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-rw-r--r--src/include/bcnm/bcnm.h16
-rw-r--r--src/include/bcnm/if.h22
-rw-r--r--src/libbcnm/bcnm_if_getstate.c30
-rw-r--r--src/libbcnm/bcnm_if_link_event.c77
-rw-r--r--src/libbcnm/bcnm_if_link_init.c38
-rw-r--r--src/libbcnm/deps-lib/bcnm3
-rw-r--r--src/utils/bcnm-waitif.c91
7 files changed, 277 insertions, 0 deletions
diff --git a/src/include/bcnm/bcnm.h b/src/include/bcnm/bcnm.h
new file mode 100644
index 0000000..f3d5bf2
--- /dev/null
+++ b/src/include/bcnm/bcnm.h
@@ -0,0 +1,16 @@
+/* ISC license. */
+
+#ifndef BCNM_BCNM_H
+#define BCNM_BCNM_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <bcnm/if.h>
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/src/include/bcnm/if.h b/src/include/bcnm/if.h
new file mode 100644
index 0000000..c4217ab
--- /dev/null
+++ b/src/include/bcnm/if.h
@@ -0,0 +1,22 @@
+/* ISC license. */
+
+#ifndef BCNM_IF_H
+#define BCNM_IF_H
+
+#include <sys/types.h>
+#include <net/if.h>
+
+typedef struct bcnm_if_link_state_s bcnm_if_link_state_t, *bcnm_if_link_state_t_ref ;
+struct bcnm_if_link_state_s
+{
+ char ifname[IF_NAMESIZE] ;
+ unsigned int state : 15 ;
+ unsigned int changed : 1 ;
+} ;
+#define BCNM_IF_LINK_STATE_ZERO { "", 0, 0 }
+
+extern int bcnm_if_getstate (char const *) ;
+extern int bcnm_if_link_init (unsigned int) ;
+extern ssize_t bcnm_if_link_event (int, bcnm_if_link_state_t *, size_t) ;
+
+#endif
diff --git a/src/libbcnm/bcnm_if_getstate.c b/src/libbcnm/bcnm_if_getstate.c
new file mode 100644
index 0000000..af50268
--- /dev/null
+++ b/src/libbcnm/bcnm_if_getstate.c
@@ -0,0 +1,30 @@
+/* ISC license. */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+
+#include <bcnm/if.h>
+
+int bcnm_if_getstate (char const *ifname)
+{
+ struct ifreq blah ;
+ int sfd ;
+ int e = errno ;
+ size_t len = strlen(ifname) ;
+ if (len >= IFNAMSIZ) return (errno = ENAMETOOLONG, -1) ;
+ memcpy(blah.ifr_name, ifname, len+1) ;
+ sfd = socket(AF_INET, SOCK_DGRAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0) ;
+ if (sfd < 0) return -1 ;
+ if (ioctl(sfd, SIOCGIFFLAGS, &blah) < 0)
+ return errno == ENODEV ? (errno = e, 0) : -1 ;
+ close(sfd) ;
+ return 1 | !!(blah.ifr_flags & IFF_UP) << 1 | !!(blah.ifr_flags & IFF_RUNNING) << 2 ;
+}
diff --git a/src/libbcnm/bcnm_if_link_event.c b/src/libbcnm/bcnm_if_link_event.c
new file mode 100644
index 0000000..fd7157a
--- /dev/null
+++ b/src/libbcnm/bcnm_if_link_event.c
@@ -0,0 +1,77 @@
+/* ISC license. */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <string.h>
+#include <errno.h>
+#include <net/if.h>
+#include <sys/socket.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+
+#include <bcnm/if.h>
+
+static inline ssize_t fd_recvmsg_nb (int fd, struct msghdr *hdr)
+{
+ int e = errno ;
+ ssize_t r ;
+ do r = recvmsg(fd, hdr, MSG_DONTWAIT) ;
+ while (r == -1 && errno == EINTR) ;
+ if (r == -1 && errno == EWOULDBLOCK) return (errno = e, 0) ;
+ if (!r) return (errno = EPIPE, -1) ;
+ return r ;
+}
+
+static int answer (bcnm_if_link_state_t *tab, size_t n, char const *ifname, unsigned int state)
+{
+ size_t i = 0 ;
+ for (; i < n ; i++) if (!strcmp(ifname, tab[i].ifname)) break ;
