I have been trying to think of a good way to check for overflow of
port numbers of PF_INET sockets that are passed by the user. So far,
this is what I have come up with:
: #include <netinet/in.h>
:
: #include <err.h>
: #include <errno.h>
: #include <limits.h>
: #include <stdio.h>
: #include <stdlib.h>
:
: int
: main(int argc, char *argv[])
: {
: static long tmp;
: static char *errp;
: in_port_t port;
:
: if (argc != 2)
: errx(1, "usage: %s port", argv[0]);
:
: errno == 0;
: tmp = strtol(argv[1], &errp, 0);
: if (errp == argv[1] || errno == EINVAL || errno == ERANGE)
: errx(1, "invalid number '%s'", argv[1]);
: if (tmp > IPPORT_MAX)
: errx(1, "%ld will overflow as a port number (max %d)",
: tmp, IPPORT_MAX);
:
: port = (in_port_t)tmp;
: printf("Using port number %d\n", port);
: return (0);
: }
Does this look ok to you all?
Have I missed anything obvious that I should also check?
- Giorgos
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