git.zerfleddert.de Git - rigol/blob - rigold.c

   1 #include <sys/types.h>
   2 #include <sys/socket.h>
   3 #include <arpa/inet.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <strings.h>
   8 #include <unistd.h>
   9 #include <signal.h>
  10
  11 #include "scope.h"
  12 #include "commands.h"
  13
  14 #define TIMEOUT 4
  15
  16 static int send_binary(int s, char *buf, int len)
  17 {
  18         int ret;
  19
  20         while(len > 0) {
  21                 ret = write(s, buf, len);
  22                 if (ret == -1) {
  23                         perror("write");
  24                         return ret;
  25                 }
  26                 buf += ret;
  27                 len -= ret;
  28         }
  29
  30         return 0;
  31 }
  32
  33 static int send_text(int s, char *buf)
  34 {
  35         return send_binary(s, buf, strlen(buf));
  36 }
  37
  38 static void serve_index(int s, struct scope *sc, char *param)
  39 {
  40         send_text(s, "HTTP/1.0 200 OK\n");
  41         send_text(s, "Content-type: text/html\n\n");
  42         send_text(s, "<html><head><title>");
  43         send_text(s, scope_idn(sc));
  44         send_text(s, "</title></head><body bgcolor=\"#ffffff\" text=\"#000000\">\n");
  45         send_text(s, "<img src=\"/cgi-bin/lcd\" height=\"234\" width=\"320\">\n");
  46         send_text(s, "<br>\n");
  47         send_text(s, "<form method=\"get\" action=\"\">\n");
  48         send_text(s, "<input type=\"text\" name=\"cmd\" value=\"");
  49         if (param) {
  50                 if (strncmp(param, "cmd=", 4) == 0)
  51                         param += 4;
  52
  53                 send_text(s, param);
  54         }
  55         send_text(s, "\">\n");
  56         send_text(s, "<input type=\"submit\">\n");
  57         send_text(s, "</form>\n");
  58         if (param) {
  59                 unsigned char buf[1024*1024];
  60                 int res;
  61
  62                 claimscope(sc);
  63                 if (strchr (param, '?')) {
  64                         res = sendscpi(sc, param, buf, sizeof(buf));
  65                         send_text(s, "<pre>< ");
  66                         send_text(s, param);
  67                         send_text(s, "\n> ");
  68                         send_binary(s, (char*)buf, res);
  69                         send_text(s, "</pre>\n");
  70                 } else {
  71                         sendscpi(sc, param, NULL, 0);
  72                 }
  73                 releasescope(sc);
  74         }
  75         send_text(s, "</body></html>\n");
  76 }
  77
  78 static void serve_lcd(int s, struct scope *sc)
  79 {
  80         char buf[256];
  81         int imglen;
  82         unsigned char *png;
  83
  84         claimscope(sc);
  85         png = get_lcd(sc, &imglen, 0);
  86         releasescope(sc);
  87
  88         if (png == NULL)
  89                 return;
  90
  91
  92         send_text(s, "HTTP/1.0 200 OK\n");
  93         send_text(s, "Content-type: image/png\n");
  94         snprintf(buf, sizeof(buf), "Content-length: %u\n\n", imglen);
  95         send_text(s, buf);
  96         send_binary(s, (char*)png, imglen);
  97         free(png);
  98 }
  99
 100 static void serve_404(int s)
 101 {
 102         send_text(s, "HTTP/1.0 404 Not found\n");
 103         send_text(s, "Content-type: text/html\n\n");
 104         send_text(s, "<html><head><title>404</title></head>");
 105         send_text(s, "<body bgcolor=\"#ffffff\" text=\"#000000\">\n");
 106         send_text(s, "<h1>404</h1>");
 107         send_text(s, "</body></html>\n");
 108 }
 109
 110 int is_eor(char *buf)
 111 {
 112         int eor = 0;
 113
 114         /* This does not completely work, when the request is split
 115            in multiple packets... */
 116         if (strstr(buf, "\x0d\x0a\x0d\x0a")) {
 117                 eor = 1;
 118         } else if (strstr(buf, "\x0a\x0a")) {
 119                 eor = 1;
 120         } else if (strcmp(buf, "\x0d\x0a") == 0) {
 121                 eor = 1;
 122         } else if (strcmp(buf, "\x0a") == 0) {
 123                 eor = 1;
 124         }
 125
 126         return eor;
 127 }
 128
 129
 130 static void parse_request(int s, struct scope *sc)
 131 {
 132         int ret;
 133         int eor;
 134         char buf[4096];
 135         char file[4096];
 136         const char delim[] = " \t\x0d\x0a";
 137         char *saveptr;
 138         char *token;
 139         char *param = NULL;
 140
