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annotate src/lib/fdpass.c @ 8590:b9faf4db2a9f HEAD

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Updated copyright notices to include year 2009.
author Timo Sirainen <tss@iki.fi>
date Tue, 06 Jan 2009 09:25:38 -0500
parents b3c900eb7e83
children 00cd9aacd03c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
8590
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1 /* Copyright (c) 2002-2009 Dovecot authors, see the included COPYING file */
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2
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3 /*
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4 fdpass.c - File descriptor passing between processes via UNIX sockets
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5
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6 This isn't fully portable, but pretty much all UNIXes nowadays should
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7 support this. If you're having runtime problems with fd_read(), check the
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8 end of fd_read() and play with the if condition. If you're having problems
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9 with fd_send(), try defining BUGGY_CMSG_MACROS.
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10
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11 If this file doesn't compile at all, you should check if this is supported
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12 in your system at all. It may require some extra #define to enable it.
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13 If not, you're pretty much out of luck. Cygwin didn't last I checked.
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14 */
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15
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16 #define _XPG4_2
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17
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18 #if defined(irix) || defined (__irix__) || defined(sgi) || defined (__sgi__)
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19 # define _XOPEN_SOURCE 4 /* for IRIX */
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20 #endif
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21
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22 #if !defined(_AIX) && !defined(_XOPEN_SOURCE_EXTENDED)
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23 # define _XOPEN_SOURCE_EXTENDED /* for Tru64, breaks AIX */
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24 #endif
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25
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26 #ifdef HAVE_CONFIG_H
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27 # include "lib.h"
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28 #else
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29 # define i_assert(x)
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30 #endif
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31
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32 #include <string.h>
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33 #include <limits.h>
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34 #include <sys/types.h>
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35
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36 #include <sys/socket.h>
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37 #include <sys/un.h>
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38 #include <sys/uio.h>
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39
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40 #include "fdpass.h"
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41
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42 /* RFC 2292 defines CMSG_*() macros, but some operating systems don't have them
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43 so we'll define our own if they don't exist.
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44
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45 CMSG_LEN(data) is used to calculate size of sizeof(struct cmsghdr) +
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46 sizeof(data) and padding between them.
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47
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48 CMSG_SPACE(data) also calculates the padding needed after the data, in case
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49 multiple objects are sent.
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50
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51 cmsghdr contains cmsg_len field and two integers. cmsg_len is sometimes
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52 defined as sockaddr_t and sometimes size_t, so it can be either 32bit or
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53 64bit. This padding is added by compiler in sizeof(struct cmsghdr).
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54
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55 Padding required by CMSG_DATA() can vary. Usually it wants size_t or 32bit.
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56 With Solaris it's in _CMSG_DATA_ALIGNMENT (32bit), we assume others want
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57 size_t.
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58
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59 We don't really need CMSG_SPACE() to be exactly correct, because currently
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60 we send only one object at a time. But anyway I'm trying to keep that
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61 correct in case it's sometimes needed..
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62 */
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63
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64 #ifdef BUGGY_CMSG_MACROS
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65 /* Some OSes have broken CMSG macros in 64bit systems. The macros use 64bit
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66 alignment while kernel uses 32bit alignment. */
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67 # undef CMSG_SPACE
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68 # undef CMSG_LEN
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69 # undef CMSG_DATA
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70 # define CMSG_DATA(cmsg) ((char *)((cmsg) + 1))
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71 # define _CMSG_DATA_ALIGNMENT 4
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72 # define _CMSG_HDR_ALIGNMENT 4
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73 #endif
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74
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75 #ifndef CMSG_SPACE
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76 # define MY_ALIGN(len, align) \
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77 (((len) + align - 1) & ~(align - 1))
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78
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79 /* Alignment between cmsghdr and data */
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80 # ifndef _CMSG_DATA_ALIGNMENT
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81 # define _CMSG_DATA_ALIGNMENT sizeof(size_t)
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82 # endif
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83 /* Alignment between data and next cmsghdr */
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84 # ifndef _CMSG_HDR_ALIGNMENT
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85 # define _CMSG_HDR_ALIGNMENT sizeof(size_t)
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86 # endif
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87
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88 # define CMSG_SPACE(len) \
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89 (MY_ALIGN(sizeof(struct cmsghdr), _CMSG_DATA_ALIGNMENT) + \
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90 MY_ALIGN(len, _CMSG_HDR_ALIGNMENT))
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91 # define CMSG_LEN(len) \
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92 (MY_ALIGN(sizeof(struct cmsghdr), _CMSG_DATA_ALIGNMENT) + (len))
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93 #endif
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94
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95 #ifdef SCM_RIGHTS
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96
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97 ssize_t fd_send(int handle, int send_fd, const void *data, size_t size)
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98 {
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99 struct msghdr msg;
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100 struct iovec iov;
