From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001 From: Vladimir Azarov Date: Tue, 1 Oct 2024 15:47:05 +0200 Subject: Initial version --- src/network/getservbyport_r.c | 62 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 src/network/getservbyport_r.c (limited to 'src/network/getservbyport_r.c') diff --git a/src/network/getservbyport_r.c b/src/network/getservbyport_r.c new file mode 100644 index 0000000..e4cc307 --- /dev/null +++ b/src/network/getservbyport_r.c @@ -0,0 +1,62 @@ +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include + +int getservbyport_r(int port, const char *prots, + struct servent *se, char *buf, size_t buflen, struct servent **res) +{ + int i; + struct sockaddr_in sin = { + .sin_family = AF_INET, + .sin_port = port, + }; + + if (!prots) { + int r = getservbyport_r(port, "tcp", se, buf, buflen, res); + if (r) r = getservbyport_r(port, "udp", se, buf, buflen, res); + return r; + } + *res = 0; + + /* Align buffer */ + i = (uintptr_t)buf & sizeof(char *)-1; + if (!i) i = sizeof(char *); + if (buflen <= 3*sizeof(char *)-i) + return ERANGE; + buf += sizeof(char *)-i; + buflen -= sizeof(char *)-i; + + if (strcmp(prots, "tcp") && strcmp(prots, "udp")) return EINVAL; + + se->s_port = port; + se->s_proto = (char *)prots; + se->s_aliases = (void *)buf; + buf += 2*sizeof(char *); + buflen -= 2*sizeof(char *); + se->s_aliases[1] = 0; + se->s_aliases[0] = se->s_name = buf; + + switch (getnameinfo((void *)&sin, sizeof sin, 0, 0, buf, buflen, + strcmp(prots, "udp") ? 0 : NI_DGRAM)) { + case EAI_MEMORY: + case EAI_SYSTEM: + return ENOMEM; + case EAI_OVERFLOW: + return ERANGE; + default: + return ENOENT; + case 0: + break; + } + + /* A numeric port string is not a service record. */ + if (strtol(buf, 0, 10)==ntohs(port)) return ENOENT; + + *res = se; + return 0; +} -- cgit v1.2.3