[求助]出现这个问题 error: incompatible types in assignment
我在做一个HTTP SERVER 上代码
/*
* Program: server_web120.c
* Author: Paul Girard Ph.D., DIM, UQAC
* Date: Sept 2012
* Version: 1.2
*
* Objective: This basic web program supports http 1.0 and 1.1 :
* - GET method from a client commercial web navigator
* - validates the request GET for error codes 400 and 404
* - and generates a response following http protocol rules
* (code 200). html pages are coded in the program source.
*
* This version doesn't support access to external files.
* Most http client header parameters are ignored :
* (User_Agent, From, Referer, Connection, Accept, ...)
*
* Compilation and link options : (Solaris)
* gcc server_web120.c -lsocket -lnsl -o server_web120 or
*
* gcc server_web120.c -lsocket -lnsl -w -o server_web120
* to suppress "warnings"
Compilation and link options : (Linux)
* gcc server_web120.c -lnsl -o server_web120 or
*
* gcc server_web120.c -lnsl -w -o server_web120
* to suppress "warnings"
*
* Execution: 2 formal parameters to run the server :
* server_name and port #
* dimensxcn1% server_web120 port#
* (note: port 80 is assigned to a commercial http server
* ex. dimenszxcn1% server_web120 5001
*
* The following html pages are coded directly in the source
* : HOME_PAGE and TIME. They can be called
* like this by a telnet client or a web client navigator
*
* 1. with a telnet client using http 1.0 protocol:
* telnet sunense.uqac.ca port# (no_port: port # used)
* GET / HTTP/1.0 to get HOME_PAGE and an empty
* cr/lf line to terminate the request
* telnet sunense.uqac.ca port#
* GET /time HTTP/1.0 to get TIME
* cr/lf
*
* 2. with telnet using HTTP/1.1 protocol and Apache:
* telnet sunense.uqac.ca 80
* GET / HTTP/1.1
* Host: dimensxcn1.uqac.ca
* cr/lf
* telnet dimensxcn1.uqac.ca 80
* Host: dimensxcn1.uqac.ca
* GET /time HTTP/1.1
* Host: dimensxcn1.uqac.ca
* cr/lf
*
* 3. with Netscape or Explorer client
* http://dimensxcn1.uqac.ca :no_port to get Home_Page
* http://dimensxcn1.uqac.ca :no_port/time to get time
*/
/*
* Files to include
*/
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/time.h>
#include <sys/stat.h>
#define BUFFSIZE 256
#define SERVER_NAME "Mini web server V1.0 (Paul Girard, Ph.D., UQAC)"
#define ERROR_400 "<head></head><body><html><h1>Error 400</h1><p>Th\e server couldn't understand your request.</html></body>\n"
#define ERROR_404 "<head></head><body><html><h1>Error 404</h1><p>Do\cument not found.</html></body>\n"
/*#define HOME_PAGE "<head></head><body><html><h1>Welcome to the mini \
web server PG_web</h1><p>Let me invite you to visit : <ul><li><a href=\
\"http:\\wwwens.uqac.ca/~pgirard\"><font color=\"#0000ff\"> my personal \
site</font></a></li></ul></html></body>\n"*/
#define TIME_PAGE "<head></head><body><html><h1>The actual date is : \<br><br>%s</h1></html></body>\n"
int recvln(int, char *, int); /* read a client http line */
void send_header(int, int, int,int); /* send a http header to client*/
int wait_connection(short); /* wait for a client connection */
void send_eof(int); /* close a client connection */
int init = 0; /* initialization */
int sock; /* socket */
int stat(const char *path,struct stat *buf);
/* ***************************************************************************
* Main Program
* ***************************************************************************
*/
int main(int argc, char *argv[]) /* argv[0] pointer to program name
argv[1] pointer to port number */
{
char filename[]="../res00040/document/image.jpg";
FILE *fptr;
int rval;
char *p,*q;
char string[20];
struct stat buf;
char *ptr;
char *drr;
char *end;
int conn; /* socket descriptor */
int n;
char buff[BUFFSIZE], cmd[16], path[64], vers[16];
char *timestr;
struct timeval tv; /* delay in sec since 1/1/1970 */
time_t a; /* function time */
if (argc != 2)
{
fprintf(stderr, "usage : %s <no_port_TCP>\n", argv[0]);
return 1;
}
while(1)
{
/* Wait for a client connection on the known port # */
conn = wait_connection(atoi(argv[1]));
if (conn < 0) return 1;
/* Reads & validates the request client */
n = recvln(conn, buff, BUFFSIZE);
sscanf(buff, "%s %s %s", cmd, path, vers);
printf("Client connection\n");
printf("Request type : %s \tpath : %s \tvers : %s\n",cmd, path, vers);
/* Ignore other client header parameters until \r\n on a line */
while((n = recvln(conn, buff, BUFFSIZE)) > 0)
{
