dccp_recv.c

   1 #include "para.h"
   2 #include "error.h"
   3 #include "dccp.h"
   4 #include "recv.h"
   5 #include "string.h"
   6 #include "net.h"
   7
   8 #include "dccp_recv.cmdline.h"
   9
  10 /* needed by getaddrinfo */
  11 #include <sys/types.h>
  12 #include <sys/socket.h>
  13 #include <netdb.h>
  14
  15
  16 #define DCCP_BUFSIZE 4096
  17
  18 /**
  19  * data specific to the dccp receiver
  20  *
  21  * \sa receiver receiver_node
  22  */
  23 struct private_dccp_recv_data {
  24         /** the file descriptor for the dccp socket */
  25         int fd;
  26 };
  27
  28
  29 static void dccp_recv_close(struct receiver_node *rn)
  30 {
  31
  32         struct private_dccp_recv_data *pdd = rn->private_data;
  33
  34         if (pdd && pdd->fd > 0)
  35                 close(pdd->fd);
  36         free(rn->buf);
  37         rn->buf = NULL;
  38         free(rn->private_data);
  39         rn->private_data = NULL;
  40 }
  41
  42
  43 static int dccp_recv_open(struct receiver_node *rn)
  44 {
  45         struct private_dccp_recv_data *pdd;
  46         struct gengetopt_args_info *conf = rn->conf;
  47         int ret;
  48         struct addrinfo *ai;
  49         char *tmp;
  50
  51         rn->buf = para_calloc(DCCP_BUFSIZE);
  52         rn->private_data = para_calloc(sizeof(struct private_dccp_recv_data));
  53         pdd = rn->private_data;
  54         ret = dccp_get_socket();
  55         if (ret < 0)
  56                 goto err_out;
  57         pdd->fd = ret;
  58
  59         tmp = make_message("%d", conf->port_arg);
  60         ret = getaddrinfo(conf->host_arg, tmp, NULL, &ai);
  61         free(tmp);
  62         if (ret) {
  63                 ret = -E_ADDR_INFO;
  64                 goto err_out;
  65         }
  66         ret = dccp_set_socket(pdd->fd);
  67         if (ret < 0)
  68                 goto err_out;
  69         PARA_NOTICE_LOG("connecting to %s:%d\n", conf->host_arg, conf->port_arg);
  70         ret = -E_DCCP_CONNECT;
  71         if (connect(pdd->fd, ai->ai_addr, ai->ai_addrlen) < 0)
  72                 goto err_out;
  73         return 1;
  74 err_out:
  75         dccp_recv_close(rn);
  76         return ret;
  77 }
  78
  79 static void dccp_shutdown(void)
  80 {
  81         ; /* nothing to do */
  82 }
  83
  84 static void *dccp_recv_parse_config(int argc, char **argv)
  85 {
  86         struct gengetopt_args_info *tmp = para_calloc(sizeof(struct gengetopt_args_info));
  87
  88         if (!dccp_recv_cmdline_parser(argc, argv, tmp))
  89                 return tmp;
  90         free(tmp);
  91         return NULL;
  92 }
  93
  94 static int dccp_recv_pre_select(struct receiver_node *rn, fd_set *rfds,
  95                 __unused fd_set *wfds, __unused struct timeval *timeout)
  96 {
  97         struct private_dccp_recv_data *pdd = rn->private_data;
  98
  99         if (pdd)
 100                 FD_SET(pdd->fd, rfds);
 101         return pdd->fd;
 102 }
 103
 104 static int dccp_recv_post_select(struct receiver_node *rn, int select_ret,
 105                 fd_set *rfds, __unused fd_set *wfds)
 106 {
 107         int ret;
 108         struct private_dccp_recv_data *pdd = rn->private_data;
 109
 110         if (!select_ret || !pdd || !FD_ISSET(pdd->fd, rfds))
 111                 return 1; /* nothing to do */
 112         if (rn->loaded >= DCCP_BUFSIZE)
 113                 return -E_DCCP_OVERRUN;
 114         ret = recv_bin_buffer(pdd->fd, rn->buf + rn->loaded,
 115                 DCCP_BUFSIZE - rn->loaded);
 116         if (ret <= 0)
 117                 return ret;
 118         rn->loaded += ret;
 119         return 1;
 120 }
 121
 122 /**
 123  * the init function of the dccp receiver
 124  *
 125  * \param r pointer to the receiver struct to initialize
 126  *
 127  * Initialize all function pointers of \a r
 128  */
 129 void dccp_recv_init(struct receiver *r)
 130 {
 131         r->shutdown = dccp_shutdown;
 132         r->open = dccp_recv_open;
 133         r->close = dccp_recv_close;
 134         r->pre_select = dccp_recv_pre_select;
 135         r->post_select = dccp_recv_post_select;
 136         r->parse_config = dccp_recv_parse_config;
 137 }