CUPWebServer/webserver.c at master · wanghemeng/CUPWebServer · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <time.h>
#include <sys/mman.h>
#include <semaphore.h>
#include <sys/stat.h>
#include <signal.h>

#define VERSION 23
#define BUFSIZE 8096
#define ERROR      42
#define LOG        44
#define FORBIDDEN 403
#define NOTFOUND  404
#define TIMELOG   444
#define CHANGELINE 555
#define BEGIN 111

#define SEM_NAME "sem_example"
#define SHM_NAME "mmap_example"

#ifndef SIGCLD
#   define SIGCLD SIGCHLD
#endif

char timecal[BUFSIZE];

struct {
    char *ext;
    char *filetype;
} extensions [] = {
    {"gif", "image/gif" },
    {"jpg", "image/jpg" },
    {"jpeg","image/jpeg"},
    {"png", "image/png" },
    {"ico", "image/ico" },
    {"zip", "image/zip" },
    {"gz",  "image/gz"  },
    {"tar", "image/tar" },
    {"htm", "text/html" },
    {"html","text/html" },
    {0,0}
};

void timegetter(char *timebuffer)
{
    time_t timep;
    struct tm *p;
    time (&timep);
    p = gmtime(&timep);
    (void)sprintf(timebuffer,"Date: %d.%d.%d\nTime: %d:%d:%d\n",1900+p->tm_year,1+p->tm_mon,p->tm_mday,8+p->tm_hour,p->tm_min,p->tm_sec);
}

void logger(int type, char *s1, char *s2, int socket_fd)
{
    int fd ;
    char timebuffer[BUFSIZE];
    char logbuffer[BUFSIZE*2];

    switch (type) {
        case ERROR:
            (void)sprintf(logbuffer,"ERROR: %s:%s Errno=%d exiting pid=%d",s1, s2, errno,getpid());
            break;
        case FORBIDDEN:
            (void)write(socket_fd, "HTTP/1.1 403 Forbidden\nContent-Length: 185\nConnection: close\nContent-Type: text/html\n\n<html><head>\n<title>403 Forbidden</title>\n</head><body>\n<h1>Forbidden</h1>\nThe requested URL, file type or operation is not allowed on this simple static file webserver.\n</body></html>\n",271);
            (void)sprintf(logbuffer,"FORBIDDEN: %s:%s",s1, s2);
            break;
        case NOTFOUND:
            (void)write(socket_fd, "HTTP/1.1 404 Not Found\nContent-Length: 136\nConnection: close\nContent-Type: text/html\n\n<html><head>\n<title>404 Not Found</title>\n</head><body>\n<h1>Not Found</h1>\nThe requested URL was not found on this server.\n</body></html>\n",224);
            (void)sprintf(logbuffer,"NOT FOUND: %s:%s",s1, s2);
            break;
        case LOG:
            (void)sprintf(logbuffer,"INFO: %s:%s:%d",s1, s2,socket_fd);
            break;
        case TIMELOG:
            (void)sprintf(logbuffer,"The cost of %s is %s ms",s1, s2);
            break;
        case CHANGELINE:
            (void)sprintf(logbuffer,"\n");
            break;
        case BEGIN:
            timegetter(timebuffer);
            break;
        }
        /* No checks here, nothing can be done with a failure anyway */
        if((fd = open("webserver.log", O_CREAT| O_WRONLY | O_APPEND,0644)) >= 0) {
            if (type == BEGIN)
                (void)write(fd,timebuffer,strlen(timebuffer));
            else
                (void)write(fd,logbuffer,strlen(logbuffer));
            (void)write(fd,"\n",1);
            (void)close(fd);
        }
        // if(type == ERROR || type == NOTFOUND || type == FORBIDDEN) exit(3);
    }

    /* this is a child web server process, so we can exit on errors */
void web(int fd, int hit)
{
    struct timeval t1, t2;
    double timeslide;
    logger(BEGIN,"","",fd);
    int j, file_fd, buflen;
    long i, ret, len;
    char * fstr;
    static char buffer[BUFSIZE+1]; /* static so zero filled */

    gettimeofday(&t1, NULL);
    ret = read(fd,buffer,BUFSIZE);   /* read Web request in one go */
    if(ret == 0 || ret == -1) {  /* read failure stop now */
        logger(FORBIDDEN,"failed to read browser request","",fd);
    }
    gettimeofday(&t2, NULL);
    timeslide = (t2.tv_sec - t1.tv_sec) * 1000.0 + (t2.tv_usec - t1.tv_usec) / 1000.0;
    (void)sprintf(timecal,"%f",timeslide);
    logger(TIMELOG,"read web request",timecal,0);

