commands/httpd/httpd.c

   1 /* httpd.c
   2  *
   3  * httpd        A Server implementing the HTTP protocol.
   4  *
   5  * usage:       tcpd http httpd &
   6  *
   7  * 02/17/1996                   Michael Temari <Michael@TemWare.Com>
   8  * 07/07/1996 Initial Release   Michael Temari <Michael@TemWare.Com>
   9  * 12/29/2002                   Michael Temari <Michael@TemWare.Com>
  10  * 07/04/2003                   Al Woodhull <awoodhull@hampshire.edu>
  11  *
  12  */
  13
  14 #include <stdlib.h>
  15 #include <sys/types.h>
  16 #include <pwd.h>
  17 #include <stdio.h>
  18 #include <unistd.h>
  19 #include <string.h>
  20 #include "http.h"
  21 #include "utility.h"
  22 #include "net.h"
  23 #include "config.h"
  24
  25 FILE *stdlog = (FILE *)NULL;
  26 FILE *dbglog = (FILE *)NULL;
  27
  28 char umsg[80];
  29
  30 _PROTOTYPE(int main, (int argc, char *argv[]));
  31
  32 struct http_request request;
  33 struct http_reply reply;
  34
  35 int main(argc, argv)
  36 int argc;
  37 char *argv[];
  38 {
  39 char *prog;
  40 int opt_t;
  41 char *cfg = (char *)NULL;
  42 struct passwd *pwd;
  43 int s;
  44
  45    strcpy(umsg, "Usage: ");
  46    strcat(umsg, argv[0]);
  47    strcat(umsg, " [-t|v] [config_file]\n");
  48
  49    /* parse program name */
  50    prog = strrchr(*argv, '/');
  51    if(prog == (char *)NULL)
  52         prog = *argv;
  53    else
  54         prog++;
  55    argv++;
  56    argc--;
  57
  58    /* Any options */
  59    if(argc)
  60         if(argv[0][0] == '-') {
  61              switch (argv[0][1]) {
  62                   case 't' : opt_t = 1;
  63                              argv++;
  64                              argc--;
  65                              break;
  66                   case 'v' : fprintf(stderr, VERSION"\n");
  67                              exit(EXIT_SUCCESS);
  68                              break;
  69                   default  : fprintf(stderr, VERSION"\n");
  70                              fprintf(stderr, umsg);
  71                              exit(EXIT_FAILURE);
  72              }
  73         }
  74
  75    /* Did they specify an alternate configuration file? */
  76    if(argc) {
  77         cfg = *argv++;
  78         argc--;
  79    }
  80
  81    /* Read the configuration settings */
  82    if(readconfig(cfg, opt_t)) {
  83         fprintf(stderr, "httpd: Error reading configuration file.\n");
  84         return(-1);
  85    }
  86
  87    /* Option t is to test configuration only */
  88    if(opt_t)
  89         return(0);
  90
  91    /* Open log file for append if it exists */
  92    if(LogFile != NULL)
  93         if((stdlog = fopen(LogFile, "r")) != (FILE *)NULL) {
  94                 fclose(stdlog);
  95                 stdlog = fopen(LogFile, "a");
  96         }
  97
  98    /* Open debug log file for append if it exists */
  99    if(DbgFile != NULL)
 100         if((dbglog = fopen(DbgFile, "r")) != (FILE *)NULL) {
 101                 fclose(dbglog);
 102                 dbglog = fopen(DbgFile, "a");
 103    }
 104
 105 #if 0
 106    /* Get some network information */
 107    GetNetInfo();
 108 #endif
 109
 110    /* If user defined then prepare to secure as user given */
 111    if(User != NULL)
 112         if((pwd = getpwnam(User)) == (struct passwd *)NULL) {
 113                 fprintf(stderr, "httpd: unable to find user %s\n", User);
 114                 return(-1);
 115         }
 116
 117    /* If Chroot defined then secure even more by doing a chroot */
 118    if(Chroot != NULL) {
 119         if(chroot(Chroot)) {
 120                 fprintf(stderr, "httpd: unable to chroot\n");
 121                 return(-1);
 122         }
 123         if(chdir("/")) {
 124                 fprintf(stderr, "httpd: unable to chroot\n");
 125                 return(-1);
 126         }
 127    }
 128
 129    /* If user defined then secure as user given */
 130    if(User != NULL)
 131         if(setgid(pwd->pw_gid) || setuid(pwd->pw_uid)) {
 132                 fprintf(stderr, "httpd: unable to set user\n");
 133                 return(-1);
 134         }
 135
 136 #if DAEMON
 137    /* Standalone? */
 138    if (strncmp(prog, "in.", 3) != 0) {
 139        /* Does not start with "in.", so not started from inetd/tcpd. */
 140        /* XXX - Port name/number should be a config file option. */
 141        daemonloop("http");
 142    }
 143 #endif
 144
 145    /* Get some network information */
 146    GetNetInfo();
 147
 148    /* log a connection */
 149    if(dbglog != (FILE *)NULL) {
 150         fprintf(dbglog, "CONNECT: %d %s %s\n", getpid(),
 151                 rmthostname, logdate((time_t *)NULL));
 152         fflush(dbglog);
 153    }
 154
 155    /* loop getting, processing and replying to requests */
 156    while(!(s = getrequest(&request))) {
 157         if(processrequest(&request, &reply)) break;
 158         if(stdlog != (FILE *)NULL) {
 159                 fprintf(stdlog, "%s %s %d %d %s\n",
 160                         logdate((time_t *)NULL), rmthostname,
 161                         request.method, reply.status, request.url);
 162                 fflush(stdlog);
 163         }
 164         if(sendreply(&reply, &request)) break;
 165         if(!reply.keepopen) break;
 166    }
 167    if(s == 1 && stdlog != (FILE *)NULL) {
 168         fprintf(stdlog, "%s %s %d %d %s\n",
 169                 logdate((time_t *)NULL), rmthostname,
 170                 request.method, 999, request.url);
 171         fflush(stdlog);
 172    }
 173
 174    return(0);
 175 }