diff options
Diffstat (limited to 'hesiod/hesiod.c')
| -rw-r--r-- | hesiod/hesiod.c | 195 |
1 files changed, 100 insertions, 95 deletions
diff --git a/hesiod/hesiod.c b/hesiod/hesiod.c index 46ae9a988c..ffae611fe2 100644 --- a/hesiod/hesiod.c +++ b/hesiod/hesiod.c @@ -58,47 +58,48 @@ static const char rcsid[] = "$Id$"; /* A few operating systems don't define these. */ #ifndef C_HS -#define C_HS 4 +# define C_HS 4 #endif #ifndef T_TXT -#define T_TXT 16 +# define T_TXT 16 #endif -static int read_config_file(struct hesiod_p *ctx, const char *filename); -static char **get_txt_records(struct hesiod_p *ctx, int class, - const char *name); +static int read_config_file (struct hesiod_p *ctx, const char *filename); +static char **get_txt_records (struct hesiod_p *ctx, int class, + const char *name); #ifdef _LIBC # define cistrcmp(s1, s2) strcasecmp (s1, s2) #else -static int cistrcmp(const char *s1, const char *s2); +static int cistrcmp (const char *s1, const char *s2); #endif /* This function is called to initialize a hesiod_p. */ -int hesiod_init(void **context) +int +hesiod_init (void **context) { struct hesiod_p *ctx; const char *p, *configname; - ctx = malloc(sizeof(struct hesiod_p)); + ctx = malloc (sizeof (struct hesiod_p)); if (ctx) { *context = ctx; - configname = __secure_getenv("HESIOD_CONFIG"); + configname = __secure_getenv ("HESIOD_CONFIG"); if (!configname) configname = SYSCONFDIR "/hesiod.conf"; - if (read_config_file(ctx, configname) >= 0) + if (read_config_file (ctx, configname) >= 0) { /* The default rhs can be overridden by an environment variable. */ - p = __secure_getenv("HES_DOMAIN"); + p = __secure_getenv ("HES_DOMAIN"); if (p) { if (ctx->rhs) - free(ctx->rhs); - ctx->rhs = malloc(strlen(p) + 2); + free (ctx->rhs); + ctx->rhs = malloc (strlen (p) + 2); if (ctx->rhs) { *ctx->rhs = '.'; - strcpy(ctx->rhs + 1, (*p == '.') ? p + 1 : p); + strcpy (ctx->rhs + 1, (*p == '.') ? p + 1 : p); return 0; } else @@ -112,47 +113,49 @@ int hesiod_init(void **context) __set_errno (ENOMEM); if (ctx->lhs) - free(ctx->lhs); + free (ctx->lhs); if (ctx->rhs) - free(ctx->rhs); + free (ctx->rhs); if (ctx) - free(ctx); + free (ctx); return -1; } /* This function deallocates the hesiod_p. */ -void hesiod_end(void *context) +void +hesiod_end (void *context) { struct hesiod_p *ctx = (struct hesiod_p *) context; - free(ctx->rhs); + free (ctx->rhs); if (ctx->lhs) - free(ctx->lhs); - free(ctx); + free (ctx->lhs); + free (ctx); } /* This function takes a hesiod (name, type) and returns a DNS * name which is to be resolved. */ -char *hesiod_to_bind(void *context, const char *name, const char *type) +char * +hesiod_to_bind (void *context, const char *name, const char *type) { struct hesiod_p *ctx = (struct hesiod_p *) context; char bindname[MAXDNAME], *p, *endp, *ret, **rhs_list = NULL; const char *rhs; size_t len; - endp = stpcpy(bindname, name); + endp = stpcpy (bindname, name); /* Find the right right hand side to use, possibly truncating bindname. */ - p = strchr(bindname, '@'); + p = strchr (bindname, '@'); if (p) { *p++ = 0; - if (strchr(p, '.')) + if (strchr (p, '.')) rhs = name + (p - bindname); else { - rhs_list = hesiod_resolve(context, p, "rhs-extension"); + rhs_list = hesiod_resolve (context, p, "rhs-extension"); if (rhs_list) rhs = *rhs_list; else @@ -161,82 +164,85 @@ char *hesiod_to_bind(void *context, const char *name, const char *type) return NULL; } } - } else - rhs = ctx->rhs; + } + else + rhs = ctx->rhs; /* See if we have enough room. */ - len = (endp - bindname) + 1 + strlen(type); + len = (endp - bindname) + 1 + strlen (type); if (ctx->lhs) - len += strlen(ctx->lhs) + ((ctx->lhs[0] != '.') ? 1 : 0); - len += strlen(rhs) + ((rhs[0] != '.') ? 1 : 0); - if (len > sizeof(bindname) - 1) + len += strlen (ctx->lhs) + ((ctx->lhs[0] != '.') ? 1 : 0); + len += strlen (rhs) + ((rhs[0] != '.') ? 