interface.c

ifconfig源码

    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)
{
    while (isspace(*p))
	p++;
    while (*p) {
	if (isspace(*p))
	    break;
	if (*p == ':') {	/* could be an alias */
	    char *dot = p, *dotname = name;
	    *name++ = *p++;
	    while (isdigit(*p))
		*name++ = *p++;
	    if (*p != ':') {	/* it wasn't, backup */
		p = dot;
		name = dotname;
	    }
	    if (*p == '\0')
		return NULL;
	    p++;
	    break;
	}
	*name++ = *p++;
    }
    *name++ = '\0';
    return p;
}

static int get_dev_fields(char *bp, struct interface *ife)
{
    switch (procnetdev_vsn) {
    case 3:
	sscanf(bp,
	"%Lu %Lu %lu %lu %lu %lu %lu %lu %Lu %Lu %lu %lu %lu %lu %lu %lu",
	       &ife->stats.rx_bytes,
	       &ife->stats.rx_packets,
	       &ife->stats.rx_errors,
	       &ife->stats.rx_dropped,
	       &ife->stats.rx_fifo_errors,
	       &ife->stats.rx_frame_errors,
	       &ife->stats.rx_compressed,
	       &ife->stats.rx_multicast,

	       &ife->stats.tx_bytes,
	       &ife->stats.tx_packets,
	       &ife->stats.tx_errors,
	       &ife->stats.tx_dropped,
	       &ife->stats.tx_fifo_errors,
	       &ife->stats.collisions,
	       &ife->stats.tx_carrier_errors,
	       &ife->stats.tx_compressed);
	break;
    case 2:
	sscanf(bp, "%Lu %Lu %lu %lu %lu %lu %Lu %Lu %lu %lu %lu %lu %lu",
	       &ife->stats.rx_bytes,
	       &ife->stats.rx_packets,
	       &ife->stats.rx_errors,
	       &ife->stats.rx_dropped,
	       &ife->stats.rx_fifo_errors,
	       &ife->stats.rx_frame_errors,

	       &ife->stats.tx_bytes,
	       &ife->stats.tx_packets,
	       &ife->stats.tx_errors,
	       &ife->stats.tx_dropped,
	       &ife->stats.tx_fifo_errors,
	       &ife->stats.collisions,
	       &ife->stats.tx_carrier_errors);
	ife->stats.rx_multicast = 0;
	break;
    case 1:
	sscanf(bp, "%Lu %lu %lu %lu %lu %Lu %lu %lu %lu %lu %lu",
	       &ife->stats.rx_packets,
	       &ife->stats.rx_errors,
	       &ife->stats.rx_dropped,
	       &ife->stats.rx_fifo_errors,
	       &ife->stats.rx_frame_errors,

	       &ife->stats.tx_packets,
	       &ife->stats.tx_errors,
	       &ife->stats.tx_dropped,
	       &ife->stats.tx_fifo_errors,
	       &ife->stats.collisions,
	       &ife->stats.tx_carrier_errors);
	ife->stats.rx_bytes = 0;
	ife->stats.tx_bytes = 0;
	ife->stats.rx_multicast = 0;
	break;
    }
    return 0;
}

static inline int procnetdev_version(char *buf)
{
    if (strstr(buf, "compressed"))
	return 3;
    if (strstr(buf, "bytes"))
	return 2;
    return 1;
}

static int if_readlist_proc(char *target)
{
    static int proc_read; 
    FILE *fh;
    char buf[512];
    struct interface *ife;
    int err;

    if (proc_read) 
	    return 0; 
    if (!target) 
	    proc_read = 1;

    fh = fopen(_PATH_PROCNET_DEV, "r");
    if (!fh) {
		fprintf(stderr, _("Warning: cannot open %s (%s). Limited output.\n"),
			_PATH_PROCNET_DEV, strerror(errno)); 
		return if_readconf();
	}	
    fgets(buf, sizeof buf, fh);	/* eat line */
    fgets(buf, sizeof buf, fh);

    procnetdev_vsn = procnetdev_version(buf);

