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annotate dep/animia/src/fd/kvm.cc @ 169:e44b7c428d7c

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dep/animia: add libkvm method (UNTESTED)
author Paper <mrpapersonic@gmail.com>
date Sun, 19 Nov 2023 17:30:38 -0500
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children 8f6f8dd2eb23
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169
e44b7c428d7c dep/animia: add libkvm method (UNTESTED)
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1 /* kvm.cc: provides support for libkvm in multiple BSDs
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2 **
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3 ** this is really the only way to get a thing that works on
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4 ** OpenBSD AND NetBSD.
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5 **
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6 ** Much of this file is taken from the fstat source code in
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7 ** NetBSD.
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8 */
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9
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10 #include <kvm.h>
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11
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12 namespace animia::internal::kvm {
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13
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14 static bool GetFilename(kvm_t* kvm, struct vnode *vp, std::string& name) {
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15 struct vnode vn;
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16 if (!kvm_read(kvm, vp, &vn, sizeof(*vn)))
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17 return 0;
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18
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19 struct filestat fst;
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20 const char* type = vfilestat(vn, &fst);
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21 if (type == dead)
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22 return false;
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23
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24 for (DEVS* d = devs; d != NULL; d = d->next) {
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25 if (d->fsid == fst->fsid && d->ino == fst->fileid) {
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26 name = d->name;
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27 break;
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28 }
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29 }
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30
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31 return true;
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32 }
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33
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34 static bool GetFilePath(kvm_t* kvm, fdfile_t* fp, std::string& path) {
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35 struct file file;
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36 fdfile_t fdfile;
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37
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38 if (!kvm_read(kvm, fp, &fdfile, sizeof(fdfile)))
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39 return false;
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40
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41 if (!fdfile.ff_file)
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42 return false;
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43
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44 if (!kvm_read(fdfile.ff_file, &file, sizeof(file)))
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45 return false;
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46
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47 if (file.f_type != DTYPE_VNODE)
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48 return false;
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49
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50 return GetFilename(kvm, file.f_data, path);
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51 }
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52
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53 static bool OpenFiles(kvm_t* kvm, struct kinfo_proc* p, open_file_proc_t open_file_proc) {
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54 if (p->proc->p_fd == 0 || p->proc->p_cwdi == 0)
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55 return false;
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56
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57 struct filedesc filed;
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58 if (!kvm_read(kvm, p->proc->p_fd, &filed, sizeof(filed)))
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59 return false;
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60
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61 if (filed.fd_lastfile == -1)
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62 return false;
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63
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64 struct cwdinfo cwdi;
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65 if (!kvm_read(kvm, p->proc->p_cwdi, &cwdi, sizeof(cwdi)))
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66 return false;
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67
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68 struct fdtab dt;
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69 if (!kvm_read(kvm, filed.fd_dt, &dt, sizeof(dt)))
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70 return false;
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71
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72 /* check for corrupted files? */
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73 if ((unsigned)filed.fd_lastfile >= dt.dt_nfiles || filed.fd_freefile > filed.fd_lastfile + 1)
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74 return false;
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75
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76 /* open files */
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77 std::unique_ptr<fdfile_t*[]> ofiles = nullptr;
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78 {
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79 ofiles.reset(malloc((filed.fd_lastfile + 1) * sizeof(fdfile_t*)));
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80 if (!ofiles.get())
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81 return false;
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82 }
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83
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84 if (!kvm_read(kvm, &filed.fd_dt->dt_ff, ofiles.get(), filed.fd_lastfile + 1 * (sizeof(fdfile_t*))))
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85 return false;
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86
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87 for (int i = 0; i <= filed.fd_lastfile; i++) {
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88 if (!ofiles[i])
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89 continue;
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90 std::string name;
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91 GetFilePath(kvm, ofiles[i], name);
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92 if (!open_file_proc(p->proc->p_pid, name))
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93 return false;
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94 }
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95
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96 return true;
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97 }
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98
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99 bool EnumerateOpenProcesses(process_proc_t process_proc) {
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100 char errbuf[_POSIX2_LINE_MAX];
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101 kvm_t* kernel = kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, errbuf);
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102 if (!kernel)
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103 return false;
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104
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105 int entries = 0;
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106 struct kinfo_proc* kinfo = kvm_getprocs(kernel, KERN_PROC_ALL, 0, sizeof(struct kinfo_proc), &nentries);
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107 if (!kinfo)
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108 return false;
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109
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110 for (int i = 0; i < entries; i++)
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111 if (!process_proc({kinfo[i].p_pid, kinfo[i].p_comm}))
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112 return false;
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113
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114 return true;
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115 }
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116
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117 bool EnumerateOpenFiles(std::set<pid_t>& pids, open_file_proc_t open_file_proc) {
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118 kvm_t* kernel = kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, errbuf);
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119 if (!kernel)
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120 return false;
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121
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122 for (const auto& pid : pids) {
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123 int cnt;
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124 struct kinfo_proc* kinfo = kvm_getprocs(kernel, KERN_PROC_PID, pid, &cnt);
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125 if (!kinfo)
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126 return false;
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127
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128 for (int i = 0; i < cnt; i++) {
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129 OpenFiles(kernel, kinfo, open_file_proc);
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130 }
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131 }
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132 }
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133
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Paper <mrpapersonic@gmail.com>
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