| #include <net-snmp/net-snmp-config.h> |
| |
| #include "get_pid_from_inode.h" |
| |
| #include <net-snmp/output_api.h> |
| |
| #include <ctype.h> |
| #include <stdio.h> |
| #if HAVE_STDLIB_H |
| #include <stdlib.h> |
| #endif |
| #if HAVE_STRING_H |
| #include <string.h> |
| #else |
| #include <strings.h> |
| #endif |
| #if HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| |
| # define PROC_PATH "/proc" |
| # define SOCKET_TYPE_1 "socket:[" |
| # define SOCKET_TYPE_2 "[0000]:" |
| |
| pid_t |
| netsnmp_get_pid_from_inode(ino64_t inode) |
| { |
| DIR *procdirs = NULL, *piddirs = NULL; |
| char path_name[PATH_MAX + 1]; |
| char socket_lnk[NAME_MAX + 1]; |
| int filelen = 0, readlen = 0, iflag = 0; |
| struct dirent *procinfo, *pidinfo; |
| pid_t pid = 0; |
| ino64_t temp_inode; |
| |
| if (inode == 0) { |
| /* an inode set to zero means it is not associated with a process. */ |
| return 0; |
| } |
| |
| if (!(procdirs = opendir(PROC_PATH))) { |
| NETSNMP_LOGONCE((LOG_ERR, "snmpd: cannot open /proc\n")); |
| return 0; |
| } |
| |
| while ((procinfo = readdir(procdirs)) != NULL) { |
| const char* name = procinfo->d_name; |
| for (; *name; name++) { |
| if (!isdigit(*name)) |
| break; |
| } |
| if(*name) |
| continue; |
| |
| memset(path_name, '\0', PATH_MAX + 1); |
| filelen = snprintf(path_name, PATH_MAX, |
| PROC_PATH "/%s/fd/", procinfo->d_name); |
| if (filelen <= 0 || PATH_MAX < filelen) |
| continue; |
| |
| if (!(piddirs = opendir(path_name))) |
| continue; |
| |
| while ((pidinfo = readdir(piddirs)) != NULL) { |
| if (filelen + strlen(pidinfo->d_name) > PATH_MAX) |
| continue; |
| |
| strcpy(path_name + filelen, pidinfo->d_name); |
| |
| memset(socket_lnk, '\0', NAME_MAX + 1); |
| readlen = readlink(path_name, socket_lnk, NAME_MAX); |
| if (readlen < 0) |
| continue; |
| socket_lnk[readlen] = '\0'; |
| |
| if (!strncmp(socket_lnk, SOCKET_TYPE_1, 8)) { |
| temp_inode = strtoull(socket_lnk + 8, NULL, 0); |
| } else if (!strncmp(socket_lnk, SOCKET_TYPE_2, 7)) { |
| temp_inode = strtoull(socket_lnk + 7, NULL, 0); |
| } else |
| temp_inode = 0; |
| if (inode == temp_inode) { |
| pid = strtoul(procinfo->d_name, NULL, 0); |
| iflag = 1; |
| break; |
| } |
| } |
| closedir(piddirs); |
| if (iflag == 1) |
| break; |
| } |
| if (procdirs) |
| closedir(procdirs); |
| return pid; |
| } |