Fix network & domain interface logic

Issue: https://gitee.com/openharmony/third_party_musl/issues/I7NWEI

test: libc-test
Signed-off-by: zzulilyw <378305181@qq.com>

libc-test/src/functionalext/supplement/manual/network/gethostbyaddr.c

@@ -36,9 +36,7 @@ void gethostbyaddre_0100(void)
         t_error("%s gethostbyaddr error:%s\n", __func__, strerror(h_errno));
     }
     EXPECT_TRUE("gethostbyaddre_0100", hptr != NULL);
-    if (strcmp(hptr->h_name, "localhost") && strcmp(hptr->h_name, "127.0.0.1")) {
-        t_error("gethostbyname2_0100");
-    }
+    EXPECT_STREQ("gethostbyaddre_0100", hptr->h_name, "localhost");
 }
 
 /**

libc-test/src/functionalext/supplement/manual/network/gethostbyaddr_r.c

@@ -32,9 +32,7 @@ void gethostbyaddr_r_0100(void)
     in_addr_t a = inet_addr("127.0.0.1");
     int ret = gethostbyaddr_r((void *)&a, 4, AF_INET, &h, buf, sizeof(buf), &res, &err);
     EXPECT_EQ("gethostbyaddr_r_0100", ret, 0);
-    if (strcmp(h.h_name, "localhost") && strcmp(h.h_name, "127.0.0.1")) {
-        t_error("gethostbyname2_0100");
-    }
+    EXPECT_TRUE("gethostbyaddr_r_0100", strcmp(h.h_name, "localhost") == 0);
 }
 
 /**

libc-test/src/functionalext/supplement/manual/network/gethostbyname2.c

@@ -20,7 +20,6 @@
 #include <stdio.h>
 #include <sys/socket.h>
 #include <stdbool.h>
-#include <string.h>
 #include "functionalext.h"
 
 typedef void (*TEST_FUN)();
@@ -39,9 +38,7 @@ void gethostbyname2_0100(void)
         flag = true;
     }
     EXPECT_TRUE("gethostbyname2_0100", flag);
-    if (strcmp(hptr->h_name, "localhost") && strcmp(hptr->h_name, "127.0.0.1")) {
-        t_error("gethostbyname2_0100");
-    }
+    EXPECT_STREQ("gethostbyname2_0100", hptr->h_name, "127.0.0.1");
 }
 
 /**

libc-test/src/functionalext/supplement/manual/network/gethostbyname2_r.c

@@ -33,7 +33,7 @@ void gethostbyname2_r_0100(void)
     char *name = "127.0.0.1";
     int ret = gethostbyname2_r(name, AF_INET, &h, buf, sizeof(buf), &res, &err);
     EXPECT_EQ("gethostbyname2_r_0100", ret, 0);
-    EXPECT_TRUE("gethostbyname2_r_0100", strcmp(h.h_name, "127.0.0.1") == 0);
+    EXPECT_STREQ("gethostbyname2_r_0100", h.h_name, "127.0.0.1");
 }
 
 /**
@@ -80,7 +80,8 @@ void gethostbyname2_r_0400(void)
     int err = 0;
     char *name = "localhost";
     int ret = gethostbyname2_r(name, 0, &h, buf, sizeof(buf), &res, &err);
-    EXPECT_NE("gethostbyname2_r_0400", ret, 0);
+    EXPECT_EQ("gethostbyname2_r_0400", ret, 0);
+    EXPECT_STREQ("gethostbyname2_r_0400", "localhost", h.h_name);
 }
 
 int main(int argc, char *argv[])
@@ -88,5 +89,6 @@ int main(int argc, char *argv[])
     gethostbyname2_r_0100();
     gethostbyname2_r_0200();
     gethostbyname2_r_0300();
+    gethostbyname2_r_0400();
     return t_status;
 }

musl_src.gni

@@ -2103,6 +2103,7 @@ musl_src_porting_file = [
   "src/malloc/stats.c",
   "src/malloc/calloc.c",
   "src/malloc/free.c",
+  "src/network/getnameinfo.c",
   "src/malloc/libc_calloc.c",
   "src/malloc/realloc.c",
   "src/network/inet_legacy.c",

