git.mutantstargoat.com Git - reposerve/blob - server/src/main.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <errno.h>
   5 #include <limits.h>
   6 #include <time.h>
   7 #include <signal.h>
   8 #include <unistd.h>
   9 #include <fcntl.h>
  10 #include <sys/types.h>
  11 #include <sys/socket.h>
  12 #include <sys/select.h>
  13 #include <netinet/in.h>
  14 #include <arpa/inet.h>
  15 #include "repo.h"
  16 #include "client.h"
  17
  18 static const char *guess_repo_name(const char *path);
  19 static void sighandler(int s);
  20 static int parse_args(int argc, char **argv);
  21
  22 static const char *repo_name;
  23 static int lis = -1;
  24 static int port = 64357;
  25 static int quit;
  26
  27 static struct client *clients;
  28
  29 const char *repo_path;
  30
  31
  32 int main(int argc, char **argv)
  33 {
  34         struct sockaddr_in addr;
  35
  36         if(parse_args(argc, argv) == -1) {
  37                 return 1;
  38         }
  39
  40         signal(SIGINT, sighandler);
  41         signal(SIGQUIT, sighandler);
  42         signal(SIGILL, sighandler);
  43         signal(SIGSEGV, sighandler);
  44         signal(SIGTERM, sighandler);
  45
  46         if(repo_init(repo_path) == -1) {
  47                 return 1;
  48         }
  49         /* repo_cleanup(); */
  50
  51         if(!repo_name) {
  52                 if(!(repo_name = guess_repo_name(repo_path))) {
  53                         return 1;
  54                 }
  55         }
  56
  57         printf("Serving %s from %s\n", repo_name, repo_path);
  58
  59         if(!(lis = socket(PF_INET, SOCK_STREAM, 0))) {
  60                 fprintf(stderr, "failed to create socket: %s\n", strerror(errno));
  61                 return 1;
  62         }
  63         fcntl(lis, F_SETFL, fcntl(lis, F_GETFL) | O_NONBLOCK);
  64
  65         memset(&addr, 0, sizeof addr);
  66         addr.sin_family = AF_INET;
  67         addr.sin_port = htons(port);
  68         addr.sin_addr.s_addr = INADDR_ANY;
  69
  70         if(bind(lis, (struct sockaddr*)&addr, sizeof addr) == -1) {
  71                 fprintf(stderr, "failed to bind listening socket to port %d\n", port);
  72                 return 1;
  73         }
  74         listen(lis, 8);
  75
  76         for(;;) {
  77                 int res, max_fd, s;
  78                 fd_set rdset;
  79                 struct client *c, dummy;
  80
  81                 FD_SET(lis, &rdset);
  82                 max_fd = lis;
  83
  84                 c = clients;
  85                 while(c) {
  86                         FD_SET(c->s, &rdset);
  87                         if(c->s > max_fd) max_fd = c->s;
  88                         c = c->next;
  89                 }
  90
  91                 if((res = select(max_fd + 1, &rdset, 0, 0, 0)) == -1 && errno != EINTR) {
  92                         perror("select failed");
  93                         break;
  94                 }
  95                 if(quit) break;
  96                 if(res <= 0) continue;
  97
  98                 dummy.next = clients;
  99                 c = &dummy;
 100                 while(c->next) {
 101                         if(FD_ISSET(c->next->s, &rdset)) {
 102                                 if(handle_client(c->next) == -1) {
 103                                         struct client *tmp = c->next;
 104                                         c->next = tmp->next;
 105
 106                                         printf("Client %s disconnected\n", tmp->addr ? tmp->addr : "unknown");
 107                                         close(tmp->s);
 108                                         free(tmp->addr);
 109                                         free(tmp);
 110                                         continue;
 111                                 }
 112                         }
 113                         c = c->next;
 114                 }
 115                 clients = dummy.next;
 116
 117                 if(FD_ISSET(lis, &rdset)) {
 118                         struct sockaddr_in addr;
 119                         unsigned int addrsz = sizeof addr;
 120
 121                         if((s = accept(lis, (struct sockaddr*)&addr, &addrsz)) == -1) {
 122                                 perror("failed to accept connection");
 123                                 continue;
 124                         }
 125                         fcntl(s, F_SETFL, fcntl(s, F_GETFL) | O_NONBLOCK);
 126
 127                         if(!(c = calloc(1, sizeof *c))) {
 128                                 perror("failed to allocate memory for client structure");
 129                                 close(s);
 130                                 continue;
 131                         }
 132                         c->s = s;
 133                         c->next = clients;
 134                         c->addr = strdup(inet_ntoa(addr.sin_addr));
 135                         clients = c;
 136
 137                         send_string(c, "reposerve-0.1 protocol:0\n");
 138
 139                         printf("Connection from: %s\n", c->addr ? c->addr : "unknown");
 140                 }
 141         }
 142
 143         printf("Shutting down\n");
 144         return 0;
 145 }
 146
 147 static const char *guess_repo_name(const char *path)
 148 {
 149         static char pathbuf[PATH_MAX];
 150         char *last_slash;
 151         int len;
 152
 153         if(!realpath(path, pathbuf)) {
 154                 goto fail;
 155         }
 156         len = strlen(pathbuf);
 157
 158         if(len > 0 && pathbuf[len - 1] == '/') {
 159                 pathbuf[--len] = 0;
 160         }
 161         if(len <= 0) goto fail;
 162
 163         if((last_slash = strrchr(pathbuf, '/'))) {
 164                 return last_slash + 1;
 165         }
 166         return pathbuf;
 167
 168 fail:
 169         fprintf(stderr, "failed to resolve path %s while determining the repo name. Please specify an explicit name with -id\n", repo_path);
 170         return 0;
 171 }
 172
 173 static void sighandler(int s)
 174 {
 175         quit = 1;
 176 }
 177
 178 static void print_usage(const char *argv0)
 179 {
 180         printf("Usage: %s [options] [repo path]\n", argv0);
 181         printf("options:\n");
 182         printf("  -id <name>: repo identifier (defaults to directory name)\n");
 183         printf("  -h,-help: print help and exit\n");
 184 }
 185
 186 static int parse_args(int argc, char **argv)
 187 {
 188         int i;
 189
 190         for(i=1; i<argc; i++) {
 191                 if(argv[i][0] == '-') {
 192                         if(strcmp(argv[i], "-id") == 0) {
 193                                 repo_name = argv[++i];
 194                         } else if(strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "-help") == 0) {
 195                                 print_usage(argv[0]);
 196                                 exit(0);
 197                         } else {
 198                                 fprintf(stderr, "invalid option: %s\n", argv[i]);
 199                                 return -1;
 200                         }
 201                 } else {
 202                         if(repo_path) {
 203                                 fprintf(stderr, "unexpected argument: %s\n", argv[i]);
 204                                 return -1;
 205                         }
 206                         repo_path = argv[i];
 207                 }
 208         }
 209
 210         if(!repo_path) repo_path = ".";
 211         return 0;
 212 }