diff options
| author | Alexander Couzens <lynxis@fe80.eu> | 2020-07-27 22:33:01 +0200 |
|---|---|---|
| committer | Alexander Couzens <lynxis@fe80.eu> | 2020-09-07 16:22:21 +0200 |
| commit | 0f36421ba8dc117fdc55129f0dff54895a3d55e1 (patch) | |
| tree | 1db074676059465921110317dabd01f590792b6b | |
| parent | 3b688835b05afa3339a4c0d2e5e2ead9e34595b2 (diff) | |
add osmo_sockaddr_local_ip() to determine the local address for a remote.
Similiar to osmo_sock_local_ip but for osmo_sockaddr.
Change-Id: I9cd2c5ceb28183e2fd2d28f9c9088c3fcac643d2
| -rw-r--r-- | include/osmocom/core/socket.h | 2 | ||||
| -rw-r--r-- | src/socket.c | 23 |
2 files changed, 25 insertions, 0 deletions
diff --git a/include/osmocom/core/socket.h b/include/osmocom/core/socket.h index e417f429..47a372c7 100644 --- a/include/osmocom/core/socket.h +++ b/include/osmocom/core/socket.h @@ -113,6 +113,8 @@ int osmo_sock_mcast_subscribe(int fd, const char *grp_addr); int osmo_sock_local_ip(char *local_ip, const char *remote_ip); +int osmo_sockaddr_local_ip(struct osmo_sockaddr *local_ip, + const struct osmo_sockaddr *remote_ip); int osmo_sockaddr_cmp(struct osmo_sockaddr *a, struct osmo_sockaddr *b); #endif /* (!EMBEDDED) */ diff --git a/src/socket.c b/src/socket.c index 803af313..f078242c 100644 --- a/src/socket.c +++ b/src/socket.c @@ -1662,6 +1662,29 @@ int osmo_sock_local_ip(char *local_ip, const char *remote_ip) return 0; } +/*! Determine the matching local address for a given remote address. + * \param[out] local_ip caller provided memory for resulting local address + * \param[in] remote_ip remote address + * \returns 0 on success; negative otherwise + */ +int osmo_sockaddr_local_ip(struct osmo_sockaddr *local_ip, const struct osmo_sockaddr *remote_ip) +{ + int sfd; + int rc; + socklen_t local_ip_len; + + sfd = osmo_sock_init_osa(SOCK_DGRAM, IPPROTO_UDP, NULL, remote_ip, OSMO_SOCK_F_CONNECT); + if (sfd < 0) + return -EINVAL; + + memset(local_ip, 0, sizeof(*local_ip)); + local_ip_len = sizeof(*local_ip); + rc = getsockname(sfd, (struct sockaddr *)local_ip, &local_ip_len); + close(sfd); + + return rc; +} + /*! Compare two osmo_sockaddr. * \param[in] a * \param[in] b |