add REMOTE_ADDR and REMOTE_PORT for Accept=yes

TODO

@@ -171,8 +171,6 @@ Features:
 * as soon as we have kdbus, and sender timestamps, revisit coalescing multiple parallel daemon reloads:
   http://lists.freedesktop.org/archives/systemd-devel/2014-December/025862.html
 
-* set $REMOTE_IP (or $REMOTE_ADDR/$REMOTE_PORT) environment variable when doing per-connection socket activation. use format introduced by xinetd or CGI for this
-
 * the install state probably shouldn't get confused by generated units, think dbus1/kdbus compat!
 
 * in systemctl list-unit-files: show the install value the presets would suggest for a service in a third column

man/systemd.socket.xml

@@ -357,7 +357,12 @@
         daemons designed for usage with
         <citerefentry><refentrytitle>inetd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
         to work unmodified with systemd socket
-        activation.</para></listitem>
+        activation.</para>
+
+        <para>For IPv4 and IPv6 connections the <varname>REMOTE_ADDR</varname>
+        environment variable will contain the remote IP, and <varname>REMOTE_PORT</varname>
+        will contain the remote port. This is the same as the format used by CGI.
+        For SOCK_RAW the port is the IP protocol.</para></listitem>
       </varlistentry>
 
       <varlistentry>

src/core/service.c

@@ -1095,7 +1095,7 @@ static int service_spawn(
         if (r < 0)
                 goto fail;
 
-        our_env = new0(char*, 4);
+        our_env = new0(char*, 6);
         if (!our_env) {
                 r = -ENOMEM;
                 goto fail;
@@ -1119,6 +1119,46 @@ static int service_spawn(
                         goto fail;
                 }
 
+        if (UNIT_DEREF(s->accept_socket)) {
+                union sockaddr_union sa;
+                socklen_t salen = sizeof(sa);
+
+                r = getpeername(s->socket_fd, &sa.sa, &salen);
+                if (r < 0) {
+                        r = -errno;
+                        goto fail;
+                }
+
+                if (IN_SET(sa.sa.sa_family, AF_INET, AF_INET6)) {
+                        _cleanup_free_ char *addr = NULL;
+                        char *t;
+                        int port;
+
+                        r = sockaddr_pretty(&sa.sa, salen, true, false, &addr);
+                        if (r < 0)
+                                goto fail;
+
+                        t = strappend("REMOTE_ADDR=", addr);
+                        if (!t) {
+                                r = -ENOMEM;
+                                goto fail;
+                        }
+                        our_env[n_env++] = t;
+
+                        port = sockaddr_port(&sa.sa);
+                        if (port < 0) {
+                                r = port;
+                                goto fail;
+                        }
+
+                        if (asprintf(&t, "REMOTE_PORT=%u", port) < 0) {
+                                r = -ENOMEM;
+                                goto fail;
+                        }
+                        our_env[n_env++] = t;
+                }
+        }
+
         final_env = strv_env_merge(2, UNIT(s)->manager->environment, our_env, NULL);
         if (!final_env) {
                 r = -ENOMEM;

src/libsystemd/sd-resolve/test-resolve.c

@@ -46,7 +46,7 @@ static int getaddrinfo_handler(sd_resolve_query *q, int ret, const struct addrin
         for (i = ai; i; i = i->ai_next) {
                 _cleanup_free_ char *addr = NULL;
 
-                assert_se(sockaddr_pretty(i->ai_addr, i->ai_addrlen, false, &addr) == 0);
+                assert_se(sockaddr_pretty(i->ai_addr, i->ai_addrlen, false, true, &addr) == 0);
                 puts(addr);
         }
 

src/shared/socket-util.c

@@ -297,7 +297,7 @@ int socket_address_print(const SocketAddress *a, char **ret) {
                 return 0;
         }
 
-        return sockaddr_pretty(&a->sockaddr.sa, a->size, false, ret);
+        return sockaddr_pretty(&a->sockaddr.sa, a->size, false, true, ret);
 }
 
 bool socket_address_can_accept(const SocketAddress *a) {
@@ -466,7 +466,20 @@ bool socket_address_matches_fd(const SocketAddress *a, int fd) {
         return socket_address_equal(a, &b);
 }
 
-int sockaddr_pretty(const struct sockaddr *_sa, socklen_t salen, bool translate_ipv6, char **ret) {
+int sockaddr_port(const struct sockaddr *_sa) {
+        union sockaddr_union *sa = (union sockaddr_union*) _sa;
+
+        assert(sa);
+
+        if (!IN_SET(sa->sa.sa_family, AF_INET, AF_INET6))
+                return -EAFNOSUPPORT;
+
+        return ntohs(sa->sa.sa_family == AF_INET6 ?
+                       sa->in6.sin6_port :
+                       sa->in.sin_port);
+}
+
+int sockaddr_pretty(const struct sockaddr *_sa, socklen_t salen, bool translate_ipv6, bool include_port, char **ret) {
         union sockaddr_union *sa = (union sockaddr_union*) _sa;
         char *p;
 
@@ -480,11 +493,18 @@ int sockaddr_pretty(const struct sockaddr *_sa, socklen_t salen, bool translate_
 
                 a = ntohl(sa->in.sin_addr.s_addr);
 