    err = 0;
    while (fgets(buf, sizeof buf, fh)) {
	char *s, name[IFNAMSIZ];
	s = get_name(name, buf);    
	ife = add_interface(name);
	get_dev_fields(s, ife);
	ife->statistics_valid = 1;
	if (target && !strcmp(target,name))
		break;
    }
    if (ferror(fh)) {
	perror(_PATH_PROCNET_DEV);
	err = -1;
	proc_read = 0; 
    }

    fclose(fh);
    return err;
}

static int if_readlist(void) 
{ 
    int err = if_readlist_proc(NULL); 
    if (!err)
	    err = if_readconf();
    return err;
} 

static int for_all_interfaces(int (*doit) (struct interface *, void *), void *cookie)
{
    struct interface *ife;

    if (!int_list && (if_readlist() < 0))
	return -1;
    for (ife = int_list; ife; ife = ife->next) {
	int err = doit(ife, cookie);
	if (err)
	    return err;
    }
    return 0;
}

/* Support for fetching an IPX address */

#if HAVE_AFIPX
static int ipx_getaddr(int sock, int ft, struct ifreq *ifr)
{
    ((struct sockaddr_ipx *) &ifr->ifr_addr)->sipx_type = ft;
    return ioctl(sock, SIOCGIFADDR, ifr);
}
#endif


/* Fetch the interface configuration from the kernel. */
static int if_fetch(struct interface *ife)
{
    struct ifreq ifr;
    int fd;
    char *ifname = ife->name; 

    strcpy(ifr.ifr_name, ifname);
    if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0)
	return (-1);
    ife->flags = ifr.ifr_flags;

    strcpy(ifr.ifr_name, ifname);
    if (ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
	memset(ife->hwaddr, 0, 32);
    else
	memcpy(ife->hwaddr, ifr.ifr_hwaddr.sa_data, 8);

    ife->type = ifr.ifr_hwaddr.sa_family;

    strcpy(ifr.ifr_name, ifname);
    if (ioctl(skfd, SIOCGIFMETRIC, &ifr) < 0)
	ife->metric = 0;
    else
	ife->metric = ifr.ifr_metric;

    strcpy(ifr.ifr_name, ifname);
    if (ioctl(skfd, SIOCGIFMTU, &ifr) < 0)
	ife->mtu = 0;
    else
	ife->mtu = ifr.ifr_mtu;

#ifdef HAVE_HWSLIP
    if (ife->type == ARPHRD_SLIP || ife->type == ARPHRD_CSLIP ||
	ife->type == ARPHRD_SLIP6 || ife->type == ARPHRD_CSLIP6 ||
	ife->type == ARPHRD_ADAPT) {
#ifdef SIOCGOUTFILL
	strcpy(ifr.ifr_name, ifname);
	if (ioctl(skfd, SIOCGOUTFILL, &ifr) < 0)
	    ife->outfill = 0;
	else
	    ife->outfill = (unsigned int) ifr.ifr_data;
#endif
#ifdef SIOCGKEEPALIVE
	strcpy(ifr.ifr_name, ifname);
	if (ioctl(skfd, SIOCGKEEPALIVE, &ifr) < 0)
	    ife->keepalive = 0;
	else
	    ife->keepalive = (unsigned int) ifr.ifr_data;
#endif
    }
#endif

    strcpy(ifr.ifr_name, ifname);
    if (ioctl(skfd, SIOCGIFMAP, &ifr) < 0)
	memset(&ife->map, 0, sizeof(struct ifmap));
    else
	memcpy(&ife->map, &ifr.ifr_map, sizeof(struct ifmap));

    strcpy(ifr.ifr_name, ifname);
    if (ioctl(skfd, SIOCGIFMAP, &ifr) < 0)
	memset(&ife->map, 0, sizeof(struct ifmap));
    else
	ife->map = ifr.ifr_map;

#ifdef HAVE_TXQUEUELEN
    strcpy(ifr.ifr_name, ifname);
    if (ioctl(skfd, SIOCGIFTXQLEN, &ifr) < 0)
	ife->tx_queue_len = -1;	/* unknown value */
    else
	ife->tx_queue_len = ifr.ifr_qlen;
#else
    ife->tx_queue_len = -1;	/* unknown value */
#endif

