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annotate packages/net/common/current/src/getserv.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
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children 9f49ba9afe89
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1 //==========================================================================
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2 //
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3 // lib/getserv.c
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4 //
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5 // getservbyname(), getservbyport()
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6 //
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7 //==========================================================================
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8 //####BSDCOPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 //
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12 // Portions of this software may have been derived from OpenBSD or other sources,
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13 // and are covered by the appropriate copyright disclaimers included herein.
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14 //
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15 // -------------------------------------------
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16 //
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17 //####BSDCOPYRIGHTEND####
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18 //==========================================================================
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19 //#####DESCRIPTIONBEGIN####
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20 //
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21 // Author(s): gthomas
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22 // Contributors: gthomas
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23 // Date: 2000-01-10
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24 // Purpose:
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25 // Description:
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26 //
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27 //
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28 //####DESCRIPTIONEND####
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29 //
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30 //==========================================================================
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31
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32
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33 #include <sys/param.h>
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34 #include <netdb.h>
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35
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36 // These must return the port in network byte order.
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37 //
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38 // This means treated as a short, because it's a port, despite the types in
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39 // the API and the struct being ints.
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40 //
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41 // The argument to getservbyport() is also network byte order, so that code
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42 // must change to flip before comparing.
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43
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44 static struct servent services[] = {
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45 { "ftp", 0, 21 , "tcp" },
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46 { "ftp-data", 0, 20 , "tcp" },
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47 { "domain", 0, 53 , "udp" },
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48 { "tftp", 0, 69 , "udp" },
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49 { "snmp", 0, 161 , "udp" },
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50
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51 { NULL, 0, 0 , NULL }
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52 };
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53
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54 // Note that this contains no interlocking between clients of the
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55 // interface; but this is completely typical of such APIs.
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56
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57 static struct servent *
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58 setreturned( struct servent *p )
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59 {
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60 static struct servent returned;
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61
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62 returned.s_name = p->s_name;
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63 returned.s_aliases = p->s_aliases;
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64 returned.s_port = htons(p->s_port); // return in net order
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65 returned.s_proto = p->s_proto;
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66 return &returned;
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67 }
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68
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69 struct servent *
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70 getservbyname(const char *name, const char *proto)
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71 {
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72 struct servent *p = services;
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73 while (p->s_name) {
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74 if ((strcmp(name, p->s_name) == 0) &&
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75 (strcmp(proto, p->s_proto) == 0)) {
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76 return setreturned(p);
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77 }
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78 p++;
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79 }
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80 errno = ENOENT;
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81 return (struct servent *)0;
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82 }
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83
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84 struct servent *
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85 getservbyport(const int num, const char *proto)
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86 {
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87 struct servent *p = services;
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88 int port = ntohs(num);
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89 while (p->s_name) {
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90 if ((p->s_port == port) &&
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91 (strcmp(proto, p->s_proto) == 0)) {
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92 return setreturned(p);
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93 }
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94 p++;
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95 }
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96 errno = ENOENT;
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97 return (struct servent *)0;
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98 }