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-rw-r--r--erts/emulator/drivers/common/inet_drv.c83
1 files changed, 74 insertions, 9 deletions
diff --git a/erts/emulator/drivers/common/inet_drv.c b/erts/emulator/drivers/common/inet_drv.c
index c13ceb14ad..3195ca3874 100644
--- a/erts/emulator/drivers/common/inet_drv.c
+++ b/erts/emulator/drivers/common/inet_drv.c
@@ -5185,6 +5185,71 @@ static int hwaddr_libdlpi_lookup(const char *ifnm,
}
#endif
+#ifdef HAVE_GETIFADDRS
+/* Returns 0 for success and errno() for failure */
+static int call_getifaddrs(inet_descriptor* desc_p, struct ifaddrs **ifa_pp)
+{
+ int result, save_errno;
+#ifdef HAVE_SETNS
+ int current_ns;
+
+ current_ns = 0;
+ if (desc_p->netns != NULL) {
+ int new_ns;
+ /* Temporarily change network namespace for this thread
+ * over the getifaddrs() call
+ */
+ current_ns = open("/proc/self/ns/net", O_RDONLY);
+ if (current_ns == INVALID_SOCKET)
+ return sock_errno();
+ new_ns = open(desc_p->netns, O_RDONLY);
+ if (new_ns == INVALID_SOCKET) {
+ save_errno = sock_errno();
+ while (close(current_ns) == INVALID_SOCKET &&
+ sock_errno() == EINTR);
+ return save_errno;
+ }
+ if (setns(new_ns, CLONE_NEWNET) != 0) {
+ save_errno = sock_errno();
+ while (close(new_ns) == INVALID_SOCKET &&
+ sock_errno() == EINTR);
+ while (close(current_ns) == INVALID_SOCKET &&
+ sock_errno() == EINTR);
+ return save_errno;
+ }
+ else {
+ while (close(new_ns) == INVALID_SOCKET &&
+ sock_errno() == EINTR);
+ }
+ }
+#endif
+ save_errno = 0;
+ result = getifaddrs(ifa_pp);
+ if (result < 0)
+ save_errno = sock_errno();
+#ifdef HAVE_SETNS
+ if (desc_p->netns != NULL) {
+ /* Restore network namespace */
+ if (setns(current_ns, CLONE_NEWNET) != 0) {
+ /* XXX Failed to restore network namespace.
+ * What to do? Tidy up and return an error...
+ * Note that the thread now might still be in the set namespace.
+ * Can this even happen? Should the emulator be aborted?
+ */
+ if (result >= 0) {
+ /* We got a result but have to waste it */
+ save_errno = sock_errno();
+ freeifaddrs(*ifa_pp);
+ }
+ }
+ while (close(current_ns) == INVALID_SOCKET &&
+ sock_errno() == EINTR);
+ }
+#endif
+ return save_errno;
+}
+#endif /* #ifdef HAVE_GETIFADDRS */
+
/* FIXME: temporary hack */
#ifndef IFHWADDRLEN
#define IFHWADDRLEN 6
@@ -5262,8 +5327,8 @@ static ErlDrvSSizeT inet_ctl_ifget(inet_descriptor* desc,
struct sockaddr_dl *sdlp;
int found = 0;
- if (getifaddrs(&ifa) == -1)
- goto error;
+ if (call_getifaddrs(desc, &ifa) != 0)
+ goto error;
for (ifp = ifa; ifp; ifp = ifp->ifa_next) {
if ((ifp->ifa_addr->sa_family == AF_LINK) &&
@@ -5981,6 +6046,7 @@ static ErlDrvSSizeT inet_ctl_getifaddrs(inet_descriptor* desc_p,
ErlDrvSizeT buf_size;
char *buf_p;
char *buf_alloc_p;
+ int save_errno;
buf_size = GETIFADDRS_BUFSZ;
buf_alloc_p = ALLOC(GETIFADDRS_BUFSZ);
@@ -6015,9 +6081,9 @@ static ErlDrvSSizeT inet_ctl_getifaddrs(inet_descriptor* desc_p,
} \
} while (0)
- if (getifaddrs(&ifa_p) < 0) {
- return ctl_error(sock_errno(), rbuf_pp, rsize);
- }
+ if ((save_errno = call_getifaddrs(desc_p, &ifa_p)) != 0)
+ return ctl_error(save_errno, rbuf_pp, rsize);
+
ifa_free_p = ifa_p;
*buf_p++ = INET_REP_OK;
for (; ifa_p; ifa_p = ifa_p->ifa_next) {
@@ -7869,8 +7935,8 @@ static ErlDrvSSizeT inet_fill_opts(inet_descriptor* desc,
* cmsg options and values
*/
PLACE_FOR(1+4, ptr);
- *ptr = opt;
- arg_ptr = ptr+1; /* Where to put total length */
+ *ptr++ = opt;
+ arg_ptr = ptr; /* Where to put total length */
arg_sz = 0; /* Total length */
for (cmsg_top = (struct cmsghdr*)(cmsgbuf.buf + cmsg_sz),
cmsg = (struct cmsghdr*)cmsgbuf.buf;
@@ -7882,7 +7948,6 @@ static ErlDrvSSizeT inet_fill_opts(inet_descriptor* desc,
PLACE_FOR(1+4, ptr); \
*ptr++ = OPT; \
put_cmsg_int32(cmsg, ptr); \
- ptr += 4; \
arg_sz += 1+4; \
continue; \
}
@@ -7896,7 +7961,6 @@ static ErlDrvSSizeT inet_fill_opts(inet_descriptor* desc,
PUT_CMSG_INT32(IPPROTO_IP, IP_TTL, INET_OPT_TTL);
#endif
/* BSD uses the RECV* names in CMSG fields */
- }
#if defined(IPPROTO_IP) && defined(IP_RECVTOS)
PUT_CMSG_INT32(IPPROTO_IP, IP_RECVTOS, INET_OPT_TOS);
#endif
@@ -7907,6 +7971,7 @@ static ErlDrvSSizeT inet_fill_opts(inet_descriptor* desc,
PUT_CMSG_INT32(IPPROTO_IP, IP_RECVTTL, INET_OPT_TTL);
#endif
#undef PUT_CMSG_INT32
+ }
put_int32(arg_sz, arg_ptr); /* Put total length */
continue;
}