nss-myhostname: move local address listing logic into shared, so that we can make use of it from machined

5 files changed, 45 insertions, 39 deletions

diff --git a/Makefile.am b/Makefile.am
index b28fa3feb..50e31dbe2 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -2320,6 +2320,8 @@ libsystemd_internal_la_SOURCES = \
 	src/libsystemd/sd-rtnl/rtnl-types.c \
 	src/libsystemd/sd-rtnl/rtnl-util.h \
 	src/libsystemd/sd-rtnl/rtnl-util.c \
+	src/libsystemd/sd-rtnl/local-addresses.h \
+	src/libsystemd/sd-rtnl/local-addresses.c \
 	src/libsystemd/sd-id128/sd-id128.c \
 	src/libsystemd/sd-daemon/sd-daemon.c \
 	src/libsystemd/sd-login/sd-login.c \
@@ -4398,9 +4400,7 @@ endif
 if HAVE_MYHOSTNAME
 libnss_myhostname_la_SOURCES = \
 	src/nss-myhostname/nss-myhostname.sym \
-	src/nss-myhostname/nss-myhostname.c \
-	src/nss-myhostname/addresses.h \
-	src/nss-myhostname/addresses.c
+	src/nss-myhostname/nss-myhostname.c
 
 libnss_myhostname_la_LDFLAGS = \
 	$(AM_LDFLAGS) \
diff --git a/src/nss-myhostname/addresses.c b/src/libsystemd/sd-rtnl/local-addresses.c
index d75e85049..dd5ccedc9 100644
--- a/src/nss-myhostname/addresses.c
+++ b/src/libsystemd/sd-rtnl/local-addresses.c
@@ -23,10 +23,10 @@
 #include "sd-rtnl.h"
 #include "rtnl-util.h"
 #include "macro.h"
-#include "addresses.h"
+#include "local-addresses.h"
 
 static int address_compare(const void *_a, const void *_b) {
-        const struct address *a = _a, *b = _b;
+        const struct local_address *a = _a, *b = _b;
 
         /* Order lowest scope first, IPv4 before IPv6, lowest interface index first */
 
@@ -48,14 +48,16 @@ static int address_compare(const void *_a, const void *_b) {
         return 0;
 }
 
-int acquire_addresses(struct address **_list, unsigned *_n_list) {
+int local_addresses(struct local_address **ret) {
         _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
         _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
-        _cleanup_free_ struct address *list = NULL;
+        _cleanup_free_ struct local_address *list = NULL;
         size_t n_list = 0, n_allocated = 0;
         sd_rtnl_message *m;
         int r;
 
+        assert(ret);
+
         r = sd_rtnl_open(&rtnl, 0);
         if (r < 0)
                 return r;
@@ -69,7 +71,7 @@ int acquire_addresses(struct address **_list, unsigned *_n_list) {
                 return r;
 
         for (m = reply; m; m = sd_rtnl_message_next(m)) {
-                struct address *a;
+                struct local_address *a;
                 unsigned char flags;
                 uint16_t type;
 
@@ -139,11 +141,10 @@ int acquire_addresses(struct address **_list, unsigned *_n_list) {
         };
 
         if (n_list)
-                qsort(list, n_list, sizeof(struct address), address_compare);
+                qsort(list, n_list, sizeof(struct local_address), address_compare);
 
-        *_list = list;
+        *ret = list;
         list = NULL;
-        *_n_list = n_list;
 
-        return 0;
+        return (int) n_list;
 }
diff --git a/src/nss-myhostname/addresses.h b/src/libsystemd/sd-rtnl/local-addresses.h
index 1bfb3579d..cc26fc479 100644
--- a/src/nss-myhostname/addresses.h
+++ b/src/libsystemd/sd-rtnl/local-addresses.h
@@ -28,16 +28,10 @@
 
 #include "socket-util.h"
 
-struct address {
+struct local_address {
+        int ifindex;
         unsigned char family, scope;
         union in_addr_union address;
-        int ifindex;
 };
 
-static inline size_t PROTO_ADDRESS_SIZE(int proto) {
-        assert(proto == AF_INET || proto == AF_INET6);
-
-        return proto == AF_INET6 ? 16 : 4;
-}
-
-int acquire_addresses(struct address **_list, unsigned *_n_list);
+int local_addresses(struct local_address **ret);
diff --git a/src/nss-myhostname/nss-myhostname.c b/src/nss-myhostname/nss-myhostname.c
index 6551ac9f3..15a35f302 100644
--- a/src/nss-myhostname/nss-myhostname.c
+++ b/src/nss-myhostname/nss-myhostname.c
@@ -30,7 +30,7 @@
 #include <stdlib.h>
 #include <arpa/inet.h>
 
-#include "addresses.h"
+#include "local-addresses.h"
 #include "macro.h"
 
