/* * netifconfig.c -- look and change the interface configuration * * Copyright (C) 2001 Alessandro Rubini and Jonathan Corbet * Copyright (C) 2001 O'Reilly & Associates * * The source code in this file can be freely used, adapted, * and redistributed in source or binary form, so long as an * acknowledgment appears in derived source files.  The citation * should list that the code comes from the book "Linux Device * Drivers" by Alessandro Rubini and Jonathan Corbet, published * by O'Reilly & Associates.   No warranty is attached; * we cannot take responsibility for errors or fitness for use. */#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <string.h>#include <errno.h>#include <sys/types.h>#include <sys/socket.h>#include <sys/ioctl.h>#include <net/if.h>#include <netinet/in.h>char *prgname;int getconfig(int sock, struct ifreq *req, int print){    if ( ioctl(sock, SIOCGIFMAP, req) < 0) {        fprintf(stderr, "%s: ioctl(SIOCGIFMAP): %s\n",                prgname,strerror(errno));        return -1;    }    if (print)         printf("%s: mem=0x%lx-0x%lx, io=0x%x, irq=%i, dma=%i, port=%i\n",               req->ifr_name,               (long)req->ifr_map.mem_start,               (long)req->ifr_map.mem_end,               req->ifr_map.base_addr,               req->ifr_map.irq,               req->ifr_map.dma,               req->ifr_map.port);    return 0;}int setconfig(int sock, struct ifreq *req){    if ( ioctl(sock, SIOCSIFMAP, req) < 0) {        fprintf(stderr, " %s: ioctl(SIOCSIFMAP): %s\n",                prgname,strerror(errno));        return -1;    }    return 0;}int main(int argc, char **argv){    int sock;    struct ifreq req;    char *action = NULL;    prgname = argv[0];    if (argc < 2) {        fprintf(stderr,"%s: usage is \"%s <ifname> [<operation>]\"\n",                prgname, prgname);        exit(1);    }    strcpy(req.ifr_name, argv[1]);    argc--; argv++; /* shift the interface out */    /* a silly raw socket just for ioctl()ling it */    sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);    if (sock < 0) {        fprintf(stderr, "%s: socket(): %s\n", argv[0],strerror(errno));        exit(1);    }    if (getconfig(sock,&req, (argc==1) )) /* print if no commands */        exit(1);    /* ok, now loop through the options */    while (argc > 1) {        char *value;        int ivalue = 0;        action = argv[1];        value = strchr(action,'=');        if (value) {            *value=0; /* terminate action */            value++; /* skip the terminator */            sscanf(value,"%i",&ivalue);            /* fprintf(stderr,"--> %s %i\n",action,ivalue); */        }        if (!strcmp(action,"mem_start"))            req.ifr_map.mem_start=ivalue;        else if (!strcmp(action,"mem_end"))            req.ifr_map.mem_end=ivalue;        else if (!strcmp(action,"io"))            req.ifr_map.base_addr=ivalue;        else if (!strcmp(action,"irq"))            req.ifr_map.irq=ivalue;        else if (!strcmp(action,"dma"))            req.ifr_map.dma=ivalue;        else if (!strcmp(action,"port"))            req.ifr_map.port=ivalue;        else if (!strcmp(action,"tell"))            getconfig(sock,&req, 1);        else {            fprintf(stderr,"%s: unknown argument \"%s\"\n",                    prgname,action);            argc--; argv++; continue;        }        if (strcmp(action,"tell"))            setconfig(sock,&req);        argc--; argv++;    }    exit(0);}