| Summary: | getservbyname("nfsrdma", "tcp") returns wrong values | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Steve Dickson <steved> |
| Component: | glibc | Assignee: | Carlos O'Donell <codonell> |
| Status: | CLOSED NOTABUG | QA Contact: | qe-baseos-tools-bugs |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 7.3 | CC: | ashankar, fweimer, mnewsome, pfrankli |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2016-02-22 17:04:38 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
The returned port number is in network byte order. Use this instead:
#include <stdio.h>
#include <netdb.h>
main()
{
struct servent *sv = getservbyname("nfsrdma", "tcp");
if (sv)
printf("name '%s' port %d proto '%s'\n",
sv->s_name, ntohs(sv->s_port), sv->s_proto);
}
It's unfortunate the two numbers are so close together, otherwise it would be easier to spot the mistake.
(In reply to Florian Weimer from comment #2) > The returned port number is in network byte order. Use this instead: > > #include <stdio.h> > #include <netdb.h> > > main() > { > struct servent *sv = getservbyname("nfsrdma", "tcp"); > > if (sv) > printf("name '%s' port %d proto '%s'\n", > sv->s_name, ntohs(sv->s_port), sv->s_proto); > } > > It's unfortunate the two numbers are so close together, otherwise it would > be easier to spot the mistake. Ah... Perfect... Thanks you!!! |
Description of problem: getservbyname("nfsrdma", "tcp") should return name 'nfsrdma' port 20049 proto 'tcp' since that is one of the 3 nfsrdma entries in /etc/services $ grep nfsrdma /etc/services nfsrdma 20049/tcp # Network File System (NFS) over RDMA nfsrdma 20049/udp # Network File System (NFS) over RDMA nfsrdma 20049/sctp # Network File System (NFS) over RDMA but these are the values being returned name 'nfsrdma' port 20814 proto 'tcp' and you will note port 20814 does not exist in /etc/sevices Version-Release number of selected component (if applicable): glibc-2.17-105.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1.Use the following reproducer #include <stdio.h> #include <netdb.h> main() { struct servent *sv = getservbyname("nfsrdma", "tcp"); if (sv) printf("name '%s' port %d proto '%s'\n", sv->s_name, sv->s_port, sv->s_proto); }