1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * tiny fuser implementation
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4 | *
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5 | * Copyright 2004 Tony J. White
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6 | *
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7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | #include "libbb.h"
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11 |
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12 | #define MAX_LINE 255
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13 |
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14 | #define OPTION_STRING "mks64"
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15 | enum {
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16 | OPT_MOUNT = (1 << 0),
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17 | OPT_KILL = (1 << 1),
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18 | OPT_SILENT = (1 << 2),
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19 | OPT_IP6 = (1 << 3),
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20 | OPT_IP4 = (1 << 4),
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21 | };
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22 |
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23 | typedef struct inode_list {
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24 | struct inode_list *next;
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25 | ino_t inode;
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26 | dev_t dev;
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27 | } inode_list;
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28 |
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29 | typedef struct pid_list {
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30 | struct pid_list *next;
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31 | pid_t pid;
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32 | } pid_list;
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33 |
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34 |
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35 | struct globals {
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36 | pid_list *pid_list_head;
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37 | inode_list *inode_list_head;
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38 | };
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39 | #define G (*(struct globals*)&bb_common_bufsiz1)
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40 | #define INIT_G() do { } while (0)
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41 |
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42 |
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43 | static void add_pid(const pid_t pid)
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44 | {
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45 | pid_list **curr = &G.pid_list_head;
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46 |
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47 | while (*curr) {
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48 | if ((*curr)->pid == pid)
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49 | return;
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50 | curr = &(*curr)->next;
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51 | }
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52 |
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53 | *curr = xzalloc(sizeof(pid_list));
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54 | (*curr)->pid = pid;
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55 | }
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56 |
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57 | static void add_inode(const struct stat *st)
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58 | {
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59 | inode_list **curr = &G.inode_list_head;
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60 |
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61 | while (*curr) {
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62 | if ((*curr)->dev == st->st_dev
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63 | && (*curr)->inode == st->st_ino
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64 | ) {
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65 | return;
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66 | }
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67 | curr = &(*curr)->next;
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68 | }
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69 |
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70 | *curr = xzalloc(sizeof(inode_list));
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71 | (*curr)->dev = st->st_dev;
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72 | (*curr)->inode = st->st_ino;
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73 | }
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74 |
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75 | static void scan_proc_net(const char *path, unsigned port)
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76 | {
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77 | char line[MAX_LINE + 1];
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78 | long long uint64_inode;
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79 | unsigned tmp_port;
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80 | FILE *f;
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81 | struct stat st;
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82 | int fd;
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83 |
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84 | /* find socket dev */
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85 | st.st_dev = 0;
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86 | fd = socket(AF_INET, SOCK_DGRAM, 0);
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87 | if (fd >= 0) {
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88 | fstat(fd, &st);
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89 | close(fd);
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90 | }
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91 |
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92 | f = fopen_for_read(path);
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93 | if (!f)
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94 | return;
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95 |
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96 | while (fgets(line, MAX_LINE, f)) {
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97 | char addr[68];
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98 | if (sscanf(line, "%*d: %64[0-9A-Fa-f]:%x %*x:%*x %*x %*x:%*x "
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99 | "%*x:%*x %*x %*d %*d %llu",
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100 | addr, &tmp_port, &uint64_inode) == 3
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101 | ) {
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102 | int len = strlen(addr);
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103 | if (len == 8 && (option_mask32 & OPT_IP6))
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104 | continue;
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105 | if (len > 8 && (option_mask32 & OPT_IP4))
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106 | continue;
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107 | if (tmp_port == port) {
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108 | st.st_ino = uint64_inode;
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109 | add_inode(&st);
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110 | }
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111 | }
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112 | }
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113 | fclose(f);
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114 | }
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115 |
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116 | static int search_dev_inode(const struct stat *st)
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117 | {
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118 | inode_list *ilist = G.inode_list_head;
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119 |
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120 | while (ilist) {
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121 | if (ilist->dev == st->st_dev) {
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122 | if (option_mask32 & OPT_MOUNT)
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123 | return 1;
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124 | if (ilist->inode == st->st_ino)
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125 | return 1;
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126 | }
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127 | ilist = ilist->next;
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128 | }
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129 | return 0;
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130 | }
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131 |
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132 | static void scan_pid_maps(const char *fname, pid_t pid)
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133 | {
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134 | FILE *file;
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135 | char line[MAX_LINE + 1];
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136 | int major, minor;
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137 | long long uint64_inode;
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138 | struct stat st;
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139 |
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140 | file = fopen_for_read(fname);
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141 | if (!file)
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142 | return;
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143 |
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144 | while (fgets(line, MAX_LINE, file)) {
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145 | if (sscanf(line, "%*s %*s %*s %x:%x %llu", &major, &minor, &uint64_inode) != 3)
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146 | continue;
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147 | st.st_ino = uint64_inode;
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148 | if (major == 0 && minor == 0 && st.st_ino == 0)
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149 | continue;
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150 | st.st_dev = makedev(major, minor);
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151 | if (search_dev_inode(&st))
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152 | add_pid(pid);
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153 | }
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154 | fclose(file);
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155 | }
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156 |
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157 | static void scan_link(const char *lname, pid_t pid)
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158 | {
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159 | struct stat st;
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160 |
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161 | if (stat(lname, &st) >= 0) {
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162 | if (search_dev_inode(&st))
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163 | add_pid(pid);