#if HAVE_AFINET
    /* IPv4 address? */
    fd = get_socket_for_af(AF_INET);
    if (fd >= 0) {
	strcpy(ifr.ifr_name, ifname);
	ifr.ifr_addr.sa_family = AF_INET;
	if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
	    ife->has_ip = 1;
	    ife->addr = ifr.ifr_addr;
	    strcpy(ifr.ifr_name, ifname);
	    if (ioctl(fd, SIOCGIFDSTADDR, &ifr) < 0)
	        memset(&ife->dstaddr, 0, sizeof(struct sockaddr));
	    else
	        ife->dstaddr = ifr.ifr_dstaddr;

	    strcpy(ifr.ifr_name, ifname);
	    if (ioctl(fd, SIOCGIFBRDADDR, &ifr) < 0)
	        memset(&ife->broadaddr, 0, sizeof(struct sockaddr));
	    else
		ife->broadaddr = ifr.ifr_broadaddr;

	    strcpy(ifr.ifr_name, ifname);
	    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));
    }
#endif

#if HAVE_AFATALK
    /* DDP address maybe ? */
    fd = get_socket_for_af(AF_APPLETALK);
    if (fd >= 0) {
	strcpy(ifr.ifr_name, ifname);
	if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
	    ife->ddpaddr = ifr.ifr_addr;
	    ife->has_ddp = 1;
	}
    }
#endif

#if HAVE_AFIPX
    /* Look for IPX addresses with all framing types */
    fd = get_socket_for_af(AF_IPX);
    if (fd >= 0) {
	strcpy(ifr.ifr_name, ifname);
	if (!ipx_getaddr(fd, IPX_FRAME_ETHERII, &ifr)) {
	    ife->has_ipx_bb = 1;
	    ife->ipxaddr_bb = ifr.ifr_addr;
	}
	strcpy(ifr.ifr_name, ifname);
	if (!ipx_getaddr(fd, IPX_FRAME_SNAP, &ifr)) {
	    ife->has_ipx_sn = 1;
	    ife->ipxaddr_sn = ifr.ifr_addr;
	}
	strcpy(ifr.ifr_name, ifname);
	if (!ipx_getaddr(fd, IPX_FRAME_8023, &ifr)) {
	    ife->has_ipx_e3 = 1;
	    ife->ipxaddr_e3 = ifr.ifr_addr;
	}
	strcpy(ifr.ifr_name, ifname);
	if (!ipx_getaddr(fd, IPX_FRAME_8022, &ifr)) {
	    ife->has_ipx_e2 = 1;
	    ife->ipxaddr_e2 = ifr.ifr_addr;
	}
    }
#endif

#if HAVE_AFECONET
    /* Econet address maybe? */
    fd = get_socket_for_af(AF_ECONET);
    if (fd >= 0) {
	strcpy(ifr.ifr_name, ifname);
	if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
	    ife->ecaddr = ifr.ifr_addr;
	    ife->has_econet = 1;
	}
    }
#endif

    return 0;
}


static int do_if_fetch(struct interface *ife)
{ 
    if (if_fetch(ife) < 0) {
	char *errmsg; 
	if (errno == ENODEV) { 
	    /* Give better error message for this case. */ 
	    errmsg = _("Device not found"); 
	} else { 
	    errmsg = strerror(errno); 
	}
  	fprintf(stderr, _("%s: error fetching interface information: %s\n"),
		ife->name, errmsg);
	return -1;
    }
    return 0; 
}

/* This structure defines hardware protocols and their handlers. */
struct hwtype {
    const char *name;
    const char *title;
    int type;
    int alen;
    char *(*print) (unsigned char *);
    int (*input) (char *, struct sockaddr *);
    int (*activate) (int fd);
    int suppress_null_addr;
};