-                if (asprintf(&p,
+                if (include_port) {
-                             "%u.%u.%u.%u:%u",
+                        if (asprintf(&p,
-                             a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
+                                     "%u.%u.%u.%u:%u",
-                             ntohs(sa->in.sin_port)) < 0)
+                                     a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
-                        return -ENOMEM;
+                                     ntohs(sa->in.sin_port)) < 0)
+                                return -ENOMEM;
+                } else {
+                        if (asprintf(&p,
+                                     "%u.%u.%u.%u",
+                                     a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF) < 0)
+                                return -ENOMEM;
+                }
 
                 break;
         }
@@ -496,20 +516,34 @@ int sockaddr_pretty(const struct sockaddr *_sa, socklen_t salen, bool translate_
 
                 if (translate_ipv6 && memcmp(&sa->in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
                         const uint8_t *a = sa->in6.sin6_addr.s6_addr+12;
-
+                        if (include_port) {
-                        if (asprintf(&p,
+                                if (asprintf(&p,
-                                     "%u.%u.%u.%u:%u",
+                                             "%u.%u.%u.%u:%u",
-                                     a[0], a[1], a[2], a[3],
+                                             a[0], a[1], a[2], a[3],
-                                     ntohs(sa->in6.sin6_port)) < 0)
+                                             ntohs(sa->in6.sin6_port)) < 0)
-                                return -ENOMEM;
+                                        return -ENOMEM;
+                        } else {
+                                if (asprintf(&p,
+                                             "%u.%u.%u.%u",
+                                             a[0], a[1], a[2], a[3]) < 0)
+                                        return -ENOMEM;
+                        }
                 } else {
                         char a[INET6_ADDRSTRLEN];
 
-                        if (asprintf(&p,
+                        inet_ntop(AF_INET6, &sa->in6.sin6_addr, a, sizeof(a));
-                                     "[%s]:%u",
+
-                                     inet_ntop(AF_INET6, &sa->in6.sin6_addr, a, sizeof(a)),
+                        if (include_port) {
-                                     ntohs(sa->in6.sin6_port)) < 0)
+                                if (asprintf(&p,
-                                return -ENOMEM;
+                                             "[%s]:%u",
+                                             a,
+                                             ntohs(sa->in6.sin6_port)) < 0)
+                                        return -ENOMEM;
+                        } else {
+                                p = strdup(a);
+                                if (!p)
+                                        return -ENOMEM;
+                        }
                 }
 
                 break;
@@ -584,7 +618,7 @@ int getpeername_pretty(int fd, char **ret) {
         /* For remote sockets we translate IPv6 addresses back to IPv4
          * if applicable, since that's nicer. */
 
-        return sockaddr_pretty(&sa.sa, salen, true, ret);
+        return sockaddr_pretty(&sa.sa, salen, true, true, ret);
 }
 
 int getsockname_pretty(int fd, char **ret) {
@@ -602,7 +636,7 @@ int getsockname_pretty(int fd, char **ret) {
          * listening sockets where the difference between IPv4 and
          * IPv6 matters. */
 
-        return sockaddr_pretty(&sa.sa, salen, false, ret);
+        return sockaddr_pretty(&sa.sa, salen, false, true, ret);
 }
 
 int socknameinfo_pretty(union sockaddr_union *sa, socklen_t salen, char **_ret) {
@@ -616,7 +650,7 @@ int socknameinfo_pretty(union sockaddr_union *sa, socklen_t salen, char **_ret)
         if (r != 0) {
                 int saved_errno = errno;
 
-                r = sockaddr_pretty(&sa->sa, salen, true, &ret);
+                r = sockaddr_pretty(&sa->sa, salen, true, true, &ret);
                 if (r < 0)
                         return log_error_errno(r, "sockadd_pretty() failed: %m");
 

src/shared/socket-util.h

@@ -97,7 +97,9 @@ const char* socket_address_get_path(const SocketAddress *a);
 
 bool socket_ipv6_is_supported(void);
 
-int sockaddr_pretty(const struct sockaddr *_sa, socklen_t salen, bool translate_ipv6, char **ret);
+int sockaddr_port(const struct sockaddr *_sa) _pure_;
+
+int sockaddr_pretty(const struct sockaddr *_sa, socklen_t salen, bool translate_ipv6, bool include_port, char **ret);
 int getpeername_pretty(int fd, char **ret);
 int getsockname_pretty(int fd, char **ret);
 

src/timesync/timesyncd-server.h

@@ -59,7 +59,7 @@ struct ServerName {
 int server_address_new(ServerName *n, ServerAddress **ret, const union sockaddr_union *sockaddr, socklen_t socklen);
 ServerAddress* server_address_free(ServerAddress *a);
 static inline int server_address_pretty(ServerAddress *a, char **pretty) {
-        return sockaddr_pretty(&a->sockaddr.sa, a->socklen, true, pretty);
+        return sockaddr_pretty(&a->sockaddr.sa, a->socklen, true, true, pretty);
 }
 
 int server_name_new(Manager *m, ServerName **ret, ServerType type,const char *string);