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 | * May be distributed under the conditions of the
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8 | * GNU Library General Public License
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9 | */
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10 |
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11 | #include "busybox.h"
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12 | #include <stdio.h>
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13 | #include <stdlib.h>
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14 | #include <unistd.h>
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15 | #include <string.h>
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16 | #include <limits.h>
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17 | #include <dirent.h>
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18 | #include <signal.h>
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19 | #include <sys/types.h>
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20 | #include <sys/ioctl.h>
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21 | #include <sys/stat.h>
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22 | #include <sys/socket.h>
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23 | #include <sys/sysmacros.h>
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24 |
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25 | #define FUSER_PROC_DIR "/proc"
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26 | #define FUSER_MAX_LINE 255
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27 |
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28 | #define FUSER_OPT_MOUNT 1
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29 | #define FUSER_OPT_KILL 2
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30 | #define FUSER_OPT_SILENT 4
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31 | #define FUSER_OPT_IP6 8
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32 | #define FUSER_OPT_IP4 16
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33 |
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34 | typedef struct inode_list {
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35 | ino_t inode;
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36 | dev_t dev;
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37 | struct inode_list *next;
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38 | } inode_list;
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39 |
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40 | typedef struct pid_list {
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41 | pid_t pid;
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42 | struct pid_list *next;
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43 | } pid_list;
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44 |
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45 | static int fuser_option(char *option)
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46 | {
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47 | int opt = 0;
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48 |
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49 | if(!(strlen(option))) return 0;
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50 | if(option[0] != '-') return 0;
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51 | ++option;
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52 | while(*option != '\0') {
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53 | if(*option == 'm') opt |= FUSER_OPT_MOUNT;
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54 | else if(*option == 'k') opt |= FUSER_OPT_KILL;
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55 | else if(*option == 's') opt |= FUSER_OPT_SILENT;
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56 | else if(*option == '6') opt |= FUSER_OPT_IP6;
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57 | else if(*option == '4') opt |= FUSER_OPT_IP4;
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58 | else {
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59 | bb_error_msg_and_die(
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60 | "Unsupported option '%c'", *option);
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61 | }
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62 | ++option;
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63 | }
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64 | return opt;
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65 | }
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66 |
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67 | static int fuser_file_to_dev_inode(const char *filename,
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68 | dev_t *dev, ino_t *inode)
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69 | {
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70 | struct stat f_stat;
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71 | if((stat(filename, &f_stat)) < 0) return 0;
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72 | *inode = f_stat.st_ino;
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73 | *dev = f_stat.st_dev;
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74 | return 1;
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75 | }
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76 |
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77 | static int fuser_find_socket_dev(dev_t *dev)
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78 | {
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79 | int fd = socket(PF_INET, SOCK_DGRAM,0);
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80 | struct stat buf;
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81 |
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82 | if (fd >= 0 && (fstat(fd, &buf)) == 0) {
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83 | *dev = buf.st_dev;
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84 | close(fd);
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85 | return 1;
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86 | }
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87 | return 0;
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88 | }
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89 |
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90 | static int fuser_parse_net_arg(const char *filename,
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91 | const char **proto, int *port)
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92 | {
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93 | char path[sizeof(FUSER_PROC_DIR)+12], tproto[5];
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94 |
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95 | if((sscanf(filename, "%d/%4s", port, tproto)) != 2) return 0;
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96 | sprintf(path, "%s/net/%s", FUSER_PROC_DIR, tproto);
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97 | if((access(path, R_OK)) != 0) return 0;
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98 | *proto = bb_xstrdup(tproto);
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99 | return 1;
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100 | }
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101 |
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102 | static int fuser_add_pid(pid_list *plist, pid_t pid)
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103 | {
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104 | pid_list *curr = NULL, *last = NULL;
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105 |
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106 | if(plist->pid == 0) plist->pid = pid;
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107 | curr = plist;
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108 | while(curr != NULL) {
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109 | if(curr->pid == pid) return 1;
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110 | last = curr;
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111 | curr = curr->next;
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112 | }
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113 | curr = xmalloc(sizeof(pid_list));
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114 | last->next = curr;
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115 | curr->pid = pid;
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116 | curr->next = NULL;
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117 | return 1;
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118 | }
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119 |
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120 | static int fuser_add_inode(inode_list *ilist, dev_t dev, ino_t inode)
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121 | {
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122 | inode_list *curr = NULL, *last = NULL;
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123 |
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124 | if(!ilist->inode && !ilist->dev) {
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125 | ilist->dev = dev;
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126 | ilist->inode = inode;
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127 | }
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128 | curr = ilist;
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129 | while(curr != NULL) {
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130 | if(curr->inode == inode && curr->dev == dev) return 1;
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131 | last = curr;
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132 | curr = curr->next;
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133 | }
