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Annotation of researchv10no/netfs/serv/ex, revision 1.1

1.1     ! root        1: /*
        !             2:  * parse the permission exceptions file
        !             3:  */
        !             4: 
        !             5: #include <rf.h>
        !             6: #include <stdio.h>
        !             7: #include <ctype.h>
        !             8: 
        !             9: extern char *strchr();
        !            10: extern char *malloc(), *realloc();
        !            11: 
        !            12: extern char rootname[];
        !            13: 
        !            14: Namemap *exulist, *exglist;
        !            15: static int exuend, exgend;
        !            16: static int exulim, exglim;
        !            17: 
        !            18: rdexcept(f)
        !            19: FILE *f;
        !            20: {
        !            21:        char line[200];         /* big enough, ignore */
        !            22:        char *typ, *arg;
        !            23: 
        !            24:        while (fgets(line, sizeof(line), f)) {
        !            25:                if (crack(line, &typ, &arg) == 0)
        !            26:                        continue;
        !            27:                if (strcmp(typ, "client") == 0
        !            28:                &&  matchclient(arg)) {
        !            29:                        exclient(f);
        !            30:                        return (1);
        !            31:                }
        !            32:        }
        !            33:        return (0);
        !            34: }
        !            35: 
        !            36: /*
        !            37:  * parse one line from the file
        !            38:  * return 1 if it looks valid, 0 if not
        !            39:  * a valid line has
        !            40:  * at least two blank-separated tokens
        !            41:  * and does not begin with `#'
        !            42:  * the first token is a type,
        !            43:  * the second an argument;
        !            44:  * pointers to be filled in for each are supplied
        !            45:  */
        !            46: crack(line, tp, ap)
        !            47: register char *line;
        !            48: char **tp, **ap;
        !            49: {
        !            50: 
        !            51:        if (line[0] == '#')
        !            52:                return (0);
        !            53:        while (isspace(*line))
        !            54:                line++;
        !            55:        if (line[0] == 0)
        !            56:                return (0);
        !            57:        *tp = line;
        !            58:        while (!isspace(*line))
        !            59:                line++;
        !            60:        if (line[0] == 0)
        !            61:                return (0);
        !            62:        *line++ = 0;
        !            63:        while (isspace(*line))
        !            64:                line++;
        !            65:        if (line[0] == 0)
        !            66:                return (0);
        !            67:        *ap = line;
        !            68:        while (*line)
        !            69:                line++;
        !            70:        if (line[-1] == '\n')
        !            71:                line[-1] = 0;
        !            72:        return (1);
        !            73: }
        !            74: 
        !            75: /*
        !            76:  * is this the client section we want?
        !            77:  * -- take the first match, and no other
        !            78:  */
        !            79: matchclient(cp)
        !            80: char *cp;
        !            81: {
        !            82:        if (strcmp(cp, "*") == 0 || strcmp(cp, rfclient) == 0)
        !            83:                return (1);
        !            84:        return (0);
        !            85: }
        !            86: 
        !            87: /*
        !            88:  * found the right client section;
        !            89:  * stash the info away
        !            90:  * we know that only this client section will be examined,
        !            91:  * so don't worry about the fact that the
        !            92:  * next `client' line in the file may be swallowed
        !            93:  */
        !            94: exclient(f)
        !            95: FILE *f;
        !            96: {
        !            97:        char line[200];         /* again, big enough */
        !            98:        char *typ, *arg;
        !            99: 
        !           100:        while (fgets(line, sizeof(line), f)) {
        !           101:                if (crack(line, &typ, &arg) == 0)
        !           102:                        continue;
        !           103:                if (strcmp(typ, "client") == 0)
        !           104:                        break;          /* end of our section */
        !           105:                else if (strcmp(typ, "param") == 0)
        !           106:                        exparam(arg);
        !           107:                else if (strcmp(typ, "uid") == 0)
        !           108:                        exuid(arg, strchr(arg, '='));
        !           109:                else if (strcmp(typ, "gid") == 0)
        !           110:                        exgid(arg);
        !           111:                else if (strcmp(typ,  "unknownuser") == 0) {
        !           112:                        exuid(RFUNKNOWNUSER, arg);
        !           113:                        rfotherdeny = 1;
        !           114:                } else if (strcmp(typ,  "unknowngroup") == 0) {
        !           115:                } else
        !           116:                        rflog("unexpected except line: %s %s\n", typ, arg);
        !           117:        }
        !           118: }
        !           119: 
        !           120: exparam(par)
        !           121: char *par;
        !           122: {
        !           123:        register char *val;
        !           124: 
        !           125:        if (strcmp(par, "root") == 0)
        !           126:                strcpy(rootname, val);
        !           127:        else if (strcmp(par, "otherok") == 0)
        !           128:                rfotherdeny = (*val != '1');    /* 1 means others OK */
        !           129:        else
        !           130:                rflog("unexpected except param %s=%s\n", par, val);
        !           131: }
        !           132: 
        !           133: exuid(arg, val)
        !           134: char *arg, char *val;
        !           135: {
        !           136:        register Namemap *p;
        !           137: 
        !           138:        if (val == 0)
        !           139:                return;
        !           140:        if (val[0] == '=')
        !           141:                *val++ = 0;
        !           142:        if (exulist == NULL) {
        !           143:                exulim = 10;
        !           144:                if ((exulist = (Namemap *)malloc(exulim*sizeof(Namemap))) == NULL)
        !           145:                        rfpanic("no mem for except uids\n");
        !           146:        }
        !           147:        if (exuend >= exulim - 1) {
        !           148:                exulim += 10;
        !           149:                if ((exulist = (Namemap *)realloc((char *)exulist, exulim*sizeof(Namemap))) == NULL)
        !           150:                        rfpanic("no mem for except uids\n");
        !           151:        }
        !           152:        p = &exulist[exuend++];
        !           153:        strncpy(p->cname, arg, sizeof(p->cname)-1);
        !           154:        p->cname[sizeof(p->cname)-1] = 0;
        !           155:        strncpy(p->sname, val, sizeof(p->sname)-1);
        !           156:        p->sname[sizeof(p->sname)-1] = 0;
        !           157:        p[1].cname[0] = 0;
        !           158: }
        !           159: 
        !           160: exgid(arg)
        !           161: char *arg;
        !           162: {
        !           163:        char *val;
        !           164:        register Namemap *p;
        !           165: 
        !           166:        if ((val = strchr(arg, '=')) == NULL)
        !           167:                return;         /* may be wrong */
        !           168:        *val++ = 0;
        !           169:        if (exglist == NULL) {
        !           170:                exglim = 10;
        !           171:                if ((exglist = (Namemap *)malloc(exglim*sizeof(Namemap))) == NULL)
        !           172:                        rfpanic("no mem for except uids\n");
        !           173:        }
        !           174:        if (exgend >= exglim-1) {
        !           175:                exglim += 10;
        !           176:                if ((exglist = (Namemap *)realloc((char *)exglist, exglim*sizeof(Namemap))) == NULL)
        !           177:                        rfpanic("no mem for except uids\n");
        !           178:        }
        !           179:        p = &exglist[exgend++];
        !           180:        strncpy(p->cname, arg, sizeof(p->cname)-1);
        !           181:        p->cname[sizeof(p->cname)-1] = 0;
        !           182:        strncpy(p->sname, val, sizeof(p->sname)-1);
        !           183:        p->sname[sizeof(p->sname)-1] = 0;
        !           184:        p[1].cname[0] = 0;
        !           185: }

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