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164 | }
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165 | }
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166 |
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167 | static void scan_dir_links(const char *dname, pid_t pid)
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168 | {
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169 | DIR *d;
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170 | struct dirent *de;
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171 | char *lname;
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172 |
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173 | d = opendir(dname);
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174 | if (!d)
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175 | return;
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176 |
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177 | while ((de = readdir(d)) != NULL) {
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178 | lname = concat_subpath_file(dname, de->d_name);
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179 | if (lname == NULL)
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180 | continue;
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181 | scan_link(lname, pid);
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182 | free(lname);
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183 | }
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184 | closedir(d);
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185 | }
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186 |
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187 | /* NB: does chdir internally */
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188 | static void scan_proc_pids(void)
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189 | {
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190 | DIR *d;
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191 | struct dirent *de;
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192 | pid_t pid;
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193 |
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194 | xchdir("/proc");
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195 | d = opendir("/proc");
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196 | if (!d)
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197 | return;
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198 |
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199 | while ((de = readdir(d)) != NULL) {
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200 | pid = (pid_t)bb_strtou(de->d_name, NULL, 10);
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201 | if (errno)
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202 | continue;
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203 | if (chdir(de->d_name) < 0)
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204 | continue;
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205 | scan_link("cwd", pid);
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206 | scan_link("exe", pid);
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207 | scan_link("root", pid);
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208 |
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209 | scan_dir_links("fd", pid);
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210 | scan_dir_links("lib", pid);
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211 | scan_dir_links("mmap", pid);
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212 |
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213 | scan_pid_maps("maps", pid);
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214 | xchdir("/proc");
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215 | }
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216 | closedir(d);
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217 | }
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218 |
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219 | int fuser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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220 | int fuser_main(int argc UNUSED_PARAM, char **argv)
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221 | {
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222 | pid_list *plist;
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223 | pid_t mypid;
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224 | char **pp;
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225 | struct stat st;
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226 | unsigned port;
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227 | int opt;
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228 | int exitcode;
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229 | int killsig;
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230 | /*
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231 | fuser [OPTIONS] FILE or PORT/PROTO
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232 | Find processes which use FILEs or PORTs
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233 | -m Find processes which use same fs as FILEs
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234 | -4 Search only IPv4 space
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235 | -6 Search only IPv6 space
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236 | -s Don't display PIDs
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237 | -k Kill found processes
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238 | -SIGNAL Signal to send (default: KILL)
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239 | */
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240 | /* Handle -SIGNAL. Oh my... */
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241 | killsig = SIGKILL; /* yes, the default is not SIGTERM */
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242 | pp = argv;
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243 | while (*++pp) {
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244 | char *arg = *pp;
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245 | if (arg[0] != '-')
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246 | continue;
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247 | if (arg[1] == '-' && arg[2] == '\0') /* "--" */
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248 | break;
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249 | if ((arg[1] == '4' || arg[1] == '6') && arg[2] == '\0')
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250 | continue; /* it's "-4" or "-6" */
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251 | opt = get_signum(&arg[1]);
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252 | if (opt < 0)
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253 | continue;
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254 | /* "-SIGNAL" option found. Remove it and bail out */
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255 | killsig = opt;
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256 | do {
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257 | pp[0] = arg = pp[1];
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258 | pp++;
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259 | } while (arg);
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260 | break;
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261 | }
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262 |
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263 | opt_complementary = "-1"; /* at least one param */
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264 | opt = getopt32(argv, OPTION_STRING);
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265 | argv += optind;
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266 |
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267 | pp = argv;
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268 | while (*pp) {
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269 | /* parse net arg */
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270 | char path[20], tproto[5];
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271 | if (sscanf(*pp, "%u/%4s", &port, tproto) != 2)
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272 | goto file;
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273 | sprintf(path, "/proc/net/%s", tproto);
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274 | if (access(path, R_OK) == 0) { /* PORT/PROTO */
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275 | scan_proc_net(path, port);
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276 | } else { /* FILE */
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277 | file:
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278 | xstat(*pp, &st);
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279 | add_inode(&st);
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280 | }
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281 | pp++;
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282 | }
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283 |
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284 | scan_proc_pids(); /* changes dir to "/proc" */
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285 |
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286 | mypid = getpid();
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287 | plist = G.pid_list_head;
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288 | while (1) {
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289 | if (!plist)
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290 | return EXIT_FAILURE;
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291 | if (plist->pid != mypid)
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292 | break;
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293 | plist = plist->next;
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294 | }
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295 |
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296 | exitcode = EXIT_SUCCESS;
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297 | do {
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298 | if (plist->pid != mypid) {
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299 | if (opt & OPT_KILL) {
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300 | if (kill(plist->pid, killsig) != 0) {
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301 | bb_perror_msg("kill pid %u", (unsigned)plist->pid);
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302 | exitcode = EXIT_FAILURE;
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303 | }
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304 | }
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305 | if (!(opt & OPT_SILENT)) {
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306 | printf("%u ", (unsigned)plist->pid);
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307 | }
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308 | }
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309 | plist = plist->next;
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310 | } while (plist);
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311 |
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312 | if (!(opt & (OPT_SILENT))) {
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313 | bb_putchar('\n');
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314 | }
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315 |
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316 | return exitcode;
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317 | }
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