From 5a7eb67e30594b1b96c679cfe41336aaf5815d93 Mon Sep 17 00:00:00 2001
From: vda <vda@69ca8d6d-28ef-0310-b511-8ec308f3f277>
Date: Thu, 15 Mar 2007 19:46:43 +0000
Subject: networking/interface.c: was doing really strange caching of fd's open
for getting ifconfig data - ??! Simplified all that. -200 bytes.
git-svn-id: svn://busybox.net/trunk/busybox@18120 69ca8d6d-28ef-0310-b511-8ec308f3f277
---
include/libbb.h | 7 +-
networking/interface.c | 311 ++++++++++++++++++-------------------------------
2 files changed, 113 insertions(+), 205 deletions(-)
diff --git a/include/libbb.h b/include/libbb.h
index 9a6966dbd..90fb0ad91 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -137,9 +137,6 @@ struct aftype {
/* may modify src */
int (*getmask) (char *src, struct sockaddr * mask, char *name);
-
- int fd;
- char *flag_file;
};
/* This structure defines hardware protocols and their handlers. */
@@ -530,11 +527,9 @@ int bbunpack(char **argv,
int create_icmp_socket(void);
int create_icmp6_socket(void);
/* interface.c */
-struct aftype;
-struct hwtype;
extern int interface_opt_a;
int display_interfaces(char *ifname);
-struct aftype *get_aftype(const char *name);
+const struct aftype *get_aftype(const char *name);
const struct hwtype *get_hwtype(const char *name);
const struct hwtype *get_hwntype(int type);
diff --git a/networking/interface.c b/networking/interface.c
index 262b97879..2c5f3284e 100644
--- a/networking/interface.c
+++ b/networking/interface.c
@@ -36,7 +36,7 @@
#include "inet_common.h"
#include "busybox.h"
-#ifdef CONFIG_FEATURE_IPV6
+#if ENABLE_FEATURE_IPV6
# define HAVE_AFINET6 1
#else
# undef HAVE_AFINET6
@@ -154,14 +154,13 @@ static int INET_input(/*int type,*/ const char *bufp, struct sockaddr *sap)
*/
}
-static struct aftype inet_aftype = {
+static const struct aftype inet_aftype = {
.name = "inet",
.title = "DARPA Internet",
.af = AF_INET,
.alen = 4,
.sprint = INET_sprint,
.input = INET_input,
- .fd = -1
};
#ifdef HAVE_AFINET6
@@ -208,14 +207,13 @@ static int INET6_input(/*int type,*/ const char *bufp, struct sockaddr *sap)
*/
}
-static struct aftype inet6_aftype = {
+static const struct aftype inet6_aftype = {
.name = "inet6",
.title = "IPv6",
.af = AF_INET6,
.alen = sizeof(struct in6_addr),
.sprint = INET6_sprint,
.input = INET6_input,
- .fd = -1
};
#endif /* HAVE_AFINET6 */
@@ -246,13 +244,16 @@ static const char *UNSPEC_sprint(struct sockaddr *sap, int numeric)
return UNSPEC_print((unsigned char *)sap->sa_data);
}
-static struct aftype unspec_aftype = {
- "unspec", "UNSPEC", AF_UNSPEC, 0,
- UNSPEC_print, UNSPEC_sprint, NULL, NULL,
- NULL,
+static const struct aftype unspec_aftype = {
+ .name = "unspec",
+ .title = "UNSPEC",
+ .af = AF_UNSPEC,
+ .alen = 0,
+ .print = UNSPEC_print,
+ .sprint = UNSPEC_sprint,
};
-static struct aftype * const aftypes[] = {
+static const struct aftype *const aftypes[] = {
&inet_aftype,
#ifdef HAVE_AFINET6
&inet6_aftype,
@@ -262,9 +263,9 @@ static struct aftype * const aftypes[] = {
