Network Working Group J. Reynolds Request for Comments: 1700 J ...

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RFC 1700 Assigned Numbers October 1994[Guido van Rossum][SC3] Steve Casner [Joel Snyder][SXA] Susie Armstrong [SXD] Steve Deering []URL = ftp://ftp.isi.edu/in-notes/iana/assignments/multicast-addressesReynolds & Postel [Page 60]
RFC 1700 Assigned Numbers October 1994SUN RPC NUMBERSTo obtain SUN Remote Procedure Call (RPC) numbers send an e-mailrequest to "rpc@sun.com".The RPC port management service (’portmap’ in SunOS versions less than5.0 and ’rpcbind’ in SunOS versions greater than 5.0) "registers" theIP port number that is allocated to a particular service when thatservice is created. It does not allocate ports on behalf of thoseservices.For an exact specification of the semantics refer to the source codeof svcudp_create() and svctcp_create() in the archives. In shorthowever is that these interfaces, and svc_tli_create their TransportIndependent RPC equivalent, take either a user specified port numberor RPC_ANY (-1) which effectively means "I don’t care." In the "Idon’t care" case the create code simply calls socket(2) or t_open(3n)which allocates an IP port based on the rules:if euid of the requesting process is 0 (i.e., root)allocate the next available port number in thereserved port range.elseallocate the next available port in the non-reservedrange.Port numbers count up sequentially.Can a port that is "assigned" can be used when the assignee’s serviceis not present? Say port 501 is assigned to the "jeans" service. Ona machine that does not have the "jeans" service, nor has any clientsthat might be expecting to use it, is port 501 available for otheruses? Any dynamic allocation process, like the portmapper, thatchooses the next unused port might allocate port 501 dynamically to aprocess that asked for a "I don’t care" port. So any dynamicallocation scheme may pick an unused port that happened to correspondto a port number that had been "assigned" but was currently unused.While it might be desirable, it is impossible to guarantee that anyunused port, even though officially assigned to a service, is notpicked by a dynamic allocator since such an assignment might occurlong after the delivery of the system into a site that doesn’t watchfor the latest list.There is the restriction that only "superuser" on BSD derived systemssuch as SunOS can bind to a port number that is less than 1024. Soprograms have used this information in the past to identify whether orReynolds & Postel [Page 61]
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Network Working Group J. Reynolds Request for Comments: 1700 J ...

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