porting/linux/user/src/network/getnameinfo.c

+#include <netdb.h>
+#include <limits.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+#include <ctype.h>
+#include <resolv.h>
+#include "lookup.h"
+#include "stdio_impl.h"
+
+#define PTR_MAX (64 + sizeof ".in-addr.arpa")
+#define RR_PTR 12
+#define BREAK 0
+#define CONTINUE 1
+
+extern char fixed_hosts[][23];
+
+static char *itoa(char *p, unsigned x) {
+	p += 3*sizeof(int);
+	*--p = 0;
+	do {
+		*--p = '0' + x % 10;
+		x /= 10;
+	} while (x);
+	return p;
+}
+
+static void mkptr4(char *s, const unsigned char *ip)
+{
+	sprintf(s, "%d.%d.%d.%d.in-addr.arpa",
+		ip[3], ip[2], ip[1], ip[0]);
+}
+
+static void mkptr6(char *s, const unsigned char *ip)
+{
+	static const char xdigits[] = "0123456789abcdef";
+	int i;
+	for (i=15; i>=0; i--) {
+		*s++ = xdigits[ip[i]&15]; *s++ = '.';
+		*s++ = xdigits[ip[i]>>4]; *s++ = '.';
+	}
+	strcpy(s, "ip6.arpa");
+}
+
+static inline int get_hosts_str(char *line, int length, FILE *f, int *i)
+{
+	if (f) {
+		return fgets(line, sizeof line, f);
+	}
+	if (*i < 2) {
+		memcpy(line, fixed_hosts[*i], strlen(fixed_hosts[*i]));
+		(*i)++;
+		return 1;
+	}
+	return NULL;
+}
+
+static void reverse_hosts(char *buf, const unsigned char *a, unsigned scopeid, int family)
+{
+	char line[512], *p, *z;
+	unsigned char _buf[1032], atmp[16];
+	struct address iplit;
+	FILE _f, *f = __fopen_rb_ca("/etc/hosts", &_f, _buf, sizeof _buf);
+	if (family == AF_INET) {
+		memcpy(atmp+12, a, 4);
+		memcpy(atmp, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12);
+		a = atmp;
+	}
+	int i = 0;
+	while (i < 2 && get_hosts_str(line, sizeof line, f, &i)) {
+		if ((p=strchr(line, '#'))) *p++='\n', *p=0;
+
+		for (p=line; *p && !isspace(*p); p++);
+		*p++ = 0;
+		if (__lookup_ipliteral(&iplit, line, AF_UNSPEC)<=0)
+			continue;
+
+		if (iplit.family == AF_INET) {
+			memcpy(iplit.addr+12, iplit.addr, 4);
+			memcpy(iplit.addr, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12);
+			iplit.scopeid = 0;
+		}
+
+		if (memcmp(a, iplit.addr, 16) || iplit.scopeid != scopeid)
+			continue;
+			
+		for (; *p && isspace(*p); p++);
+		for (z=p; *z && !isspace(*z); z++);
+		*z = 0;
+		if (z-p < 256) {
+			memcpy(buf, p, z-p+1);
+			break;
+		}
+	}
+	if (f) {
+		__fclose_ca(f);
+	}
+}
+
+static void reverse_services(char *buf, int port, int dgram)
+{
+	unsigned long svport;
+	char line[128], *p, *z;
+	unsigned char _buf[1032];
+	FILE _f, *f = __fopen_rb_ca("/etc/services", &_f, _buf, sizeof _buf);
+	if (!f) return;
+	while (fgets(line, sizeof line, f)) {
+		if ((p=strchr(line, '#'))) *p++='\n', *p=0;
+
+		for (p=line; *p && !isspace(*p); p++);
+		if (!*p) continue;
+		*p++ = 0;
+		svport = strtoul(p, &z, 10);
+
+		if (svport != port || z==p) continue;
+		if (dgram && strncmp(z, "/udp", 4)) continue;
+		if (!dgram && strncmp(z, "/tcp", 4)) continue;
+		if (p-line > 32) continue;
+
+		memcpy(buf, line, p-line);
+		break;
+	}
+	__fclose_ca(f);
+}
+
+static int dns_parse_callback(void *c, int rr, const void *data, int len, const void *packet)
+{
+	if (rr != RR_PTR) return 0;
+	if (__dn_expand(packet, (const unsigned char *)packet + 512,
+	    data, c, 256) <= 0)
+		*(char *)c = 0;
+	return 0;
+	
+}
+
+int getnameinfo(const struct sockaddr *restrict sa, socklen_t sl,
+	char *restrict node, socklen_t nodelen,
+	char *restrict serv, socklen_t servlen,
+	int flags)
+{
+	char ptr[PTR_MAX];
+	char buf[256], num[3*sizeof(int)+1];
+	int af = sa->sa_family;
+	unsigned char *a;
+	unsigned scopeid;
+
+	switch (af) {
+	case AF_INET:
+		a = (void *)&((struct sockaddr_in *)sa)->sin_addr;
+		if (sl < sizeof(struct sockaddr_in)) return EAI_FAMILY;
+		mkptr4(ptr, a);
+		scopeid = 0;
+		break;
+	case AF_INET6:
+		a = (void *)&((struct sockaddr_in6 *)sa)->sin6_addr;
+		if (sl < sizeof(struct sockaddr_in6)) return EAI_FAMILY;
+		if (memcmp(a, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12))
+			mkptr6(ptr, a);
+		else
+			mkptr4(ptr, a+12);
+		scopeid = ((struct sockaddr_in6 *)sa)->sin6_scope_id;
+		break;
+	default:
+		return EAI_FAMILY;
+	}
+
+	if (node && nodelen) {
+		buf[0] = 0;
+		if (!(flags & NI_NUMERICHOST)) {
+			reverse_hosts(buf, a, scopeid, af);
+		}
+		if (!*buf && !(flags & NI_NUMERICHOST)) {
+			unsigned char query[18+PTR_MAX], reply[512];
+			int qlen = __res_mkquery(0, ptr, 1, RR_PTR,
+				0, 0, 0, query, sizeof query);
+			query[3] = 0; /* don't need AD flag */
+			int rlen = __res_send(query, qlen, reply, sizeof reply);
+			buf[0] = 0;
+			if (rlen > 0)
+				__dns_parse(reply, rlen, dns_parse_callback, buf);
+		}
+		if (!*buf) {
+			if (flags & NI_NAMEREQD) return EAI_NONAME;
+			inet_ntop(af, a, buf, sizeof buf);
+			if (scopeid) {
+				char *p = 0, tmp[IF_NAMESIZE+1];
+				if (!(flags & NI_NUMERICSCOPE) &&
+				    (IN6_IS_ADDR_LINKLOCAL(a) ||
+				     IN6_IS_ADDR_MC_LINKLOCAL(a)))
+					p = if_indextoname(scopeid, tmp+1);
+				if (!p)
+					p = itoa(num, scopeid);
+				*--p = '%';
+				strcat(buf, p);
+			}
+		}
+		if (strlen(buf) >= nodelen) return EAI_OVERFLOW;
+		strcpy(node, buf);
+	}
+
+	if (serv && servlen) {
+		char *p = buf;
+		int port = ntohs(((struct sockaddr_in *)sa)->sin_port);
+		buf[0] = 0;
+		if (!(flags & NI_NUMERICSERV))
+			reverse_services(buf, port, flags & NI_DGRAM);
+		if (!*p)
+			p = itoa(num, port);
+		if (strlen(p) >= servlen)
+			return EAI_OVERFLOW;
+		strcpy(serv, p);
+	}
+
+	return 0;
+}