};
/* Check our protocol family table for this family. */
-struct aftype *get_aftype(const char *name)
+const struct aftype *get_aftype(const char *name)
{
- struct aftype * const *afp;
+ const struct aftype *const *afp;
afp = aftypes;
while (*afp != NULL) {
@@ -276,9 +277,9 @@ struct aftype *get_aftype(const char *name)
}
/* Check our protocol family table for this family. */
-static struct aftype *get_afntype(int af)
+static const struct aftype *get_afntype(int af)
{
- struct aftype * const *afp;
+ const struct aftype *const *afp;
afp = aftypes;
while (*afp != NULL) {
@@ -289,20 +290,6 @@ static struct aftype *get_afntype(int af)
return NULL;
}
-/* Check our protocol family table for this family and return its socket */
-static int get_socket_for_af(int af)
-{
- struct aftype * const *afp;
-
- afp = aftypes;
- while (*afp != NULL) {
- if ((*afp)->af == af)
- return (*afp)->fd;
- afp++;
- }
- return -1;
-}
-
struct user_net_device_stats {
unsigned long long rx_packets; /* total packets received */
unsigned long long tx_packets; /* total packets transmitted */
@@ -357,62 +344,8 @@ struct interface {
int interface_opt_a; /* show all interfaces */
static struct interface *int_list, *int_last;
-static int skfd = -1; /* generic raw socket desc. */
-
-
-static int sockets_open(int family)
-{
- struct aftype * const *aft;
- int sfd = -1;
- static int force = -1;
-
- if (force < 0) {
- force = 0;
- if (get_linux_version_code() < KERNEL_VERSION(2,1,0))
- force = 1;
- if (access("/proc/net", R_OK))
- force = 1;
- }
- for (aft = aftypes; *aft; aft++) {
- struct aftype *af = *aft;
- int type = SOCK_DGRAM;
- if (af->af == AF_UNSPEC)
- continue;
- if (family && family != af->af)
- continue;
- if (af->fd != -1) {
- sfd = af->fd;
- continue;
- }
- /* Check some /proc file first to not stress kmod */
- if (!family && !force && af->flag_file) {
- if (access(af->flag_file, R_OK))
- continue;
- }
- af->fd = socket(af->af, type, 0);
- if (af->fd >= 0)
- sfd = af->fd;
- }
- if (sfd < 0) {
- bb_error_msg("no usable address families found");
- }
- return sfd;
-}
-#ifdef CONFIG_FEATURE_CLEAN_UP
-static void sockets_close(void)
-{
- struct aftype * const *aft;
- for (aft = aftypes; *aft != NULL; aft++) {
- struct aftype *af = *aft;
- if( af->fd != -1 ) {
- close(af->fd);
- af->fd = -1;
- }
- }
-}
-#endif
#if 0
/* like strcmp(), but knows about numbers */
except that the freshly added calls to xatoul() brf on ethernet aliases with
@@ -467,55 +400,6 @@ static struct interface *add_interface(char *name)
return new;
}
-
-static int if_readconf(void)
-{
- int numreqs = 30;
- struct ifconf ifc;
- struct ifreq *ifr;
- int n, err = -1;
- int skfd2;
-
- /* SIOCGIFCONF currently seems to only work properly on AF_INET sockets
- (as of 2.1.128) */
- skfd2 = get_socket_for_af(AF_INET);
- if (skfd2 < 0) {
- bb_perror_msg(("warning: no inet socket available"));
- /* Try to soldier on with whatever socket we can get hold of. */
- skfd2 = sockets_open(0);
