diff options
Diffstat (limited to 'libc/inet/if_index.c')
-rw-r--r-- | libc/inet/if_index.c | 133 |
1 files changed, 131 insertions, 2 deletions
diff --git a/libc/inet/if_index.c b/libc/inet/if_index.c index dfddbc0d4..40e46d538 100644 --- a/libc/inet/if_index.c +++ b/libc/inet/if_index.c @@ -36,6 +36,8 @@ #include <sys/ioctl.h> #include <libc-internal.h> +#include "netlinkaccess.h" + extern int __opensock(void) attribute_hidden; unsigned int @@ -78,7 +80,9 @@ if_freenameindex (struct if_nameindex *ifn) } free (ifn); } +hidden_strong_alias(if_freenameindex,__if_freenameindex) +#if !__ASSUME_NETLINK_SUPPORT struct if_nameindex * if_nameindex (void) { @@ -157,6 +161,131 @@ if_nameindex (void) return idx; #endif } +#else +struct if_nameindex * +if_nameindex (void) +{ + unsigned int nifs = 0; + struct netlink_handle nh = { 0, 0, 0, NULL, NULL }; + struct if_nameindex *idx = NULL; + struct netlink_res *nlp; + + if (__netlink_open (&nh) < 0) + return NULL; + + + /* Tell the kernel that we wish to get a list of all + active interfaces. Collect all data for every interface. */ + if (__netlink_request (&nh, RTM_GETLINK) < 0) + goto exit_free; + + /* Count the interfaces. */ + for (nlp = nh.nlm_list; nlp; nlp = nlp->next) + { + struct nlmsghdr *nlh; + size_t size = nlp->size; + + if (nlp->nlh == NULL) + continue; + + /* Walk through all entries we got from the kernel and look, which + message type they contain. */ + for (nlh = nlp->nlh; NLMSG_OK (nlh, size); nlh = NLMSG_NEXT (nlh, size)) + { + /* Check if the message is what we want. */ + if ((pid_t) nlh->nlmsg_pid != nh.pid || nlh->nlmsg_seq != nlp->seq) + continue; + + if (nlh->nlmsg_type == NLMSG_DONE) + break; /* ok */ + + if (nlh->nlmsg_type == RTM_NEWLINK) + ++nifs; + } + } + + idx = malloc ((nifs + 1) * sizeof (struct if_nameindex)); + if (idx == NULL) + { + nomem: + __set_errno (ENOBUFS); + goto exit_free; + } + + /* Add the interfaces. */ + nifs = 0; + for (nlp = nh.nlm_list; nlp; nlp = nlp->next) + { + struct nlmsghdr *nlh; + size_t size = nlp->size; + + if (nlp->nlh == NULL) + continue; + + /* Walk through all entries we got from the kernel and look, which + message type they contain. */ + for (nlh = nlp->nlh; NLMSG_OK (nlh, size); nlh = NLMSG_NEXT (nlh, size)) + { + /* Check if the message is what we want. */ + if ((pid_t) nlh->nlmsg_pid != nh.pid || nlh->nlmsg_seq != nlp->seq) + continue; + + if (nlh->nlmsg_type == NLMSG_DONE) + break; /* ok */ + + if (nlh->nlmsg_type == RTM_NEWLINK) + { + struct ifinfomsg *ifim = (struct ifinfomsg *) NLMSG_DATA (nlh); + struct rtattr *rta = IFLA_RTA (ifim); + size_t rtasize = IFLA_PAYLOAD (nlh); + + idx[nifs].if_index = ifim->ifi_index; + + while (RTA_OK (rta, rtasize)) + { + char *rta_data = RTA_DATA (rta); + size_t rta_payload = RTA_PAYLOAD (rta); + + if (rta->rta_type == IFLA_IFNAME) + { + idx[nifs].if_name = __strndup (rta_data, rta_payload); + if (idx[nifs].if_name == NULL) + { + idx[nifs].if_index = 0; + __if_freenameindex (idx); + idx = NULL; + goto nomem; + } + break; + } + + rta = RTA_NEXT (rta, rtasize); + } + + ++nifs; + } + } + } + + idx[nifs].if_index = 0; + idx[nifs].if_name = NULL; + + exit_free: + __netlink_free_handle (&nh); + __netlink_close (&nh); + + return idx; +} +#endif +hidden_strong_alias(if_nameindex,__if_nameindex) + +#if 0 +struct if_nameindex * +if_nameindex (void) +{ + return (if_nameindex_netlink () != NULL ? : if_nameindex_ioctl ()); +} +#endif char * if_indextoname (unsigned int ifindex, char *ifname) @@ -194,7 +323,7 @@ if_indextoname (unsigned int ifindex, char *ifname) struct if_nameindex *p; char *result = NULL; - idx = if_nameindex(); + idx = __if_nameindex(); if (idx != NULL) { @@ -205,7 +334,7 @@ if_indextoname (unsigned int ifindex, char *ifname) break; } - if_freenameindex (idx); + __if_freenameindex (idx); if (result == NULL) __set_errno (ENXIO); |