1 : 0); + if (len > sizeof (bindname) - 1) { if (rhs_list) - hesiod_free_list(context, rhs_list); + hesiod_free_list (context, rhs_list); __set_errno (EMSGSIZE); return NULL; } /* Put together the rest of the domain. */ - endp = __stpcpy (__stpcpy (endp, "."), type); + endp = stpcpy (stpcpy (endp, "."), type); if (ctx->lhs) { if (ctx->lhs[0] != '.') - endp = __stpcpy (endp, "."); - endp = __stpcpy (endp, ctx->lhs); + endp = stpcpy (endp, "."); + endp = stpcpy (endp, ctx->lhs); } if (rhs[0] != '.') - endp = __stpcpy (endp, "."); - endp = __stpcpy (endp, rhs); + endp = stpcpy (endp, "."); + endp = stpcpy (endp, rhs); /* rhs_list is no longer needed, since we're done with rhs. */ if (rhs_list) - hesiod_free_list(context, rhs_list); + hesiod_free_list (context, rhs_list); /* Make a copy of the result and return it to the caller. */ - ret = malloc((endp - bindname) + 1); + ret = malloc ((endp - bindname) + 1); if (!ret) { __set_errno (ENOMEM); return NULL; } - strcpy(ret, bindname); - return ret; + return strcpy (ret, bindname); } /* This is the core function. Given a hesiod name and type, it * returns an array of strings returned by the resolver. */ -char **hesiod_resolve(void *context, const char *name, const char *type) +char ** +hesiod_resolve (void *context, const char *name, const char *type) { struct hesiod_p *ctx = (struct hesiod_p *) context; char *bindname, **retvec; - bindname = hesiod_to_bind(context, name, type); - if (!bindname) + bindname = hesiod_to_bind (context, name, type); + if (bindname == NULL) return NULL; retvec = get_txt_records(ctx, ctx->classes[0], bindname); if (retvec == NULL && errno == ENOENT && ctx->classes[1]) - retvec = get_txt_records(ctx, ctx->classes[1], bindname); + retvec = get_txt_records (ctx, ctx->classes[1], bindname); - free(bindname); + free (bindname); return retvec; } -void hesiod_free_list(void *context, char **list) +void +hesiod_free_list (void *context, char **list) { char **p; for (p = list; *p; p++) - free(*p); - free(list); + free (*p); + free (list); } /* This function parses the /etc/hesiod.conf file. Returns 0 on success, * -1 on failure. On failure, it might leave values in ctx->lhs or * ctx->rhs which need to be freed by the caller. */ -static int read_config_file(struct hesiod_p *ctx, const char *filename) +static int +read_config_file (struct hesiod_p *ctx, const char *filename) { char *key, *data, *p, **which; char buf[MAXDNAME + 7]; @@ -248,16 +254,16 @@ static int read_config_file(struct hesiod_p *ctx, const char *filename) ctx->classes[1] = C_HS; /* Try to open the configuration file. */ - fp = fopen(filename, "r"); - if (!fp) + fp = fopen (filename, "r"); + if (fp = NULL) { /* Use compiled in default domain names. */ - ctx->lhs = malloc(strlen(DEF_LHS) + 1); - ctx->rhs = malloc(strlen(DEF_RHS) + 1); + ctx->lhs = malloc (strlen (DEF_LHS) + 1); + ctx->rhs = malloc (strlen (DEF_RHS) + 1); if (ctx->lhs && ctx->rhs) { - strcpy(ctx->lhs, DEF_LHS); - strcpy(ctx->rhs, DEF_RHS); + strcpy (ctx->lhs, DEF_LHS); + strcpy (ctx->rhs, DEF_RHS); return 0; } else @@ -269,49 +275,48 @@ static int read_config_file(struct hesiod_p *ctx, const char *filename) ctx->lhs = NULL; ctx->rhs = NULL; - while (fgets(buf, sizeof(buf), fp) != NULL) + while (fgets (buf, sizeof (buf), fp) != NULL) { p = buf; if (*p == '#' || *p == '\n' || *p == '\r') continue; - while(*p == ' ' || *p == '\t') - p++; + while (*p == ' ' || *p == '\t') + ++p; key = p; while(*p != ' ' && *p != '\t' && *p != '=') - p++; + ++p; *p++ = 0; - while(isspace(*p) || *p == '=') - p++; + while (isspace (*p) || *p == '=') + ++p; data = p; - while(!isspace(*p)) - p++; + while (!isspace (*p)) + ++p; *p = 0; - if (cistrcmp(key, "lhs") == 0 || cistrcmp(key, "rhs") == 0) + if (cistrcmp (key, "lhs") == 0 || cistrcmp (key, "rhs") == 0) { - which = (strcmp(key, "lhs") == 0) ? &ctx->lhs : &ctx->rhs; - *which = malloc(strlen(data) + 1); + which = (strcmp (key, "lhs") == 0) ? &ctx->lhs : &ctx->rhs; + *which = strdup (data); if (!