- if (skfd2 < 0)
- return -1;
- }
-
- ifc.ifc_buf = NULL;
- for (;;) {
- ifc.ifc_len = sizeof(struct ifreq) * numreqs;
- ifc.ifc_buf = xrealloc(ifc.ifc_buf, ifc.ifc_len);
-
- if (ioctl(skfd2, SIOCGIFCONF, &ifc) < 0) {
- perror("SIOCGIFCONF");
- goto out;
- }
- if (ifc.ifc_len == sizeof(struct ifreq) * numreqs) {
- /* assume it overflowed and try again */
- numreqs += 10;
- continue;
- }
- break;
- }
-
- ifr = ifc.ifc_req;
- for (n = 0; n < ifc.ifc_len; n += sizeof(struct ifreq)) {
- add_interface(ifr->ifr_name);
- ifr++;
- }
- err = 0;
-
- out:
- free(ifc.ifc_buf);
- return err;
-}
-
static char *get_name(char *name, char *p)
{
/* Extract <name> from nul-terminated p where p matches
@@ -550,7 +434,7 @@ static char *get_name(char *name, char *p)
* old approach of multiple scanf occurrences with large numbers of
* args. */
-/* static const char * const ss_fmt[] = { */
+/* static const char *const ss_fmt[] = { */
/* "%lln%llu%lu%lu%lu%lu%ln%ln%lln%llu%lu%lu%lu%lu%lu", */
/* "%llu%llu%lu%lu%lu%lu%ln%ln%llu%llu%lu%lu%lu%lu%lu", */
/* "%llu%llu%lu%lu%lu%lu%lu%lu%llu%llu%lu%lu%lu%lu%lu%lu" */
@@ -558,13 +442,13 @@ static char *get_name(char *name, char *p)
/* Lie about the size of the int pointed to for %n. */
#if INT_MAX == LONG_MAX
-static const char * const ss_fmt[] = {
+static const char *const ss_fmt[] = {
"%n%llu%u%u%u%u%n%n%n%llu%u%u%u%u%u",
"%llu%llu%u%u%u%u%n%n%llu%llu%u%u%u%u%u",
"%llu%llu%u%u%u%u%u%u%llu%llu%u%u%u%u%u%u"
};
#else
-static const char * const ss_fmt[] = {
+static const char *const ss_fmt[] = {
"%n%llu%lu%lu%lu%lu%n%n%n%llu%lu%lu%lu%lu%lu",
"%llu%llu%lu%lu%lu%lu%n%n%llu%llu%lu%lu%lu%lu%lu",
"%llu%llu%lu%lu%lu%lu%lu%lu%llu%llu%lu%lu%lu%lu%lu%lu"
@@ -615,6 +499,54 @@ static inline int procnetdev_version(char *buf)
return 0;
}
+/* Used only if "/proc/net/dev" isn't available */
+static int if_readconf(void)
+{
+ int numreqs = 30;
+ struct ifconf ifc;
+ struct ifreq *ifr;
+ int n, err = -1;
+ int skfd;
+
+ ifc.ifc_buf = NULL;
+
+ /* SIOCGIFCONF currently seems to only work properly on AF_INET sockets
+ (as of 2.1.128) */
+ skfd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (skfd < 0) {
+ bb_perror_msg("error: no inet socket available");
+ return -1;
+ }
+
+ for (;;) {
+ ifc.ifc_len = sizeof(struct ifreq) * numreqs;
+ ifc.ifc_buf = xrealloc(ifc.ifc_buf, ifc.ifc_len);
+
+ if (ioctl(skfd, SIOCGIFCONF, &ifc) < 0) {
+ perror("SIOCGIFCONF");
+ goto out;
+ }
+ if (ifc.ifc_len == sizeof(struct ifreq) * numreqs) {
+ /* assume it overflowed and try again */
+ numreqs += 10;
+ continue;
+ }
+ break;
+ }
+
+ ifr = ifc.ifc_req;
+ for (n = 0; n < ifc.ifc_len; n += sizeof(struct ifreq)) {
+ add_interface(ifr->ifr_name);
+ ifr++;
+ }
+ err = 0;
+
+ out:
+ close(skfd);
+ free(ifc.ifc_buf);
+ return err;
+}
+
static int if_readlist_proc(char *target)
{
static int proc_read;
@@ -660,11 +592,7 @@ static int if_readlist_proc(char *target)
static int if_readlist(void)
{
- int err = if_readlist_proc(NULL);
-
