# Arthur de Jong

Open Source / Free Software developer

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path: root/nss/common.h
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 ```1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 ``` ``````/* common.h - common functions for NSS lookups Copyright (C) 2006 West Consulting Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Arthur de Jong This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef NSS__COMMON_H #define NSS__COMMON_H 1 #include #include #include "nslcd.h" #include "common/nslcd-prot.h" #include "compat/attrs.h" #include "compat/nss_compat.h" #ifdef NSS_FLAVOUR_SOLARIS #include "solnss.h" #endif /* NSS_FLAVOUR_SOLARIS */ /* These are macros for handling read and write problems, they are NSS specific due to the return code so are defined here. They genrally close the open file, set an error code and return with an error status. */ /* Macro is called to handle errors in opening a client connection. */ #define ERROR_OUT_OPENERROR \ *errnop=ENOENT; \ return (errno==EAGAIN)?NSS_STATUS_TRYAGAIN:NSS_STATUS_UNAVAIL; /* Macro is called to handle errors on read operations. */ #define ERROR_OUT_READERROR(fp) \ (void)tio_close(fp); \ fp=NULL; \ *errnop=ENOENT; \ return NSS_STATUS_UNAVAIL; /* Macro is called to handle problems with too small a buffer. This triggers the caller to call the function with a larger buffer (see NSS_GETENT below). */ #define ERROR_OUT_BUFERROR(fp) \ *errnop=ERANGE; \ return NSS_STATUS_TRYAGAIN; /* This macro is called if there was a problem with a write operation. */ #define ERROR_OUT_WRITEERROR(fp) \ ERROR_OUT_READERROR(fp) /* This macro is called if the read status code is not NSLCD_RESULT_BEGIN. */ #define ERROR_OUT_NOSUCCESS(fp) \ (void)tio_close(fp); \ fp=NULL; \ return NSS_STATUS_NOTFOUND; /* These are some general macros that are used to build parts of the genral macros below. */ /* check to see if we should answer NSS requests */ #define NSS_AVAILCHECK \ if (!_nss_ldap_enablelookups) \ return NSS_STATUS_UNAVAIL; #ifdef NSS_FLAVOUR_GLIBC /* extra definitions we need (nothing for Glibc) */ #define NSS_EXTRA_DEFS ; /* check validity of passed buffer (Glibc flavour) */ #define NSS_BUFCHECK \ if (buffer==NULL) \ { \ *errnop=EINVAL; \ return NSS_STATUS_UNAVAIL; \ } \ if (buflen==0) \ { \ *errnop=ERANGE; \ return NSS_STATUS_TRYAGAIN; \ } #endif /* NSS_FLAVOUR_GLIBC */ /* The following macros to automatically generate get..byname(), get..bynumber(), setent(), getent() and endent() function bodies. These functions have very common code so this can easily be reused. */ /* This is a generic get..by..() generation macro. The action parameter is the NSLCD_ACTION_.. action, the writefn is the operation for writing the parameters and readfn is the function name for reading a single result entry. The function is assumed to have result, buffer, buflen and errnop parameters that define the result structure, the user buffer with length and the errno to return. This macro should be called through some of the customized ones below. */ #define NSS_BYGEN(action,writefn,readfn) \ TFILE *fp; \ int32_t tmpint32; \ nss_status_t retv; \ NSS_EXTRA_DEFS; \ NSS_AVAILCHECK; \ NSS_BUFCHECK; \ /* open socket and write request */ \ NSLCD_REQUEST(fp,action,writefn); \ /* read response */ \ READ_RESPONSE_CODE(fp); \ retv=readfn; \ /* close socket and we're done */ \ if ((retv==NSS_STATUS_SUCCESS)||(retv==NSS_STATUS_TRYAGAIN)) \ { \ (void)tio_skipall(fp); \ (void)tio_close(fp); \ } \ return retv; /* This macro can be used to generate a get..byname() function body. */ #define NSS_BYNAME(action,name,readfn) \ NSS_BYGEN(action,WRITE_STRING(fp,name),readfn) /* This macro can be used to generate a get..by..() function body where the value that is the key has the specified type. */ #define NSS_BYTYPE(action,val,type,readfn) \ NSS_BYGEN(action,WRITE_TYPE(fp,val,type),readfn) /* This macro can be used to generate a get..by..() function body where the value should be passed as an int32_t. */ #define NSS_BYINT32(action,val,readfn) \ NSS_BYGEN(action,WRITE_INT32(fp,val),readfn) /* This macro generates a simple setent() function body. This closes any open streams so that NSS_GETENT() can open a new file. */ #define NSS_SETENT(fp) \ NSS_AVAILCHECK; \ if (fp!=NULL) \ { \ (void)tio_close(fp); \ fp=NULL; \ } \ return NSS_STATUS_SUCCESS; /* This macro generates a getent() function body. If the stream is not yet open, a new one is opened, a request is written and a check is done for a response header. A single entry is read with the readfn() function. */ #define NSS_GETENT(fp,action,readfn) \ int32_t tmpint32; \ nss_status_t retv; \ NSS_EXTRA_DEFS; \ NSS_AVAILCHECK; \ NSS_BUFCHECK; \ /* check that we have a valid file descriptor */ \ if (fp==NULL) \ { \ /* open a new stream and write the request */ \ NSLCD_REQUEST(fp,action,/* no writefn */;); \ } \ /* prepare for buffer errors */ \ tio_mark(fp); \ /* read a response */ \ READ_RESPONSE_CODE(fp); \ retv=readfn; \ /* check read result */ \ if (retv==NSS_STATUS_TRYAGAIN) \ { \ /* if we have a full buffer try to reset the stream */ \ if (tio_reset(fp)) \ { \ /* reset failed, we close and give up with a permanent error \ because we cannot retry just the getent() call because it \ may not be only the first entry that failed */ \ tio_close(fp); \ fp=NULL; \ *errnop=EINVAL; \ return NSS_STATUS_UNAVAIL; \ } \ } \ else if (retv!=NSS_STATUS_SUCCESS) \ fp=NULL; /* file should be closed by now */ \ return retv; /* This macro generates an endent() function body. This just closes the stream. */ #define NSS_ENDENT(fp) \ NSS_AVAILCHECK; \ if (fp!=NULL) \ { \ (void)tio_skipall(fp); \ (void)tio_close(fp); \ fp=NULL; \ } \ return NSS_STATUS_SUCCESS; #endif /* not NSS__COMMON_H */ ``````