rcfile.c

一款基于GTK的internet phone 程序。程序分为服务器端和客户端两部分。服务器端维护用户的IP

#include "phone.h"

#define HOMEENV "HOME"
#define USERENV "USER"
#define RCNAME ".phonerc"

struct alias *aliaslist=0;

static int inleft;
static unsigned char inbuff[256],*inpoint;
static int infile;
static void initread(int f)
{
	inleft=0;
	infile=f;
}
static int ci(void)
{
	if(!inleft)
	{
		inleft=read(infile,inbuff,sizeof(inbuff));
		inpoint=inbuff;
	}
	if(inleft<=0) return -1;
	--inleft;
	return *inpoint++;
}


int getline(char *put,int len)
{
int n;
int ch;
	n=0;
	while(len>1)
	{
		ch=ci();
		if(ch<0) break;
		++n;
		if(ch=='\n') break;
		*put++=ch;
		--len;
	}
	*put=0;
	return n;
}

void addalias(char *from,char *to)
{
struct alias *analias;
	analias=malloc(sizeof(struct alias));
	if(!analias)
	{
		printf("Failed to allocate memory for an alias...\n");
		nomem(1123);
	}
	analias->next=aliaslist;
	strcpy(analias->from,from);
	strcpy(analias->to,to);
	aliaslist=analias;
}

void listaliases(void)
{
struct alias *analias;

	analias=aliaslist;
	while(analias)
	{
		printf("%s -> %s\n",analias->from,analias->to);
		analias=analias->next;
	}
}

char *findalias(char *s)
{
struct alias *analias;

	analias=aliaslist;
	while(analias)
	{
		if(!strcmp(analias->from,s)) break;
		analias=analias->next;
	}
	if(!analias) return 0;
	return analias->to;
}

int hexdigit(char c)
{
	if(c>='0' && c<='9') return c-'0';
	if(c>='a' && c<='f') return c-'a'+10;
	if(c>='A' && c<='F') return c-'A'+10;
	return -1;
}
void getkey(char *s)
{
int n;
int i;
unsigned char temp[KEYSIZE+1];

	memset(temp,0,KEYSIZE);
	while((n=hexdigit(*s++))>=0)
	{
		temp[KEYSIZE]=n<<4;
		for(i=0;i<KEYSIZE;++i)
			temp[i]=(temp[i]<<4) | (temp[i+1]>>4);
	}
	memcpy(mykey,temp,KEYSIZE);
}


void scanrcfile(char *rcname)
{
char *s;
char name[256];
char directive[64];
char data1[MAXNAMESIZE];
char data2[MAXNAMESIZE];
int f;

	if(!rcname)
	{
		s=getenv(HOMEENV);
		if(!s)
		{
			printf("Could not get %s environment variable\n",HOMEENV);
			return;
		}
		sprintf(name,"%s/%s",s,RCNAME);
	} else
	{
		strncpy(name,rcname,sizeof(name)-1);
		name[sizeof(name)-1]=0;
	}
	if(s=getenv(USERENV))
	{
		strncpy(username,s,sizeof(username)-1);
		username[sizeof(username)-1]=0;
	} else
	{
		sprintf(username,"nobody-%d",rand()&0xffff);
	}
	f=open(name,O_RDONLY);
	if(f<0)
	{
		printf("Could not open rcfile %s\n",name);
		return;
	}
	initread(f);

	while(getline(name,sizeof(name)))
	{
		s=name;
		token(directive,sizeof(directive),&s);
		if(!strcmp(directive,"user"))
		{
			token(username,sizeof(username),&s);
		} else if(!strcmp(directive,"pass"))
		{
			token(data1,sizeof(data1),&s);
			getkey(data1);
		} else if(!strcmp(directive,"alias"))
		{
			token(data1,sizeof(data1),&s);
			token(data2,sizeof(data2),&s);
			addalias(data1,data2);
		}
	}
	close(f);
}