networking/interface.c: huke remaining big statics; use malloc for INET[6]_rresolve

return value. Went thru callers and adjusted them - code got smaller too.

function                                             old     new   delta
ip_port_str                                            -     126    +126
INET6_rresolve                                       165     182     +17
static.cache                                          20      24      +4
route_main                                          2092    2091      -1
INET_sprint                                           61      59      -2
INET_nn                                                4       -      -4
INET6_sprint                                          59      53      -6
udp_do_one                                           518     508     -10
tcp_do_one                                           433     423     -10
raw_do_one                                           494     484     -10
traceroute_main                                     4117    4105     -12
INET_rresolve                                        334     321     -13
bb_displayroutes                                     494     456     -38
snprint_ip_port                                      244       -    -244
static.buff                                          264      16    -248
------------------------------------------------------------------------------
(add/remove: 1/2 grow/shrink: 2/10 up/down: 147/-598)        Total: -451 bytes

size busybox_old busybox_unstripped
   text    data     bss     dec     hex filename
 751073    3048   14688  768809   bbb29 busybox_old
 750873    3048   14440  768361   bb969 busybox_unstripped

6 files changed, 112 insertions, 136 deletions

diff --git a/include/inet_common.h b/include/inet_common.h
index fa48fdf..eb4cb73 100644
--- a/include/inet_common.h
+++ b/include/inet_common.h
@@ -18,9 +18,9 @@ int INET_resolve(const char *name, struct sockaddr_in *s_in, int hostfirst);
  *          & 0x4000: host instead of net,
  *          & 0x0fff: don't resolve
  */
-int INET_rresolve(char *name, size_t len, struct sockaddr_in *s_in,
-	int numeric, unsigned int netmask);
-
 
 int INET6_resolve(const char *name, struct sockaddr_in6 *sin6);
-int INET6_rresolve(char *name, size_t len, struct sockaddr_in6 *sin6, int numeric);
+
+/* These return malloced string */
+char *INET_rresolve(struct sockaddr_in *s_in, int numeric, uint32_t netmask);
+char *INET6_rresolve(struct sockaddr_in6 *sin6, int numeric);
diff --git a/libbb/inet_common.c b/libbb/inet_common.c
index 44b44a4..8449201 100644
--- a/libbb/inet_common.c
+++ b/libbb/inet_common.c
@@ -72,26 +72,24 @@ int INET_resolve(const char *name, struct sockaddr_in *s_in, int hostfirst)
 	return 0;
 }
 
-/* cache */
-struct addr {
-	struct sockaddr_in addr;
-	char *name;
-	int host;
-	struct addr *next;
-};
-
-static struct addr *INET_nn = NULL;	/* addr-to-name cache */
 
 /* numeric: & 0x8000: default instead of *,
  *          & 0x4000: host instead of net,
  *          & 0x0fff: don't resolve
  */
-int INET_rresolve(char *name, size_t len, struct sockaddr_in *s_in,
-				  int numeric, unsigned int netmask)
+char *INET_rresolve(struct sockaddr_in *s_in, int numeric, uint32_t netmask)
 {
-	struct hostent *ent;
-	struct netent *np;
+	/* addr-to-name cache */
+	struct addr {
+		struct addr *next;
+		struct sockaddr_in addr;
+		int host;
+		char name[1];
+	};
+	static struct addr *cache = NULL;
+
 	struct addr *pn;
+	char *name;
 	uint32_t ad, host_ad;
 	int host = 0;
 
@@ -102,7 +100,7 @@ int INET_rresolve(char *name, size_t len, struct sockaddr_in *s_in,
 				  s_in->sin_family);
 #endif
 		errno = EAFNOSUPPORT;
-		return -1;
+		return NULL;
 	}
 	ad = s_in->sin_addr.s_addr;
 #ifdef DEBUG
@@ -111,62 +109,58 @@ int INET_rresolve(char *name, size_t len, struct sockaddr_in *s_in,
 	if (ad == INADDR_ANY) {
 		if ((numeric & 0x0FFF) == 0) {
 			if (numeric & 0x8000)
-				safe_strncpy(name, bb_str_default, len);
-			else
-				safe_strncpy(name, "*", len);
-			return 0;
+				return xstrdup(bb_str_default);
+			return xstrdup("*");
 		}
 	}
-	if (numeric & 0x0FFF) {
-		safe_strncpy(name, inet_ntoa(s_in->sin_addr), len);
-		return 0;
-	}
+	if (numeric & 0x0FFF)
+		return xstrdup(inet_ntoa(s_in->sin_addr));
 