    gettimeofday(&t1, NULL);
    if(ret > 0 && ret < BUFSIZE)  /* return code is valid chars */
        buffer[ret]=0;    /* terminate the buffer */
    else buffer[0]=0;
    for(i=0;i<ret;i++)  /* remove CF and LF characters */
        if(buffer[i] == '\r' || buffer[i] == '\n')
            buffer[i]='*';
    logger(LOG,"request",buffer,hit);

    if( strncmp(buffer,"GET ",4) && strncmp(buffer,"get ",4) ) {
        logger(FORBIDDEN,"Only simple GET operation supported",buffer,fd);
    }
    for(i=4;i<BUFSIZE;i++) { /* null terminate after the second space to ignore extra stuff */
        if(buffer[i] == ' ') { /* string is "GET URL " +lots of other stuff */
            buffer[i] = 0;
            break;
        }
    }
    for(j=0;j<i-1;j++)   /* check for illegal parent directory use .. */
        if(buffer[j] == '.' && buffer[j+1] == '.') {
            logger(FORBIDDEN,"Parent directory (..) path names not supported",buffer,fd);
        }
    if( !strncmp(&buffer[0],"GET /\0",6) || !strncmp(&buffer[0],"get /\0",6) ) /* convert no filename to index file */
        (void)strcpy(buffer,"GET /index.html");

    /* work out the file type and check we support it */
    buflen = strlen(buffer);
    fstr = (char *)0;
    for(i=0;extensions[i].ext != 0;i++) {
        len = strlen(extensions[i].ext);
        if( !strncmp(&buffer[buflen-len], extensions[i].ext, len)) {
            fstr = extensions[i].filetype;
            break;
        }
    }
    if(fstr == 0) logger(FORBIDDEN,"file extension type not supported",buffer,fd);

    if(( file_fd = open(&buffer[5],O_RDONLY)) == -1) {  /* open the file for reading */
        logger(NOTFOUND, "failed to open file",&buffer[5],fd);
    }
    gettimeofday(&t2, NULL);
    timeslide = (t2.tv_sec - t1.tv_sec) * 1000.0 + (t2.tv_usec - t1.tv_usec) / 1000.0;
    (void)sprintf(timecal,"%f",timeslide);
    logger(TIMELOG,"request",timecal,0);

    gettimeofday(&t1, NULL);
    logger(LOG,"SEND",&buffer[5],hit);
    len = (long)lseek(file_fd, (off_t)0, SEEK_END); /* lseek to the file end to find the length */
          (void)lseek(file_fd, (off_t)0, SEEK_SET); /* lseek back to the file start ready for reading */
          (void)sprintf(buffer,"HTTP/1.1 200 OK\nServer: nweb/%d.0\nContent-Length: %ld\nConnection: close\nContent-Type: %s\n\n", VERSION, len, fstr); /* Header + a blank line */
    // it have to be two '\n' !!!
    gettimeofday(&t2, NULL);
    timeslide = (t2.tv_sec - t1.tv_sec) * 1000.0 + (t2.tv_usec - t1.tv_usec) / 1000.0;
    (void)sprintf(timecal,"%f",timeslide);
    logger(TIMELOG,"send",timecal,0);

    gettimeofday(&t1, NULL);
    logger(LOG,"Header",buffer,hit);
    (void)write(fd,buffer,strlen(buffer));

    /* send file in 8KB block - last block may be smaller */
    while ((ret = read(file_fd, buffer, BUFSIZE)) > 0 ) {
        (void)write(fd,buffer,ret);
    }
    gettimeofday(&t2, NULL);
    timeslide = (t2.tv_sec - t1.tv_sec) * 1000.0 + (t2.tv_usec - t1.tv_usec) / 1000.0;
    (void)sprintf(timecal,"%f",timeslide);
    logger(TIMELOG,"header",timecal,0);
    logger(CHANGELINE,"","",0);

    // sleep(1);  /* allow socket to drain before signalling the socket is closed */
    usleep(10000);  /* allow socket to drain before signalling the socket is closed */
    close(file_fd);
    close(fd);
    // exit(1);
}

int main(int argc, char **argv)
{
    struct timeval t1, t2;
    double timeslide;
    gettimeofday(&t1, NULL);
    int i, port, listenfd, socketfd, hit;
    socklen_t length;
    pid_t pid;

    sem_t *psem;
    if ((psem = sem_open(SEM_NAME, O_CREAT, 0666, 1)) == SEM_FAILED)
    {
        perror("create semaphore error");
        exit(1);
    }
    int shm_fd;
    if ((shm_fd = shm_open(SHM_NAME, O_RDWR|O_CREAT, 0666)) < 0)
    {
        perror("create shared memory object error");
        exit(1);
    }
    ftruncate(shm_fd, sizeof(int));
    void *memPtr = mmap(NULL, sizeof(int), PROT_READ|PROT_WRITE, MAP_SHARED, shm_fd, 0);
    if (memPtr == MAP_FAILED)
    {
        perror("creat mmap error");
        exit(1);
    }
    *(double *)memPtr = 0;