if (n == 2 && buff[0] == '\r' && buff[1] == '\n')
break;
}
/* Check if there is an unexpected EOF */
if (n < 1)
{
send_eof(conn);
continue;
}
/* Validates the http client request */
if (strcmp(cmd, "GET") != 0 &&
(strcmp(vers, "HTTP/1.0") != 0 ||
strcmp(vers, "HTTP/1.1") != 0))
{
send_header(conn, 400, strlen(ERROR_400),0);
send(conn, ERROR_400, strlen(ERROR_400),0);
send_eof(conn);
continue;
}
/* Transmit back the requested html page or
* the message "not found" error */
if (strcmp(path, "/index.html") == 0) /* HOME_PAGE by default*/
{
strcpy(filename, "index.html");
// filename="index.html";
if(stat(filename, &buf) != 0)
exit(0);
printf("filename: %s\n", filename);
send_header(conn, 200, strlen(filename),0);
if((fptr=fopen(filename,"r"))==NULL)
{
perror("error opening this file");
exit(0);
}
while(fgets(buff,256,fptr))
{
send(conn, buff, strlen(buff),0);
}
fclose(fptr);
}
else if (strcmp(path, "/document/image.jpg") == 0 || strcmp(path, "/document/image.jpeg") == 0)
{
filename = strrchr(path, '/document/image.jpg') ;
end=".jpg";
drr= strrchr(path, '.');
strcpy(drr,end);
if(stat(filename, &buf) != 0)
exit(0);
printf("File size:%d octets",buf.st_size);
printf("filename: %s\n", filename);
send_header(conn, 200, buf.st_size,0);
if((fptr=fopen(filename,"r"))==NULL)
{ perror("error opening this file");
exit(0);}
while(feof(fptr)==0){
rval=fread(buff,sizeof(char),256,fptr);
if(rval>0)
send(conn, buff, rval,0);
}
fclose(fptr);
}
else if (strcmp(path, "/document/image.gif") == 0)
{
filename =(strrchr(path, '/') + 1);
end=".gif";
drr= strrchr(path, '.');
strcpy(drr,end);
if(stat(filename, &buf) != 0)
exit(0);
printf("File size:%d octets",buf.st_size);
printf("filename: %s\n", filename);
send_header(conn, 200, buf.st_size,1);
if((fptr=fopen(filename,"r"))==NULL)
{ perror("error opening this file");
exit(0);}
while(feof(fptr)==0){
rval=fread(buff,sizeof(char),256,fptr);
if(rval>0)
send(conn, buff, rval,0);
}
fclose(fptr);
}
else if (strcmp(path, "/page1.html") == 0 )
{
filename = (strrchr(path, '/') + 1);
if(stat(filename, &buf) != 0)
exit(0);
printf("filename: %s\n", filename);
send_header(conn, 200, strlen(filename),2);
if((fptr=fopen(filename,"r"))==NULL)
{ perror("error opening this file");
exit(0);}
while(fgets(buff,256,fptr))
{
send(conn, buff, strlen(buff),0);
}
puts(buff);
fclose(fptr);
}
else if (strcmp(path, "/time") == 0) /* time page */
{
/* Solaris ==> if (gettimeofday(&tv, NULL) == -1)
puts("Error with gettimeofday()");
timestr = ctime(&tv.tv_sec); */
/* testtime.c: test of time function*/
if (gettimeofday(&tv, NULL) == -1)
puts("Error with gettimeofday()");
timestr = ctime(&a); /* formatted date-time */
sprintf(buff, TIME_PAGE, timestr);
send_header(conn, 200, strlen(buff),0);
send(conn, buff, strlen(buff), 0);
}
else if(!(drr= strrchr(path, '.')))
//then we will add default extention name ".html",
{
filename = (strcat(path, ".html")+1);//这里有问题，不知道怎么改~求帮助
if(stat(filename, &buf) != 0)
exit(0);
printf("filename: %s\n", filename);
send_header(conn, 200, strlen(filename),0);
if((fptr=fopen(filename,"r"))==NULL)
{ perror("error opening this file");
exit(0);}
while(fgets(buff,256,fptr)){
send(conn, buff, strlen(buff),0);
}
puts(buff);
fclose(fptr);}
else
{ /* Error not found */
/*send_header(conn, 404, strlen(ERROR_404));
send(conn, ERROR_404, strlen(ERROR_404),0);*/
if((fptr=fopen(filename,"r"))==NULL)
{
perror("error opening this file");
exit(0);
}
if(stat(filename,&buf))
send_header(conn,200,buf.st_size,0);
}
send_eof(conn); /* close the client socket */
} /* end of infinite loop */
} /* ==== end of main program */
/* *************************************************************************
* Function wait_connection() returns a client connection
* *************************************************************************
*/
int wait_connection(short no_port)
{
struct sockaddr_in sockaddr; /* internet format */
int newsock; /* socket descriptor */
size_t length; /* #octets in sockadr_in structure*/
/*
* Tcp socket creation
*/
switch (init)
{
case 0 :
sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0)
{
perror("Error in socket creation");
return 1;
}
/*
* 2. Specify the local part of the address :
* 1)the local port number in network format and
* 2)the local IP address. INADDR_ANY is used on a server
* because many ip addresses may be used on the same machine.
