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01:23:31 <zzo38> How in C do I make a DNS lookup in order to compare the result with the result if a inet_aton() call?
01:23:41 <zzo38> s/result if a/result of a/
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03:32:17 <pikhq> zzo38: Wouldn't you use gethostbyaddr?
03:32:49 <pikhq> Or, really, to be reasonably modern and not-obsolescent, getaddrinfo
03:33:54 <zzo38> I am not trying to perform a reverse DNS lookup (since the reverse DNS might not match the name that the server wants to use anyways)
03:35:23 <pikhq> Yeah, sorry, gethostbyname, but getaddrinfo
03:35:39 <zzo38> Also the type does not seem to match?
03:37:23 <pikhq> The struct sockaddr type is a generic type -- you're intended to look at ai_family to know which type to cast the pointer to.
03:38:46 <zzo38> If it is compared the length sizeof(struct in_addr) will that work then?
03:39:38 <pikhq> struct sockaddr_in, the type for an IPv4 address-and-port, contains a struct in_addr.
03:39:50 <pikhq> https://beej.us/guide/bgnet/html/multi/sockaddr_inman.html is a halfway decent explanation
03:41:24 <zzo38> Currently this program is only IPv4, although later I can fix it so that if the REMOTE_HOST environment variable specifies a IPv6 address then the DNS lookup will use IPv6 instead.
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03:42:47 <pikhq> You'd probably have an easier time just trying to rewrite it to work entirely with getaddrinfo, since getaddrinfo handles it a bit more comprehensively and correctly than you're likely to yourself.
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03:44:37 <zzo38> OK, but can the address be compared properly by use of getaddrinfo? The address to compare it to is the contents of the REMOTE_HOST environment variable (set by xinetd, and contains a numeric dotted quad address)
03:46:12 <pikhq> Well, you can get the struct in_addr or struct in6_addr out of the getaddrinfo results just fine.
03:47:39 <zzo38> Yes, and then can do the comparison with that, will work I suppose, since it is only the IP address which needs to be compared.
03:50:07 <zzo38> Also getaddrinfo can return multiple addresses, and won't that waste memory?
03:50:28 <pikhq> It does briefly -- this is why freeaddrinfo exists.
03:50:48 <pikhq> freeaddrinfo will free *all* of the allocated memory.
03:51:50 <zzo38> What is the limit to how much memory it can use?
03:58:02 <pikhq> The API as stated does not impose any real limits. However, because it makes a DNS query over UDP in practice, that imposes a limit of at most 48 struct addrinfos being allocated.
03:58:34 <pikhq> (and the actual memory usage is a function of the number of A and AAAA records for the queried host)
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04:15:37 <zzo38> It seem it can be a problem if it can be caused to waste too much memory
04:21:33 <zzo38> I found a report of a security problem with these DNS resolving functions, although it seems to be applicable only to AAAA records. I do not have IPv6, so presumably it is OK
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06:37:29 <zzo38> OK I think I implemented it now (with getaddrinfo), now I can try to test
06:41:58 <zzo38> Yes, it look like it is work
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12:27:55 <esowiki> [[Alchemist]] N https://esolangs.org/w/index.php?oldid=58500 * BMO * (+3626) Created page with "{{infobox proglang |name=6 |paradigms=[[:Category:Nondeterministic|non-deterministic]] |author=[https://esolangs.org/wiki/User:BMO BMO] |year=[[:Category:2018|2018]] |typesy..."
12:32:38 <esowiki> [[User:BMO]] https://esolangs.org/w/index.php?diff=58501&oldid=57097 * BMO * (+141)
13:04:18 <esowiki> [[Alchemist]] https://esolangs.org/w/index.php?diff=58502&oldid=58500 * BMO * (+298)
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15:40:45 <esowiki> [[Alchemist]] https://esolangs.org/w/index.php?diff=58503&oldid=58502 * BMO * (+6)
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17:40:04 <b_jonas> zzo38: I may be misunderstanding this, but I think getaddrinfo allocates a linked list, and you can use freeaddrinfo to free any tail of that list
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17:43:54 <b_jonas> zzo38: but sure, there are other DNS query libraries out there if that's what you want
17:44:00 <b_jonas> ones that behave very different from libc
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19:45:58 <zzo38> b_jonas: I am implementing the Netsubscribe program, and I have implemented the DNS verification that works (it frees the entire list after checking though, since only the first entry is used; the address from it is copied out anyways)
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22:50:55 <HackEso> 872) <fizzie> GreyKnight: And Gregor itself is kind of a probability distribution spread all over the globe. \ 1248) <olsner> I've heard that scow is oerjanspeak for something
22:51:01 <HackEso> norway//Norway is the suburb capital of Sweden. It's where the Nobel Peace Prize is announced. It's a warm, dry place, at least compared to Québec.
22:51:12 <HackEso> ronald reagan//Ronald Reagan was an actor so great that he managed to convince the US that he was the President. Then he created the Star Wars project to destroy the Soviet Union.
22:55:47 <HackEso> Star Wars was a missile defence system invented by Ronald Reagan. With it, he managed to destroy the Soviet Union, then rode into the sunset.
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