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(netlink_receive): Allocate only one block. (free_netlink_handle): Adjust appropriately. (getifaddrs): Lots of cleanups.

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This commit is contained in:
Ulrich Drepper 2003-04-16 22:50:37 +00:00
parent dd9d65384e
commit 5bdd77cb60
1 changed files with 35 additions and 49 deletions
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84
sysdeps/unix/sysv/linux/ifaddrs.c
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@ -102,7 +102,6 @@ free_netlink_handle (struct netlink_handle *h)
{ {
struct netlink_res *tmpptr; struct netlink_res *tmpptr;
free (ptr->nlh);
tmpptr = ptr->next; tmpptr = ptr->next;
free (ptr); free (ptr);
ptr = tmpptr; ptr = tmpptr;
@ -169,17 +168,12 @@ netlink_receive (struct netlink_handle *h)
if (msg.msg_flags & MSG_TRUNC) if (msg.msg_flags & MSG_TRUNC)
return -1; return -1;
nlm_next = (struct netlink_res *) malloc (sizeof (struct netlink_res)); nlm_next = (struct netlink_res *) malloc (sizeof (struct netlink_res)
+ read_len);
if (nlm_next == NULL) if (nlm_next == NULL)
return -1; return -1;
nlm_next->next = NULL; nlm_next->next = NULL;
nlm_next->nlh = (struct nlmsghdr *) malloc (read_len); nlm_next->nlh = memcpy (nlm_next + 1, buf, read_len);
if (nlm_next->nlh == NULL)
{
free (nlm_next);
return -1;
}
memcpy (nlm_next->nlh, buf, read_len);
nlm_next->size = read_len; nlm_next->size = read_len;
nlm_next->seq = h->seq; nlm_next->seq = h->seq;
if (h->nlm_list == NULL) if (h->nlm_list == NULL)
@ -202,7 +196,7 @@ netlink_receive (struct netlink_handle *h)
if (nlmh->nlmsg_type == NLMSG_DONE) if (nlmh->nlmsg_type == NLMSG_DONE)
{ {
/* we found the end, leave the loop. */ /* We found the end, leave the loop. */
done = true; done = true;
break; break;
} }
@ -273,7 +267,7 @@ map_newlink (int index, int *map, int max)
return i; return i;
} }
/* This should never be reached. If this will be reached, we have /* This should never be reached. If this will be reached, we have
very big problem. */ a very big problem. */
abort (); abort ();
} }
@ -292,6 +286,7 @@ getifaddrs (struct ifaddrs **ifap)
size_t ifa_data_size = 0; /* Size to allocate for all ifa_data. */ size_t ifa_data_size = 0; /* Size to allocate for all ifa_data. */
char *ifa_data_ptr; /* Pointer to the unused part of memory for char *ifa_data_ptr; /* Pointer to the unused part of memory for
ifa_data. */ ifa_data. */
int result = 0;
if (ifap) if (ifap)
*ifap = NULL; *ifap = NULL;
@ -316,15 +311,14 @@ getifaddrs (struct ifaddrs **ifap)
active interfaces. */ active interfaces. */
if (netlink_sendreq (&nh, RTM_GETLINK) < 0) if (netlink_sendreq (&nh, RTM_GETLINK) < 0)
{ {
netlink_close (&nh); result = -1;
return -1; goto exit_close;
} }
/* Collect all data for every interface. */ /* Collect all data for every interface. */
if (netlink_receive (&nh) < 0) if (netlink_receive (&nh) < 0)
{ {
free_netlink_handle (&nh); result = -1;
netlink_close (&nh); goto exit_free;
return -1;
} }
@ -333,18 +327,12 @@ getifaddrs (struct ifaddrs **ifap)
interfaces in the list, we will later always find the interfaces in the list, we will later always find the
interface before the corresponding addresses. */ interface before the corresponding addresses. */
++nh.seq; ++nh.seq;
if (netlink_sendreq (&nh, RTM_GETADDR) < 0) if (netlink_sendreq (&nh, RTM_GETADDR) < 0
/* Collect all data for every interface. */
|| netlink_receive (&nh) < 0)
{ {
free_netlink_handle (&nh); result = -1;
netlink_close (&nh); goto exit_free;
return -1;
}
/* Collect all data for every inerface. */
if (netlink_receive (&nh) < 0)
{
free_netlink_handle (&nh);
netlink_close (&nh);
return -1;
} }
/* Count all RTM_NEWLINK and RTM_NEWADDR entries to allocate /* Count all RTM_NEWLINK and RTM_NEWADDR entries to allocate
@ -399,11 +387,7 @@ getifaddrs (struct ifaddrs **ifap)
/* Return if no interface is up. */ /* Return if no interface is up. */