 	if ((ad & (~netmask)) != 0 || (numeric & 0x4000))
 		host = 1;
-	pn = INET_nn;
-	while (pn != NULL) {
+	pn = cache;
+	while (pn) {
 		if (pn->addr.sin_addr.s_addr == ad && pn->host == host) {
-			safe_strncpy(name, pn->name, len);
 #ifdef DEBUG
 			bb_error_msg("rresolve: found %s %08x in cache",
 					  (host ? "host" : "net"), (unsigned)ad);
 #endif
-			return 0;
+			return xstrdup(pn->name);
 		}
 		pn = pn->next;
 	}
 
 	host_ad = ntohl(ad);
-	np = NULL;
-	ent = NULL;
+	name = NULL;
 	if (host) {
+		struct hostent *ent;
 #ifdef DEBUG
 		bb_error_msg("gethostbyaddr (%08x)", (unsigned)ad);
 #endif
 		ent = gethostbyaddr((char *) &ad, 4, AF_INET);
-		if (ent != NULL) {
-			safe_strncpy(name, ent->h_name, len);
-		}
+		if (ent)
+			name = xstrdup(ent->h_name);
 	} else {
+		/* Hmmm... this is very rare to have named nets,
+		 * and this getnetbyaddr() call is the only one in bbox.
+		 * Maybe get rid of or make configurable? */
+		struct netent *np;
 #ifdef DEBUG
 		bb_error_msg("getnetbyaddr (%08x)", (unsigned)host_ad);
 #endif
 		np = getnetbyaddr(host_ad, AF_INET);
-		if (np != NULL) {
-			safe_strncpy(name, np->n_name, len);
-		}
-	}
-	if (!ent && !np) {
-		safe_strncpy(name, inet_ntoa(s_in->sin_addr), len);
+		if (np)
+			name = xstrdup(np->n_name);
 	}
-	pn = xmalloc(sizeof(struct addr));
+	if (!name)
+		name = xstrdup(inet_ntoa(s_in->sin_addr));
+	pn = xmalloc(sizeof(*pn) + strlen(name)); /* no '+ 1', it's already accounted for */
+	pn->next = cache;
 	pn->addr = *s_in;
-	pn->next = INET_nn;
 	pn->host = host;
-	pn->name = xstrdup(name);
-	INET_nn = pn;
-	return 0;
+	strcpy(pn->name, name);
+	cache = pn;
+	return name;
 }
 
 #ifdef CONFIG_FEATURE_IPV6
@@ -195,9 +189,9 @@ int INET6_resolve(const char *name, struct sockaddr_in6 *sin6)
 #endif
 
 
-int INET6_rresolve(char *name, size_t len, struct sockaddr_in6 *sin6,
-				   int numeric)
+char *INET6_rresolve(struct sockaddr_in6 *sin6, int numeric)
 {
+	char name[128];
 	int s;
 
 	/* Grmpf. -FvK */
@@ -207,29 +201,25 @@ int INET6_rresolve(char *name, size_t len, struct sockaddr_in6 *sin6,
 				  sin6->sin6_family);
 #endif
 		errno = EAFNOSUPPORT;
-		return -1;
+		return NULL;
 	}
 	if (numeric & 0x7FFF) {
-		inet_ntop(AF_INET6, &sin6->sin6_addr, name, len);
-		return 0;
+		inet_ntop(AF_INET6, &sin6->sin6_addr, name, sizeof(name));
+		return xstrdup(name);
 	}
 	if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
-		if (numeric & 0x8000) {
-			strcpy(name, bb_str_default);
-		} else {
-			name[0] = '*';
-			name[1] = '\0';
-		}
-		return 0;
+		if (numeric & 0x8000)
+			return xstrdup(bb_str_default);
+		return xstrdup("*");
 	}
 
 	s = getnameinfo((struct sockaddr *) sin6, sizeof(struct sockaddr_in6),
-				name, len, NULL, 0, 0);
+				name, sizeof(name), NULL, 0, 0);
 	if (s) {
 		bb_error_msg("getnameinfo failed");
-		return -1;
+		return NULL;
 	}
-	return 0;
+	return xstrdup(name);
 }
 
