--- /dev/null
+/*
+ * Wireless Tools
+ *
+ * Jean II - HPL '01
+ *
+ * Just print the ESSID or NWID...
+ *
+ * This file is released under the GPL license.
+ */
+
+#include "iwcommon.h" /* Header */
+
+#define FORMAT_DEFAULT 0 /* Nice looking display for the user */
+#define FORMAT_SCHEME 1 /* To be used as a Pcmcia Scheme */
+
+/*
+ * Note on Pcmcia Schemes :
+ * ----------------------
+ * The purpose of this tool is to use the ESSID discovery mechanism
+ * to select the appropriate Pcmcia Scheme. The card tell us which
+ * ESSID it has found, and we can then select the appropriate Pcmcia
+ * Scheme for this ESSID (Wireless config (encrypt keys) and IP config).
+ * The way to do it is as follows :
+ * cardctl scheme "essidany"
+ * delay 100
+ * $scheme = iwgetid --scheme
+ * cardctl scheme $scheme
+ * Of course, you need to add a scheme called "essidany" with the
+ * following setting :
+ * essidany,*,*,*)
+ * ESSID="any"
+ * IPADDR="10.0.0.1"
+ *
+ * This can also be integrated int he Pcmcia scripts.
+ * Some drivers don't activate the card up to "ifconfig up".
+ * Therefore, they wont scan ESSID up to this point, so we can't
+ * read it reliably in Pcmcia scripts.
+ * I guess the proper way to write the network script is as follows :
+ * if($scheme == "iwgetid") {
+ * iwconfig $name essid any
+ * iwconfig $name nwid any
+ * ifconfig $name up
+ * delay 100
+ * $scheme = iwgetid $name --scheme
+ * ifconfig $name down
+ * }
+ *
+ * This is pseudo code, but you get an idea...
+ * The "ifconfig up" activate the card.
+ * The "delay" is necessary to let time for the card scan the
+ * frequencies and associate with the AP.
+ * The "ifconfig down" is necessary to allow the driver to optimise
+ * the wireless parameters setting (minimise number of card resets).
+ *
+ * Another cute idea is to have a list of Pcmcia Schemes to try
+ * and to keep the first one that associate (AP address != 0). This
+ * would be necessary for closed networks and cards that can't
+ * discover essid...
+ *
+ * Jean II - 29/3/01
+ */
+
+/************************ DISPLAY ESSID/NWID ************************/
+
+/*------------------------------------------------------------------*/
+/*
+ * Display the ESSID if possible
+ */
+static int
+print_essid(int skfd,
+ char * ifname,
+ int format)
+{
+ struct iwreq wrq;
+ char essid[IW_ESSID_MAX_SIZE + 1]; /* ESSID */
+ char pessid[IW_ESSID_MAX_SIZE + 1]; /* Pcmcia format */
+ int i;
+ int j;
+
+ /* Get ESSID */
+ strcpy(wrq.ifr_name, ifname);
+ wrq.u.essid.pointer = (caddr_t) essid;
+ wrq.u.essid.length = 0;
+ wrq.u.essid.flags = 0;
+ if(ioctl(skfd, SIOCGIWESSID, &wrq) < 0)
+ return(-1);
+
+ switch(format)
+ {
+ case FORMAT_SCHEME:
+ /* Stip all white space and stuff */
+ j = 0;
+ for(i = 0; i < strlen(essid); i++)
+ if(isalnum(essid[i]))
+ pessid[j++] = essid[i];
+ pessid[j] = '\0';