- if (!err)
- err = if_readconf();
- return err;
+ return if_readlist_proc(NULL);
}
static int for_all_interfaces(int (*doit) (struct interface *, void *),
@@ -687,81 +615,74 @@ static int for_all_interfaces(int (*doit) (struct interface *, void *),
static int if_fetch(struct interface *ife)
{
struct ifreq ifr;
- int fd;
char *ifname = ife->name;
+ int skfd;
+
+ skfd = xsocket(AF_INET, SOCK_DGRAM, 0);
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
- if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0)
+ if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0) {
+ close(skfd);
return -1;
+ }
ife->flags = ifr.ifr_flags;
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
- if (ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
- memset(ife->hwaddr, 0, 32);
- else
+ memset(ife->hwaddr, 0, 32);
+ if (ioctl(skfd, SIOCGIFHWADDR, &ifr) >= 0)
memcpy(ife->hwaddr, ifr.ifr_hwaddr.sa_data, 8);
ife->type = ifr.ifr_hwaddr.sa_family;
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
- if (ioctl(skfd, SIOCGIFMETRIC, &ifr) < 0)
- ife->metric = 0;
- else
+ ife->metric = 0;
+ if (ioctl(skfd, SIOCGIFMETRIC, &ifr) >= 0)
ife->metric = ifr.ifr_metric;
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
- if (ioctl(skfd, SIOCGIFMTU, &ifr) < 0)
- ife->mtu = 0;
- else
+ ife->mtu = 0;
+ if (ioctl(skfd, SIOCGIFMTU, &ifr) >= 0)
ife->mtu = ifr.ifr_mtu;
+ memset(&ife->map, 0, sizeof(struct ifmap));
#ifdef SIOCGIFMAP
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
if (ioctl(skfd, SIOCGIFMAP, &ifr) == 0)
ife->map = ifr.ifr_map;
- else
#endif
- memset(&ife->map, 0, sizeof(struct ifmap));
#ifdef HAVE_TXQUEUELEN
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
- if (ioctl(skfd, SIOCGIFTXQLEN, &ifr) < 0)
- ife->tx_queue_len = -1; /* unknown value */
- else
+ ife->tx_queue_len = -1; /* unknown value */
+ if (ioctl(skfd, SIOCGIFTXQLEN, &ifr) >= 0)
ife->tx_queue_len = ifr.ifr_qlen;
#else
ife->tx_queue_len = -1; /* unknown value */
#endif
- /* IPv4 address? */
- fd = get_socket_for_af(AF_INET);
- if (fd >= 0) {
+ strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+ ifr.ifr_addr.sa_family = AF_INET;
+ memset(&ife->addr, 0, sizeof(struct sockaddr));
+ if (ioctl(skfd, SIOCGIFADDR, &ifr) == 0) {
+ ife->has_ip = 1;
+ ife->addr = ifr.ifr_addr;
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
- ifr.ifr_addr.sa_family = AF_INET;
- if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
- ife->has_ip = 1;
- ife->addr = ifr.ifr_addr;
- strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
- if (ioctl(fd, SIOCGIFDSTADDR, &ifr) < 0)
- memset(&ife->dstaddr, 0, sizeof(struct sockaddr));
- else
- ife->dstaddr = ifr.ifr_dstaddr;
-
- strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
- if (ioctl(fd, SIOCGIFBRDADDR, &ifr) < 0)
- memset(&ife->broadaddr, 0, sizeof(struct sockaddr));
- else
- ife->broadaddr = ifr.ifr_broadaddr;
-
- strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
- if (ioctl(fd, SIOCGIFNETMASK, &ifr) < 0)