 #endif							/* CONFIG_FEATURE_IPV6 */
diff --git a/networking/interface.c b/networking/interface.c
index f8721f4..204febf 100644
--- a/networking/interface.c
+++ b/networking/interface.c
@@ -84,13 +84,12 @@ struct in6_ifreq {
 /* Display an Internet socket address. */
 static const char *INET_sprint(struct sockaddr *sap, int numeric)
 {
-	static char buff[128];
+	static char *buff;
 
+	free(buff);
 	if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
 		return "[NONE SET]";
-	if (INET_rresolve(buff, sizeof(buff), (struct sockaddr_in *) sap,
-					  numeric, 0xffffff00) != 0)
-		return NULL;
+	buff = INET_rresolve((struct sockaddr_in *) sap, numeric, 0xffffff00);
 	return buff;
 }
 
@@ -167,12 +166,12 @@ static const struct aftype inet_aftype = {
 /* dirty! struct sockaddr usually doesn't suffer for inet6 addresses, fst. */
 static const char *INET6_sprint(struct sockaddr *sap, int numeric)
 {
-	static char buff[128];
+	static char *buff;
 
+	free(buff);
 	if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
 		return "[NONE SET]";
-	if (INET6_rresolve(buff, sizeof(buff), (struct sockaddr_in6 *) sap, numeric))
-		return "[UNKNOWN]";
+	buff = INET6_rresolve((struct sockaddr_in6 *) sap, numeric);
 	return buff;
 }
 
diff --git a/networking/netstat.c b/networking/netstat.c
index d6c10b0..746e250 100644
--- a/networking/netstat.c
+++ b/networking/netstat.c
@@ -120,50 +120,33 @@ static void build_ipv4_addr(char* local_addr, struct sockaddr_in* localaddr)
 	((struct sockaddr *) localaddr)->sa_family = AF_INET;
 }
 
-static const char *get_sname(int port, const char *proto, int num)
+static const char *get_sname(int port, const char *proto, int numeric)
 {
-	/* hummm, we return static buffer here!! */
-	const char *str = itoa(ntohs(port));
-	if (!num) {
+	if (!port)
+		return "*";
+	if (!numeric) {
 		struct servent *se = getservbyport(port, proto);
 		if (se)
-			str = se->s_name;
+			return se->s_name;
 	}
-	if (!port) {
-		str = "*";
-	}
-	return str;
+	/* hummm, we may return static buffer here!! */
+	return itoa(ntohs(port));
 }
 
-static void snprint_ip_port(char *ip_port, int size, struct sockaddr *addr, int port, const char *proto, int numeric)
+static char *ip_port_str(struct sockaddr *addr, int port, const char *proto, int numeric)
 {
-	const char *port_name;
-	int max_len;
-	int port_name_len;
+	enum { salen = USE_FEATURE_IPV6(sizeof(struct sockaddr_in6)) SKIP_FEATURE_IPV6(sizeof(struct sockaddr_in)) };
+	char *host, *host_port;
 
-// TODO: replace by xmalloc_sockaddr2host?
-#if ENABLE_FEATURE_IPV6
-	if (addr->sa_family == AF_INET6) {
-		INET6_rresolve(ip_port, size, (struct sockaddr_in6 *)addr,
-			(numeric & NETSTAT_NUMERIC) ? 0x0fff : 0);
-	} else
-#endif
-	{
-		INET_rresolve(ip_port, size, (struct sockaddr_in *)addr,
-			0x4000 | ((numeric & NETSTAT_NUMERIC) ? 0x0fff : 0),
-			0xffffffff);
-	}
-	port_name = get_sname(htons(port), proto, numeric);
-
-	max_len = (option_mask32 & OPT_widedisplay)
-			? (PRINT_IP_MAX_SIZE_WIDE - 1)
-			: (PRINT_IP_MAX_SIZE - 1);
-	port_name_len = strlen(port_name);
-	if ((strlen(ip_port) + port_name_len) > max_len)
-		ip_port[max_len - port_name_len] = '\0';
-	ip_port += strlen(ip_port);
-	*ip_port++ = ':';
-	strcpy(ip_port, port_name);
+	/* Code which used "*" for INADDR_ANY is removed: it's ambiguous in IPv6,
+	 * while "0.0.0.0" is not. */
+
+	host = numeric ? xmalloc_sockaddr2dotted_noport(addr, salen)
+	               : xmalloc_sockaddr2host_noport(addr, salen);
+
+	host_port = xasprintf("%s:%s", host, get_sname(htons(port), proto, numeric));
+	free(host);
+	return host_port;
 }
 