+ if((j == 0) || (j > 32))
+ return(-2);
+ printf("%s\n", pessid);
+ fflush(stdout);
+ break;
+ default:
+ printf("%-8.8s ESSID:\"%s\"\n", ifname, essid);
+ break;
+ }
+
+ return(0);
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Display the NWID if possible
+ */
+static int
+print_nwid(int skfd,
+ char * ifname,
+ int format)
+{
+ struct iwreq wrq;
+
+ /* Get network ID */
+ strcpy(wrq.ifr_name, ifname);
+ if(ioctl(skfd, SIOCGIWNWID, &wrq) < 0)
+ return(-1);
+
+ switch(format)
+ {
+ case FORMAT_SCHEME:
+ /* Prefix with nwid to avoid name space collisions */
+ printf("nwid%X\n", wrq.u.nwid.value);
+ fflush(stdout);
+ break;
+ default:
+ printf("%-8.8s NWID:%X\n", ifname, wrq.u.nwid.value);
+ break;
+ }
+
+ return(0);
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Try the various devices until one return something we can use
+ */
+static int
+scan_devices(int skfd,
+ int format)
+{
+ char buff[1024];
+ struct ifconf ifc;
+ struct ifreq *ifr;
+ int i;
+ int ret;
+
+ /* Get list of active devices */
+ ifc.ifc_len = sizeof(buff);
+ ifc.ifc_buf = buff;
+ if(ioctl(skfd, SIOCGIFCONF, &ifc) < 0)
+ {
+ fprintf(stderr, "SIOCGIFCONF: %s\n", strerror(errno));
+ return(-1);
+ }
+ ifr = ifc.ifc_req;
+
+ /* Print the first match */
+ for(i = ifc.ifc_len / sizeof(struct ifreq); --i >= 0; ifr++)
+ {
+ /* Try to print an ESSID */
+ ret = print_essid(skfd, ifr->ifr_name, format);
+ if(ret == 0)
+ return(0); /* Success */
+
+ /* Try to print a nwid */
+ ret = print_nwid(skfd, ifr->ifr_name, format);
+ if(ret == 0)
+ return(0); /* Success */
+ }
+ return(-1);
+}
+
+/*************************** SUBROUTINES ***************************/
+
+/*------------------------------------------------------------------*/
+/*
+ * Display an Ethernet address in readable format.
+ */
+char *
+pr_ether(unsigned char *ptr)
+{
+ static char buff[64];
+
+ sprintf(buff, "%02X:%02X:%02X:%02X:%02X:%02X",
+ (ptr[0] & 0xFF), (ptr[1] & 0xFF), (ptr[2] & 0xFF),
+ (ptr[3] & 0xFF), (ptr[4] & 0xFF), (ptr[5] & 0xFF)
+ );
+ return(buff);
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Open a socket.
+ * Depending on the protocol present, open the right socket. The socket
+ * will allow us to talk to the driver.
+ */
+int
+sockets_open(void)
+{
+ int ipx_sock = -1; /* IPX socket */
+ int ax25_sock = -1; /* AX.25 socket */
+ int inet_sock = -1; /* INET socket */
+ int ddp_sock = -1; /* Appletalk DDP socket */
+
+ inet_sock=socket(AF_INET, SOCK_DGRAM, 0);
+ ipx_sock=socket(AF_IPX, SOCK_DGRAM, 0);
+ ax25_sock=socket(AF_AX25, SOCK_DGRAM, 0);
+ ddp_sock=socket(AF_APPLETALK, SOCK_DGRAM, 0);
+ /*
+ * Now pick any (exisiting) useful socket family for generic queries
+ */
+ if(inet_sock!=-1)
+ return inet_sock;
+ if(ipx_sock!=-1)
+ return ipx_sock;
+ if(ax25_sock!=-1)
+ return ax25_sock;
+ /*
+ * If this is -1 we have no known network layers and its time to jump.
