=Start=
缘由：
信息收集需要：IP/HOSTNAME
正文：
参考解答：
HOSTNAME的获取
- https://stackoverflow.com/questions/5190553/linux-c-get-server-hostname
- https://linux.die.net/man/2/gethostname
#include <stdio.h>#include <stdlib.h>#include <unistd.h>int main(void) { char hostname[1024]; gethostname(hostname, 1024); puts(hostname); return EXIT_SUCCESS;} |
IP的获取
- https://stackoverflow.com/questions/2283494/get-ip-address-of-an-interface-on-linux
- http://man7.org/linux/man-pages/man3/getifaddrs.3.html
- http://www.binarytides.com/get-local-ip-c-linux/
- http://www.binarytides.com/c-program-to-get-ip-address-from-interface-name-on-linux/
/* * Find local ip used as source ip in ip packets. * Read the /proc/net/route file */#include <stdio.h> //printf#include <string.h> //memset#include <errno.h> //errno#include <sys/socket.h>#include <netdb.h>#include <ifaddrs.h>#include <stdlib.h>#include <unistd.h>int main ( int argc , char *argv[] ){ FILE *f; char line[100] , *p , *c; f = fopen("/proc/net/route" , "r"); while(fgets(line , 100 , f)) { p = strtok(line , " \t"); c = strtok(NULL , " \t"); if(p!=NULL && c!=NULL) { if(strcmp(c , "00000000") == 0) { printf("Default interface is : %s \n" , p); break; } } } //which family do we require , AF_INET or AF_INET6 int fm = AF_INET; struct ifaddrs *ifaddr, *ifa; int family , s; char host[NI_MAXHOST]; if (getifaddrs(&ifaddr) == -1) { perror("getifaddrs"); exit(EXIT_FAILURE); } //Walk through linked list, maintaining head pointer so we can free list later for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) { if (ifa->ifa_addr == NULL) { continue; } family = ifa->ifa_addr->sa_family; if(strcmp( ifa->ifa_name , p) == 0) { if (family == fm) { s = getnameinfo( ifa->ifa_addr, (family == AF_INET) ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6) , host , NI_MAXHOST , NULL , 0 , NI_NUMERICHOST); if (s != 0) { printf("getnameinfo() failed: %s\n", gai_strerror(s)); exit(EXIT_FAILURE); } printf("address: %s", host); } printf("\n"); } } freeifaddrs(ifaddr); return 0;} |
&
#include <stdio.h>#include <sys/socket.h>#include <sys/ioctl.h>#include <linux/netdevice.h>#include <arpa/inet.h>#include <netinet/in.h>#include <unistd.h>int print_addresses(const int domain){ int s; struct ifconf ifconf; struct ifreq ifr[50]; int ifs; int i; s = socket(domain, SOCK_STREAM, 0); if (s < 0) { perror("socket"); return 0; } ifconf.ifc_buf = (char *) ifr; ifconf.ifc_len = sizeof ifr; if (ioctl(s, SIOCGIFCONF, &ifconf) == -1) { perror("ioctl"); return 0; } ifs = ifconf.ifc_len / sizeof(ifr[0]); printf("interfaces = %d:\n", ifs); for (i = 0; i < ifs; i++) { char ip[INET_ADDRSTRLEN]; struct sockaddr_in *s_in = (struct sockaddr_in *) &ifr[i].ifr_addr; if (!inet_ntop(domain, &s_in->sin_addr, ip, sizeof(ip))) { perror("inet_ntop"); return 0; } printf("%s - %s\n", ifr[i].ifr_name, ip); } close(s); return 1;}int main(int argc, char *argv[]){ int domains[] = { AF_INET, AF_INET6 }; int i; for (i = 0; i < sizeof(domains) / sizeof(domains[0]); i++) if (!print_addresses(domains[i])) return 1; return 0;} |
=END=