 static void tcp_do_one(int lnr, const char *line)
@@ -206,14 +189,16 @@ static void tcp_do_one(int lnr, const char *line)
 	if ((rem_port && (flags & NETSTAT_CONNECTED))
 	 || (!rem_port && (flags & NETSTAT_LISTENING))
 	) {
-		snprint_ip_port(local_addr, sizeof(local_addr),
+		char *l = ip_port_str(
 				(struct sockaddr *) &localaddr, local_port,
 				"tcp", flags & NETSTAT_NUMERIC);
-		snprint_ip_port(rem_addr, sizeof(rem_addr),
+		char *r = ip_port_str(
 				(struct sockaddr *) &remaddr, rem_port,
 				"tcp", flags & NETSTAT_NUMERIC);
 		printf(net_conn_line,
-			"tcp", rxq, txq, local_addr, rem_addr, tcp_state[state]);
+			"tcp", rxq, txq, l, r, tcp_state[state]);
+		free(l);
+		free(r);
 	}
 }
 
@@ -285,14 +270,16 @@ static void udp_do_one(int lnr, const char *line)
 		if ((have_remaddr && (flags & NETSTAT_CONNECTED))
 		 || (!have_remaddr && (flags & NETSTAT_LISTENING))
 		) {
-			snprint_ip_port(local_addr, sizeof(local_addr),
+			char *l = ip_port_str(
 				(struct sockaddr *) &localaddr, local_port,
 				"udp", flags & NETSTAT_NUMERIC);
-			snprint_ip_port(rem_addr, sizeof(rem_addr),
+			char *r = ip_port_str(
 				(struct sockaddr *) &remaddr, rem_port,
 				"udp", flags & NETSTAT_NUMERIC);
 			printf(net_conn_line,
-				"udp", rxq, txq, local_addr, rem_addr, state_str);
+				"udp", rxq, txq, l, r, state_str);
+			free(l);
+			free(r);
 		}
 	}
 }
@@ -339,14 +326,16 @@ static void raw_do_one(int lnr, const char *line)
 		if ((have_remaddr && (flags & NETSTAT_CONNECTED))
 		 || (!have_remaddr && (flags & NETSTAT_LISTENING))
 		) {
-			snprint_ip_port(local_addr, sizeof(local_addr),
+			char *l = ip_port_str(
 				(struct sockaddr *) &localaddr, local_port,
 				"raw", flags & NETSTAT_NUMERIC);
-			snprint_ip_port(rem_addr, sizeof(rem_addr),
+			char *r = ip_port_str(
 				(struct sockaddr *) &remaddr, rem_port,
 				"raw", flags & NETSTAT_NUMERIC);
 			printf(net_conn_line,
-				"raw", rxq, txq, local_addr, rem_addr, itoa(state));
+				"raw", rxq, txq, l, r, itoa(state));
+			free(l);
+			free(r);
 		}
 	}
 }
diff --git a/networking/route.c b/networking/route.c
index 881332b..b5490dd 100644
--- a/networking/route.c
+++ b/networking/route.c
@@ -478,7 +478,7 @@ static void set_flags(char *flagstr, int flags)
 /* also used in netstat */
 void bb_displayroutes(int noresolve, int netstatfmt)
 {
-	char devname[64], flags[16], sdest[16], sgw[16];
+	char devname[64], flags[16], *sdest, *sgw;
 	unsigned long d, g, m;
 	int flgs, ref, use, metric, mtu, win, ir;
 	struct sockaddr_in s_addr;
@@ -520,15 +520,14 @@ void bb_displayroutes(int noresolve, int netstatfmt)
 		memset(&s_addr, 0, sizeof(struct sockaddr_in));
 		s_addr.sin_family = AF_INET;
 		s_addr.sin_addr.s_addr = d;
-		INET_rresolve(sdest, sizeof(sdest), &s_addr,
-					  (noresolve | 0x8000), m);	/* Default instead of *. */
-
+		sdest = INET_rresolve(&s_addr, (noresolve | 0x8000), m); /* 'default' instead of '*' */
 		s_addr.sin_addr.s_addr = g;
-		INET_rresolve(sgw, sizeof(sgw), &s_addr,
-					  (noresolve | 0x4000), m);	/* Host instead of net. */
-
+		sgw = INET_rresolve(&s_addr, (noresolve | 0x4000), m); /* Host instead of net */
 		mask.s_addr = m;
-		printf("%-16s%-16s%-16s%-6s", sdest, sgw, inet_ntoa(mask), flags);
+		/* "%15.15s" truncates hostnames, do we really want that? */
+		printf("%-15.15s %-15.15s %-16s%-6s", sdest, sgw, inet_ntoa(mask), flags);
+		free(sdest);
+		free(sgw);
 		if (netstatfmt) {
 			printf("%5d %-5d %6d %s\n", mtu, win, ir, devname);
 		} else {
@@ -541,7 +540,7 @@ void bb_displayroutes(int noresolve, int netstatfmt)
 
