The branch stable/13 has been updated by des:
URL:
https://cgit.FreeBSD.org/src/commit/?id=be0706e8e15de57c7d245abe918f494d90a49934
commit be0706e8e15de57c7d245abe918f494d90a49934
Author: Dag-Erling Smørgrav <d...@freebsd.org>
AuthorDate: 2025-05-31 18:07:46 +0000
Commit: Dag-Erling Smørgrav <d...@freebsd.org>
CommitDate: 2025-06-07 06:51:39 +0000
netcat: Allow service names to be used.
Someone should really do a vendor import, but it's non-trivial, as we
have local modifications. In the meantime, here's a nine-year-old
upstream patch which allows service names to be used instead of port
numbers.
MFC after: 1 week
Obtained from: OpenBSD
Reviewed by: allanjude
Differential Revision: https://reviews.freebsd.org/D50348
(cherry picked from commit 6d3d1fc3a30453be19831f79399bcba0ae822ad1)
---
contrib/netcat/nc.1 | 6 +++---
contrib/netcat/netcat.c | 42 +++++++++++++++++++++++++++++-------------
2 files changed, 32 insertions(+), 16 deletions(-)
diff --git a/contrib/netcat/nc.1 b/contrib/netcat/nc.1
index 2627920cca15..dadff019e9b8 100644
--- a/contrib/netcat/nc.1
+++ b/contrib/netcat/nc.1
@@ -27,7 +27,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd July 10, 2020
+.Dd May 14, 2025
.Dt NC 1
.Os
.Sh NAME
@@ -334,8 +334,8 @@ sockets, a destination is required and is the socket path
to connect to
option is given).
.Pp
.Ar port
-can be a single integer or a range of ports.
-Ranges are in the form nn-mm.
+can be a specified as a numeric port number, or as a service name.
+Ports may be specified in a range of the form nn-mm.
In general,
a destination port must be specified,
unless the
diff --git a/contrib/netcat/netcat.c b/contrib/netcat/netcat.c
index eb3c7544be76..20bb2d056fce 100644
--- a/contrib/netcat/netcat.c
+++ b/contrib/netcat/netcat.c
@@ -116,6 +116,7 @@ char *portlist[PORT_MAX+1];
char *unix_dg_tmp_socket;
void atelnet(int, unsigned char *, unsigned int);
+int strtoport(char *portstr, int udp);
void build_ports(char *);
void help(void);
int local_listen(char *, char *, struct addrinfo);
@@ -1145,6 +1146,26 @@ atelnet(int nfd, unsigned char *buf, unsigned int size)
}
}
+int
+strtoport(char *portstr, int udp)
+{
+ struct servent *entry;
+ const char *errstr;
+ char *proto;
+ int port = -1;
+
+ proto = udp ? "udp" : "tcp";
+
+ port = strtonum(portstr, 1, PORT_MAX, &errstr);
+ if (errstr == NULL)
+ return port;
+ if (errno != EINVAL)
+ errx(1, "port number %s: %s", errstr, portstr);
+ if ((entry = getservbyname(portstr, proto)) == NULL)
+ errx(1, "service \"%s\" unknown", portstr);
+ return ntohs(entry->s_port);
+}
+
/*
* build_ports()
* Build an array of ports in portlist[], listing each port
@@ -1153,7 +1174,6 @@ atelnet(int nfd, unsigned char *buf, unsigned int size)
void
build_ports(char *p)
{
- const char *errstr;
char *n;
int hi, lo, cp;
int x = 0;
@@ -1163,13 +1183,8 @@ build_ports(char *p)
n++;
/* Make sure the ports are in order: lowest->highest. */
- hi = strtonum(n, 1, PORT_MAX, &errstr);
- if (errstr)
- errx(1, "port number %s: %s", errstr, n);
- lo = strtonum(p, 1, PORT_MAX, &errstr);
- if (errstr)
- errx(1, "port number %s: %s", errstr, p);
-
+ hi = strtoport(n, uflag);
+ lo = strtoport(p, uflag);
if (lo > hi) {
cp = hi;
hi = lo;
@@ -1198,11 +1213,12 @@ build_ports(char *p)
}
}
} else {
- hi = strtonum(p, 1, PORT_MAX, &errstr);
- if (errstr)
- errx(1, "port number %s: %s", errstr, p);
- portlist[0] = strdup(p);
- if (portlist[0] == NULL)
+ char *tmp;
+
+ hi = strtoport(p, uflag);
+ if (asprintf(&tmp, "%d", hi) != -1)
+ portlist[0] = tmp;
+ else
err(1, NULL);
}
}