if ((newlink + newaddr) == 0) if ((newlink + newaddr) == 0)
{ goto exit_free;
free_netlink_handle (&nh);
netlink_close (&nh);
return 0;
}
/* Table for mapping kernel index to entry in our list. */ /* Table for mapping kernel index to entry in our list. */
map_newlink_data = alloca (newlink * sizeof (int)); map_newlink_data = alloca (newlink * sizeof (int));
@ -416,9 +400,8 @@ getifaddrs (struct ifaddrs **ifap)
+ ifa_data_size); + ifa_data_size);
if (ifas == NULL) if (ifas == NULL)
{ {
free_netlink_handle (&nh); result = -1;
netlink_close (&nh); goto exit_free;
return -1;
} }
for (i = 0; i < newlink + newaddr - 1; i++) for (i = 0; i < newlink + newaddr - 1; i++)
@ -426,7 +409,7 @@ getifaddrs (struct ifaddrs **ifap)
ifas[i].ifa.ifa_next = &ifas[i + 1].ifa; ifas[i].ifa.ifa_next = &ifas[i + 1].ifa;
map_newlink_data[i] = -1; map_newlink_data[i] = -1;
} }
ifa_data_ptr = (char *)&ifas[newlink + newaddr]; ifa_data_ptr = (char *) &ifas[newlink + newaddr];
newaddr_idx = 0; /* Counter for newaddr index. */ newaddr_idx = 0; /* Counter for newaddr index. */
/* Walk through the list of data we got from the kernel. */ /* Walk through the list of data we got from the kernel. */
@ -446,13 +429,14 @@ getifaddrs (struct ifaddrs **ifap)
{ {
int ifa_index = 0; int ifa_index = 0;
/* check if the message is the one we want */ /* Check if the message is the one we want */
if ((pid_t) nlh->nlmsg_pid != nh.pid || nlh->nlmsg_seq != nlp->seq) if ((pid_t) nlh->nlmsg_pid != nh.pid || nlh->nlmsg_seq != nlp->seq)
continue; continue;
if (nlh->nlmsg_type == NLMSG_DONE) if (nlh->nlmsg_type == NLMSG_DONE)
break; /* ok */ break; /* ok */
else if (nlh->nlmsg_type == RTM_NEWLINK)
if (nlh->nlmsg_type == RTM_NEWLINK)
{ {
/* We found a new interface. Now extract everything from the /* We found a new interface. Now extract everything from the
interface data we got and need. */ interface data we got and need. */
@ -460,7 +444,7 @@ getifaddrs (struct ifaddrs **ifap)
struct rtattr *rta = IFLA_RTA (ifim); struct rtattr *rta = IFLA_RTA (ifim);
size_t rtasize = IFLA_PAYLOAD (nlh); size_t rtasize = IFLA_PAYLOAD (nlh);
/* interfaces are stored in the first "newlink" entries /* Interfaces are stored in the first "newlink" entries
of our list, starting in the order as we got from the of our list, starting in the order as we got from the
kernel. */ kernel. */
ifa_index = map_newlink (ifim->ifi_index - 1, ifa_index = map_newlink (ifim->ifi_index - 1,
@ -537,7 +521,7 @@ getifaddrs (struct ifaddrs **ifap)
size_t rtasize = IFA_PAYLOAD (nlh); size_t rtasize = IFA_PAYLOAD (nlh);
/* New Addresses are stored in the order we got them from /* New Addresses are stored in the order we got them from
the kernel after interfaces. Theoretical it is possible the kernel after interfaces. Theoretically it is possible
that we have holes in the interface part of the list, that we have holes in the interface part of the list,
but we always have already the interface for this address. */ but we always have already the interface for this address. */
ifa_index = newlink + newaddr_idx; ifa_index = newlink + newaddr_idx;
@ -662,10 +646,10 @@ getifaddrs (struct ifaddrs **ifap)
case AF_INET6: case AF_INET6:
memcpy (&ifas[ifa_index].broadaddr.s6.sin6_addr, memcpy (&ifas[ifa_index].broadaddr.s6.sin6_addr,
rta_data, rta_payload); rta_data, rta_payload);
if (IN6_IS_ADDR_LINKLOCAL (rta_data) || if (IN6_IS_ADDR_LINKLOCAL (rta_data)
IN6_IS_ADDR_MC_LINKLOCAL (rta_data)) || IN6_IS_ADDR_MC_LINKLOCAL (rta_data))
ifas[ifa_index].broadaddr.s6.sin6_scope_id = ifas[ifa_index].broadaddr.s6.sin6_scope_id
ifam->ifa_scope; = ifam->ifa_scope;
break; break;
default: default:
@ -754,14 +738,16 @@ getifaddrs (struct ifaddrs **ifap)
} }
} }
free_netlink_handle (&nh);
netlink_close (&nh);
if (ifap != NULL) if (ifap != NULL)
*ifap = &ifas[0].ifa; *ifap = &ifas[0].ifa;
return 0; exit_free:
free_netlink_handle (&nh);
exit_close:
netlink_close (&nh);
return result;
} }