 static void INET6_displayroutes(int noresolve)
 {
-	char addr6[128], naddr6[128];
+	char addr6[128], *naddr6;
 	/* In addr6x, we store both 40-byte ':'-delimited ipv6 addresses.
 	 * We read the non-delimited strings into the tail of the buffer
 	 * using fscanf and then modify the buffer by shifting forward
@@ -581,7 +580,7 @@ static void INET6_displayroutes(int noresolve)
 
 			do {
 				if (!*p) {
-					if (i==40) { /* nul terminator for 1st address? */
+					if (i == 40) { /* nul terminator for 1st address? */
 						addr6x[39] = 0;	/* Fixup... need 0 instead of ':'. */
 						++p;	/* Skip and continue. */
 						continue;
@@ -606,18 +605,19 @@ static void INET6_displayroutes(int noresolve)
 			inet_pton(AF_INET6, addr6x + r,
 					  (struct sockaddr *) &snaddr6.sin6_addr);
 			snaddr6.sin6_family = AF_INET6;
-			INET6_rresolve(naddr6, sizeof(naddr6),
-						   (struct sockaddr_in6 *) &snaddr6,
+			naddr6 = INET6_rresolve((struct sockaddr_in6 *) &snaddr6,
 						   0x0fff /* Apparently, upstream never resolves. */
 						   );
 
 			if (!r) {			/* 1st pass */
 				snprintf(addr6, sizeof(addr6), "%s/%d", naddr6, prefix_len);
 				r += 40;
+				free(naddr6);
 			} else {			/* 2nd pass */
 				/* Print the info. */
 				printf("%-43s %-39s %-5s %-6d %-2d %7d %-8s\n",
-						  addr6, naddr6, flags, metric, refcnt, use, iface);
+						addr6, naddr6, flags, metric, refcnt, use, iface);
+				free(naddr6);
 				break;
 			}
 		} while (1);
diff --git a/networking/traceroute.c b/networking/traceroute.c
index 9fc15d3..577738a 100644
--- a/networking/traceroute.c
+++ b/networking/traceroute.c
@@ -802,22 +802,20 @@ packet_ok(unsigned char *buf, int cc, struct sockaddr_in *from, int seq)
  * numeric value, otherwise try for symbolic name.
  */
 static inline void
-inetname(struct sockaddr_in *from)
+print_inetname(struct sockaddr_in *from)
 {
-	const char *n = NULL;
 	const char *ina;
-	char name[257];
 
-	if (!nflag && from->sin_addr.s_addr != INADDR_ANY) {
-		if (INET_rresolve(name, sizeof(name), from, 0x4000,
-						0xffffffff) >= 0)
-			n = name;
-	}
 	ina = inet_ntoa(from->sin_addr);
 	if (nflag)
 		printf(" %s", ina);
-	else
+	else {
+		char *n = NULL;
+		if (from->sin_addr.s_addr != INADDR_ANY)
+			n = xmalloc_sockaddr2host_noport((struct sockaddr*)from, sizeof(*from));
 		printf(" %s (%s)", (n ? n : ina), ina);
+		free(n);
+	}
 }
 
 static inline void
@@ -830,7 +828,7 @@ print(unsigned char *buf, int cc, struct sockaddr_in *from)
 	hlen = ip->ip_hl << 2;
 	cc -= hlen;
 
-	inetname(from);
+	print_inetname(from);
 #if ENABLE_FEATURE_TRACEROUTE_VERBOSE
 	if (verbose)
 		printf(" %d bytes to %s", cc, inet_ntoa(ip->ip_dst));