    static struct sockaddr_in cli_addr; /* static = initialised to zeros */
    static struct sockaddr_in serv_addr; /* static = initialised to zeros */

    if( argc < 3  || argc > 3 || !strcmp(argv[1], "-?") ) {
        (void)printf("hint: nweb Port-Number Top-Directory\t\tversion %d\n\n"
                    "\tnweb is a small and very safe mini web server\n"
                    "\tnweb only servers out file/web pages with extensions named below\n"
                    "\t and only from the named directory or its sub-directories.\n"
                    "\tThere is no fancy features = safe and secure.\n\n"
                    "\tExample: nweb 8181 /home/nwebdir &\n\n"
                    "\tOnly Supports:", VERSION);
        for(i=0;extensions[i].ext != 0;i++)
            (void)printf(" %s",extensions[i].ext);

        (void)printf("\n\tNot Supported: URLs including \"..\", Java, Javascript, CGI\n"
                    "\tNot Supported: directories / /etc /bin /lib /tmp /usr /dev /sbin \n"
                    "\tNo warranty given or implied\n\tNigel Griffiths nag@uk.ibm.com\n"  );
        exit(0);
    }
    if( !strncmp(argv[2],"/"   ,2 ) || !strncmp(argv[2],"/etc", 5 ) ||
        !strncmp(argv[2],"/bin",5 ) || !strncmp(argv[2],"/lib", 5 ) ||
        !strncmp(argv[2],"/tmp",5 ) || !strncmp(argv[2],"/usr", 5 ) ||
        !strncmp(argv[2],"/dev",5 ) || !strncmp(argv[2],"/sbin",6) ){
        (void)printf("ERROR: Bad top directory %s, see nweb -?\n",argv[2]);
        exit(3);
    }
    if(chdir(argv[2]) == -1){
        (void)printf("ERROR: Can't Change to directory %s\n",argv[2]);
        exit(4);
    }
    /* Become deamon + unstopable and no zombies children (= no wait()) */
    if(fork() != 0)
        return 0; /* parent returns OK to shell */
    (void)signal(SIGCLD, SIG_IGN); /* ignore child death */
    (void)signal(SIGHUP, SIG_IGN); /* ignore terminal hangups */
    for(i=0;i<32;i++)
        (void)close(i);    /* close open files */
    (void)setpgrp();    /* break away from process group */
    logger(LOG,"nweb starting",argv[1],getpid());
    /* setup the network socket */
    if((listenfd = socket(AF_INET, SOCK_STREAM,0)) < 0)
        logger(ERROR, "system call","socket",0);

    port = atoi(argv[1]);
    if(port < 0 || port >60000)
        logger(ERROR,"Invalid port number (try 1->60000)",argv[1],0);

    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    serv_addr.sin_port = htons(port);
    if(bind(listenfd, (struct sockaddr *)&serv_addr,sizeof(serv_addr)) < 0)
        logger(ERROR,"system call","bind",0);
    if(listen(listenfd,64) < 0)
        logger(ERROR,"system call","listen",0);

    gettimeofday(&t2, NULL);
    timeslide = (t2.tv_sec - t1.tv_sec) * 1000.0 + (t2.tv_usec - t1.tv_usec) / 1000.0;
    (void)sprintf(timecal,"%f",timeslide);
    logger(TIMELOG,"Preparation",timecal,0);

    for(hit=1;;hit++) {
        length = sizeof(cli_addr);
        /* use select or poll to aviod block */
        if((socketfd = accept(listenfd, (struct sockaddr *)&cli_addr, &length)) < 0)
            logger(ERROR,"system call","accept",0);
        else
        // web(socketfd,hit);// never returns
            if((pid = fork()) < 0) {
                logger(ERROR,"system call","fork",0);
            }
            else {
                if(pid == 0) {   /* child */
                    (void)close(listenfd);
                    gettimeofday(&t1, NULL);
                    web(socketfd,hit); /* never returns */
                    gettimeofday(&t2, NULL);
                    timeslide = (t2.tv_sec - t1.tv_sec) * 1000.0 + (t2.tv_usec - t1.tv_usec) / 1000.0;
                    *(double *)memPtr += timeslide;
                    int fd ;
                    if((fd = open("time.log", O_CREAT| O_WRONLY | O_APPEND,0644)) >= 0)
                    {
                        (void)sprintf(timecal,"Piece time is %f ms, whole time is %f ms\n",timeslide, *(double *)memPtr);
                        (void)write(fd,timecal,strlen(timecal));
                    }
                    (void)close(fd);
                    exit(0);
                } else {   /* parent */
                    (void)close(socketfd);
                }
            }
    }
    // wait(NULL);
}