*which) { __set_errno (ENOMEM); return -1; } - strcpy(*which, data); } - else if (cistrcmp(key, "classes") == 0) + else if (cistrcmp (key, "classes") == 0) { n = 0; while (*data && n < 2) { p = data; while (*p && *p != ',') - p++; + ++p; if (*p) *p++ = 0; - if (cistrcmp(data, "IN") == 0) + if (cistrcmp (data, "IN") == 0) ctx->classes[n++] = C_IN; - else if (cistrcmp(data, "HS") == 0) + else if (cistrcmp (data, "HS") == 0) ctx->classes[n++] = C_HS; data = p; } @@ -319,7 +324,7 @@ static int read_config_file(struct hesiod_p *ctx, const char *filename) ctx->classes[n++] = 0; } } - fclose(fp); + fclose (fp); if (!ctx->rhs || ctx->classes[0] == 0 || ctx->classes[0] == ctx->classes[1]) { @@ -333,8 +338,8 @@ static int read_config_file(struct hesiod_p *ctx, const char *filename) /* Given a DNS class and a DNS name, do a lookup for TXT records, and * return a list of them. */ -static char **get_txt_records(struct hesiod_p *ctx, int qclass, - const char *name) +static char ** +get_txt_records (struct hesiod_p *ctx, int qclass, const char *name) { HEADER *hp; unsigned char qbuf[PACKETSZ], abuf[MAX_HESRESP], *p, *eom, *eor; @@ -342,17 +347,17 @@ static char **get_txt_records(struct hesiod_p *ctx, int qclass, int ancount, qdcount, i, j, n, skip, type, class, len; /* Make sure the resolver is initialized. */ - if ((_res.options & RES_INIT) == 0 && res_init() == -1) + if ((_res.options & RES_INIT) == 0 && res_init () == -1) return NULL; /* Construct the query. */ - n = res_mkquery(QUERY, name, qclass, T_TXT, NULL, 0, - NULL, qbuf, PACKETSZ); + n = res_mkquery (QUERY, name, qclass, T_TXT, NULL, 0, + NULL, qbuf, PACKETSZ); if (n < 0) return NULL; /* Send the query. */ - n = res_send(qbuf, n, abuf, MAX_HESRESP); + n = res_send (qbuf, n, abuf, MAX_HESRESP); if (n < 0) { __set_errno (ECONNREFUSED); @@ -361,15 +366,15 @@ static char **get_txt_records(struct hesiod_p *ctx, int qclass, /* Parse the header of the result. */ hp = (HEADER *) abuf; - ancount = ntohs(hp->ancount); - qdcount = ntohs(hp->qdcount); - p = abuf + sizeof(HEADER); + ancount = ntohs (hp->ancount); + qdcount = ntohs (hp->qdcount); + p = abuf + sizeof (HEADER); eom = abuf + n; /* Skip questions, trying to get to the answer section which follows. */ - for (i = 0; i < qdcount; i++) + for (i = 0; i < qdcount; ++i) { - skip = dn_skipname(p, eom); + skip = dn_skipname (p, eom); if (skip < 0 || p + skip + QFIXEDSZ > eom) { __set_errno (EMSGSIZE); @@ -379,8 +384,8 @@ static char **get_txt_records(struct hesiod_p *ctx, int qclass, } /* Allocate space for the text record answers. */ - list = malloc((ancount + 1) * sizeof(char *)); - if (!list) + list = malloc ((ancount + 1) * sizeof(char *)); + if (list == NULL) { __set_errno (ENOMEM); return NULL; @@ -391,7 +396,7 @@ static char **get_txt_records(struct hesiod_p *ctx, int qclass, for (i = 0; i < ancount; i++) { /* Parse the header of this answer. */ - skip = dn_skipname(p, eom); + skip = dn_skipname (p, eom); if (skip < 0 || p + skip + 10 > eom) break; type = p[skip + 0] << 8 | p[skip + 1]; @@ -412,7 +417,7 @@ static char **get_txt_records(struct hesiod_p *ctx, int qclass, } /* Allocate space for this answer. */ - list[j] = malloc(len); + list[j] = malloc (len); if (!list[j]) { __set_errno (ENOMEM); @@ -430,9 +435,8 @@ static char **get_txt_records(struct hesiod_p *ctx, int qclass, __set_errno (EMSGSIZE); break; } - memcpy(dst, p, n); + dst = mempcpy (dst, p, n); p += n; - dst += n; } if (p < eor) { @@ -446,15 +450,15 @@ static char **get_txt_records(struct hesiod_p *ctx, int qclass, if (i < ancount) { for (i = 0; i < j; i++) - free(list[i]); - free(list); + free (list[i]); + free (list); return NULL; } if (j == 0) { __set_errno (ENOENT); - free(list); + free (list); return NULL; } @@ -463,7 +467,8 @@ static char **get_txt_records(struct hesiod_p *ctx, int qclass, } #ifndef _LIBC -static int cistrcmp(const char *s1, const char *s2) +static int +cistrcmp (const char *s1, const char *s2) { while (*s1 && tolower(*s1) == tolower(*s2)) { |