diplodocus.org Git - nmh/blob - sbr/client.c

   1
   2 /*
   3  * client.c -- connect to a server
   4  *
   5  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  */
   9
  10 #include <h/mh.h>
  11 #include <h/mts.h>
  12 #include <h/utils.h>
  13 #include <errno.h>
  14 #include <sys/socket.h>
  15 #include <netinet/in.h>
  16 #include <netdb.h>
  17 #include <arpa/inet.h>
  18
  19 #define MAXARGS   1000
  20
  21 /*
  22  * static prototypes
  23  */
  24
  25 /* client's own static version of several nmh subroutines */
  26 static char **client_brkstring (char *, char *, char *);
  27 static int client_brkany (char, char *);
  28 static char **client_copyip (char **, char **, int);
  29 static char *client_getcpy (char *);
  30 static void client_freelist(char **);
  31
  32
  33 int
  34 client (char *args, char *service, char *response, int len_response, int debug)
  35 {
  36     int sd, rc;
  37     char **ap, *arguments[MAXARGS];
  38     struct addrinfo hints, *res, *ai;
  39
  40     ap = arguments;
  41     if (args != NULL && *args != 0) {
  42         ap = client_copyip (client_brkstring (client_getcpy (args), " ", "\n"),
  43                 ap, MAXARGS);
  44     } else {
  45         if (servers != NULL && *servers != 0)
  46             ap = client_copyip (client_brkstring (client_getcpy (servers), " ", "\n"),
  47                 ap, MAXARGS);
  48     }
  49     if (ap == arguments) {
  50         *ap++ = client_getcpy ("localhost");
  51         *ap = NULL;
  52     }
  53
  54     memset(&hints, 0, sizeof(hints));
  55 #ifdef AI_ADDRCONFIG
  56     hints.ai_flags = AI_ADDRCONFIG;
  57 #endif
  58     hints.ai_family = PF_UNSPEC;
  59     hints.ai_socktype = SOCK_STREAM;
  60
  61     for (ap = arguments; *ap; ap++) {
  62
  63         if (debug) {
  64             fprintf(stderr, "Trying to connect to \"%s\" ...\n", *ap);
  65         }
  66
  67         rc = getaddrinfo(*ap, service, &hints, &res);
  68
  69         if (rc) {
  70             if (debug) {
  71                 fprintf(stderr, "Lookup of \"%s\" failed: %s\n", *ap,
  72                         gai_strerror(rc));
  73             }
  74             continue;
  75         }
  76
  77         for (ai = res; ai != NULL; ai = ai->ai_next) {
  78             if (debug) {
  79                 char address[NI_MAXHOST];
  80
  81                 rc = getnameinfo(ai->ai_addr, ai->ai_addrlen, address,
  82                                  sizeof(address), NULL, 0, NI_NUMERICHOST);
  83
  84                 fprintf(stderr, "Connecting to %s...\n",
  85                         rc ? "unknown" : address);
  86             }
  87
  88             sd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
  89
  90             if (sd < 0) {
  91                 if (debug)
  92                     fprintf(stderr, "socket() failed: %s\n", strerror(errno));
  93                 continue;
  94             }
  95
  96             if (connect(sd, ai->ai_addr, ai->ai_addrlen) == 0) {
  97                 freeaddrinfo(res);
  98                 client_freelist(ap);
  99                 return sd;
 100             }
 101
 102             if (debug) {
 103                 fprintf(stderr, "Connection failed: %s\n", strerror(errno));
 104             }
 105
 106             close(sd);
 107         }
 108
 109         freeaddrinfo(res);
 110     }
 111
 112     client_freelist(ap);
 113     strncpy (response, "no servers available", len_response);
 114     return NOTOK;
 115 }
 116
 117
 118 /*
 119  * Free a list of strings
 120  */
 121
 122 static void
 123 client_freelist(char **list)
 124 {
 125     while (*list++ != NULL)
 126         free(*list);
 127 }
 128
 129
 130 /*
 131  * static copies of three nmh subroutines
 132  */
 133
 134 static char *broken[MAXARGS + 1];
 135
 136 static char **
 137 client_brkstring (char *strg, char *brksep, char *brkterm)
 138 {
 139     register int bi;
 140     register char c, *sp;
 141
 142     sp = strg;
 143
 144     for (bi = 0; bi < MAXARGS; bi++) {
 145         while (client_brkany (c = *sp, brksep))
 146             *sp++ = 0;
 147         if (!c || client_brkany (c, brkterm)) {
 148             *sp = 0;
 149             broken[bi] = 0;
 150             return broken;
 151         }
 152
 153         broken[bi] = sp;
 154         while ((c = *++sp) && !client_brkany (c, brksep) && !client_brkany (c, brkterm))
 155             continue;
 156     }
 157     broken[MAXARGS] = 0;
 158
 159     return broken;
 160 }
 161
 162
 163 /*
 164  * returns 1 if chr in strg, 0 otherwise
 165  */
 166 static int
 167 client_brkany (char chr, char *strg)
 168 {
 169     register char *sp;
 170
 171     if (strg)
 172         for (sp = strg; *sp; sp++)
 173             if (chr == *sp)
 174                 return 1;
 175     return 0;
 176 }
 177
 178
 179 /*
 180  * copy a string array and return pointer to end
 181  */
 182 static char **
 183 client_copyip (char **p, char **q, int len_q)
 184 {
 185     while (*p && --len_q > 0)
 186         *q++ = *p++;
 187
 188     *q = NULL;
 189
 190     return q;
 191 }
 192
 193
 194 static char *
 195 client_getcpy (char *str)
 196 {
 197     char *cp;
 198     size_t len;
 199
 200     len = strlen(str) + 1;
 201     cp = mh_xmalloc(len);
 202
 203     memcpy (cp, str, len);
 204     return cp;
 205 }
 206