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-rw-r--r--erts/emulator/drivers/common/inet_drv.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/erts/emulator/drivers/common/inet_drv.c b/erts/emulator/drivers/common/inet_drv.c
index 1885338ce5..b619e6ebb9 100644
--- a/erts/emulator/drivers/common/inet_drv.c
+++ b/erts/emulator/drivers/common/inet_drv.c
@@ -8345,10 +8345,10 @@ static ErlDrvData inet_start(ErlDrvPort port, int size, int protocol)
return (ErlDrvData)desc;
}
-
-#ifndef MAXHOSTNAMELEN
-#define MAXHOSTNAMELEN 256
-#endif
+/* MAXHOSTNAMELEN could be 64 or 255 depending
+on the platform. Instead, use INET_MAXHOSTNAMELEN
+which is always 255 across all platforms */
+#define INET_MAXHOSTNAMELEN 255
/*
** common TCP/UDP/SCTP control command
@@ -8525,13 +8525,14 @@ static ErlDrvSSizeT inet_ctl(inet_descriptor* desc, int cmd, char* buf,
}
case INET_REQ_GETHOSTNAME: { /* get host name */
- char tbuf[MAXHOSTNAMELEN];
+ char tbuf[INET_MAXHOSTNAMELEN + 1];
DEBUGF(("inet_ctl(%ld): GETHOSTNAME\r\n", (long)desc->port));
if (len != 0)
return ctl_error(EINVAL, rbuf, rsize);
- if (IS_SOCKET_ERROR(sock_hostname(tbuf, MAXHOSTNAMELEN)))
+ /* gethostname requires len to be max(hostname) + 1 */
+ if (IS_SOCKET_ERROR(sock_hostname(tbuf, INET_MAXHOSTNAMELEN + 1)))
return ctl_error(sock_errno(), rbuf, rsize);
return ctl_reply(INET_REP_OK, tbuf, strlen(tbuf), rbuf, rsize);
}