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258
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1 #include "animone/util/osx.h"
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2
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3 #include <memory>
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4 #include <string>
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5
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6 #include <libproc.h>
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7 #include <sys/sysctl.h>
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8
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9 namespace animone::internal::osx::util {
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10
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11 typedef CFTypeRef (*LSASNCreateWithPidSpec)(CFAllocatorRef, pid_t);
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12 typedef CFDictionaryRef (*LSCopyApplicationInformationSpec)(int, CFTypeRef, CFArrayRef);
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13
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14 /* retrieved dynamically from launchservices */
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15 static LSCopyApplicationInformationSpec LSCopyApplicationInformation = nullptr;
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16 static LSASNCreateWithPidSpec LSASNCreateWithPid = nullptr;
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17
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18 static CFStringRef kLSDisplayNameKey = nullptr;
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19 static CFStringRef kLSPIDKey = nullptr;
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20
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21 /* retrieved from LaunchServicesSPI.h in WebKit */
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22 static constexpr int kLSDefaultSessionID = -2;
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23
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24 static const CFStringRef kLaunchServicesBundleID = CFSTR("com.apple.LaunchServices");
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25
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26 static bool GetLaunchServicesPrivateSymbols() {
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27 CFBundleRef launch_services_bundle = CFBundleGetBundleWithIdentifier(kLaunchServicesBundleID);
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28 if (!launch_services_bundle)
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29 return false;
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30
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31 LSCopyApplicationInformation = reinterpret_cast<LSCopyApplicationInformationSpec>(
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32 CFBundleGetFunctionPointerForName(launch_services_bundle, CFSTR("_LSCopyApplicationInformation")));
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33 if (!LSCopyApplicationInformation)
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34 return false;
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35
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36 LSASNCreateWithPid = reinterpret_cast<LSASNCreateWithPidSpec>(
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37 CFBundleGetFunctionPointerForName(launch_services_bundle, CFSTR("_LSASNCreateWithPid")));
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38 if (!LSASNCreateWithPid)
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39 return false;
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40
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41 CFStringRef* ptr_kLSDisplayNameKey = reinterpret_cast<CFStringRef*>(
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42 CFBundleGetDataPointerForName(launch_services_bundle, CFSTR("_kLSDisplayNameKey")));
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43 if (!ptr_kLSDisplayNameKey)
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44 return false;
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45 kLSDisplayNameKey = *ptr_kLSDisplayNameKey;
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46
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47 CFStringRef* ptr_kLSPIDKey =
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48 reinterpret_cast<CFStringRef*>(CFBundleGetDataPointerForName(launch_services_bundle, CFSTR("_kLSPIDKey")));
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49 if (!ptr_kLSPIDKey)
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50 return false;
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51 kLSPIDKey = *ptr_kLSPIDKey;
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52
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53 return true;
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54 }
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55
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56 static bool LaunchServicesGetProcessName(pid_t pid, std::string& result) {
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57 if (!LSCopyApplicationInformation || !LSASNCreateWithPid || !kLSDisplayNameKey || !kLSPIDKey)
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58 if (!GetLaunchServicesPrivateSymbols())
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59 return false;
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60
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61 /* what the hell is an `asn`? */
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62 CFPtr<CFTypeRef> asn = LSASNCreateWithPid(kCFAllocatorDefault, pid);
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63 if (!asn)
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64 return false;
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65
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66 CFPtr<CFArrayRef> request_array = CFArrayCreate(NULL, (const void**)kLSDisplayNameKey, 1, NULL);
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67 if (!request_array)
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68 return false;
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69
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70 CFPtr<CFDictionaryRef> dictionary =
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71 LSCopyApplicationInformation(kLSDefaultSessionID, asn.get(), request_array.get());
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72 if (!dictionary)
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73 return false;
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74
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75 {
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76 /* this doesn't need to be free'd */
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77 CFStringRef rstr;
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78
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79 if (!CFDictionaryGetValueIfPresent(dictionary, kLSDisplayNameKey, (CFTypeRef*)&rstr) || !rstr)
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80 return false;
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81
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82 if (!StringFromCFString(rstr, result))
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83 return false;
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84 }
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85
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86 result.resize(result.find('\0'));
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87
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88 return true;
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89 }
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90
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91 bool StringFromCFString(CFStringRef string, std::string& result) {
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92 if (!string)
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93 return false;
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94
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95 result.resize(CFStringGetMaximumSizeForEncoding(CFStringGetLength(string), kCFStringEncodingUTF8) + 1);
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96 if (!CFStringGetCString(string, &result.front(), result.length(), kCFStringEncodingUTF8))
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97 return false;
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98
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99 return true;
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100 }
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101
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102 static bool GetProcessArgs(pid_t pid, std::string& args) {
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103 /* sysctl shouldn't touch these, so we define them as const */
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104 int mib[3] = {CTL_KERN, KERN_PROCARGS2, static_cast<int>(pid)};
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105 const size_t mib_size = sizeof(mib) / sizeof(*mib);
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106
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107 /* Get the initial size of the array
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108 *
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109 * NOTE: it IS possible for this value to change inbetween calls to sysctl().