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134 | curr = xmalloc(sizeof(inode_list));
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135 | last->next = curr;
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136 | curr->dev = dev;
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137 | curr->inode = inode;
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138 | curr->next = NULL;
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139 | return 1;
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140 | }
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141 |
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142 | static int fuser_scan_proc_net(int opts, const char *proto,
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143 | int port, inode_list *ilist)
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144 | {
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145 | char path[sizeof(FUSER_PROC_DIR)+12], line[FUSER_MAX_LINE+1];
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146 | char addr[128];
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147 | ino_t tmp_inode;
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148 | dev_t tmp_dev;
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149 | long long uint64_inode;
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150 | int tmp_port;
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151 | FILE *f;
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152 |
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153 | if(!fuser_find_socket_dev(&tmp_dev)) tmp_dev = 0;
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154 | sprintf(path, "%s/net/%s", FUSER_PROC_DIR, proto);
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155 |
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156 | if (!(f = fopen(path, "r"))) return 0;
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157 | while(fgets(line, FUSER_MAX_LINE, f)) {
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158 | if(sscanf(line,
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159 | "%*d: %64[0-9A-Fa-f]:%x %*x:%*x %*x %*x:%*x "
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160 | "%*x:%*x %*x %*d %*d %llu",
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161 | addr, &tmp_port, &uint64_inode) == 3) {
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162 | if((strlen(addr) == 8) &&
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163 | (opts & FUSER_OPT_IP6)) continue;
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164 | else if((strlen(addr) > 8) &&
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165 | (opts & FUSER_OPT_IP4)) continue;
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166 | if(tmp_port == port) {
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167 | tmp_inode = uint64_inode;
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168 | fuser_add_inode(ilist, tmp_dev, tmp_inode);
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169 | }
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170 | }
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171 |
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172 | }
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173 | fclose(f);
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174 | return 1;
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175 | }
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176 |
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177 | static int fuser_search_dev_inode(int opts, inode_list *ilist,
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178 | dev_t dev, ino_t inode)
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179 | {
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180 | inode_list *curr;
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181 | curr = ilist;
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182 |
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183 | while(curr) {
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184 | if((opts & FUSER_OPT_MOUNT) && curr->dev == dev)
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185 | return 1;
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186 | if(curr->inode == inode && curr->dev == dev)
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187 | return 1;
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188 | curr = curr->next;
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189 | }
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190 | return 0;
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191 | }
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192 |
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193 | static int fuser_scan_pid_maps(int opts, const char *fname, pid_t pid,
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194 | inode_list *ilist, pid_list *plist)
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195 | {
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196 | FILE *file;
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197 | char line[FUSER_MAX_LINE + 1];
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198 | int major, minor;
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199 | ino_t inode;
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200 | long long uint64_inode;
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201 | dev_t dev;
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202 |
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203 | if (!(file = fopen(fname, "r"))) return 0;
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204 | while (fgets(line, FUSER_MAX_LINE, file)) {
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205 | if(sscanf(line, "%*s %*s %*s %x:%x %llu",
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206 | &major, &minor, &uint64_inode) != 3) continue;
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207 | inode = uint64_inode;
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208 | if(major == 0 && minor == 0 && inode == 0) continue;
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209 | dev = makedev(major, minor);
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210 | if(fuser_search_dev_inode(opts, ilist, dev, inode)) {
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211 | fuser_add_pid(plist, pid);
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212 | }
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213 |
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214 | }
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215 | fclose(file);
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216 | return 1;
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217 | }
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218 |
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219 | static int fuser_scan_link(int opts, const char *lname, pid_t pid,
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220 | inode_list *ilist, pid_list *plist)
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221 | {
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222 | ino_t inode;
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223 | dev_t dev;
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224 |
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225 | if(!fuser_file_to_dev_inode(lname, &dev, &inode)) return 0;
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226 | if(fuser_search_dev_inode(opts, ilist, dev, inode))
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227 | fuser_add_pid(plist, pid);
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228 | return 1;
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229 | }
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230 |
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231 | static int fuser_scan_dir_links(int opts, const char *dname, pid_t pid,
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232 | inode_list *ilist, pid_list *plist)
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233 | {
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234 | DIR *d;
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235 | struct dirent *de;
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236 | char *lname;
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237 |
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238 | if((d = opendir(dname))) {
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239 | while((de = readdir(d)) != NULL) {
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240 | lname = concat_subpath_file(dname, de->d_name);
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241 | if(lname == NULL)
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242 | continue;
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243 | fuser_scan_link(opts, lname, pid, ilist, plist);
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244 | free(lname);
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245 | }
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246 | closedir(d);
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247 | }
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248 | else return 0;
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249 | return 1;
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250 |
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251 | }
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252 |
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253 | static int fuser_scan_proc_pids(int opts, inode_list *ilist, pid_list *plist)
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254 | {
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255 | DIR *d;
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256 | struct dirent *de;
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257 | pid_t pid;
