atomic_compare_exchange_strong(&termios_spinlock, &expected, 1));
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308
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309 if (orig_termios_fd == -1) {
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310 orig_termios = tty->orig_termios;
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311 orig_termios_fd = fd;
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312 }
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313
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314 atomic_store(&termios_spinlock, 0);
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315 }
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316
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317 tmp = tty->orig_termios;
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318 switch (mode) {
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319 case UV_TTY_MODE_NORMAL:
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320 break;
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321 case UV_TTY_MODE_RAW:
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322 tmp.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
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323 tmp.c_oflag |= (ONLCR);
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324 tmp.c_cflag |= (CS8);
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325 tmp.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
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326 tmp.c_cc[VMIN] = 1;
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327 tmp.c_cc[VTIME] = 0;
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328 break;
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329 case UV_TTY_MODE_IO:
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330 uv__tty_make_raw(&tmp);
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331 break;
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332 default:
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333 UNREACHABLE();
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334 }
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335
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336 /* Apply changes after draining */
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337 rc = uv__tcsetattr(fd, TCSADRAIN, &tmp);
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338 if (rc == 0)
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339 tty->mode = mode;
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340
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341 return rc;
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342 }
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343
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344
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345 void uv__tty_close(uv_tty_t* handle) {
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346 int expected;
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347 int fd;
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348
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349 fd = handle->io_watcher.fd;
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350 if (fd == -1)
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351 goto done;
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352
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353 /* This is used for uv_tty_reset_mode() */
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354 do
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355 expected = 0;
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356 while (!atomic_compare_exchange_strong(&termios_spinlock, &expected, 1));
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357
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358 if (fd == orig_termios_fd) {
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359 /* XXX(bnoordhuis) the tcsetattr is probably wrong when there are still
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360 * other uv_tty_t handles active that refer to the same tty/pty but it's
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361 * hard to recognize that particular situation without maintaining some
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362 * kind of process-global data structure, and that still won't work in a
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363 * multi-process setup.
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364 */
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365 uv__tcsetattr(fd, TCSANOW, &orig_termios);
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366 orig_termios_fd = -1;
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367 }
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368
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369 atomic_store(&termios_spinlock, 0);
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370
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371 done:
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372 uv__stream_close((uv_stream_t*) handle);
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373 }
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374
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375
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376 int uv_tty_get_winsize(uv_tty_t* tty, int* width, int* height) {
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377 struct winsize ws;
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378 int err;
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379
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380 do
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381 err = ioctl(uv__stream_fd(tty), TIOCGWINSZ, &ws);
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382 while (err == -1 && errno == EINTR);
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383
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384 if (err == -1)
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385 return UV__ERR(errno);
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386
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387 *width = ws.ws_col;
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388 *height = ws.ws_row;
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389
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390 return 0;
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391 }
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392
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393
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394 uv_handle_type uv_guess_handle(uv_file file) {
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395 struct sockaddr_storage ss;
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396 struct stat s;
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397 socklen_t len;
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398 int type;
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399
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400 if (file < 0)
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401 return UV_UNKNOWN_HANDLE;
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402
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403 if (isatty(file))
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404 return UV_TTY;
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405
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406 if (uv__fstat(file, &s)) {
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407 #if defined(__PASE__)
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408 /* On ibmi receiving RST from TCP instead of FIN immediately puts fd into
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409 * an error state. fstat will return EINVAL, getsockname will also return
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410 * EINVAL, even if sockaddr_storage is valid. (If file does not refer to a
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411 * socket, ENOTSOCK is returned instead.)
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412 * In such cases, we will permit the user to open the connection as uv_tcp
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413 * still, so that the user can get immediately notified of the error in
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414 * their read callback and close this fd.
