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)
  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=\"/lcd.png\" height=\"234\" width=\"320\">\n");
  46         send_text(s, "</body></html>\n");
  47 }
  48
  49 static void serve_lcd(int s, struct scope *sc)
  50 {
  51         char buf[256];
  52         int imglen;
  53         unsigned char *png;
  54
  55         claimscope(sc);
  56         png = get_lcd(sc, &imglen, 0);
  57         releasescope(sc);
  58
  59         if (png == NULL)
  60                 return;
  61
  62
  63         send_text(s, "HTTP/1.0 200 OK\n");
  64         send_text(s, "Content-type: image/png\n");
  65         snprintf(buf, sizeof(buf), "Content-length: %u\n\n", imglen);
  66         send_text(s, buf);
  67         send_binary(s, (char*)png, imglen);
  68         free(png);
  69 }
  70
  71 int is_eor(char *buf)
  72 {
  73         int eor = 0;
  74
  75         /* This does not completely work, when the request is split
  76            in multiple packets... */
  77         if (strstr(buf, "\x0d\x0a\x0d\x0a")) {
  78                 eor = 1;
  79         } else if (strstr(buf, "\x0a\x0a")) {
  80                 eor = 1;
  81         } else if (strcmp(buf, "\x0d\x0a") == 0) {
  82                 eor = 1;
  83         } else if (strcmp(buf, "\x0a") == 0) {
  84                 eor = 1;
  85         }
  86
  87         return eor;
  88 }
  89
  90
  91 static void parse_request(int s, struct scope *sc)
  92 {
  93         int ret;
  94         int eor;
  95         char buf[4096];
  96         char file[4096];
  97         const char delim[] = " \t\x0d\x0a";
  98         char *saveptr;
  99         char *token;
 100
 101         alarm(TIMEOUT);
 102         ret=read(s, buf, sizeof(buf)-1);
 103         if (ret == -1) {
 104                 perror("read");
 105                 return;
 106         }
 107         buf[ret] = 0;
 108
 109         eor = is_eor(buf);
 110
 111         token = strtok_r(buf, delim, &saveptr);
 112         if (token == NULL)
 113                 return;
 114         /* TODO: Only GET... */
 115         token = strtok_r(NULL, delim, &saveptr);
 116         if (token == NULL)
 117                 return;
 118         bzero(&file, sizeof(file));
 119         strncpy(file, token, sizeof(file)-1);
 120
 121         while (!eor) {
 122                 alarm(TIMEOUT);
 123                 ret=read(s, buf, sizeof(buf)-1);
 124                 if (ret == -1) {
 125                         perror("read");
 126                         return;
 127                 }
 128                 buf[ret] = 0;
 129                 eor = is_eor(buf);
 130         }
 131         alarm(0);
 132
 133         if (strcmp("/", file) == 0) {
 134                 serve_index(s, sc);
 135         } else if (strcmp("/lcd.png", file) == 0) {
 136                 serve_lcd(s, sc);
 137         }
 138 }
 139
 140 void sighandler(int sig)
 141 {
 142         switch(sig) {
 143                 case SIGPIPE:
 144                         break;
 145                 case SIGALRM:
 146                 default:
 147                         printf("Signal %d received\n", sig);
 148                         break;
 149         }
 150 }
 151
 152 int main(int argc, char **argv)
 153 {
 154         struct sigaction act;
 155         int sock, csock;
 156         int opt;
 157         socklen_t slen;
 158         struct scope *sc;
 159         struct sockaddr_in sin, clientsin;
 160         unsigned short port = 8088;
 161
 162         sc = initscope();
 163         if (sc == NULL) {
 164                 printf("Scope not found!\n");
 165                 exit(EXIT_FAILURE);
 166         }
 167
 168         bzero(&act, sizeof(act));
 169         act.sa_handler = sighandler;
 170         act.sa_flags = SA_RESTART;
 171         if (sigaction(SIGPIPE, &act, NULL) == -1) {
 172                 perror("sigaction");
 173                 exit(EXIT_FAILURE);
 174         }
 175
 176         bzero(&act, sizeof(act));
 177         act.sa_handler = sighandler;
 178         if (sigaction(SIGALRM, &act, NULL) == -1) {
 179                 perror("sigaction");
 180                 exit(EXIT_FAILURE);
 181         }
 182
 183         if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
 184                 perror("socket");
 185                 exit(EXIT_FAILURE);
 186         }
 187
 188         if (argc == 2) {
 189                 port=atoi(argv[1]);
 190         }
 191
 192         bzero(&sin, sizeof(sin));
 193         sin.sin_addr.s_addr=htonl(INADDR_ANY);
 194         sin.sin_family=AF_INET;
 195         sin.sin_port=htons(port);
 196
 197         opt = 1;
 198         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &opt,sizeof(opt));
 199
 200         if (bind(sock, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
 201                 perror("bind");
 202                 exit(EXIT_FAILURE);
 203         }
 204
 205         listen(sock, 32);
 206         printf("Listening on Port %u\n", port);
 207
 208         while(1) {
 209                 bzero(&clientsin, sizeof(clientsin));
 210                 slen = sizeof(clientsin);
 211                 if ((csock = accept(sock, (struct sockaddr*)&clientsin, &slen)) == -1) {
 212                         perror("accept");
 213                 }
 214
 215                 parse_request(csock, sc);
 216
 217                 close(csock);
 218         }
 219
 220         closescope(sc);
 221         return 0;
 222 }