Mercurial > dropbear

annotate scpmisc.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +0800
parents 9579377b5f8b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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952624727411 Add note about OpenSSH origin
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1 /* Dropbear Note: This file is based on OpenSSH 4.3p2. Avoid unnecessary
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2 changes to simplify future updates */
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3
4
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4 /*
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5 * Copyright (c) 2000 Markus Friedl. All rights reserved.
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6 *
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following conditions
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9 * are met:
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10 * 1. Redistributions of source code must retain the above copyright
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11 * notice, this list of conditions and the following disclaimer.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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26 */
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27
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28 /*RCSID("OpenBSD: misc.c,v 1.22 2003/09/18 08:49:45 markus Exp ");*/
4
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29
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30 /* For xmalloc, xfree etc:
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31 * Author: Tatu Ylonen <[email protected]>
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32 * Copyright (c) 1995 Tatu Ylonen <[email protected]>, Espoo, Finland
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33 * All rights reserved
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34 * Versions of malloc and friends that check their results, and never return
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35 * failure (they call fatal if they encounter an error).
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36 *
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37 * As far as I am concerned, the code I have written for this software
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38 * can be used freely for any purpose. Any derived versions of this
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39 * software must be clearly marked as such, and if the derived work is
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40 * incompatible with the protocol description in the RFC file, it must be
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41 * called by a name other than "ssh" or "Secure Shell".
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42 */
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43
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44 /*RCSID("OpenBSD: xmalloc.c,v 1.16 2001/07/23 18:21:46 stevesk Exp ");*/
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45
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46 #define _GNU_SOURCE
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47 #include "includes.h"
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48 #include "scpmisc.h"
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49
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50 void *
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51 xmalloc(size_t size)
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52 {
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53 void *ptr;
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54
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55 if (size == 0) {
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56 fprintf(stderr, "xmalloc: zero size\n");
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57 exit(EXIT_FAILURE);
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58 }
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59 ptr = malloc(size);
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60 if (ptr == NULL) {
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61 fprintf(stderr, "xmalloc: out of memory (allocating %lu bytes)\n", (u_long) size);
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62 exit(EXIT_FAILURE);
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63 }
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64 return ptr;
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65 }
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66
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67 void *
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68 xrealloc(void *ptr, size_t new_size)
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69 {
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70 void *new_ptr;
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71
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72 if (new_size == 0) {
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73 fprintf(stderr, "xrealloc: zero size\n");
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74 exit(EXIT_FAILURE);
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75 }
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76 if (ptr == NULL)
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77 new_ptr = malloc(new_size);
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78 else
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79 new_ptr = realloc(ptr, new_size);
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80 if (new_ptr == NULL) {
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81 fprintf(stderr, "xrealloc: out of memory (new_size %lu bytes)\n", (u_long) new_size);
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82 exit(EXIT_FAILURE);
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83 }
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84 return new_ptr;
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85 }
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86
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87 void
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88 xfree(void *ptr)
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89 {
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90 if (ptr == NULL) {
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91 fprintf(stderr, "xfree: NULL pointer given as argument\n");
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92 exit(EXIT_FAILURE);
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93 }
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94 free(ptr);
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95 }
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96
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97 char *
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98 xstrdup(const char *str)
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99 {
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100 size_t len;
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101 char *cp;
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102
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103 len = strlen(str) + 1;
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104 cp = xmalloc(len);
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105 strlcpy(cp, str, len);
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106 return cp;
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107 }
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108
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109 char *
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110 cleanhostname(char *host)
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111 {
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112 if (*host == '[' && host[strlen(host) - 1] == ']') {
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113 host[strlen(host) - 1] = '\0';
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114 return (host + 1);
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115 } else
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116 return host;
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117 }
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118
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119 char *
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120 colon(char *cp)
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121 {
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122 int flag = 0;
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123
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124 if (*cp == ':') /* Leading colon is part of file name. */
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125 return (0);
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126 if (*cp == '[')
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127 flag = 1;
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128
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129 for (; *cp; ++cp) {
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130 if (*cp == '@' && *(cp+1) == '[')
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131 flag = 1;
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132 if (*cp == ']' && *(cp+1) == ':' && flag)
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133 return (cp+1);
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134 if (*cp == ':' && !flag)
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135 return (cp);
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136 if (*cp == '/')
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137 return (0);
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138 }
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139 return (0);
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140 }
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141
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142 /* function to assist building execv() arguments */
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143 void
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144 addargs(arglist *args, char *fmt, ...)
