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authorLennart Poettering <lennart@poettering.net>2010-05-09 18:02:38 +0200
committerLennart Poettering <lennart@poettering.net>2010-05-09 18:02:38 +0200
commitaf5bc85dc1297079edc9890861aaa38de0ec30df (patch)
tree5a96f14d59eed59090f16826d84f4f9f1e501633
parentf2b4af1cd4112df6ce56f8fc1e677639935e3d0e (diff)
loopback: configure lo device on bootup
-rw-r--r--.gitignore1
-rw-r--r--Makefile.am13
-rw-r--r--loopback-setup.c276
-rw-r--r--loopback-setup.h27
-rw-r--r--main.c5
-rw-r--r--test-loopback.c35
6 files changed, 355 insertions, 2 deletions
diff --git a/.gitignore b/.gitignore
index d2ce04d301..b9cb51c0e7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
*~
test-ns
+test-loopback
systemd-initctl.service
systemd-logger.service
systemd-cgroups-agent
diff --git a/Makefile.am b/Makefile.am
index c98ad0b8b9..c38c7d575c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -53,7 +53,8 @@ pkglibexec_PROGRAMS = \
noinst_PROGRAMS = \
test-engine \
test-job-type \
- test-ns
+ test-ns \
+ test-loopback
dbuspolicy_DATA = \
org.freedesktop.systemd1.conf
@@ -155,6 +156,8 @@ COMMON_SOURCES = \
mount-setup.h \
hostname-setup.c \
hostname-setup.h \
+ loopback-setup.c \
+ loopback-setup.h \
utmp-wtmp.c \
utmp-wtmp.h \
specifier.c \
@@ -203,6 +206,14 @@ test_ns_SOURCES = \
test_ns_CPPFLAGS = $(systemd_CPPFLAGS)
test_ns_LDADD = $(systemd_LDADD)
+test_loopback_SOURCES = \
+ $(BASIC_SOURCES) \
+ test-loopback.c \
+ loopback-setup.c
+
+test_loopback_CPPFLAGS = $(systemd_CPPFLAGS)
+test_loopback_LDADD = $(systemd_LDADD)
+
systemd_logger_SOURCES = \
$(BASIC_SOURCES) \
logger.c
diff --git a/loopback-setup.c b/loopback-setup.c
new file mode 100644
index 0000000000..e37bf4190b
--- /dev/null
+++ b/loopback-setup.c
@@ -0,0 +1,276 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <asm/types.h>
+#include <netinet/in.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+
+#include "util.h"
+#include "macro.h"
+#include "loopback-setup.h"
+
+enum {
+ REQUEST_NONE = 0,
+ REQUEST_ADDRESS_IPV4 = 1,
+ REQUEST_ADDRESS_IPV6 = 2,
+ REQUEST_FLAGS = 4,
+ REQUEST_ALL = 7
+};
+
+#define NLMSG_TAIL(nmsg) \
+ ((struct rtattr *) (((uint8_t*) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
+
+static int add_rtattr(struct nlmsghdr *n, size_t max_length, int type, const void *data, size_t data_length) {
+ size_t length;
+ struct rtattr *rta;
+
+ length = RTA_LENGTH(data_length);
+
+ if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(length) > max_length)
+ return -E2BIG;
+
+ rta = NLMSG_TAIL(n);
+ rta->rta_type = type;
+ rta->rta_len = length;
+ memcpy(RTA_DATA(rta), data, data_length);
+ n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(length);
+
+ return 0;
+}
+
+static ssize_t sendto_loop(int fd, const void *buf, size_t buf_len, int flags, const struct sockaddr *sa, socklen_t sa_len) {
+
+ for (;;) {
+ ssize_t l;
+
+ if ((l = sendto(fd, buf, buf_len, flags, sa, sa_len)) >= 0)
+ return l;
+
+ if (errno != EINTR)
+ return -errno;
+ }
+}
+