porting/linux/user/src/network/lookup_name.c

@@ -14,11 +14,17 @@
 #include "lookup.h"
 #include "stdio_impl.h"
 #include "syscall.h"
-
+#define BREAK 0
+#define CONTINUE 1
 #if OHOS_PERMISSION_INTERNET
 uint8_t is_allow_internet(void);
 #endif
 
+char fixed_hosts[][23] = {
+	"127.0.0.1  localhost\r\n\0",
+	"::1  ip6-localhost\r\n\0"
+};
+
 static int is_valid_hostname(const char *host)
 {
 	const unsigned char *s;
@@ -50,6 +56,19 @@ static int name_from_numeric(struct address buf[static 1], const char *name, int
 	return __lookup_ipliteral(buf, name, family);
 }
 
+static inline int get_hosts_str(char *line, int length, FILE *f, int *i)
+{
+	if (f) {
+		return fgets(line, sizeof line, f);
+	}
+	if (*i < 2) {
+		memcpy(line, fixed_hosts[*i], strlen(fixed_hosts[*i]));
+		(*i)++;
+		return 1;
+	}
+	return NULL;
+}
+
 static int name_from_hosts(struct address buf[static MAXADDRS], char canon[static 256], const char *name, int family)
 {
 	char line[512];
@@ -57,15 +76,8 @@ static int name_from_hosts(struct address buf[static MAXADDRS], char canon[stati
 	int cnt = 0, badfam = 0, have_canon = 0;
 	unsigned char _buf[1032];
 	FILE _f, *f = __fopen_rb_ca("/etc/hosts", &_f, _buf, sizeof _buf);
-	if (!f) switch (errno) {
-	case ENOENT:
-	case ENOTDIR:
-	case EACCES:
-		return 0;
-	default:
-		return EAI_SYSTEM;
-	}
-	while (fgets(line, sizeof line, f) && cnt < MAXADDRS) {
+	int i = 0;
+	while (i < 2 && get_hosts_str(line, sizeof line, f, &i) && cnt < MAXADDRS) {
 		char *p, *z;
 
 		if ((p=strchr(line, '#'))) *p++='\n', *p=0;
@@ -98,7 +110,9 @@ static int name_from_hosts(struct address buf[static MAXADDRS], char canon[stati
 			memcpy(canon, p, z-p+1);
 		}
 	}
-	__fclose_ca(f);
+	if (f) {
+		__fclose_ca(f);
+	}
 	return cnt ? cnt : badfam;
 }