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Re: [libmicrohttpd] libmicrohttpd installation on Solaris 10

From: Marek, James
Subject: Re: [libmicrohttpd] libmicrohttpd installation on Solaris 10
Date: Wed, 18 Apr 2018 16:34:36 +0000


I found references in the Solaris 10 (SunOs 5.10) Programming Interface Guide 
 that suggest that using port 0 in a 'bind' call should bind the socket to any 
local port given:

    "Internet port numbers less than 1024 (IPPORT_RESERVED) are reserved for 
privileged users. 
     Nonprivileged users can use any Internet port number that is greater than 
     The largest Internet port number is 65535. 

     The port number is not currently bound to some other socket."

I hacked a test program from examples in the Programming Interface Guide and 
produced the following program (please forgive any stylistic errors.)

#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>

struct sockaddr_in6 sin6;

#define MYPORT 0

int sock, length;

int main() {
  sock = socket(AF_INET6, SOCK_STREAM, 0);
  bzero (&sin6, sizeof (sin6));
  sin6.sin6_family = AF_INET6;
  (void) inet_pton (AF_INET6, "::ffff:", sin6.sin6_addr.s6_addr);
  sin6.sin6_port = htons(MYPORT);

  bind(sock, (struct sockaddr *) &sin6, sizeof sin6);

  /* Find out assigned port number and print it out. */
  length = sizeof sin6;
  if (getsockname(sock,(struct sockaddr *) &sin6, &length)
          == -1) {
      perror("getting socket name");
  printf("Socket port #%d\n", ntohs(sin6.sin6_port));


I compiled and linked it with:
    gcc testport0.c -o testport0 -lsocket -lnsl

When I ran it, I got:

jimarek> ./testport0
Socket port #47378

If you would like me to investigate further, please suggest whatever tests 
would be helpful.


-----Original Message-----
From: libmicrohttpd [mailto:address@hidden On Behalf Of Christian Grothoff
Sent: Wednesday, April 18, 2018 3:47 AM
To: address@hidden
Subject: Re: [libmicrohttpd] libmicrohttpd installation on Solaris 10

Dear Marek,

Thanks for your report.  As for the "test_options" failure, I wonder what 
happens on Solaris 10 if you "bind()" a socket to the port 0.
Given the error message, it seems that the semantics are different from those 
on other platforms: on GNU/Linux, bind()ing to 0 means "pick a random free 
port".  If on Solaris this is simply illegal, that would explain the test 

I don't have a Solaris 10 box. Can you confirm this is the case? If so, we need 
to document this limitation on Solaris (bind-to-random-port not
supported) and modify the test to "skip" that check.

Happy hacking!


On 04/17/2018 09:18 PM, Marek, James wrote:
> FAIL: test_options
> ==================
> Failed to bind to port 0: Cannot assign requested address
> running test: ip addr option [fail]
> FAIL test_options (exit status: 1)

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