/* Display an UNSPEC address. */
static char *pr_unspec(unsigned char *ptr)
{
    static char buff[64];
    char *pos;
    unsigned int i;

    pos = buff;
    for (i = 0; i < sizeof(struct sockaddr); i++) {
	pos += sprintf(pos, "%02X-", (*ptr++ & 0377));
    }
    buff[strlen(buff) - 1] = '\0';
    return (buff);
}

static struct hwtype unspec_hwtype =
{
    "unspec", "UNSPEC", -1, 0,
    pr_unspec, NULL, NULL
};

static struct hwtype loop_hwtype =
{
    "loop", "Local Loopback", ARPHRD_LOOPBACK, 0,
    NULL, NULL, NULL
};

#if HAVE_HWETHER
#include <net/if_arp.h>
#include <linux/if_ether.h>

static struct hwtype ether_hwtype;

/* Display an Ethernet address in readable format. */
static char *pr_ether(unsigned char *ptr)
{
    static char buff[64];

    snprintf(buff, sizeof(buff), "%02X:%02X:%02X:%02X:%02X:%02X",
	     (ptr[0] & 0377), (ptr[1] & 0377), (ptr[2] & 0377),
	     (ptr[3] & 0377), (ptr[4] & 0377), (ptr[5] & 0377)
	);
    return (buff);
}

#ifdef KEEP_UNUSED
/* Input an Ethernet address and convert to binary. */
static int in_ether(char *bufp, struct sockaddr *sap)
{
    unsigned char *ptr;
    char c, *orig;
    int i;
    unsigned val;

    sap->sa_family = ether_hwtype.type;
    ptr = sap->sa_data;

    i = 0;
    orig = bufp;
    while ((*bufp != '\0') && (i < ETH_ALEN)) {
	val = 0;
	c = *bufp++;
	if (isdigit(c))
	    val = c - '0';
	else if (c >= 'a' && c <= 'f')
	    val = c - 'a' + 10;
	else if (c >= 'A' && c <= 'F')
	    val = c - 'A' + 10;
	else {
#ifdef DEBUG
	    fprintf(stderr, _("in_ether(%s): invalid ether address!\n"), orig);
#endif
	    errno = EINVAL;
	    return (-1);
	}
	val <<= 4;
	c = *bufp;
	if (isdigit(c))
	    val |= c - '0';
	else if (c >= 'a' && c <= 'f')
	    val |= c - 'a' + 10;
	else if (c >= 'A' && c <= 'F')
	    val |= c - 'A' + 10;
	else if (c == ':' || c == 0)
	    val >>= 4;
	else {
#ifdef DEBUG
	    fprintf(stderr, _("in_ether(%s): invalid ether address!\n"), orig);
#endif
	    errno = EINVAL;
	    return (-1);
	}
	if (c != 0)
	    bufp++;
	*ptr++ = (unsigned char) (val & 0377);
	i++;

	/* We might get a semicolon here - not required. */
	if (*bufp == ':') {
	    if (i == ETH_ALEN) {
#ifdef DEBUG
		fprintf(stderr, _("in_ether(%s): trailing : ignored!\n"),
			orig)
#endif
		    ;		/* nothing */
	    }
	    bufp++;
	}
    }

    /* That's it.  Any trailing junk? */
    if ((i == ETH_ALEN) && (*bufp != '\0')) {
#ifdef DEBUG
	fprintf(stderr, _("in_ether(%s): trailing junk!\n"), orig);
	errno = EINVAL;
	return (-1);
#endif
    }
#ifdef DEBUG
    fprintf(stderr, "in_ether(%s): %s\n", orig, pr_ether(sap->sa_data));
#endif

    return (0);
}
#endif /* KEEP_UNUSED */


static struct hwtype ether_hwtype =
{
    "ether", "Ethernet", ARPHRD_ETHER, ETH_ALEN,
    pr_ether, NULL /* UNUSED in_ether */, NULL
};


#endif				/* HAVE_HWETHER */


#if HAVE_HWPPP

#include <net/if_arp.h>

#ifdef KEEP_UNUSED
/* Start the PPP encapsulation on the file descriptor. */
static int do_ppp(int fd)
{
    fprintf(stderr, _("You cannot start PPP with this program.\n"));