+ */
+
+ return ddp_sock;
+}
+
+/**************************** AP ADDRESS ****************************/
+
+/*------------------------------------------------------------------*/
+/*
+ * Display the NWID if possible
+ */
+static int
+print_ap(int skfd,
+ char * ifname,
+ int format)
+{
+ struct iwreq wrq;
+
+ /* Get network ID */
+ strcpy(wrq.ifr_name, ifname);
+ if(ioctl(skfd, SIOCGIWAP, &wrq) < 0)
+ return(-1);
+
+ /* Print */
+ printf("%-8.8s Access Point: %s\n", ifname,
+ pr_ether(wrq.u.ap_addr.sa_data));
+
+ return(0);
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Try the various devices until one return something we can use
+ */
+static inline int
+scan_ap(int skfd,
+ int format)
+{
+ char buff[1024];
+ struct ifconf ifc;
+ struct ifreq *ifr;
+ int i;
+ int ret;
+
+ /* Get list of active devices */
+ ifc.ifc_len = sizeof(buff);
+ ifc.ifc_buf = buff;
+ if(ioctl(skfd, SIOCGIFCONF, &ifc) < 0)
+ {
+ fprintf(stderr, "SIOCGIFCONF: %s\n", strerror(errno));
+ return(-1);
+ }
+ ifr = ifc.ifc_req;
+
+ /* Print the first match */
+ for(i = ifc.ifc_len / sizeof(struct ifreq); --i >= 0; ifr++)
+ {
+ /* Try to print an ESSID */
+ ret = print_ap(skfd, ifr->ifr_name, format);
+ if(ret == 0)
+ return(0); /* Success */
+ }
+ return(-1);
+}
+
+/******************************* MAIN ********************************/
+
+/*------------------------------------------------------------------*/
+/*
+ * The main !
+ */
+int
+main(int argc,
+ char ** argv)
+{
+ int skfd = -1; /* generic raw socket desc. */
+ int format = FORMAT_DEFAULT;
+ int ret = -1;
+
+ /* Create a channel to the NET kernel. */
+ if((skfd = sockets_open()) < 0)
+ {
+ perror("socket");
+ return(-1);
+ }
+
+ /* No argument */
+ if(argc == 1)
+ {
+ /* Look on all devices */
+ ret = scan_devices(skfd, format);
+ close(skfd);
+ return(ret);
+ }
+
+ /* Only ask for first AP address */
+ if((!strcmp(argv[1], "--ap")) || (!strcmp(argv[1], "-a")))
+ {
+ /* Look on all devices */
+ ret = scan_ap(skfd, format);
+ close(skfd);
+ return(ret);
+ }
+
+ /* Only the format, no interface name */
+ if((!strncmp(argv[1], "--scheme", 4)) || (!strcmp(argv[1], "-s")))
+ {
+ /* Look on all devices */
+ format = FORMAT_SCHEME;
+ ret = scan_devices(skfd, format);
+ close(skfd);
+ return(ret);
+ }
+
+ /* Help */
+ if((argc > 3) ||
+ (!strncmp(argv[1], "-h", 9)) || (!strcmp(argv[1], "--help")))
+ {
+ fprintf(stderr, "Usage: iwgetid [interface]\n");
+ fprintf(stderr, " [interface] --scheme\n");
+ return(-1);
+ }
+
+ /* If at least a device name */
+ if(argc > 1)
+ {
+ /* Check extra format argument */
+ if(argc > 2)
+ {
+ /* Only ask for first AP address */
+ if((!strcmp(argv[2], "--ap")) || (!strcmp(argv[2], "-a")))
+ {
+ ret = print_ap(skfd, argv[1], format);
+ close(skfd);
+ return(ret);
+ }
+
+ /* Want scheme format */
+ if((!strncmp(argv[2], "--scheme", 4)) || (!strcmp(argv[2], "-s")))
+ format = FORMAT_SCHEME;
+ }
+
+ /* Try to print an ESSID */
+ ret = print_essid(skfd, argv[1], format);
+
+ if(ret == -1)
+ {
+ /* Try to print a nwid */
+ ret = print_nwid(skfd, argv[1], format);
+ }
+ }
+
+ /* Close the socket. */
+ close(skfd);
+
+ return(ret);
+}
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