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socket: Introduce function to obtain socket name 

Using this function, one can obtain a human-readable string identifying
the host and port names of the socket.

Change-Id: Ib5de5c7b9effe1b0a363e4473a7be7fa38ca6ef3
This commit is contained in:
Harald Welte 2017-01-26 00:03:10 +01:00
parent 319f321da5
commit 48f5583347
3 changed files with 46 additions and 1 deletions
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1
TODO-RELEASE
View File

@ -7,3 +7,4 @@
# If any interfaces have been added since the last public release: c:r:a + 1.
# If any interfaces have been removed or changed since the last public release: c:r:0.
#library what description / commit summary line
libosmocore new function osmo_sock_get_name()

2
include/osmocom/core/socket.h
View File

@ -38,4 +38,6 @@ int osmo_sock_unix_init(uint16_t type, uint8_t proto,
int osmo_sock_unix_init_ofd(struct osmo_fd *ofd, uint16_t type, uint8_t proto,
const char *socket_path, unsigned int flags);
char *osmo_sock_get_name(void *ctx, int fd);
/*! @} */

44
src/socket.c
View File

@ -1,5 +1,5 @@
/*
* (C) 2011 by Harald Welte <laforge@gnumonks.org>
* (C) 2011-2017 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
@ -34,6 +34,7 @@
#include <osmocom/core/logging.h>
#include <osmocom/core/select.h>
#include <osmocom/core/socket.h>
#include <osmocom/core/talloc.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
@ -393,6 +394,47 @@ int osmo_sock_unix_init_ofd(struct osmo_fd *ofd, uint16_t type, uint8_t proto,
return osmo_fd_init_ofd(ofd, osmo_sock_unix_init(type, proto, socket_path, flags));
}
/*! \brief Get address/port information on soocket in dyn-alloc string
* \param[in] ctx talloc context from which to allocate string buffer
* \param[in] fd file descriptor of socket
* \returns string identifying the connection of this socket
*/
char *osmo_sock_get_name(void *ctx, int fd)
{
struct sockaddr sa_l, sa_r;
socklen_t sa_len_l = sizeof(sa_l);
socklen_t sa_len_r = sizeof(sa_r);
char hostbuf_l[64], hostbuf_r[64];
char portbuf_l[16], portbuf_r[16];
int rc;
rc = getsockname(fd, &sa_l, &sa_len_l);
if (rc < 0)
return NULL;
rc = getnameinfo(&sa_l, sa_len_l, hostbuf_l, sizeof(hostbuf_l),
portbuf_l, sizeof(portbuf_l),
NI_NUMERICHOST | NI_NUMERICSERV);
if (rc < 0)
return NULL;
rc = getpeername(fd, &sa_r, &sa_len_r);
if (rc < 0)
goto local_only;
rc = getnameinfo(&sa_r, sa_len_r, hostbuf_r, sizeof(hostbuf_r),
portbuf_r, sizeof(portbuf_r),
NI_NUMERICHOST | NI_NUMERICSERV);
if (rc < 0)
goto local_only;
return talloc_asprintf(ctx, "(%s:%s<->%s:%s)", hostbuf_r, portbuf_r,
hostbuf_l, portbuf_l);
local_only:
return talloc_asprintf(ctx, "(NULL<->%s:%s)", hostbuf_l, portbuf_l);
}
#endif /* HAVE_SYS_SOCKET_H */
/*! @} */