 141         alarm(TIMEOUT);
 142         ret=read(s, buf, sizeof(buf)-1);
 143         if (ret == -1) {
 144                 perror("read");
 145                 return;
 146         }
 147         buf[ret] = 0;
 148
 149         eor = is_eor(buf);
 150
 151         token = strtok_r(buf, delim, &saveptr);
 152         if (token == NULL)
 153                 return;
 154         /* TODO: Only GET... */
 155         token = strtok_r(NULL, delim, &saveptr);
 156         if (token == NULL)
 157                 return;
 158         bzero(&file, sizeof(file));
 159         strncpy(file, token, sizeof(file)-1);
 160
 161         while (!eor) {
 162                 alarm(TIMEOUT);
 163                 ret=read(s, buf, sizeof(buf)-1);
 164                 if (ret == -1) {
 165                         perror("read");
 166                         return;
 167                 }
 168                 buf[ret] = 0;
 169                 eor = is_eor(buf);
 170         }
 171         alarm(0);
 172
 173         param = strchr(file, '?');
 174         if (param) {
 175                 *param = 0;
 176                 param++;
 177
 178                 while ((token = strchr(param, '%')) != NULL) {
 179                         char buf[3];
 180
 181                         if (strlen(token+1) < 2)
 182                                 break;
 183
 184                         strncpy(buf, token+1, 3);
 185                         buf[2] = 0;
 186
 187                         *token = (char)strtoul(buf, NULL, 16);
 188                         memmove(token+1, token+3, strlen(token)-2);
 189
 190                 }
 191         }
 192
 193         if (strcmp("/", file) == 0) {
 194                 serve_index(s, sc, param);
 195         } else if (strcmp("/cgi-bin/lcd", file) == 0) {
 196                 serve_lcd(s, sc);
 197         } else {
 198                 serve_404(s);
 199         }
 200 }
 201
 202 void sighandler(int sig)
 203 {
 204         switch(sig) {
 205                 case SIGPIPE:
 206                         break;
 207                 case SIGALRM:
 208                 default:
 209                         printf("Signal %d received\n", sig);
 210                         break;
 211         }
 212 }
 213
 214 int main(int argc, char **argv)
 215 {
 216         struct sigaction act;
 217         int sock, csock;
 218         int opt;
 219         socklen_t slen;
 220         struct scope *sc;
 221         struct sockaddr_in sin, clientsin;
 222         unsigned short port = 8088;
 223
 224         sc = initscope();
 225         if (sc == NULL) {
 226                 printf("Scope not found!\n");
 227                 exit(EXIT_FAILURE);
 228         }
 229
 230         bzero(&act, sizeof(act));
 231         act.sa_handler = sighandler;
 232         act.sa_flags = SA_RESTART;
 233         if (sigaction(SIGPIPE, &act, NULL) == -1) {
 234                 perror("sigaction");
 235                 exit(EXIT_FAILURE);
 236         }
 237
 238         bzero(&act, sizeof(act));
 239         act.sa_handler = sighandler;
 240         if (sigaction(SIGALRM, &act, NULL) == -1) {
 241                 perror("sigaction");
 242                 exit(EXIT_FAILURE);
 243         }
 244
 245         if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
 246                 perror("socket");
 247                 exit(EXIT_FAILURE);
 248         }
 249
 250         if (argc == 2) {
 251                 port=atoi(argv[1]);
 252         }
 253
 254         bzero(&sin, sizeof(sin));
 255         sin.sin_addr.s_addr=htonl(INADDR_ANY);
 256         sin.sin_family=AF_INET;
 257         sin.sin_port=htons(port);
 258
 259         opt = 1;
 260         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &opt,sizeof(opt));
 261
 262         if (bind(sock, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
 263                 perror("bind");
 264                 exit(EXIT_FAILURE);
 265         }
 266
 267         listen(sock, 32);
 268         printf("Listening on Port %u\n", port);
 269
 270         while(1) {
 271                 bzero(&clientsin, sizeof(clientsin));
 272                 slen = sizeof(clientsin);
 273                 if ((csock = accept(sock, (struct sockaddr*)&clientsin, &slen)) == -1) {
 274                         perror("accept");
 275                 }
 276
 277                 parse_request(csock, sc);
 278
 279                 close(csock);
 280         }
 281
 282         closescope(sc);
 283         return 0;
 284 }