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fix bug: long_options have to be zero terminated
author Peter Meerwald <p.meerwald@bct-electronic.com>
date Fri, 20 Jul 2012 11:28:30 +0200
parents bbbfb3f97919
children
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0
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1
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2 #ifdef HAVE_CONFIG_H
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3 # include "config.h"
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4 #endif
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5
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6 #include <elf.h>
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7 #if defined(HAVE_SYS_LINK_H)
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8 # include <sys/link.h> /* Find DT_RPATH on Solaris 2.6 */
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9 #endif /* HAVE_SYS_LINK_H */
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10 #include <stdio.h>
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11 #include <string.h>
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12 #include <unistd.h>
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13 #include <sys/types.h>
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14 #include <sys/stat.h>
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15 #include <errno.h>
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16 #include <fcntl.h>
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17 #include "protos.h"
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18
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19 int
1
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20 elf32_open(const char *filename, int flags, Elf32_Ehdr *ehdr)
0
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21 {
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22 int fd;
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23
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24 fd = open(filename, flags);
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25 if (fd == -1)
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26 {
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27 perror ("open");
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28 return -1;
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29 }
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30
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31 if (read(fd, ehdr, sizeof(*ehdr)) != sizeof(*ehdr))
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32 {
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33 perror ("reading header");
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34 close(fd);
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35 return -1;
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36 }
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37
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38 if (0 != memcmp(ehdr->e_ident, ELFMAG, SELFMAG) ||
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39 ehdr->e_ident[EI_CLASS] != ELFCLASS32 ||
0
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40 ehdr->e_ident[EI_DATA] != ELFDATA2 ||
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41 ehdr->e_ident[EI_VERSION] != EV_CURRENT)
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42 {
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43 fprintf(stderr,
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44 #ifdef WORDS_BIGENDIAN
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45 "`%s' probably isn't a %d-bit MSB-first ELF file.\n",
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46 #else /* not WORD_BIGENDIAN */
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47 "`%s' probably isn't a %d-bit LSB-first ELF file.\n",
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48 #endif /* not WORD_BIGENDIAN */
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49 filename, 32);
0
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50 close(fd);
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51 errno = ENOEXEC; /* Hm, is this the best errno code to use? */
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52 return -1;
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53 }
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54
1
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55 printf("32-bit ELF file\n");
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56
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57 if (ehdr->e_phentsize != sizeof(Elf32_Phdr))
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58 {
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59 fprintf(stderr, "section size was read as %d, not %lu!\n",
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60 ehdr->e_phentsize, sizeof(Elf32_Phdr));
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61 close(fd);
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62 return -1;
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63 }
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64 return fd;
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65 }
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66
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67 int
1
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68 elf64_open(const char *filename, int flags, Elf64_Ehdr *ehdr)
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69 {
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70 int fd;
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71
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72 fd = open(filename, flags);
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73 if (fd == -1)
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74 {
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75 perror ("open");
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76 return -1;
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77 }
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78
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79 if (read(fd, ehdr, sizeof(*ehdr)) != sizeof(*ehdr))
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80 {
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81 perror ("reading header");
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82 close(fd);
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83 return -1;
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84 }
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85
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86 if (0 != memcmp(ehdr->e_ident, ELFMAG, SELFMAG) ||
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87 ehdr->e_ident[EI_CLASS] != ELFCLASS64 ||
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88 ehdr->e_ident[EI_DATA] != ELFDATA2 ||
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89 ehdr->e_ident[EI_VERSION] != EV_CURRENT)
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90 {
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91 fprintf(stderr,
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92 #ifdef WORDS_BIGENDIAN
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93 "`%s' probably isn't a %d-bit MSB-first ELF file.\n",
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94 #else /* not WORD_BIGENDIAN */
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95 "`%s' probably isn't a %d-bit LSB-first ELF file.\n",
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96 #endif /* not WORD_BIGENDIAN */
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97 filename, 64);
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98 close(fd);
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99 errno = ENOEXEC; /* Hm, is this the best errno code to use? */
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100 return -1;
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101 }
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102
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103 printf("64-bit ELF file\n");
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104
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105 if (ehdr->e_phentsize != sizeof(Elf64_Phdr))