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415 */
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416 len = sizeof(ss);
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417 if (getsockname(file, (struct sockaddr*) &ss, &len)) {
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418 if (errno == EINVAL)
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419 return UV_TCP;
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420 }
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421 #endif
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422 return UV_UNKNOWN_HANDLE;
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423 }
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424
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425 if (S_ISREG(s.st_mode))
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426 return UV_FILE;
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427
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428 if (S_ISCHR(s.st_mode))
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429 return UV_FILE; /* XXX UV_NAMED_PIPE? */
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430
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431 if (S_ISFIFO(s.st_mode))
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432 return UV_NAMED_PIPE;
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433
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434 if (!S_ISSOCK(s.st_mode))
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435 return UV_UNKNOWN_HANDLE;
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436
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437 len = sizeof(ss);
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438 if (getsockname(file, (struct sockaddr*) &ss, &len)) {
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439 #if defined(_AIX)
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440 /* On aix receiving RST from TCP instead of FIN immediately puts fd into
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441 * an error state. In such case getsockname will return EINVAL, even if
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442 * sockaddr_storage is valid.
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443 * In such cases, we will permit the user to open the connection as uv_tcp
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444 * still, so that the user can get immediately notified of the error in
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445 * their read callback and close this fd.
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446 */
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447 if (errno == EINVAL) {
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448 return UV_TCP;
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449 }
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450 #endif
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451 return UV_UNKNOWN_HANDLE;
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452 }
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453
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454 len = sizeof(type);
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455 if (getsockopt(file, SOL_SOCKET, SO_TYPE, &type, &len))
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456 return UV_UNKNOWN_HANDLE;
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457
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458 if (type == SOCK_DGRAM)
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|
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459 if (ss.ss_family == AF_INET || ss.ss_family == AF_INET6)
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460 return UV_UDP;
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461
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462 if (type == SOCK_STREAM) {
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463 #if defined(_AIX) || defined(__DragonFly__)
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464 /* on AIX/DragonFly the getsockname call returns an empty sa structure
|
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465 * for sockets of type AF_UNIX. For all other types it will
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466 * return a properly filled in structure.
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|
|
467 */
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|
|
468 if (len == 0)
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|
|
469 return UV_NAMED_PIPE;
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|
|
470 #endif /* defined(_AIX) || defined(__DragonFly__) */
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|
|
471
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|
|
472 if (ss.ss_family == AF_INET || ss.ss_family == AF_INET6)
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|
|
473 return UV_TCP;
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|
|
474 if (ss.ss_family == AF_UNIX)
|
|
|
475 return UV_NAMED_PIPE;
|
|
|
476 }
|
|
|
477
|
|
|
478 return UV_UNKNOWN_HANDLE;
|
|
|
479 }
|
|
|
480
|
|
|
481
|
|
|
482 /* This function is async signal-safe, meaning that it's safe to call from
|
|
|
483 * inside a signal handler _unless_ execution was inside uv_tty_set_mode()'s
|
|
|
484 * critical section when the signal was raised.
|
|
|
485 */
|
|
|
486 int uv_tty_reset_mode(void) {
|
|
|
487 int saved_errno;
|
|
|
488 int err;
|
|
|
489
|
|
|
490 saved_errno = errno;
|
|
|
491
|
|
|
492 if (atomic_exchange(&termios_spinlock, 1))
|
|
|
493 return UV_EBUSY; /* In uv_tty_set_mode() or uv__tty_close(). */
|
|
|
494
|
|
|
495 err = 0;
|
|
|
496 if (orig_termios_fd != -1)
|
|
|
497 err = uv__tcsetattr(orig_termios_fd, TCSANOW, &orig_termios);
|
|
|
498
|
|
|
499 atomic_store(&termios_spinlock, 0);
|
|
|
500 errno = saved_errno;
|
|
|
501
|
|
|
502 return err;
|
|
|
503 }
|
|
|
504
|
|
|
505 void uv_tty_set_vterm_state(uv_tty_vtermstate_t state) {
|
|
|
506 }
|
|
|
507
|
|
|
508 int uv_tty_get_vterm_state(uv_tty_vtermstate_t* state) {
|
|
|
509 return UV_ENOTSUP;
|
|
|
510 }
|