+ if (i >= n) return 0 ;
+ tab[i].state = state ;
+ tab[i].changed = 1 ;
+ return 1 ;
+}
+
+ssize_t bcnm_if_link_event (int fd, bcnm_if_link_state_t *tab, size_t n)
+{
+ ssize_t e = 0 ;
+ struct sockaddr_nl nl ;
+ struct nlmsghdr buf[8192 / sizeof(struct nlmsghdr)] ;
+ struct iovec v = { .iov_base = buf, .iov_len = sizeof(struct nlmsghdr) * (8192 / sizeof(struct nlmsghdr)) } ;
+ struct msghdr msg =
+ {
+ .msg_name = &nl,
+ .msg_namelen = sizeof(struct sockaddr_nl),
+ .msg_iov = &v,
+ .msg_iovlen = 1,
+ .msg_control = 0,
+ .msg_controllen = 0,
+ .msg_flags = 0
+ } ;
+ ssize_t r = fd_recvmsg_nb(fd, &msg) ;
+ if (r <= 0) return r ;
+ if (msg.msg_flags & MSG_TRUNC) return (errno = ENOBUFS, -1) ;
+ if (nl.nl_pid) return (errno = EPROTO, -1) ;
+ for (struct nlmsghdr *hdr = buf ; NLMSG_OK(hdr, r) ; hdr = NLMSG_NEXT(hdr, r))
+ {
+ struct ifinfomsg *ifi = NLMSG_DATA(hdr) ;
+ char ifname[IF_NAMESIZE] ;
+ switch (hdr->nlmsg_type)
+ {
+ case NLMSG_DONE : goto out ;
+ case NLMSG_ERROR : return (errno = EPROTO, -1) ;
+ case RTM_DELLINK :
+ if_indextoname(ifi->ifi_index, ifname) ;
+ e += answer(tab, n, ifname, 0) ;
+ break ;
+ case RTM_NEWLINK :
+ if_indextoname(ifi->ifi_index, ifname) ;
+ e += answer(tab, n, ifname, 1 | !!(ifi->ifi_flags & IFF_UP) << 1 | !!(ifi->ifi_flags & IFF_RUNNING) << 2) ;
+ break ;
+ }
+ }
+ out:
+ return e ;
+}
diff --git a/src/libbcnm/bcnm_if_link_init.c b/src/libbcnm/bcnm_if_link_init.c
new file mode 100644
index 0000000..dad93fd
--- /dev/null
+++ b/src/libbcnm/bcnm_if_link_init.c
@@ -0,0 +1,38 @@
+/* ISC license. */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <unistd.h>
+#include <errno.h>
+#include <sys/socket.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+
+#include <bcnm/if.h>
+
+int bcnm_if_link_init (unsigned int kbufsz)
+{
+ struct sockaddr_nl nl =
+ {
+ .nl_family = AF_NETLINK,
+ .nl_pad = 0,
+ .nl_groups = RTNLGRP_LINK,
+ .nl_pid = 0
+ } ;
+ int fd = socket(AF_NETLINK, SOCK_DGRAM | SOCK_NONBLOCK | SOCK_CLOEXEC, NETLINK_ROUTE) ;
+ if (fd < 0) return -1 ;
+ if (bind(fd, (struct sockaddr *)&nl, sizeof(struct sockaddr_nl)) < 0) goto err ;
+ if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &kbufsz, sizeof(unsigned int)) < 0)
+ {
+ if (errno != EPERM
+ || setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &kbufsz, sizeof(unsigned int)) < 0) goto err ;
+ }
+ return fd ;
+
+ err:
+ close(fd) ;
+ return -1 ;
+}
+
diff --git a/src/libbcnm/deps-lib/bcnm b/src/libbcnm/deps-lib/bcnm
new file mode 100644
index 0000000..3e3bada
--- /dev/null
+++ b/src/libbcnm/deps-lib/bcnm
@@ -0,0 +1,3 @@
+bcnm_if_getstate.o
+bcnm_if_link_init.o
+bcnm_if_link_event.o
diff --git a/src/utils/bcnm-waitif.c b/src/utils/bcnm-waitif.c
new file mode 100644
index 0000000..c5fd556
--- /dev/null
+++ b/src/utils/bcnm-waitif.c
@@ -0,0 +1,91 @@
+/* ISC license. */
+
+#include <string.h>
+#include <net/if.h>
+
+#include <skalibs/strerr2.h>
+#include <skalibs/sgetopt.h>
+#include <skalibs/types.h>
+#include <skalibs/tai.h>
+#include <skalibs/iopause.h>
+
+#include <bcnm/if.h>
+
+#define USAGE "bcnm-waitif [ -u | -d ] [ -t timeout ] [ -k kbufsize ] mask interface..."