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106 {
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107 fprintf(stderr, "section size was read as %d, not %lu!\n",
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108 ehdr->e_phentsize, sizeof(Elf64_Phdr));
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109 close(fd);
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110 return -1;
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111 }
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112 return fd;
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113 }
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114
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115 int
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116 elf32_find_dynamic_section(int fd, Elf32_Ehdr *ehdr, Elf32_Phdr *phdr)
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117 {
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118 int i;
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119 if (lseek(fd, ehdr->e_phoff, SEEK_SET) == -1)
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120 {
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121 perror ("positioning for sections");
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122 return 1;
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123 }
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124
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125 for (i = 0; i < ehdr->e_phnum; i++)
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126 {
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127 if (read(fd, phdr, sizeof(*phdr)) != sizeof(*phdr))
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128 {
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129 perror ("reading section header");
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130 return 1;
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131 }
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132 if (phdr->p_type == PT_DYNAMIC)
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133 break;
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134 }
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135 if (i == ehdr->e_phnum)
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136 {
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137 fprintf (stderr, "No dynamic section found.\n");
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138 return 2;
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139 }
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140
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141 if (0 == phdr->p_filesz)
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142 {
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143 fprintf (stderr, "Length of dynamic section is zero.\n");
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144 return 3;
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145 }
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146
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147 return 0;
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148 }
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149
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150 int
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151 elf64_find_dynamic_section(int fd, Elf64_Ehdr *ehdr, Elf64_Phdr *phdr)
0
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152 {
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153 int i;
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154 if (lseek(fd, ehdr->e_phoff, SEEK_SET) == -1)
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155 {
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156 perror ("positioning for sections");
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157 return 1;
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158 }
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159
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160 for (i = 0; i < ehdr->e_phnum; i++)
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161 {
b8f7423e385c import 0.13
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162 if (read(fd, phdr, sizeof(*phdr)) != sizeof(*phdr))
b8f7423e385c import 0.13
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163 {
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164 perror ("reading section header");
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165 return 1;
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166 }
b8f7423e385c import 0.13
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167 if (phdr->p_type == PT_DYNAMIC)
b8f7423e385c import 0.13
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168 break;
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169 }
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170 if (i == ehdr->e_phnum)
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171 {
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172 fprintf (stderr, "No dynamic section found.\n");
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173 return 2;
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174 }
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175
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176 if (0 == phdr->p_filesz)
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177 {
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178 fprintf (stderr, "Length of dynamic section is zero.\n");
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179 return 3;
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180 }
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181
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182 return 0;
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183 }
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184
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185 void
b8f7423e385c import 0.13
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186 elf_close(int fd)
b8f7423e385c import 0.13
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187 {
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188 close(fd);
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189 }
b8f7423e385c import 0.13
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190
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191 const char *
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192 elf_tagname(int tag)
b8f7423e385c import 0.13
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193 {
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194 switch (tag) {
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195 case DT_RPATH:
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196 return "RPATH";
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197 break;
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198 #if defined(DT_RUNPATH)
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199 case DT_RUNPATH:
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200 return "RUNPATH";
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201 break;
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202 #endif /* DT_RUNPATH */
b8f7423e385c import 0.13
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203 }
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204 return "UNKNOWN";
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205 }
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206
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207 int
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208 elf_dynpath_tag(int tag)
b8f7423e385c import 0.13
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209 {
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210 return ( tag == DT_RPATH
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211 #if defined(DT_RUNPATH)
b8f7423e385c import 0.13
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212 || tag == DT_RUNPATH
b8f7423e385c import 0.13
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213 #endif /* DT_RUNPATH */
b8f7423e385c import 0.13
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214 );
b8f7423e385c import 0.13
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215 }

Repositories maintained by Peter Meerwald, pmeerw@pmeerw.net.