diff options
Diffstat (limited to 'mdk-stage1/dietlibc/lib/if_nameindex.c')
-rw-r--r-- | mdk-stage1/dietlibc/lib/if_nameindex.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/mdk-stage1/dietlibc/lib/if_nameindex.c b/mdk-stage1/dietlibc/lib/if_nameindex.c new file mode 100644 index 000000000..fc0e1c0ff --- /dev/null +++ b/mdk-stage1/dietlibc/lib/if_nameindex.c @@ -0,0 +1,40 @@ +#include <net/if.h> +#include <unistd.h> +#include <string.h> +#include <stdlib.h> +#include <sys/ioctl.h> +#include <stdio.h> + +struct if_nameindex* if_nameindex(void) { + struct ifconf ic; + int fd,len,i; + struct if_nameindex* x,* y; + char *dest; + fd=socket(AF_INET6,SOCK_DGRAM,0); + if (fd<0) fd=socket(AF_INET,SOCK_DGRAM,0); + ic.ifc_buf=0; + ic.ifc_len=0; + if (ioctl(fd,SIOCGIFCONF,&ic)<0) { +b0rken: + close(fd); + return 0; + } + ic.ifc_buf=alloca((size_t)ic.ifc_len); + if (ioctl(fd,SIOCGIFCONF,&ic)<0) goto b0rken; + len=(ic.ifc_len/sizeof(struct ifreq)); + x=(struct if_nameindex*)malloc((len+1)*sizeof(struct if_nameindex)+len*IFNAMSIZ); + if (!x) goto b0rken; + dest=(char*)(x+len+1); + y=x; + for (i=0; i<len; ++i) { + struct ifreq* ir=(struct ifreq*)&ic.ifc_req[i]; + y->if_name=dest; + memcpy(dest,ir->ifr_name,IFNAMSIZ); + if (ioctl(fd,SIOCGIFINDEX,ir)==-1) continue; + y->if_index=ir->ifr_ifindex; + dest+=IFNAMSIZ; + ++y; + } + y->if_name=0; y->if_index=0; + return x; +} |