+#define dieusage() strerr_dieusage(100, USAGE)
+
+static inline int check (bcnm_if_link_state_t *tab, size_t n, unsigned int mask, int not)
+{
+ size_t i = 0 ;
+ for (; i < n ; i++)
+ if ((tab[i].state & mask) != (not ? 0 : mask)) return 0 ;
+ return 1 ;
+}
+
+int main (int argc, char const *const *argv)
+{
+ iopause_fd x = { .events = IOPAUSE_READ } ;
+ tain_t deadline, tto ;
+ int not = 0 ;
+ unsigned int mask = 1 ;
+ unsigned int kbufsize = 131072 ;
+ PROG = "bcnm-waitif" ;
+ {
+ subgetopt_t l = SUBGETOPT_ZERO ;
+ unsigned int t = 0 ;
+ for (;;)
+ {
+ int opt = subgetopt_r(argc, argv, "udt:k:", &l) ;
+ if (opt == -1) break ;
+ switch (opt)
+ {
+ case 'u' : not = 0 ; break ;
+ case 'd' : not = 1 ; break ;
+ case 't' : if (!uint0_scan(l.arg, &t)) dieusage() ; break ;
+ case 'k' : if (!uint0_scan(l.arg, &kbufsize)) dieusage() ; break ;
+ default : dieusage() ;
+ }
+ }
+ argc -= l.ind ; argv += l.ind ;
+ if (t) tain_from_millisecs(&tto, t) ;
+ else tto = tain_infinite_relative ;
+ }
+ if (argc < 2) dieusage() ;
+ if (!uint0_scan(*argv++, &mask))
+ strerr_dief2x(100, "invalid mask: ", argv[-1]) ;
+
+ x.fd = bcnm_if_link_init(kbufsize) ;
+ if (x.fd < 0) strerr_diefu1sys(111, "bcnm_if_link_init") ;
+
+ tain_now_set_stopwatch_g() ;
+ tain_add_g(&deadline, &tto) ;
+
+ {
+ size_t n = --argc ;
+ bcnm_if_link_state_t tab[n] ;
+ for (size_t i = 0 ; i < n ; i++)
+ {
+ int r ;
+ size_t len = strlen(argv[i]) ;
+ if (len >= IF_NAMESIZE - 1)
+ strerr_dief2x(100, "interface name too long: ", argv[i]) ;
+ memcpy(tab[i].ifname, argv[i], len+1) ;
+ tab[i].changed = 0 ;
+ r = bcnm_if_getstate(argv[i]) ;
+ if (r < 0) strerr_diefu2sys(111, "get state for interface ", argv[i]) ;
+ tab[i].state = r ;
+ }
+
+ for (;;)
+ {
+ int r ;
+ if (check(tab, n, mask, not)) return 0 ;
+ r = iopause_g(&x, 1, &deadline) ;
+ if (r < 0) strerr_diefu1sys(111, "iopause") ;
+ if (!r) strerr_dief1x(99, "timed out") ;
+ if (bcnm_if_link_event(x.fd, tab, n) < 0)
+ strerr_diefu1sys(111, "read rtnetlink event") ;
+ }
+ }
+ return 0 ;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-20 00:51:14 +0000