*/
sockaddr.sin_family = AF_INET;
sockaddr.sin_addr.s_addr = INADDR_ANY;
sockaddr.sin_port = htons(no_port);
if (bind(sock, (struct sockaddr *)&sockaddr, sizeof(sockaddr)) < 0)
{
perror("The bind socket did not work");
close(sock);
return 1;
}
/*
* Simple validation: find the name associated to this socket
* and print its port number
*/
length = sizeof(sockaddr);
if (getsockname(sock, (struct sockaddr *)&sockaddr, &length ) < 0 )
{
perror("Error in getsockname()");
exit(1);
}
printf("The socket tcp port # is #%d\n", ntohs(sockaddr.sin_port));
/*
* Fix the maximum number of clients waiting connection and
* leave the server in passive mode
*/
listen(sock, 5);
puts("Server ready for client connection");
init = 1; /* end of initialization */
case 1: /* after initialization continue here */
newsock = accept(sock, (struct sockaddr *) 0, (size_t *) 0);
return newsock;
}
}
/* ==== End of wait_connection ================================================ */
/* *************************************************************************
* Function recvlin() reading a socket connection with recv()
* until newline (\n) or EOF is read. A flush of the remaining characters
* is done until newline or EOF if the buffer is full. It returns a full
* buffer.
*
* conn: socket # (input)
* *buff: address of the buffer receiving a complete line (input)
* buffsz: buffer size in octets (input)
* ==> recvln returns the length in octets of read characters in buff
* **************************************************************************
*/
int recvln(int conn, char *buff, int buffsz)
{
char *bp = buff, c;
int n; /* #octets read by recv() */
/* While buffer not full and we can read characters
* different from \n, octets are saved in buff
*/
while (bp - buff < buffsz &&
(n = recv(conn, bp, 1, 0)) > 0)
{
if (*bp++ == '\n') return (bp - buff);
}
if (n < 0) /* read has failed */
return -1;
/* If the buffer is full, ignore the rest until \n */
if (bp - buff == buffsz)
while (recv(conn, &c, 1, 0) > 0 && c != '\n');
return (bp - buff);
}
/* ==== End de recvln ====================================================== */
/* *************************************************************************
* Function send_header() sending the http 1.0 header to client
* with the status, server name, content type and content length
* *************************************************************************
*/
void send_header(int conn, int stat, int len,int i)
{
char *statstr, buff[BUFFSIZE];
/* change the status code to a character string message */
switch(stat)
{
case 200:
statstr = "OK";
break;
case 400:
statstr = "Bad Request";
break;
case 404:
statstr = "Not Found";
break;
default:
statstr = "Unknown";
break;
}
/*
* send the parameter server header
* "HTTP/1.0 Server Content-Length Content-Type" to client
*/
sprintf(buff, "HTTP/1.0 %d %s\r\n", stat, statstr);
send(conn, buff, strlen(buff), 0);
sprintf(buff, "Server: %s\r\n", SERVER_NAME);
send(conn, buff, strlen(buff), 0);
sprintf(buff, "Content-Length: %d\r\n", len);
send(conn, buff, strlen(buff), 0);
switch(i)
{
case 0:
sprintf(buff, "Content-Type: text/html\r\n");
send(conn, buff, strlen(buff), 0);break;
case 1:
sprintf(buff, "Content-Type: image/jpg\r\n");
send(conn, buff, strlen(buff), 0);break;
case 2:
sprintf(buff, "Content-Type: image/gif\r\n");
send(conn, buff, strlen(buff), 0);break;
}
sprintf(buff, "\r\n");
send(conn, buff, strlen(buff), 0);
}
/* ===================== end of send_header ================================ */
/* ****************************************************************************
* Function send_eof() closes the connection from this end
* by using a shutdown() call which shuts down all or part of a full-duplex
* connection on the associated socket .
* 0 : further receives will be disallowed,
* l : further sends will be disallowed (this mode is used),
* 2: further sends and receives will be disallowed
* *****************************************************************************
*/
void send_eof(int conn)
{
printf("End of client connection\n");
shutdown(conn,1);
return;
}
/*===================== end of send_eof =================================== */
总是提示filename =(strrchr(path, '/') + 1);有错误，错误提示incompatible types in assignment
求指教
[ 本帖最后由 c199163 于 2013-10-10 20:53 编辑 ]