 /* Ensure that glibc's assert is used. We cannot use assert from macro.h, as
@@ -99,15 +99,15 @@ enum nss_status _nss_myhostname_gethostbyname4_r(
                 int32_t *ttlp) {
 
         struct gaih_addrtuple *r_tuple, *r_tuple_prev = NULL;
-        _cleanup_free_ struct address *addresses = NULL;
+        _cleanup_free_ struct local_address *addresses = NULL;
         _cleanup_free_ char *hn = NULL;
         const char *canonical = NULL;
-        unsigned n_addresses = 0, n;
+        int n_addresses = 0, lo_ifi;
         uint32_t local_address_ipv4;
-        struct address *a;
+        struct local_address *a;
         size_t l, idx, ms;
         char *r_name;
-        int lo_ifi;
+        unsigned n;
 
         assert(name);
         assert(pat);
@@ -136,8 +136,9 @@ enum nss_status _nss_myhostname_gethostbyname4_r(
                         return NSS_STATUS_NOTFOUND;
                 }
 
-                /* If this fails, n_addresses is 0. Which is fine */
-                acquire_addresses(&addresses, &n_addresses);
+                n_addresses = local_addresses(&addresses);
+                if (n_addresses < 0)
+                        n_addresses = 0;
 
                 canonical = hn;
                 local_address_ipv4 = LOCALADDRESS_IPV4;
@@ -184,7 +185,7 @@ enum nss_status _nss_myhostname_gethostbyname4_r(
         }
 
         /* Fourth, fill actual addresses in, but in backwards order */
-        for (a = addresses + n_addresses - 1, n = 0; n < n_addresses; n++, a--) {
+        for (a = addresses + n_addresses - 1, n = 0; (int) n < n_addresses; n++, a--) {
                 r_tuple = (struct gaih_addrtuple*) (buffer + idx);
                 r_tuple->next = r_tuple_prev;
                 r_tuple->name = r_name;
@@ -214,7 +215,7 @@ enum nss_status _nss_myhostname_gethostbyname4_r(
 static enum nss_status fill_in_hostent(
                 const char *canonical, const char *additional,
                 int af,
-                struct address *addresses, unsigned n_addresses,
+                struct local_address *addresses, unsigned n_addresses,
                 uint32_t local_address_ipv4,
                 struct hostent *result,
                 char *buffer, size_t buflen,
@@ -225,7 +226,7 @@ static enum nss_status fill_in_hostent(
         size_t l_canonical, l_additional, idx, ms;
         char *r_addr, *r_name, *r_aliases, *r_alias = NULL, *r_addr_list;
         size_t alen;
-        struct address *a;
+        struct local_address *a;
         unsigned n, c;
 
         assert(canonical);
@@ -351,11 +352,11 @@ enum nss_status _nss_myhostname_gethostbyname3_r(
                 int32_t *ttlp,
                 char **canonp) {
 
-        _cleanup_free_ struct address *addresses = NULL;
+        _cleanup_free_ struct local_address *addresses = NULL;
         const char *canonical, *additional = NULL;
         _cleanup_free_ char *hn = NULL;
         uint32_t local_address_ipv4;
-        unsigned n_addresses = 0;
+        int n_addresses = 0;
 
         assert(name);
         assert(host);
@@ -389,7 +390,9 @@ enum nss_status _nss_myhostname_gethostbyname3_r(
                         return NSS_STATUS_NOTFOUND;
                 }
 
-                acquire_addresses(&addresses, &n_addresses);
+                n_addresses = local_addresses(&addresses);
+                if (n_addresses < 0)
+                        n_addresses = 0;
 
                 canonical = hn;
                 additional = n_addresses <= 0 && af == AF_INET6 ? "localhost" : NULL;
@@ -451,10 +454,11 @@ enum nss_status _nss_myhostname_gethostbyaddr2_r(
 
         const char *canonical = NULL, *additional = NULL;
         uint32_t local_address_ipv4 = LOCALADDRESS_IPV4;
-        _cleanup_free_ struct address *addresses = NULL;
+        _cleanup_free_ struct local_address *addresses = NULL;
         _cleanup_free_ char *hn = NULL;
-        unsigned n_addresses = 0, n;
-        struct address *a;
+        int n_addresses = 0;
+        struct local_address *a;
+        unsigned n;
 
         assert(addr);
         assert(host);
@@ -492,9 +496,11 @@ enum nss_status _nss_myhostname_gethostbyaddr2_r(
                 return NSS_STATUS_UNAVAIL;
         }
 
-        acquire_addresses(&addresses, &n_addresses);
+        n_addresses = local_addresses(&addresses);
+        if (n_addresses < 0)
+                n_addresses = 0;
 
-        for (a = addresses, n = 0; n < n_addresses; n++, a++) {
+        for (a = addresses, n = 0; (int) n < n_addresses; n++, a++) {
                 if (af != a->family)
                         continue;
 
diff --git a/src/shared/socket-util.h b/src/shared/socket-util.h
index 25c4a7e4f..8d521ae1a 100644
--- a/src/shared/socket-util.h
+++ b/src/shared/socket-util.h
@@ -118,3 +118,8 @@ int in_addr_prefix_intersect(unsigned family, const union in_addr_union *a, unsi
 int in_addr_prefix_next(unsigned family, union in_addr_union *u, unsigned prefixlen);
 int in_addr_to_string(unsigned family, const union in_addr_union *u, char **ret);
 int in_addr_from_string(unsigned family, const char *s, union in_addr_union *ret);
+
+static inline size_t PROTO_ADDRESS_SIZE(int proto) {
+        assert(proto == AF_INET || proto == AF_INET6);
+        return proto == AF_INET6 ? 16 : 4;
+}