[libvirt] [PATCH 05/23] util: add API for resolving socket service names
The getservent() APIs are not re-entrant safe so cannot be used in any
threaded program. Add a wrapper around getaddrinfo() for resolving the
service names to a port number.
Signed-off-by: Daniel P. Berrangé <berrange(a)redhat.com>
---
src/libvirt_private.syms | 1 +
src/util/virsocketaddr.c | 51 ++++++++++++++++++++++++++++++++++++++++
src/util/virsocketaddr.h | 2 ++
3 files changed, 54 insertions(+)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index ce614e04bd..1adf735a38 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -2919,6 +2919,7 @@ virSocketAddrParseIPv4;
virSocketAddrParseIPv6;
virSocketAddrPrefixToNetmask;
virSocketAddrPTRDomain;
+virSocketAddrResolveService;
virSocketAddrSetIPv4Addr;
virSocketAddrSetIPv4AddrNetOrder;
virSocketAddrSetIPv6Addr;
diff --git a/src/util/virsocketaddr.c b/src/util/virsocketaddr.c
index 7a50cbe040..790bc0ebec 100644
--- a/src/util/virsocketaddr.c
+++ b/src/util/virsocketaddr.c
@@ -235,6 +235,57 @@ virSocketAddrParseIPv6(virSocketAddrPtr addr, const char *val)
return virSocketAddrParse(addr, val, AF_INET6);
}
+/**
+ * virSocketAddrResolveService:
+ * @service: a service name or port number
+ *
+ * Resolve a service, which might be a plain port or service name,
+ * into a port number for IPv4/IPv6 usage
+ *
+ * Returns a numberic port number
+ */
+int virSocketAddrResolveService(const char *service)
+{
+ struct addrinfo *res, *tmp;
+ struct addrinfo hints;
+ int err;
+ int port = -1;
+
+ memset(&hints, 0, sizeof(hints));
+
+ if ((err = getaddrinfo(NULL, service, &hints, &res)) != 0) {
+ virReportError(VIR_ERR_SYSTEM_ERROR,
+ _("Cannot parse socket service '%s': %s"),
+ service, gai_strerror(err));
+ return -1;
+ }
+
+ tmp = res;
+ while (tmp) {
+ if (tmp->ai_family == AF_INET) {
+ struct sockaddr_in in;
+ memcpy(&in, tmp->ai_addr, sizeof(in));
+ port = in.sin_port;
+ goto cleanup;
+ } else if (tmp->ai_family == AF_INET6) {
+ struct sockaddr_in6 in;
+ memcpy(&in, tmp->ai_addr, sizeof(in));
+ port = in.sin6_port;
+ goto cleanup;
+ }
+ tmp++;
+ }
+
+ virReportError(VIR_ERR_SYSTEM_ERROR,
+ _("No matches for socket service '%s': %s"),
+ service, gai_strerror(err));
+
+ cleanup:
+ freeaddrinfo(res);
+
+ return port;
+}
+
/*
* virSocketAddrSetIPv4AddrNetOrder:
* @addr: the location to store the result
diff --git a/src/util/virsocketaddr.h b/src/util/virsocketaddr.h
index 9dbd8caa0d..bb97e6e3a0 100644
--- a/src/util/virsocketaddr.h
+++ b/src/util/virsocketaddr.h
@@ -98,6 +98,8 @@ int virSocketAddrParseIPv4(virSocketAddrPtr addr,
int virSocketAddrParseIPv6(virSocketAddrPtr addr,
const char *val);
+int virSocketAddrResolveService(const char *service);
+
void virSocketAddrSetIPv4AddrNetOrder(virSocketAddrPtr s, uint32_t addr);
void virSocketAddrSetIPv4Addr(virSocketAddrPtr s, uint32_t addr);
void virSocketAddrSetIPv6AddrNetOrder(virSocketAddrPtr s, uint32_t addr[4]);
--
2.21.0