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-rw-r--r--include/inet_common.h8
-rw-r--r--libbb/inet_common.c104
-rw-r--r--networking/interface.c13
-rw-r--r--networking/netstat.c79
-rw-r--r--networking/route.c26
-rw-r--r--networking/traceroute.c18
6 files changed, 112 insertions, 136 deletions
diff --git a/include/inet_common.h b/include/inet_common.h
index fa48fdffa..eb4cb7325 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 44b44a4cc..8449201ab 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 f8721f409..204febf7d 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 d6c10b07b..746e25091 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 881332b9f..b5490ddd8 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 9fc15d390..577738a97 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));
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-12 12:13:32 +0000