+static ssize_t recvfrom_loop(int fd, void *buf, size_t buf_len, int flags, struct sockaddr *sa, socklen_t *sa_len) {
+
+ for (;;) {
+ ssize_t l;
+
+ if ((l = recvfrom(fd, buf, buf_len, flags, sa, sa_len)) >= 0)
+ return l;
+
+ if (errno != EINTR)
+ return -errno;
+ }
+}
+
+static int add_adresses(int fd, int if_loopback) {
+ union {
+ struct sockaddr sa;
+ struct sockaddr_nl nl;
+ } sa;
+ union {
+ struct nlmsghdr header;
+ uint8_t buf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
+ NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
+ RTA_LENGTH(sizeof(struct in6_addr))];
+ } request;
+
+ struct ifaddrmsg *ifaddrmsg;
+ uint32_t ipv4_address = htonl(INADDR_LOOPBACK);
+ int r;
+
+ zero(request);
+
+ request.header.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
+ request.header.nlmsg_type = RTM_NEWADDR;
+ request.header.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_ACK;
+ request.header.nlmsg_seq = REQUEST_ADDRESS_IPV4;
+
+ ifaddrmsg = NLMSG_DATA(&request.header);
+ ifaddrmsg->ifa_family = AF_INET;
+ ifaddrmsg->ifa_prefixlen = 8;
+ ifaddrmsg->ifa_flags = IFA_F_PERMANENT;
+ ifaddrmsg->ifa_scope = RT_SCOPE_HOST;
+ ifaddrmsg->ifa_index = if_loopback;
+
+ if ((r = add_rtattr(&request.header, sizeof(request), IFA_LOCAL, &ipv4_address, sizeof(ipv4_address))) < 0)
+ return r;
+
+ zero(sa);
+ sa.nl.nl_family = AF_NETLINK;
+
+ if (sendto_loop(fd, &request, request.header.nlmsg_len, 0, &sa.sa, sizeof(sa)) < 0)
+ return -errno;
+
+ request.header.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
+ request.header.nlmsg_seq = REQUEST_ADDRESS_IPV6;
+
+ ifaddrmsg->ifa_family = AF_INET6;
+ ifaddrmsg->ifa_prefixlen = 128;
+
+ if ((r = add_rtattr(&request.header, sizeof(request), IFA_LOCAL, &in6addr_loopback, sizeof(in6addr_loopback))) < 0)
+ return r;
+
+ if (sendto_loop(fd, &request, request.header.nlmsg_len, 0, &sa.sa, sizeof(sa)) < 0)
+ return -errno;
+
+ return 0;
+}
+
+static int start_interface(int fd, int if_loopback) {
+ union {
+ struct sockaddr sa;
+ struct sockaddr_nl nl;
+ } sa;
+ union {
+ struct nlmsghdr header;
+ uint8_t buf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
+ NLMSG_ALIGN(sizeof(struct ifinfomsg))];
+ } request;
+
+ struct ifinfomsg *ifinfomsg;
+
+ zero(request);
+
+ request.header.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+ request.header.nlmsg_type = RTM_NEWLINK;
+ request.header.nlmsg_flags = NLM_F_REQUEST|NLM_F_ACK;
+ request.header.nlmsg_seq = REQUEST_FLAGS;
+
+ ifinfomsg = NLMSG_DATA(&request.header);
+ ifinfomsg->ifi_family = AF_UNSPEC;
+ ifinfomsg->ifi_index = if_loopback;
+ ifinfomsg->ifi_flags = IFF_UP;
+ ifinfomsg->ifi_change = IFF_UP;
+
+ zero(sa);
+ sa.nl.nl_family = AF_NETLINK;
+
+ if (sendto_loop(fd, &request, request.header.nlmsg_len, 0, &sa.sa, sizeof(sa)) < 0)
+ return -errno;
+
+ return 0;
+}
+
+static int read_response(int fd) {
+ union {
+ struct sockaddr sa;
+ struct sockaddr_nl nl;
+ } sa;
+ union {
+ struct nlmsghdr header;
+ uint8_t buf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
+ NLMSG_ALIGN(sizeof(struct nlmsgerr))];
+ } response;
+
+ ssize_t l;
+ socklen_t sa_len = sizeof(sa);