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101 struct cmsghdr *cmsg;
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102 char buf[CMSG_SPACE(sizeof(int))];
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103
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104 /* at least one byte is required to be sent with fd passing */
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105 i_assert(size > 0 && size < INT_MAX);
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106
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107 memset(&msg, 0, sizeof(struct msghdr));
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108
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109 iov.iov_base = (void *) data;
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110 iov.iov_len = size;
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111
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112 msg.msg_iov = &iov;
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113 msg.msg_iovlen = 1;
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114
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115 if (send_fd != -1) {
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116 /* set the control and controllen before CMSG_FIRSTHDR(). */
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117 memset(buf, 0, sizeof(buf));
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118 msg.msg_control = buf;
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119 msg.msg_controllen = sizeof(buf);
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120
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121 cmsg = CMSG_FIRSTHDR(&msg);
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122 cmsg->cmsg_level = SOL_SOCKET;
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123 cmsg->cmsg_type = SCM_RIGHTS;
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124 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
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125 *((int *) CMSG_DATA(cmsg)) = send_fd;
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126
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127 /* set the real length we want to use. Do it after all is
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128 set just in case CMSG macros required the extra padding
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129 in the end. */
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130 msg.msg_controllen = cmsg->cmsg_len;
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131 }
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132
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133 return sendmsg(handle, &msg, 0);
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134 }
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135
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136 #ifdef __osf__
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137 # define CHECK_MSG(msg) TRUE /* Tru64 */
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138 #else
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139 # define CHECK_MSG(msg) (msg).msg_controllen >= CMSG_SPACE(sizeof(int))
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140 #endif
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141
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142 #ifdef LINUX20
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143 /* Linux 2.0.x doesn't set any cmsg fields. Note that this might make some
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144 attacks possible so don't do it unless you really have to. */
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145 # define CHECK_CMSG(cmsg) ((cmsg) != NULL)
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146 #else
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147 # define CHECK_CMSG(cmsg) \
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148 ((cmsg) != NULL && \
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149 (size_t)(cmsg)->cmsg_len >= (size_t)CMSG_LEN(sizeof(int)) && \
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150 (cmsg)->cmsg_level == SOL_SOCKET && (cmsg)->cmsg_type == SCM_RIGHTS)
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151 #endif
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152
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153 ssize_t fd_read(int handle, void *data, size_t size, int *fd)
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154 {
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155 struct msghdr msg;
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156 struct iovec iov;
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157 struct cmsghdr *cmsg;
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158 ssize_t ret;
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159 char buf[CMSG_SPACE(sizeof(int))];
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160
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161 i_assert(size > 0 && size < INT_MAX);
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162
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163 memset(&msg, 0, sizeof (struct msghdr));
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164
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165 iov.iov_base = data;
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166 iov.iov_len = size;
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167
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168 msg.msg_iov = &iov;
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169 msg.msg_iovlen = 1;
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170
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171 memset(buf, 0, sizeof(buf));
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172 msg.msg_control = buf;
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173 msg.msg_controllen = sizeof(buf);
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174
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175 ret = recvmsg(handle, &msg, 0);
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176 if (ret <= 0) {
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177 *fd = -1;
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178 return ret;
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179 }
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180
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181 /* at least one byte transferred - we should have the fd now.
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182 do extra checks to make sure it really is an fd that is being
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183 transferred to avoid potential DoS conditions. some systems don't
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184 set all these values correctly however so CHECK_MSG() and
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185 CHECK_CMSG() are somewhat system dependent */
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186 cmsg = CMSG_FIRSTHDR(&msg);
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187 if (!CHECK_MSG(msg) || !CHECK_CMSG(cmsg))
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188 *fd = -1;
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189 else
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190 *fd = *((int *) CMSG_DATA(cmsg));
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191 return ret;
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192 }
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193
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194 #else
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195 # ifdef __GNUC__
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196 # warning SCM_RIGHTS not supported, privilege separation not possible
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197 # endif
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198 ssize_t fd_send(int handle ATTR_UNUSED, int send_fd ATTR_UNUSED,
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199 const void *data ATTR_UNUSED, size_t size ATTR_UNUSED)
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200 {
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201 errno = ENOSYS;
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202 return -1;
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203 }
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204
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205 ssize_t fd_read(int handle ATTR_UNUSED, void *data ATTR_UNUSED,
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206 size_t size ATTR_UNUSED, int *fd ATTR_UNUSED)
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207 {
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208 errno = ENOSYS;
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209 return -1;
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210 }
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211 #endif