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110 * Unfortunately, I couldn't care less about handling this. :)
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111 *
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112 * is that really true, though? these should be constant values. but are
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113 * argc and argv *really* constant?
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114 */
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115 size_t size;
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116 {
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117 int ret = sysctl((int*)mib, mib_size, nullptr, &size, nullptr, 0);
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118 if (ret)
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119 return false;
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120 }
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121
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122 /* Reserve the space for it in args */
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123 args.resize(size);
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124
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125 /* Get the contents of argc and argv */
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126 {
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127 int ret = sysctl((int*)mib, mib_size, &args.front(), &size, NULL, 0);
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128 if (ret)
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129 return false;
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130 }
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131
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132 /* Is the size big enough to hold at least argc? */
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133 if (size < sizeof(int))
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134 return false;
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135
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136 args.resize(size);
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137 return true;
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138 }
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139
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140 static bool GetProcessNameFromArgs(pid_t pid, std::string& result) {
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141 if (!GetProcessArgs(pid, result))
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142 return false;
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143
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144 /* Get argc using memcpy */
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145 int argc = 0;
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146 memcpy(&argc, &result.front(), sizeof(argc));
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147
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148 /* Do we even have argv[0]? */
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149 if (argc < 1)
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150 return false;
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151
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152 /* Find the first null character */
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153 size_t null_pos = result.find('\0', sizeof(argc));
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154 if (null_pos == std::string::npos)
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155 return false;
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156
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157 /* Find the last slash */
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158 size_t last_slash = result.rfind('/', null_pos);
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159 if (last_slash == std::string::npos)
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160 return false;
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161
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162 /* Return our result */
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163 result = result.substr(last_slash + 1, null_pos - last_slash - 1);
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164 return true;
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165 }
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166
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167 static bool GetProcessNameFromKernel(pid_t pid, std::string& result) {
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168 result.resize(2 * MAXCOMLEN);
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169
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170 int size = proc_name(pid, &result.front(), result.length());
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171 if (!size)
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172 return false;
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173
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174 result.resize(size);
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175 return true;
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176 }
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177
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178 bool GetProcessName(pid_t pid, std::string& result) {
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179 if (LaunchServicesGetProcessName(pid, result))
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180 return true;
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181
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182 /* Try parsing the arguments, this prevents the process name being
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183 * cut off to 2*MAXCOMLEN (32 chars) */
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184 if (GetProcessNameFromArgs(pid, result))
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185 return true;
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186
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187 /* Then attempt getting it from the kernel, which results in the
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188 * process name being cut to 32 chars (worse, 16 chars if p_name is
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189 * unavailable) */
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190 if (GetProcessNameFromKernel(pid, result))
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191 return true;
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192
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193 return false;
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194 }
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195
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196 } // namespace animone::internal::osx::util
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