+ struct nlmsgerr *nlmsgerr;
+
+ if ((l = recvfrom_loop(fd, &response, sizeof(response), 0, &sa.sa, &sa_len)) < 0)
+ return -errno;
+
+ if (sa_len != sizeof(sa.nl) ||
+ sa.nl.nl_family != AF_NETLINK)
+ return -EIO;
+
+ if (sa.nl.nl_pid != 0)
+ return 0;
+
+ if ((size_t) l < sizeof(struct nlmsghdr))
+ return -EIO;
+
+ if (response.header.nlmsg_type != NLMSG_ERROR ||
+ (pid_t) response.header.nlmsg_pid != getpid() ||
+ response.header.nlmsg_seq >= REQUEST_ALL)
+ return 0;
+
+ if ((size_t) l < NLMSG_LENGTH(sizeof(struct nlmsgerr)) ||
+ response.header.nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
+ return -EIO;
+
+ nlmsgerr = NLMSG_DATA(&response.header);
+
+ if (nlmsgerr->error < 0 && nlmsgerr->error != -EEXIST)
+ return nlmsgerr->error;
+
+ return response.header.nlmsg_seq;
+}
+
+int loopback_setup(void) {
+ int r, if_loopback;
+ union {
+ struct sockaddr sa;
+ struct sockaddr_nl nl;
+ struct sockaddr_storage storage;
+ } sa;
+ int requests = REQUEST_NONE;
+
+ int fd;
+
+ errno = 0;
+ if ((if_loopback = (int) if_nametoindex("lo")) <= 0)
+ return errno ? -errno : -ENODEV;
+
+ if ((fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) < 0)
+ return -errno;
+
+ zero(sa);
+ sa.nl.nl_family = AF_NETLINK;
+
+ if (bind(fd, &sa.sa, sizeof(sa)) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ if ((r = add_adresses(fd, if_loopback)) < 0)
+ goto finish;
+
+ if ((r = start_interface(fd, if_loopback)) < 0)
+ goto finish;
+
+ do {
+ if ((r = read_response(fd)) < 0)
+ goto finish;
+
+ requests |= r;
+
+ } while (requests != REQUEST_ALL);
+
+ r = 0;
+
+finish:
+ if (r < 0)
+ log_error("Failed to configure loopback device: %s", strerror(-r));
+
+ if (fd >= 0)
+ close_nointr_nofail(fd);
+
+ return r;
+}
diff --git a/loopback-setup.h b/loopback-setup.h
new file mode 100644
index 0000000000..b4614fa5bd
--- /dev/null
+++ b/loopback-setup.h
@@ -0,0 +1,27 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+#ifndef fooloopbacksetuphfoo
+#define fooloopbacksetuphfoo
+
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+int loopback_setup(void);
+
+#endif
diff --git a/main.c b/main.c
index 0128787d14..aa58040ff5 100644
--- a/main.c
+++ b/main.c
@@ -36,6 +36,7 @@
#include "log.h"
#include "mount-setup.h"
#include "hostname-setup.h"
+#include "loopback-setup.h"
#include "load-fragment.h"
#include "fdset.h"
@@ -641,8 +642,10 @@ int main(int argc, char *argv[]) {
log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
- if (running_as == MANAGER_INIT)
+ if (running_as == MANAGER_INIT) {
hostname_setup();
+ loopback_setup();
+ }
if ((r = manager_new(running_as, confirm_spawn, &m)) < 0) {
log_error("Failed to allocate manager object: %s", strerror(-r));
diff --git a/test-loopback.c b/test-loopback.c
new file mode 100644
index 0000000000..5cd7b41e19
--- /dev/null
+++ b/test-loopback.c
@@ -0,0 +1,35 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "loopback-setup.h"
+
+int main(int argc, char* argv[]) {
+ int r;
+
+ if ((r = loopback_setup()) < 0)
+ fprintf(stderr, "loopback: %s\n", strerror(-r));
+
+ return 0;
+}