- memset(&ife->netmask, 0, sizeof(struct sockaddr));
- else
- ife->netmask = ifr.ifr_netmask;
- } else
- memset(&ife->addr, 0, sizeof(struct sockaddr));
+ memset(&ife->dstaddr, 0, sizeof(struct sockaddr));
+ if (ioctl(skfd, SIOCGIFDSTADDR, &ifr) >= 0)
+ ife->dstaddr = ifr.ifr_dstaddr;
+
+ strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+ memset(&ife->broadaddr, 0, sizeof(struct sockaddr));
+ if (ioctl(skfd, SIOCGIFBRDADDR, &ifr) >= 0)
+ ife->broadaddr = ifr.ifr_broadaddr;
+
+ strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+ memset(&ife->netmask, 0, sizeof(struct sockaddr));
+ if (ioctl(skfd, SIOCGIFNETMASK, &ifr) >= 0)
+ ife->netmask = ifr.ifr_netmask;
}
+ close(skfd);
return 0;
}
@@ -887,7 +808,7 @@ static const struct hwtype ppp_hwtype = {
.type = ARPHRD_PPP
};
-#ifdef CONFIG_FEATURE_IPV6
+#if ENABLE_FEATURE_IPV6
static const struct hwtype sit_hwtype = {
.name = "sit",
.title = "IPv6-in-IPv4",
@@ -897,19 +818,19 @@ static const struct hwtype sit_hwtype = {
} ;
#endif
-static const struct hwtype * const hwtypes[] = {
+static const struct hwtype *const hwtypes[] = {
&loop_hwtype,
ðer_hwtype,
&ppp_hwtype,
&unspec_hwtype,
-#ifdef CONFIG_FEATURE_IPV6
+#if ENABLE_FEATURE_IPV6
&sit_hwtype,
#endif
NULL
};
#ifdef IFF_PORTSEL
-static const char * const if_port_text[] = {
+static const char *const if_port_text[] = {
/* Keep in step with <linux/netdevice.h> */
"unknown",
"10base2",
@@ -925,7 +846,7 @@ static const char * const if_port_text[] = {
/* Check our hardware type table for this type. */
const struct hwtype *get_hwtype(const char *name)
{
- const struct hwtype * const *hwp;
+ const struct hwtype *const *hwp;
hwp = hwtypes;
while (*hwp != NULL) {
@@ -939,7 +860,7 @@ const struct hwtype *get_hwtype(const char *name)
/* Check our hardware type table for this type. */
const struct hwtype *get_hwntype(int type)
{
- const struct hwtype * const *hwp;
+ const struct hwtype *const *hwp;
hwp = hwtypes;
while (*hwp != NULL) {
@@ -987,7 +908,7 @@ static void print_bytes_scaled(unsigned long long ull, const char *end)
printf("X bytes:%llu (%llu.%u %sB)%s", ull, int_part, frac_part, ext, end);
}
-static const char * const ife_print_flags_strs[] = {
+static const char *const ife_print_flags_strs[] = {
"UP ",
"BROADCAST ",
"DEBUG ",
@@ -1028,7 +949,7 @@ static const unsigned short ife_print_flags_mask[] = {
static void ife_print(struct interface *ptr)
{
- struct aftype *ap;
+ const struct aftype *ap;
const struct hwtype *hw;
int hf;
int can_compress = 0;
@@ -1265,15 +1186,7 @@ int display_interfaces(char *ifname)
{
int status;
- /* Create a channel to the NET kernel. */
- if ((skfd = sockets_open(0)) < 0) {
- bb_perror_msg_and_die("socket");
- }
-
- /* Do we have to show the current setup? */
status = if_print(ifname);
-#ifdef CONFIG_FEATURE_CLEAN_UP
- sockets_close();
-#endif
- exit(status < 0);
+
+ return (status < 0); /* status < 0 == 1 -- error */
}
--
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