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145 {
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146 va_list ap;
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147 char *cp;
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148 u_int nalloc;
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149 int r;
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150
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151 va_start(ap, fmt);
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152 r = vasprintf(&cp, fmt, ap);
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153 va_end(ap);
287
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
154 if (r == -1)
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parents: 38
diff changeset
155 fatal("addargs: argument too long");
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
157 nalloc = args->nalloc;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
158 if (args->list == NULL) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159 nalloc = 32;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
160 args->num = 0;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
161 } else if (args->num+2 >= nalloc)
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
162 nalloc *= 2;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
163
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
164 args->list = xrealloc(args->list, nalloc * sizeof(char *));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
165 args->nalloc = nalloc;
287
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
166 args->list[args->num++] = cp;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
167 args->list[args->num] = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168 }
287
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
169
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
170 void
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
171 replacearg(arglist *args, u_int which, char *fmt, ...)
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
172 {
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
173 va_list ap;
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
174 char *cp;
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
175 int r;
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parents: 38
diff changeset
176
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parents: 38
diff changeset
177 va_start(ap, fmt);
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parents: 38
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178 r = vasprintf(&cp, fmt, ap);
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parents: 38
diff changeset
179 va_end(ap);
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parents: 38
diff changeset
180 if (r == -1)
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parents: 38
diff changeset
181 fatal("replacearg: argument too long");
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parents: 38
diff changeset
182
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parents: 38
diff changeset
183 if (which >= args->num)
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parents: 38
diff changeset
184 fatal("replacearg: tried to replace invalid arg %d >= %d",
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
185 which, args->num);
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parents: 38
diff changeset
186 xfree(args->list[which]);
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
187 args->list[which] = cp;
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
188 }
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parents: 38
diff changeset
189
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
190 void
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
191 freeargs(arglist *args)
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
192 {
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
193 u_int i;
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parents: 38
diff changeset
194
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
195 if (args->list != NULL) {
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parents: 38
diff changeset
196 for (i = 0; i < args->num; i++)
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parents: 38
diff changeset
197 xfree(args->list[i]);
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parents: 38
diff changeset
198 xfree(args->list);
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parents: 38
diff changeset
199 args->nalloc = args->num = 0;
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parents: 38
diff changeset
200 args->list = NULL;
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
201 }
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
202 }
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
203
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
204 /*
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
205 * NB. duplicate __progname in case it is an alias for argv[0]
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
206 * Otherwise it may get clobbered by setproctitle()
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
207 */
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
208 char *ssh_get_progname(char *argv0)
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
209 {
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
210 char *p;
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
211
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
212 if (argv0 == NULL)
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
213 return ("unknown"); /* XXX */
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
214 p = strrchr(argv0, '/');
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parents: 38
diff changeset
215 if (p == NULL)
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
216 p = argv0;
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
217 else
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
218 p++;
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
219
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
220 return (xstrdup(p));
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
221 }
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
222
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
223 void fatal(char* fmt,...)
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
224 {
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parents: 38
diff changeset
225 va_list args;
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parents: 38
diff changeset
226 va_start(args, fmt);
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
227 vfprintf(stderr, fmt, args);
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
228 va_end(args);
1227
5dde22e8a189 scp: Have `fatal()' append a newline to the message
Michael Witten <mfwitten@gmail.com>
parents: 1226
diff changeset
229 fputc('\n', stderr);
287
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
230 exit(255);
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
231 }
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
232
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
233 void
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
234 sanitise_stdfd(void)
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
235 {
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
236 int nullfd, dupfd;
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
237
1387
e7f11ed5fe28 Use DROPBEAR_PATH_DEVNULL instead of undefined _PATH_DEVNULL
Ben Gardner <bgardner@wabtec.com>
parents: 1227
diff changeset
238 if ((nullfd = dupfd = open(DROPBEAR_PATH_DEVNULL, O_RDWR)) == -1) {
287
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
239 fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno));
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
240 exit(1);
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
241 }
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
242 while (++dupfd <= 2) {
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
243 /* Only clobber closed fds */
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Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
244 if (fcntl(dupfd, F_GETFL, 0) >= 0)
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
245 continue;
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
246 if (dup2(nullfd, dupfd) == -1) {
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
247 fprintf(stderr, "dup2: %s", strerror(errno));
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
248 exit(1);
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
249 }
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
250 }
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
251 if (nullfd > 2)
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
252 close(nullfd);
b72f98803e46 Update to scp from OpenSSH portable 4.3p2
Matt Johnston <matt@ucc.asn.au>
parents: 38
diff changeset
253 }