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258 | char *dname;
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259 |
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260 | if(!(d = opendir(FUSER_PROC_DIR))) return 0;
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261 | while((de = readdir(d)) != NULL) {
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262 | pid = (pid_t)atoi(de->d_name);
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263 | if(!pid) continue;
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264 | dname = concat_subpath_file(FUSER_PROC_DIR, de->d_name);
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265 | if(chdir(dname) < 0) {
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266 | free(dname);
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267 | continue;
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268 | }
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269 | free(dname);
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270 | fuser_scan_link(opts, "cwd", pid, ilist, plist);
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271 | fuser_scan_link(opts, "exe", pid, ilist, plist);
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272 | fuser_scan_link(opts, "root", pid, ilist, plist);
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273 | fuser_scan_dir_links(opts, "fd", pid, ilist, plist);
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274 | fuser_scan_dir_links(opts, "lib", pid, ilist, plist);
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275 | fuser_scan_dir_links(opts, "mmap", pid, ilist, plist);
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276 | fuser_scan_pid_maps(opts, "maps", pid, ilist, plist);
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277 | chdir("..");
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278 | }
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279 | closedir(d);
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280 | return 1;
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281 | }
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282 |
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283 | static int fuser_print_pid_list(pid_list *plist)
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284 | {
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285 | pid_list *curr = plist;
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286 |
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287 | if(plist == NULL) return 0;
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288 | while(curr != NULL) {
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289 | if(curr->pid > 0) printf("%d ", curr->pid);
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290 | curr = curr->next;
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291 | }
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292 | printf("\n");
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293 | return 1;
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294 | }
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295 |
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296 | static int fuser_kill_pid_list(pid_list *plist, int sig)
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297 | {
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298 | pid_list *curr = plist;
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299 | pid_t mypid = getpid();
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300 | int success = 1;
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301 |
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302 | if(plist == NULL) return 0;
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303 | while(curr != NULL) {
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304 | if(curr->pid > 0 && curr->pid != mypid) {
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305 | if (kill(curr->pid, sig) != 0) {
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306 | bb_perror_msg(
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307 | "Could not kill pid '%d'", curr->pid);
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308 | success = 0;
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309 | }
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310 | }
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311 | curr = curr->next;
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312 | }
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313 | return success;
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314 | }
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315 |
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316 | int fuser_main(int argc, char **argv)
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317 | {
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318 | int port, i, optn;
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319 | int* fni; /* file name indexes of argv */
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320 | int fnic = 0; /* file name index count */
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321 | const char *proto;
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322 | static int opt = 0; /* FUSER_OPT_ */
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323 | dev_t dev;
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324 | ino_t inode;
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325 | pid_list *pids;
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326 | inode_list *inodes;
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327 | int killsig = SIGTERM;
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328 | int success = 1;
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329 |
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330 | if (argc < 2)
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331 | bb_show_usage();
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332 |
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333 | fni = xmalloc(sizeof(int));
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334 | for(i=1;i<argc;i++) {
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335 | optn = fuser_option(argv[i]);
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336 | if(optn) opt |= optn;
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337 | else if(argv[i][0] == '-') {
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338 | if(!(u_signal_names(argv[i]+1, &killsig, 0)))
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339 | killsig = SIGTERM;
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340 | }
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341 | else {
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342 | fni = xrealloc(fni, sizeof(int) * (fnic+2));
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343 | fni[fnic++] = i;
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344 | }
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345 | }
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346 | if(!fnic) return 1;
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347 |
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348 | pids = xmalloc(sizeof(pid_list));
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349 | inodes = xmalloc(sizeof(inode_list));
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350 | for(i=0;i<fnic;i++) {
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351 | if(fuser_parse_net_arg(argv[fni[i]], &proto, &port)) {
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352 | fuser_scan_proc_net(opt, proto, port, inodes);
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353 | }
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354 | else {
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355 | if(!fuser_file_to_dev_inode(
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356 | argv[fni[i]], &dev, &inode)) {
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357 | free(pids);
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358 | free(inodes);
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359 | bb_perror_msg_and_die(
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360 | "Could not open '%s'", argv[fni[i]]);
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361 | }
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362 | fuser_add_inode(inodes, dev, inode);
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363 | }
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364 | }
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365 | success = fuser_scan_proc_pids(opt, inodes, pids);
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366 | /* if the first pid in the list is 0, none have been found */
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367 | if(pids->pid == 0) success = 0;
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368 | if(success) {
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369 | if(opt & FUSER_OPT_KILL) {
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370 | success = fuser_kill_pid_list(pids, killsig);
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371 | }
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372 | else if(!(opt & FUSER_OPT_SILENT)) {
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373 | success = fuser_print_pid_list(pids);
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374 | }
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375 | }
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376 | free(pids);
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377 | free(inodes);
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378 | /* return 0 on (success == 1) 1 otherwise */
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379 | return (success != 1);
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380 | }
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